Table of conTenTsV. 54, 1-6, 2019

Synthesis and characterization of limited mixed sodium manganese - sodium copper sulfate dihydrates with a kröhnkite-type structure and their anhydrous analoguesDelyana Marinova, Mitko Georgiev, Tsvetelina Bancheva, Donka Stoilova...............................................................3

Kinetic study of the oxidation of thiosulphate by hexacyanoferrate(iii) in water pools of cetyl trimethyl ammonium bromide reverse micellesVenkata Nagalakshmi Kilana, Shyamala Pulipaka, Venkata Subba Rao Pulugurtha.......................................................17

A highly effectual protocol for the production of triazolo[1,2-a]indazole-triones and 2h-indazolo[2,1-b]phthalazine-triones using 1,3-disulfonic acid imidazolium hydrogen sulfate as a dual-functional catalystFatemeh Masihpour, Abdolkarim Zare, Maria Merajoddin, Alireza hasaninejad...............................................................23

investigation on the kinetics of coated paper thermal aging Dimitrina Todorova, Veska Lasheva, Greta Radeva, Radostina Cenkova.........................................................................30

Statistical features of epoxy resin based hybrid composites reinforced with jute, banana and flax natural fibersNarendiranath Babu T., R.V. Mangalaraja, T. Manvel Raj, D. Rama Prabha............................................................35

Investigation of pyrolysis and flammability processes of vinyl acetate copolymer paintsMаlik N. Abdikarimov, Raushan Kh. Turgumbayeva, Daulet T. Sartayev.................................................................48

Fire behaviour assessment of rigid polyurethane foams containıng nanoclay and intumescent flame retardant based on cone calorimeter testsBilal Aydoğan, Nazım Usta..............................................................................................................................................55

ignition time of selected ceiling materials and escape temperature time prediction of fire fighter rescue missionDirisu Joseph Osekhoghene, Oyedepo Sunday Olayinka, Fayomi Ojo Sunday isaac, Okokpujie imhade Princess.........................................................................................................................................64

The development of inhibitors of scale formation in water circulation systems in industry, power and municipal householdsTatiana Overchenko, Svitlana Frolenkova, Victoria Vorobyova.................................................................................72

Characterization and colour removal from an aqueous solution using bio-coagulants: response surface methodological approach Okechukwu Dominic Onukwuli, ifeoma Amaoge Obiora-Okafo, Monday Omotioma................................................77

Kinetic and thermodynamic study of the reaction between Bromocresol green with sodium hydroxide in an aqueous solutionLatona Dayo Felix, Adejoro Ajibade.........................................................................................................................90

Adsorption of a dye (crystal violet) on an acid modified non-conventional adsorbentOguanobi Nonso Collins, Onu Chijioke Elijah, Onukwuli Okechukwu D......................................................................95

The usage of Ricinus communis as a natural adsorbent for removal of dyes from an aqueous solutionAkshay Mahajan, Vipan Kumar Sohpal, Vijay Kumar Bulasara..................................................................................111

Modification of an industrial crude oil desalting unit by electric mixing to improve the dehydration efficiencyForough hosseinpour, Sattar Ghader, Mohammad Reza Rahimpour, hamidreza Bagheri.....................................124

IssUe 1

Journal of Chemical Technology and Metallurgy

Response surface modeling of compressive strength of high-performance concrete formulated by a high water reducing and setting accelerating superplasticizer. Box-Behnken experimental designMohammed hussein Khudhair, Ahmed Mohammed Al-Anweh, Majeed hazza Nomaan, Mohamed Berradi, Rachid Hsissoua, Atigah Bekhta, Mohamed Salahdine Elyoubi, Ahmaed Elharfi...................................................................135

The surface charge of unsupported nano-structured titania ceramic membrane top layers with varying calcination temperatures İlker Erdem, Muhsin Çiftçioğlu...............................................................................................................................145

Statistical evaluation and forecasting of the dust particles concentrations depending on the meteorological conditionsMarko I. Uzunov, Dimitar I. Pilev, Evgenia M. Savova-Videnova............................................................................149

Dependence of the magnetic properties of alloyed Co-Ni, Co-Sn, Ni-Sn nanopowders on the elemental compositionsivania N. Markova, Milena T. Georgieva, Mehmet B. Piskin, Dimitar V. Tzankov, Rositca V. Gavrilova, Boyan i. Yordanov, ivan i. Zahariev.............................................................................................163

Synthesis of zirconia/magnesia composite coating on AZ91 magnesıum alloyEkin Selvi, Faiz Muhaffel, Murat Baydoğan..............................................................................................................179

Dispergation of aluminum powder (aluminum flakes) in silicon enamel in presence of TroysperseTM 98C additive Vitaliy Y. Tyukanko, Antonina N. Duryagina, Kirill A. Ostrovnoy, Oleg Petukhov, Kristina V. Makievskaya..........185

Extraction of lithium from wastes generated in titanium productionOmirserik Baigenzhenov, Weiwei Wang, Assel Dagubayeva, Yerbol Zhaksylykuly Shabanov.................................193

Application of calcium hydrocarboaluminate for the production of coarse-graded aluminaEkaterina Viktorovna Siziakova, Pavel Vladimirovich ivanov, Aleksey Viktorovich Boik.....................................200

Cooling condition effects on transformation temperature and microstructure of Cu81Al13Ni4Ti2 SMAFethi Dagdelen, M.Sait Kanca, Mustafa Boyrazli....................................................................................................204

Potentiodynamic polarization and gravimetric evaluation of corrosion of copper in 2M h2SO4 in absence and presence of ammonium dichromate as an inhibitorCleophas Akintoye Loto, Ojo Sunday isaac Fayomi, Roland Tolulope Loto, Abimbola Patricia idowu Popoola.....209

Modeling and optimization of the inhibition efficiency of Euphorbia heterophylla extracts based corrosion inhibitor оf mild steel corrosion in hCl media using а response surface methodologyOdejobi Oludare J., Akinbulumo Olatunde A............................................................................................................217

Technology of heat treatment of mill rollsKonstantin N. Vdovin, Gennady A. Dubskiy, Lyudmila G. Egorova...........................................................................233

Circular economy aspects related to steel productionAndrea Di Schino...........................................................................................................................................................239

Guide for Authors.......................................................................................................................................................245

Composites based on acrylonitrile butadiene rubber designed for sealants contacting potable waterSimona Nikolova, Mihail Mihaylov, Nikolay Dishovsky..................................................................................................249

Microwave irradiation synthesis of 4-sulfo-1,8-naphthalimide in Zn(OAc)2/EtOH-H2O Catherine Gazolla Santana, Otávio Augusto da Silva, Hélcio José Izário Filho,Jayne Carlos de Souza Barbosa, Mario José Politi, Eduardo Rezende Triboni..................................................................260

An intelligent control system of polymerization of a galvanized sheet painted in a coil coating technologyVasiliy M. Oskolkov, Evgeny V. Ershov, Igor A. Varfolomeev, Dmitry V. Bogachev, Ludmila N. Vinogradova..............266

Influence of torrefaction on lignocellulosic woody biomass of Nigerian originAdeleke Adekunle Akanni, Odusote Jamiu Kolawole, Paswan Dayanand, Lasode Olumuyiwa Ajani, Malathi Madhurai..................................................................................................................274

Gasification of the Kuznetsk basin coal concentrate using oxide iron-magnesium catalystsAndrey N. Smirnov, Stanislav P. Klochkovsky, Svetlana A. Krylova, Viktor I. Sysoev....................................................286

The solvent role on the hydrolysis-condensation processes and obtaining of TiO2 nanopowdersAlbena Bachvarova-Nedelcheva, Stancho Yordanov, Reni Iordanova, Irina Stambolova.................................................292

Synthesis, characterization and selected application of chitosan-coated magnetic iron oxide nanoparticles M. A. Radwan, Mohamed Adel Rashad, M. A. Sadek, Hany A. Elazab............................................................................303

Plasma-chemical formation of silver nanoparticles: The silver ions concentration effect on the particle size and their antimicrobial propertiesMargarita Skіba, Alexander Pivovarov, Victoria Vorobyova, Tetiana Derkach, Iryna Kurmakova.....................................311

Stability of urea solutions in presence of mineral acids and their ammonium saltsMladen E. Lilov, Plamen P. Kirilov....................................................................................................................................319

Experimental and numerical investigations of a twin belt caster on the ground of a water model and simulations Nils Lichtenberg, Philipp Kinzel, Nicole A. Parks, Dominique Thévenin, Ulrich Urlau......................................................326

Kinetics of long-term water absorption behavior of different organic waste dust/polymethylmethacrylate compositesKenan Büyükkaya..............................................................................................................................................................339

The electron-microscopic and X-ray spectral analysis of phase composition of CGI inoculant structureDenis Boldyrev, Aleksey Shapovalov, Sergey Nefedyef, Roman Dema, Vladimir Kononov, Maxim Kharchenko, Elena Suvorova, Ivania Markova......................................................................348

Determination of N-methyl carbamates in a liver sample using an optical biosensorSpaska Yaneva, Iskra Stoykova, Dancho Danalev, Lyubov Yotova....................................................................................362

The distribution of protons and deuterons in systems of selected alcohols and primary amines in solutionAlfred Kolbe, Adelheid Kolbe............................................................................................................................................369

Study of the process of adsoption of silver (I) cations by iron hexacyanoferrate under static and dynamic conditions using the model system Fe4[Fe(CN)6]3∙5Н2О – Ag+– Н2О Umirzak Zh. Jussipbekov, Aktolkyn A. Agatayeva, Raissa M. Chernyakova,Marzhan Zh. Kussainova, Kymbat Y. Yermekova, Raushan Kaiynbayeva, Nazym N. Kozhabekova.......................................373

ISSUE 2

Utilization of waste solutions of a high Fe(III) concentration by crystallization of ferric sulfate hydrate Lachezar Stamenov, Vladislava Stefanova, Biserka Lucheva, Stela Atanasova-Vladimirova...............................................379

Intensive cyanidation of gold using an organic reagent-activatorBauyrzhan Surimbayev, Lyudmila Bolotova, Aliya Baikonurova, Brajendra Mishra..........................................................387

Electrochemical amorphous phase formation in metalsOleg B. Girin........................................................................................................................................................................391

ECAP processed silumin AK9 modified by ligature Al alloy: microstructure and mechanical properties Irina Volokitina, Abdrahman Nayzabekov, Sergey Lezhnev, Dmitriy Kuis, Marcin Knapinski..........................................397

Improvement of the technology of production of zinc-titanium alloy stripesAnatoly V. Aldunin..............................................................................................................................................................406

Oxıdatıon behavıor of CuAlTa shape memory alloy at hıgh temperaturesErcan Ercan, Fethi Dagdelen...............................................................................................................................................411

Corrosion of copper in a medium of bacteria sulfate reduction proceedingIryna Kurmakova, Olena Kupchyk, Olena Bondar, Natalia Demchenko, Victoriya Vorobyova......................................416

Corrosion behaviour of Al-12Si-1Mg automotive alloy in acidic, alkaline and salt media containing Zr tracesMohammad Salim Kaiser....................................................................................................................................................423

Study of the anticorrosive action of Eucalyptus Camaldulensis extract in case of mild steel in 1.0 M HClYouness Essaadaoui, Mouhsine Galai, Moussa Ouakki, Lamya Kadiri, Abdelkarim Ouass, Mohammed Cherkaoui, El Housseine Rifi, Ahmed Lebkiri.................................................................431

Passivating anions effect on the anodic behavior of steel in a converting acetate solutionSvetlana Frolenkova, Tatiana Overchenko, Tatiana Motronyuk, Victoria Vorobyova, Iulia Miroshnychenko, Maria Panchenko.........................................................................................443

Effect of organic additives on AA6066 anodizationHossam Jalal, Younis Saoud, François Karabet..................................................................................................................447

Solid waste management in Jordan: impacts and analysisEbtihal A. Aldayyat, Motasem N. Saidan, Mousa A. Abu Saleh, Sudki Hamdan, Colette Linton ......................................454

Guide for Authors...............................................................................................................................................................463

The present issue of Journal of Chemical Technology and Metallurgy waspublishedwiththefinancialsupportoftheBulgarianFund “ScientificResearch”,Contract№КП-06-НП/48/12.12.2018.

ISSUE 3

Synthesis and study of physico-chemical characteristics of novel cationic (co)polymers based on N-isopropylacrylamide and N-(2-vinyloxyethyl)-N-(2-cyanoethyl) amineAsel K. Toktabayeva, Adilet Zh. Alikulov, Raikhan K. Rakhmetullayeva, Grigoriy A. Mun, Аyauzhan М. Tumabayeva, Perizat I. Urkimbayeva, Valentina K. Yu, Tulegen M. Seilkhanov.....................................................467

The new hybrid copolymers based on N-isopropylacrylamideAssel Toktabayeva, Raikhan Rakhmetullayeva, Munziya Abutalip, Alua Mamutova, Aigul Batyrbayeva, Grigoriy Mun.........................................................................................................475

Study of the physicochemical properties of a polymer complex based on poly(hexamethylene guanidine) hydrochlorideAkbota O. Adilbekova, Orynkul A. Esimova, Kuanyshbek B. Musabekov, Gulmira Tulegenova..................................483

Synthesis of new heterocyclic compounds of tetrahydropyrans seriesNazym Yelibayeva, Kulzada Bazhykova, Almagul Umbetova.........................................................................................488

Quantum-chemical substantiation of the structure and properties of chlorhexidineand its boron derivatives as antibacterial additives for nanofilms of medical purposesBalzhan E. Savdenbekova, Aliya K. Оspanova, Roza A. Оmarova, Nikolai F. Uvarov, Mariam K. Iskakova.............................496

Surface tension time and concentration dependencies of multifarious surfactants-based systems containing polyvynyl alcohol Zhanar B. Ospanova, Kuanyshbek B. Mussabekov, Saule B. Aidarova, Reinhard Miller, Mirsalim Asadov...................................503

Procedures used for isolation of complex biological active constituents from Polygonum L.Anastassiya S. Shevchenko, Raisa A. Muzychkina, Samir A. Ross, Dmitriy Yu. Korul’kin...............................................508

Evaluation of mulching technology application for cultivation of agricultural cropsSofiya M. Romanova, Oksana I. Ponomarenko, Ilona V. Matveyeva, Luiza K. Beisembayeva, Nurgul B. Kazangapova, Zulfiya A. Tukenova..........................................................................514

Hydrogenation of aromatic nitro-compounds of а different structure in a liquid phaseYermek Aubakirov, Larissa Sassykova, Sendilvelan Subramanian, Kathirvelu Bhaskar, Ulzhan Otzhan, Magzhan Amangeldi, Tleutai Abildin, Ardak Zhumakanova, Aisulu Zhussupova, Marmar Zharkyn..........................................522

Research of iron-containing concentrates of Balkhash deposit (Kazakhstan) for processing of low-grade coalMarat Tulepov, Zulkhair Mansurov, Larissa Sassykova, Dauren Baiseitov, Orken Dalelhanuly, Zhomart Ualiev, Sholpan Gabdrashova, Zhanar Kudyarova..............................................................531

Preparation and test of catalysts deposited on metal blocks used in synthesis of dimethyl and diisopropyl ethersLarissa Sassykova, Subramanian Sendilvelan, Moldir Telbayeva, Kusman Dossumov, Kathirvelu Bhaskar..........................539

Study of non-hydrogen transformation of model n-alkanes and a diesel fraction over La-Zn-Mn/Al2O3+ZSM-catalystAizhan Omarova, Larissa Sassykova, Marat Tulepov, Nurbubi Zhakirova..........................................................................547

Study of the chemical state of palladium ions in multilayers of a catalytic activityAliya Ospanova, Zheneta Tashmukhambetova, Zhaxyntay Kairbekov, Nazym Ashimkhan, Aisulu Zhussupova......................555

Thermal cracking of natural bitumen in presence of activating additivesYerdos K. Ongarbayev, Yerzhan Imanbayev, Yerbol Tileuberdi, Shynar A. Oteuli,Ainur B. Zhambolova, Zulkhair A. Mansurov, Evgenii B. Krivtsov, Anatolii K. Golovko................................................564

Papers presented by scientists from Faculty of Chemistry and Chemical Technology,

Al-Farabi Kazakh National University, Almaty, Kazakhstan

Chemically heated catalytic converter design options and performance using heated metal oxidesSubramanian Sendilvelan, Larissa Sassykova....................................................................................................................571

Granular rice husk based sorbents for sorption of vapors of organic and inorganic mattersAlmagul R.Kerimkulova, Seitkhan Azat, Leticia Velasco, Zulkhair A. Mansurov, Peter Lodewyckx, Marat I.Tulepov, Makpal R.Kerimkulova, Inna Berezovskaya3, Аldan Imangazy...........................................................578

Sorption and desorption of rhenium ions by lignin sorbents Nazira Chopabayeva................................................................................................................................................................585

Bentonite-containing polymer materials for treatment of wastewater: case studyShynar Zhumagaliyeva, Rizvangul Iminova, Gulfayruz Kairalapova, Zharylkasyn Abilov ...............................................595

Possibility of water purification from Cu2 +, Pb2 + and Cr3 + by using vermiculiteZhansaya Lakhbayeva, Gulnarkhan Kurmangazhy, Sagdat Tazhibayeva, Dana Artykova, Kuanyshbek Musabekov............................................................................................................................603

Sorption of heavy metal ions from aqueous solutions using zeolite modified by polyethylene glycolGulziya A. Seilkhanova, Madina S. Telkhozhayeva, Ainura N. Imangaliyeva, Yenlik Zh. Ussipbekova......................................610

Purification of waters from boron by fatty acids solid-phase extractionLuiza K. Beisembayeva, Oksana I. Ponomarenko, Ilona V. Matveyeva, Sofiya M. Romanova, Sholpan N. Nazarkulova, Sandugash A. Sydykbayeva........................................................................617

Development of a technological procedure and selection of the corresponding optimal parameters of polysaccharides extraction from industrial wastes of tobacco productionMarat T. Shakeshev, Dmitriy Yu. Korul’kin, Raissa A. Muzychkina, Mikhail K. Nauryzbaev........................................622

Mechanism of thermochemical transformation of wheat grain processing wastesKhaidar S. Tassibekov, Rustam R. Tokpayev, Zhenis Zh. Bekishev, Kanagat K. Kishibayev, Aset T. Kabulov, Sergey V. Nechipurenko, Sergey A. Yefremov, Mikhail K. Nauryzbayev...............................................628

Comparative analysis of the modifying effect of individual polyelectrolytes and their complexes with surface-active substancesKainzhamal I. Omarova, Moldir Zh. Kerimkulova.............................................................................................................633

Obtaining hydrogen by aluminum interaction with waterAzhar Bayeshova, Abduali Bayeshov, Serjan Molaigan....................................................................................................639

Amorphous materials based on calcium phosphates Vladimir A. Sinyayev, Elena S. Shystikova, Aigul A. Batyrbayeva, Kamalidin O. Sharipov.............................................643

Preparation and test of slowly burning energy-intensive materials with time-delay compositionSholpan Gabdrashova, Marat Tulepov, Igor Pustovalov, Larissa Sassykova,Nurgul Rakhova, Galiya Spanova, Bolash Hamzina, Brahim Elouadi, Yuri Kazakov.....................................................650

Copper smelter slag leaching by using H2SO4 in the presence of dichromateRashid K. Nadirov, Lyazzat A. Mussapyrova....................................................................................................................657

Guide for Authors...............................................................................................................................................................663

The present issue of Journal of Chemical Technology and Metallurgy waspublishedwiththefinancialsupportoftheBulgarianFund “ScientificResearch”,Contract№КП-06-НП/48/12.12.2018.

ISSUE 4

Synthesis of super absorbent polymer hydrogel based on oil palm empty fruit bunch grafted with acrylic acid and its application as a npk fertiliser carrierSri Mulyani, Bella Seba Sirojul Umah, Dimas Gilang Ramadhani....................................................................................667

pM3 and onioM2 modelling of inclusion complex of ibuprofen enantiomers with dimethyl-ß-cyclodextrinEnung Siti Nurhidayah, Muhamad Abdulkadir Martoprawiro, Muhammad Ali Zulfikar..................................................673

Fabrication and efficiency analysis of dye sensitized solar device using anthocyanin dye combination of mangosteen skin (Garcinia mangostana L.) and rosella flower (Hibiscus sabdariffa L.) extractsHening Asti Rahayu, Endang Susilowati, imam Setiawan, Taufik Ihsan and Titik Muslimah............................................679

Effect of the substrate concentration and the stirring rate on the enzymatic hydrolysis of cellulose from pre-treated corn cob. Derivation of a kinetic modelIrvan Setiadi Kartawiria, Livia Serafin, Haznan Abimanyu..................................................................................................688

Milk curd properties attributed to the application of a pineapple juice as a coagulant in cheese productionIrvan Setiadi Kartawiria, Brenna Elvina, Maria Dewi Puspitasari Tirtaningtyas Gunawan-Puteri.....................................695

An isotherm model of the adsorption of nitrate ions on the surface of silica from sugarcane bagasseJaslin ikhsan, Seti Fani.....................................................................................................................................................702

Transformation of iron nitrate into iron nanoparticles embedded in mesoporous silica molecular sieve SBA-15 nanostructures by ultrasonication and microwave irradiationMaria Ulfa, Teguh Endah Saraswati, Bakti Mulyani, Didik prasetyoko.................................................................................709

Characteristics of LaCro3 nanomaterial. The effect of the calcination temperatureRudy Situmeang , Simon Sembiring, Wasinton Simanjuntak, Zipora Sembiring, Suripto Dwi Yuwono...............................715

Structure and microstructure properties of а refractory cordierite prepared from amorphous rice husk silica resulting from periclace introductionSimon Sembiring, Wasinton Simanjuntak, Rudy Situmeang............................................................................................721

The proliferation of effective microorganism (EM) in vinasse and its application in the manufacture of livestock-waste based fertilisersTriastuti Sulistyaningsih, nuni Widiarti, Widi Astuti, Dewanto Harjunowibowo.............................................................727

Synthesis of 1-benzyl-3-methyl-6,7-dimethoxy-3,4-dihydroisoquinoline to be used as a potential hybrid drugNova Rifatul Ulya, Sabirin Matsjeh, Winarto Haryadi, Dewanto Harjunowibowo...............................................................733

A natural antioxidant and an environmentally friendly inhibitor of mild steel corrosion: A commercial oil of basil (Ocimum basilicum L.)Hicham Elmsellem, Yassir El ouadi, Majda Mokhtari, Hajar Bendaif, Hanae Steli, Abdelouahed Aouniti, Ahmed M. Almehdi, Ibrahim Abdel-Rahman, Heri Septya Kusuma, Belkheir Hammouti................................................742

Development of a method for quantification of two genotoxic impurities in lurasidone using LC-MS/MSManthrapudi Venu, Yenugu Veera Manohara Reddy, Ambavaram Vijaya Bhaskar Reddy, Mohammad Moniruzzaman, Heri Septya Kusuma, Gajulapalli Madhavi...........................................................................750

Electrochemical determination of paracetamol at poly(orange dye) modified carbon paste electrode by using cyclic voltammetryChougoni Madhuri, Sundupalle kiranmai, Duddukuru Saritha,Vipparla prabhakara Rao, Gajulapalli Madhavi, Heri Septya Kusuma..............................................................................758

Reactive absorption of CO2 into the solution of methyldiethanolamine. Effect of promoter content in packed columnAriani, Ali Altway, Susianto, Suprapto.............................................................................................................................765

Bitumen extraction from asbuton using hot water process with na2Co3 as a sealing agent Zakijah Irfin, Ali Altway, Susianto, Suprapto, Yosita Dyah Anindita................................................................................770

On the effect of the ratio of the distiler volume and that of the microwave cavity on the extraction of Cymbopogon nardus dried leaves by microwave hydrodistillationZuhdi Ma`sum, Heri Septya kusuma, Ali Altway, Mahfud Mahfud...................................................................................778

The application of face-centered central composite design for the optimization of patchouli oil extraction from Pogostemon cablin benth dried leaves using microwave hydrodistillation methodHeri Septya kusuma, Ali Altway, Mahfud Mahfud............................................................................................................787

Extraction of an essential oil from fresh cananga flowers (Cananga odorata) using solvent-free microwave methodDitta kharisma, Yolanda putri, intan Ekawati puspa Dewi, Heri Septya kusuma, Mahfud Mahfud................................793

An optimization of microwave hydrodistillation extraction of vetiver oil using a face-centered central composite design Heri Septya kusuma, Ali Altway, Mahfud Mahfud.............................................................................................................803

A design and an optimization of an eco-friendly extract for inhibition of mild steel corrosion in sulphuric acid mediaJoseph N.O. Ezeugo..............................................................................................................................................................810

Distribution of sulfur dioxide and phosphorus pentoxide in an air pool obtained by correlation and regression analysisMаlik N. Abdikarimov, Raushan Kh. Turgumbayeva, Saule S. Sagintayeva, Rasylbek Mussabekov, Gulzhan Sh. Ospanova..................................................................................................................826

Determination of organophosphorus pesticides in liver samples using an optical biosensorSpaska Yaneva, Iskra Stoykova, Dancho Danalev, Lubov Yotova.....................................................................................831

Study on the impact of the modifier К2СО3 on the texture parameters of newly synthesized gas mask carbonsLiliya Manoilova , Radostin Nickolov................................................................................................................................838

Exploring the impact of different soft reducers in reduced graphene oxide synthesisDiana Kichukova, Anna Staneva, Daniela Kovacheva, Ivalina Tzoneva............................................................................845

Chemical characterization and economic evaluation of the coal fly ash pre-washing and carbonation processAlessandro Mazzella, Massimiliano Errico, Daniela Spiga..............................................................................................855

Guide for Authors...............................................................................................................................................................867

The present issue of Journal of Chemical Technology and Metallurgy was published with the financial support of the Bulgarian Fund “Scientific Research”, Contract № КП-06-НП/48/12.12.2018.

ISSUE 5

Determination of the kinetic parameters of thermal degradation of high density polyethylene films containing iron (III) acetylacetonate by the isoconversion methodMariana Tavlieva, Dimitrina Kiryakova, Atanas Atanassov...............................................................................................871

A study on thermal and rheological cure characterization of a sulfur-containing epoxy resinOmar Dagdag, Mehdi El Bouchti, Omar Cherkaoui, Othman Hamed, Mustapha El Gouri, Saîd Dagdag, Ahmed El Harfi................................................................................................................881

Dielectric properties study of epoxy resin modified with tetraethoxysilane and tetrapropoxysilane in centimeter microwave rangeVladimir Yu. Chukhlanov, Oleg G. Selivanov, Natalia V. Chukhlanova..............................................................................889

Synthesis and investigation of pentaglycidyl ether pentaphenoxy phosphoric polymer and formulation of nanocomposite (PGEPPP/MDA/TiO2)Rachid Hsissou, Mohamed Berradi, M’hammed Grich, Hanane Bahaj, Mehdi El Bouchti, Mohammed Khudhair, Hicham Es-sahbany, Mohamed Rafik, Ahmed Elharfi.....................................................................893

Mathematical modeling of the thermomechanical destruction process of elastomers treated with ionizing radiationAnatoly K. Pogodaev, Sergey G. Tikhomirov, Olga V. Karmanova, Semen L. Podvalny, Anatoly A. Khvostov, Andrey V. Karmanov......................................................................................................................902

Study on the physical and mechanical performance of biodegradable polyamide6/ethyleneoctene nanoclay reinforced nanocompositeHamid Reza Movahed, Nooredin Goudarzian, Seyyed Mojtaba Mousavi, Seyyed Alireza Hashemi, Ali Rostamyar...................................................................................909

Comparison of mathematical models describing mushroom (Amanita caesarea) dryingMiroslava Teneva Ivanova, Nedyalko Todorov Katrandzhiev, Lilko Kamenov Dospatliev, Penko Kolev Papazov.............................................................................................................920

Effect of doping of TiO2 nanoparticles with silver on their photocatalytic activities toward degradation of E 131 VF Georgette Charbel Estephane, Mouhiaddine Mohamed El Jamal........................................................................................926

Facile synthesis of reduced graphene oxide-supported Pd/CuO nanoparticles as an efficient catalyst for cross-coupling reactions Hany A. Elazab, M.A. Sadek, Tamer T. El-Idreesy..............................................................................................................934

Investigation of electrochemical behavior of new hemorphin-5 analogueStela Georgieva, Petar Todorov, Petia Peneva........................................................................................................................947

Extraction of valuable compounds from Bulgarian St. John’s wort (Hypericum perforatum L.). Antioxidant capacity and total polyphenolic content Ralitsa Chimshirova, Maria Karsheva, Svetlomir Diankov, Ivaylo Hinkov........................................................................952

Selective adsorption of thiophene and its polyaromatic derivatives from fuels on pyrolyzed rice husks: A thermodynamic studySnejanka Uzunova, Ivan Uzunov, Genoveva Atanasova, Daniela Angelova, Ivan Ivanov...............................................962

Effect of magnetic field on cellulose refining process and strength propertiesDimitrina Todorova, Kiril Dimitrov.....................................................................................................................................978

Wheat straw solvolysis delignificationIryna Trembus, Vita Halysh.................................................................................................................................................986

The estimation of the efficiency of mine water stabilization treatment methods during evaporation (M. Gorky mine, Donetsk C.)Tatiana Overchenko, Olena Ivanenko, Iryna Trembus, Svitlana Frolenkova, Viktorya Vorobyova.....................................993

An influence of modifying acids on clinoptilolite composition and structure Kairat A. Kadirbekov, Dauren K. Zhambakin, Almaz K. Kadirbekov,

Kylysh I. Imanbekov, Ainur K. Shakirova, Zamira K. Bayakhmetova...............................................................................999

Calcareous clays: phase composition and adsorption capacity for heavy metal ionsIrena Mihailova, Paunka Vassileva, Dimitar R. Mehandjiev..............................................................................................1009

Assessment of leachate and soil contamination with heavy metals around deposit sites in Podujeva and PrizrenTafë Veselaj, Rifat Morina, Valdet Gashi, Fatbardh Sallaku.................................................................................................1020

Development of reliable building bricks incorporating olive-mill wastewater focusing on thermal insulation and energy savingsXenofon Spiliotis, Vayos Karayannis, Stelios Lamprakopoulos, Stefanos Zaoutsos, George Papapolymerou.................1028

Acoustic and optical properties of Ag4SSe.2PbTeGergana Alexieva, Anna Amova.........................................................................................................................................1035

Factors controlling magnetic properties of CoFe2O4 nanoparticles prepared by contact low-temperature non-equilibrium plasma methodLilya A. Frolova, Alona V. Derimova.................................................................................................................................1040

Slag quantity minimization in the pyrometallurgical production of anode copperDimitar Borisov.....................................................................................................................................................................1047

Research of the leaching process of industrial waste of titanium production with nitric acidAzamat Yessengaziyev, Almagul Ultarakova, Bagdaulet Kenzhaliyev, Peter C. Burns....................................................1061

Phosphatizing of mild steel in zinc-manganese-nickel phosphates in different correlationsDimka Ivanova...................................................................................................................................................................1072

Impact of nanomodifying compositions on the corrosion characteristics of cast iron grade GG25Vanya Dyakova, Yoanna Kostova, Gergana Burdin..........................................................................................................1079

Simulation of radial-shear rolling of austenitic stainless steel AISI-321Abdrakhman B. Naizabekov, Sergey N. Lezhnev, Alexandr S. Arbuz, Evgeniy A. Panin, Toncho A. Koinov...................1086

Analysis of parameters affecting the plastic deformation behavior in austenitic stainless steel pipesAndrea Di Schino..............................................................................................................................................................1095

Decision support system for condition based maintance of steel casting ladlesIvanka Petrova, Emil Mihailov, Kosta Boshnakov.............................................................................................................1103

A strip cooling process representation on the basis of radial basis neural networksIrina А. Sedykh, Vladimir А. Istomin, Igor P. Mazur.........................................................................................................1114

Guide for Authors..................................................................................................................................................................1119

ISSUE 6Photoinduced birefringence in Pazo polymer nanocomposite films with embedded particles of biologically active metal complexesGeorgi Mateev, ani Stoilova, Dimana Nazarova, Lian Nedelchev, Petar Todorov, Stela Georgieva, Yordanka Trifonova, Vanya Lilova.......................................................................................................1123

Review on epoxy polymers composites with improved propertiesRachid Hsissou, atiqa Bekhta, Mohammed Khudhair, Mohamed Berradi, Naoual El-Aouni, Ahmed Elharfi............................................................................................1128

Synthesis and properties of functionalized styrene-butadiene rubbersanatoly K. Pogodaev, olga V. Karmanova, alena V. Firsova, Vladimir S. Glukhovskoy, Sergey G. Tikhomirov, Semen L. Podvalny....................................................................................................................1137

Lignocellulosic biomass main components study through pyrolysis: non-condensable volatile organic compoundsStefan Marinov, Maya Stefanova, Jan Czech, Robert Carleer, Jan Yperman..........................................................1141

Synthesis and antimicrobial activity of 1,8-naphthalimide derivatives of nalidixic acidMarin Marinov, Iliana Kostova, Emilia Naydenova, Neyko Stoyanov .......................................................................1146

Enzyme profile of lactobacilli from traditional Bulgarian fermented milk productsVeronica Nemska, Svetla Danova, Nelly Georgieva...............................................................................................1157

Serialization of pharmacetical products: EU delegated act 2016/161 to protect against falsified medicines (Review)Nikolay Karev, Dimitar Raychev............................................................................................................................1165

White mineral binder based on Cao - Sio2 - al2o3 system with varieties of silica componentLev Chernyak, Liubov Melnyk, Natalia Dorogan, Valentyn Svidersky, Ludmyla Nudchenko....................................1171

Coagulation-flocculation performance of snail shell biomass in abattoir wastewater treatmentJoseph Tagbo Nwabanne, Christopher Chiedozie Obi ...........................................................................................1177

Computer simulation of the processes in the biological stage of wastewater treatment plant: Case study of Sofia wastewater treatment plantIvan Davidov, Irina Kostova, Mariana Koleva.........................................................................................................1189

optimization of the preparation conditions of an eggshell/anthill composite adsorbent using a central composite design adeyinka Sikiru Yusuff .........................................................................................................................................1202

Synthesis and characterization of YBCo and YBCo/ag superconducting ceramic composites containing reduced graphene oxide Janna Mateeva, anna Staneva, Boris Martinov, Blagoy Blagoev, Timur Nurgaliev...................................................1215

Decorated graphene oxide with octadecyl amine/sasobit/epoxy nanocompositevia vacuum shock technique: morphology and beams shieldingSeyyed Mojtaba Mousavi, Seyyed alireza Hashemi, Younes Ghasemi....................................................................1223

Comparative analysis of nanocrystalline CuWo4 obtained by high-еnergy ball millingMaria Gancheva, Izabela Szafraniak-Wiza, Reni Iordanova, Iskra Piroeva............................................................1233

Synthesis, molecular structure and DFT studies of Sm2(OH)2(SeO3)(HSeO3)2(H2O)2Rumyana Yankova, Svetlana Genieva, Ginka Dimitrova, Miluvka Stancheva.....................................................1240

Kinetics of reduction of waste fayalite by calcium carbideDaniela Grigorova, Rossitza Paunova....................................................................................................................1256

Production of NP fertilizers based on the decomposition of poor phosphates using a mixture of phosphoric and sulphuric acidsa’zam a. Rasulov, Umar K. alimov, atanazar R. Seytnazarov, Shafoat S. Namazov, Bokhodir E. Sultonov...................1263

Effect of H3Po3 and NaH2Po2 in the electrolyte on the composition and microstructure of Ni-Co-P alloysKatya Ignatova, Momchil alakushev, Stephan Kozhukharov, Yordanka Marcheva, Stela Vladimirova, Georgi avdeev...........................................................................................1271

Steric stabilization of colloidal aluminium particles for advanced metalized-liquid rocket propulsion systems Sherif Elbasuney, Mostafa A. Radwan, Hany A. Elazab...........................................................................................1281

Investigation of the effect of nickel content on the structural and phase transformation and properties of high-strength cold-resistant complex-alloyed steelPavel P. Poletskov, Marina S. Gushchina, olga a. Nikitenko, alla S. Kuznetsova,Natalia V. Koptseva, Yuliya Yu. Efimova, Dmitry M. Chukin..........................................................................................1291

Improvement of operational efficiency of cold rolling mill work rolls aleksandr V. Kozhevnikov, Irina a. Kozhevnikova, Nataliya L. Bolobanova, Pavel V. antonov, Dmitry A. Anisimov 1298

Thin-walled steel billets production quality managementoleg I. Boriskin, Sergey N. Larin, aleksandr S. Yamnikov, Georgiy a. Nuzhdin, Dmitriy I. Blagoveshchenskiy 1305

The influence of the chemical composition of carbon and low-alloyed steels on critical strain for dynamic recrystallizationValeriy V. Shkatov, Marcin Knapinski, Igor P. Mazur...............................................................................................1312

Perspectives in the field of continuous steel casting computer simulationalexey a. Shipelnikov, aleksandr N. Rogotovsky, Sergey V. Skakov, Natalya a. Bobyleva..................................1317

Research of efficiency of technological lubricants for hot metal stamping in productionIgor Volodin, Pavel zolotukhin, alexander Volodin, alexander Schmidt................................................................1323

Modeling of the thermal state of the hot rolled strip in the accelerated cooling process Part I: Heat transfer modelalexander Koldin, Roman Dema, Marina Nalimova, Emil Mihailov, alexey Shapovalov, Maxim Kharchenko...........1330

Development and research of the new forging technology of billets in the step-wedge diesandrey О. Tolkushkin, Sergey N. Lezhnev, abdrakhman B. Naizabekov, Evgeniy a. Panin, Rozina M. Yordanova, Daniyar R. zhumagaliyev.................................................................................................1337

agglomeration process productivity increasing by a sinter mix preheatingalexey Shapovalov, Roman Dema, olga Kalugina, Maxim Kharchenko, Sergey Nefedyev, alexander Koldin, Emil Mihailov...........................................................1344

Inhibition and adsorption effeϲts of Lavandula and Riϲinus ϲommunis oils on mild steel ϲorrosion in H2So4 Cleophas a. Loto, Roland T. Loto............................................................................................................................1352

Mechanical and wear behaviour of aluminium hybrid composites reinforced with varied aggregates of alumina and quarry dustKenneth Kanayo Alaneme, Miracle Hope Adegun, Abraham Godwin Archibong, Eloho Anita Okotete...................1361

Guide for authors....................................................................................................................................................1371