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DESCRIPTION
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BECHTEL CHILE LTDA
BECHTEL CHILE LTDA.
PROCESS DESIGN CRITERIA
25414-138-3DR-V01L-00002FOR
MOLY PLANTPROYECTO DESARROLLO LOS BRONCES
ANGLO AMERICAN CHILEDLB-CRT-4520-FS-2002
021-Dec-07Issued for ConstructionMTAWBMTA
REVDATEREASON FOR REVISIONBYCHECKEGSPECLIENT
JOB No. 25414
DESIGN CRITERIA No.25414-138-3DR-V01L-00002
Page 1 of 32REV.
0
TABLE OF CONTENTS31.0GENERAL
31.1Introduction
31.2Source Codes
31.3Definition of Design Value Terms
52.0PROCESS SUMMARY
52.1Project Description
52.2Process Description
83.0MEASUREMENT UNITS AND SYMBOLS
114.0SITE DATA
115.0ENVIRONMENTAL CRITERIA
126.0DESIGN CRITERIA REFERENCE DOCUMENTS
137.0PRODUCTION SUMMARY
138.0CHARACTERISTICS OF PROCESS MATERIALS
149.0FLOTATION CIRCUIT
1810.0MOLY CONCENTRATE DEWATERING
2011.0STORAGE AND LOADOUT
2212.0REAGENTS
2813.0ADDENDUM: MASS BALANCE
1.0 GENERAL1.1Introduction
The following design criteria are for the engineering, design and specification of the process requirements for the Los Bronces Molybdenum Plant and encompass the following operations:
Concentrate Storage
Moly Flotation
Moly Concentrate Thickening, Filtration and Drying
Moly Concentrate Storage and Loadout
Reagent Storage and Distribution
Anglo American Chile Limited has commissioned Bechtel to complete detail engineering for 87_000 tons per day new concentrator facilities to be operated in conjunction with the existing Los Bronces operation. The new Molybdenum plant, located at Las Trtolas Concentrator, will process 2 330 tons per day of Cu-Mo concentrate.
1.2Source Codes
The sources code letters listed for each criterion refer to the origin of that criterion value. Where an integer is entered with a source code letter, this code number refers to specific source documents that are referenced in Section 6. In certain cases, two source codes may be referenced. The following letter code designators are used:
CodeDescription
A
B
C
D
E
F
G
H
ICriteria provided by AAStandard industry practice
Bechtel recommendation
Vendor-originated criteria
Criterion from process calculations
Engineering handbook data
Assumed data
Criteria provided by Technology Supplier
Metallurgical test results
1.3Definition of Design Value Terms
The process criteria are listed as Flowsheet BALANCE and/or DESIGN. The context in which these terms are used is in accordance with the following definitions:
Annual Rate:Flow rate per 365 calendar days.
Operating Days:The number of plant operating days per year is 365 days.
Utilization:A utilization factor of unity represents the capability of, and requirement for, any equipment or facility being on-line for 24 hours per day for all operating days in the year. A utilization of less than unity reflects the combined effect of allowed availability for that facility and the utilization effect from the on-line time of upstream or downstream equipment, or from other factors.
Flowsheet Balance:The values in the Flowsheet Balance column (generally flow rate) that represent the steady-state average rate during the design utilization time per operating day for any facility or equipment. Thus,
Annual Rate=Flowsheet Balance daily rate
x n of operating days per year
=Flowsheet Balance hourly rate
x 24 hour
x plant utilization factor
x n of operating days per year
Where criteria flow values are for time units of less than one hour, they are intended to represent the equivalent of continuous hourly rates in the relationship above.
In accordance with this definition, all Flowsheet Balance flow rates, together with the respective utilization factors, should be consistent with a single annual mass balance.
Balance throughput of the Moly Plant is based on a daily treatment of 2 330 tons of bulk Cu-Mo concentrate. Head grade, concentrate grade and recovery are the arithmetic average for the years 2012 through 2016 on the basis of the production plan developed for the LOM1-2007 (20/04/07 version).Design Value:The criteria values in this column provide the instantaneous process criterion values that take account of flows that operate for less than 24 hours during one operating day, or where it is intended that the particular equipment will have an additional capacity to allow for maintenance, catch-up capability or for variability in process parameters. The Design values are intended as attainable continuous rates and do not include any additional design allowance(s), by engineer or vendor, to ensure attainment. The combinations of Design values neither relate to the annual productions defined nor integrate to represent a metallurgical balance. The Design values are individual rates used for sizing equipment.
Moly flotation and thickening are designed to operate on a continuous basis 365 days per year with a utilization of 95 percent. Moly drying is designed to operate on a continuous basis 365 days per year with a utilization of 50 percent.
In general, the following factors will be applied for equipment sizing unless specified otherwise:
From moly feed storage tank, rougher cells and moly plant final tailings (final Cu concentrate) lines the design flow will be 130 percent of the balance flow (balance flow x 1.30) on a mass basis.
From rougher concentrate through cleaner circuits, moly concentrate thickening and drying, the design flow will be 160 percent of the balance flow (balance flow x 1.60) on a mass basis.
For water lines the design flow will be 200 percent of the balance flow (balance flow x 2.0).
A froth factor is applied to the design flow volumes as stated in flow diagrams, material balance, and equipment specifications, and affects the sizing of volume components such as pump casings and impellers, sumps, and suction piping. Generally, a froth factor (FF) of 2.0 to 5.0, as indicated in the design criteria, is used for concentrate streams. For tailings streams a froth factor of 2.0 will be applied. Froth factor will be used as design flow x FF where applies.Pump motor power requirements are based on maximum mass flow rates as indicated on the process flow diagrams.
2.0 PROCESS SUMMARY
2.1Project Description
Currently, a 61 000 tons per day copper concentrator is operating at Los Bronces. As part of the Los Bronces Development Project, Minera Sur Andes will build a new concentrator to process 87 000 tons per day of ore. This new concentrator will be operating in conjunction with the existing Los Bronces operation. All of the supporting facilities will be modified or upgraded as required.
2.2Process Description
A molybdenum product will be separated from the bulk (Cu-Mo) concentrate as part of the concentrator process. The molybdenum processing includes the drying and packaging of the final moly concentrate for transportation by truck.
Copper-molybdenum concentrate at approximately 60 percent solids from the new concentrator will be delivered into a new 200 m3 agitated concentrate storage tank which will provide surge capacity to smooth the feed rate and adjust for grade fluctuations prior to feeding the process facilities. Normally, the new storage tank will feed Cu-Mo concentrate to the moly flotation plant and eventually will feed to the copper concentrate filter plant. In this storage tank the pulp will be conditioned with diesel and sulfuric acid. The Cu-Mo concentrate from the storage tank will be diluted to approximately 44 percent solids with water and subjected to selective flotation in one row of twelve 14 m3 (500 ft3) conventional flotation sealed cells (roughers). In this circuit, copper minerals will be depressed with sodium hydrosulfide while diesel oil will be used to collect and float the molybdenum sulfide. The rougher tailings, which contain the majority of the copper and iron sulfide minerals, will be pumped to the copper concentrate thickeners for dewatering.
Moly concentrate from the rougher cells will be cleaned in three 8.5 m3 (300 ft3) first cleaner cells and two 8.5 m3 (300 ft3) second cleaner cell for upgrading. Tailings from the first cleaners will be recycled to the rougher cells and tailings from the second cleaners will be recycled to the first cleaners. The second cleaner concentrate will be pumped to a 200 m3 storage tank and then feed one 2.2 m diameter cleaner column cell (3rd cleaner), where a final concentrate containing 50.5 percent molybdenum will be produced. The final concentrate feed to a 12 m diameter thickener for dewatering. The final molybdenum concentrate will be dewatered further in a disc filter and a dryer. Final molybdenum concentrate will be stored in a 12 ton surge bin prior to packaging in bags for transportation.
Reagents
Reagent storage and distribution areas will be provided for the four reagents required in the molybdenum flotation circuits: sulfuric acid, sodium hydrosulfide (NaHS), diesel oil and P-4000 or similar.
Diesel oil will be unloaded by a pump from 19 000 liter tank trucks and transferred to a 40 m3 storage tank equipped with flame arrester. The diesel oil will be pumping in a loop circuit by two (one operating and one standby) 7 m3/h pumps, to feed three 10-150 cm3/min (two operating and one standby) metering pumps which fed diesel oil to the rougher feed conditioner tank and to the third cleaner feed tank; the loop will feed also the drying system and the P-4000 storage tank for dilution.
Aqueous sodium hydrosulfide (30 to 42% NaHS by weight) will be delivered in 19 000 liter tank trucks. The aqueous sodium hydrosulfide will be unloaded by a pump and transferred to two 400 m3 storage tanks. While the tank truck is being emptied, it will be vented through a vapor capturization system to the storage tank vent which is then vented through a second vapor capturization system before being released to the atmosphere. The aqueous sodium hydrosulfide will be pumped to a daily consumption tank, via a loop and a separate mixing line, by two (one operating and one standby) 10 m3/h pumps. Aqueous sodium hydrosulfide will be fed from 21 m3 capacity daily tank by two 0.6 1.5 m3/h metering pump to the rougher feed box, and by seven 0.1 0.4 m3/h metering pumps (five operating and one standby) to rougher cells transfer box, 1st cleaner and 2nd cleaner cells feed box, and third cleaner feed box.
Sulfuric acid (98 % H2SO4) will be delivered in 12 000 liter tank trucks to a 70 m3 storage tank, then it will transferred to a 6 m3 capacity daily tank by two 5 m3/h pumps (one operating and one standby). Sulfuric acid will be fed from the daily consumption tank by two 0.9 3.0 L/min metering pumps to the rougher feed conditioner tank (one operating and one standby) and by four 0.2 0.6 L/min metering pumps to rougher, first cleaner and second cleaner feed box (three operating and one standby).
Glycol (P-4000 or similar) will be delivered in 204 L drums. The glycol will be pumped to a 12 m3 storage tank. Glycol will be mixtured with diesel at 10% solution by utilizing a mixing line and a 5 m3/h recirculating pump, which also feed a 5 m3 day tank. Glycol/diesel is fed to the moly plant flotation circuits for froth control by five 15 - 150 cm3/min metering pumps (including one standby).
Table no. 2.1
Summary of Design Criteria
UnitValue
Production Summary
Feed rate
Mo content
Moly recovery
Moly concentrate production
Concentrate gradet/d
%
%
t/d
%2 330
0.45
90
19
50.5
Rougher Flotation
Machine size
Machine type
Number of rows
Cells per rowm3no.
no.14.2
Enclosed
1
12
1st Cleaner Flotation
Machine size
Machine type
Number of rows
Cells per rowm3no.
no.8.5
Enclosed
1
3
2nd Cleaner Flotation
Machine size
Machine type
Number of rows
Cells per rowm3no.
no.8.5
Enclosed
1
2
3rd Cleaner Flotation
Machine size
Machine type
Number of cellsno.2.4m x 12m HEnclosed
1
Moly Concentrate Thickener Type
Thickener diameter
Quantitym
no.Conventional
12
1
Moly Concentrate Dryer
Type
Capacity
Quantityt/h
no.Oleo-electrical
3.0
1
3.0 MEASUREMENT UNITS AND SYMBOLS
The Metric System of measurement used in this process design criteria is in accordance with Bureau International des Poids et Mesures. A period, not comma, is used as the decimal marker. A small space (with no comma) is used to separate groups of three integers.
The reference conditions for gas volume are 0 C and 101.325 kPa, corresponding with a molar (ideal) gas volume of 22 414 m3/(kg(mol). This is shown as m3 (normal) or abbreviated to (non SI) Nm3. The unit t rather than Mg, is used for 1 000 kg mass.
SI Base Units: (dimensionally independent)
Measured AttributeUnitSymbol
Lengthmetrem
Masskilogramkg
Timeseconds
Electric currentampereA
Thermodynamic temperatureKelvinK
Amount of substancemolemol
Luminous intensitycandelacd
Permitted Base Units:
Measured AttributeUnitSymbolDefinitionTimeminutemin60 s
hourh60 min
dayd24 h
(calendar) yeary365 d
Massmetric tont1 000 kg
(Note: SI prefixes, as listed below, are used only with SI base units. It is incorrect to use these prefixes with the permitted base units.)
SI Prefixes: (selected list only)
Multiplication FactorPrefixSymbol
1012teraT
109gigaG
106megaM
103kilok
102hectorh
10dekada
Multiplication FactorPrefixSymbol
10-1decid
10-2centic
10-3millim
10-6micro
10-9nanon
10-12picop
The prefixes and prefix symbols are used with the SI base units and derived units - with the exception of kg. The base mass unit, kg, already has a prefix, and the SI prefixes are then applied to the unit gram (g). In this manner, the symbol for metric ton is Mg, however in this criteria the permitted alternate, t as listed above, is used. The ASTM permitted form Wh is used rather than W(h.
Derived SI Units of Special Name:
Measured AttributeUnitSymbolFormulaFrequency (periodic)hertzHz1/s
ForcenewtonNkg(m/s2Pressure, stresspascalPaN/m2Energy, work, heat qty.jouleJN(m
Power, radiant fluxwattWJ/s
Qty. of electricitycoulombCA(s
Electric potential, emfvoltVW/A
Electric capacitancefaradFC/V
Electric resistanceohm(V/A
Electric conductancesiemensSA/V
Magnetic fluxweberWbV(s
Magnetic flux densityteslaTWb/m2InductancehenryHWb/A
Celsius temperaturedegree CelsiusCK-273.15
Plane angleradianraddimensionless
Solid anglesteradiansrdimensionless
Luminous fluxlumenlmcd(sr
Illuminenceluxlxlm/m2Activity (of a radionuclide)becquerelBq1/s
Absorbed dosegrayGyJ/kg
Dose equivalentsievertSvJ/kg
Units in Use:
Measured AttributeUnitSymbolDefinitionPlane angle raddegree1 = (/180)
minute'1' = (1/60)
second"1" = (1/60)'
VolumelitreL1 L = 10-3 m3Areahectareha1 ha = 104 m2Energy (electrical)kilowatt-hourkWh1 kWh = 3.6MJ
Some Common Derived Units:
Measured AttributeUnitSymbolAccelerationmetre per second squaredm/s2Angular accelerationradian per second squaredrad/s2Angular velocityradian per secondrad/s
Areasquare metrem2Concentrationmol per cubic metremol/m3Current densityampere per square metreA/m2Density (mass)kilogram per cubic metrekg/m3Electric flux densitycoulomb per square metreC/m2Entropyjoule per KelvinJ/K
Heat capacityjoule per KelvinJ/K
Heat flux densitywatt per square metreW/m2Luminancecandela per square metrecd/m2Magnetic field strengthampere per metreA/m
Molar energyjoule per moleJ/mol
Molar entropyjoule per mole KelvinJ/(mol(K)
Molar heat capacityjoule per mole KelvinJ/(mol(K)
Moment of forcenewton metreN(m
Permeability (magnetic)henry per metreH/m
Power densitywatt per square metreW/m2Specific heat capacityjoule per kilogram KelvinJ/(kg(K)
Specific energyjoule per kilogramJ/kg
Specific entropyjoule per kilogram KelvinJ/(kg(K)
Specific volumecubic metre per kilogramm3/kg
Surface tensionnewton per metreN/m
Thermal conductivitywatt per metre KelvinW/(m(K)
Thermal conductancewatt per square metre KelvinW/(m2(K)
velocitymetre per secondm/s
viscosity, dynamicpascal secondPa(s
viscosity, kinematicsquare metre per secondm2/s
volumecubic metrem3Abbreviations of Other Terms:
TermAbbreviationalternating currentac
barrelbbl
boiling pointbp
cosinecos
cotangentcot
decibeldB
diameterdia
direct currentdc
electromotive forceemf
induced draftID
inside diameteri.dia
maximummaxm
minimumminm
mole percentmol %
molecular mass (weight)mol wt
parts per billionppb
parts per millionppm
parts per million by volumeppmv
parts per million by mass (weight)ppmw
power factorPF
revolutions per minuterpm
revolutions per secondrps
root mean squarerms
sinesin
specific gravitySp Gr
tangenttan
temperaturetemp
ultra high frequencyUHF
very high frequencyVHF
volumevol
volume percentvol %
weight (mass)wt
weight (mass) percentwt %
4.0 SITE DATA
Refer to document Condiciones de Planta for general site conditions, Bechtel document N 25414-138-3DR-G01L-00001.
5.0 ENVIRONMENTAL CRITERIA
Refer to document Criterios de Diseo Medio Ambiente for general environmental criteria, Bechtel document N 25414-138-3DR-H01L-00001.
The Molybdenum Plant will be designed as a zero discharge facility with all discard reporting to the evaporation ponds. The tailings from the moly rougher flotation cells will be the final copper concentrate and will flow to thickeners. The thickener overflows will be returned to the process facilities or discarded. Process and reagent spills will be contained in detention areas.
6.0 DESIGN CRITERIA REFERENCE DOCUMENTS
The following major documents were used to prepare the design criteria for the Los Bronces Molybdenum Plant.
6.1 Process Design Criteria, Intermediate Expansion Option, Minmetal, August 2nd 2005, Rev. P.6.2 Process Design Criteria for Molybdenum Plant, Basic Engineering, Bechtel, June 2007, Rev. T.6.3 Plan de Produccin de largo plazo LOM1 2007 (20/04/07 version).
7.0 PRODUCTION SUMMARY
7.1Metallurgical SummaryE,A6.3MolybdenumTonnageCopperMolybdenum
Plantt/h% wt% Cu%Cu Dist.% Mo%Mo Dist.
Cu-Mo Concentrate102.2100.027.5100.00.45100.0
Copper Concentrate101.499.227.799.930.0510.0
Moly Concentrate0.80.82.50.0750.590.0
Refer to the material balance spreadsheet for additional data on flowrates and recoveries for each process unit operation. A copy of the material balance is included in Section 13.0, Addendum Mass Balance, of this document.UnitsBalanceDesignCode
7.2Operating Schedule
Operating days per yeard365365A6.1
Operating hours per dayh2424A6.1
Plant utilization
Flotation and Thickening
Drying%%95
5095
50CE
8.0 CHARACTERISTICS OF PROCESS MATERIALS
8.1Plant Feed (Cu-Mo Concentrate)Throughputt/d2 330A6.3
t/h102133E
Assay
Cu
Mo%
%27.50.4527.50.45A6.3A6.3
Solid specific gravitySp.Gr.4.24.2B
Cu-Mo thickener underflow% wt6060B
8.2Moly Concentrate
Throughputt/d19A6.3
t/h0.81.3E
Assay
Cu
Mo%
%2.5
50.52.5
50.5A6.3A6.3
Solid specific gravitySp.Gr.4.54.5B
Final Moisturewt %44B
9.0 FLOTATION CIRCUIT9.1 Conditioning9.1.1 Moly Plant Feed (Cu-Mo concentrate thickener discharge)Feed ratet/h102133E
Solids specific gravitySp Gr4.24.2B
Pulp percent solidswt %6060B
Pulp flow ratem3/h92120E
Pulp specific gravitySp Gr1.841.84E
Pulp pH10.510 -11B
9.1.2 Storage Tank
TypeOpen, agitated, pump dischargeA6.2
Number of tanksno.1C
Capacity (net)m3200E
Tank size (dia x height)m6.6 x 6.6E
Retention time (based on 60% solids)h2C
Live Storage, range%35 to 93B
Pulp pH at discharge7.57.0 7.5A6.2
9.2 Rougher Flotation9.2.1Rougher Flotation FeedRougher feed ratet/h108140E
Solids specific gravitySp Gr4.24.2E
Pulp percent solidswt %3938 40B
Pulp flow ratem3/h195253E
Pulp pH7.57.0 7.5A6.2
Froth factor2.0B
9.2.2 Rougher Flotation Time and Machine Size
Flotation timemin3430A6.1
Effective cell volume factor%85B
Rougher cellsno.1212E
TypeCovered conventionalA6.2
Sizem3ft314
500A6.2A6.2
Arrangement1 row of 12 cells; 3 3 3 3E
ORPmV-400 to -550A6.2
9.2.3 Rougher ConcentrateMo content in concentrate%10.010.0A6.1
Mo recovery%93.493.4A6.1
Rougher concentrate flow ratet/h711E
Solids specific gravitySp Gr4.24.2A6.1
Concentrate density (at cell lip), solidswt %2020B
Diluted concentrate density, solidswt %1515B
Diluted concentrate pulp flow ratem3/h3962E
Froth factor5.0B
9.2.4 Rougher Tailings (Final Copper Concentrate)
Mo content%0.050.05A6.3
Cu content%27.727.7A6.3
Solids flow ratet/h101132E
Solids specific gravitySp Gr4.24.2A6.1
Pulp percent solidswt %41.639 42B
Pulp flow ratem3/h167217E
Pulp pH8.58.0 9.0A6.2
Froth factor2.0B
9.3 1st Cleaner Flotation9.3.11st Cleaner Flotation Feed1st cleaner feed ratet/h1015E
Solids specific gravitySp Gr4.254.25E
Pulp percent solidswt %1515E
Pulp flow ratem3/h5791E
Pulp pH7.57.0 7.5A6.2
Froth factor3.0B
9.3.2 1st Cleaner Flotation Time and Machine Size
Flotation timemin2320A6.1
Effective cell volume factor%85B
1ST Cleaner cellsno.33E
TypeCovered conventionalA6.2
Sizem3ft38.5
300A6.2A6.2
Arrangement1 row of 3cells; 3E
9.3.3 1st Cleaner Concentrate
Mo content in concentrate%25.025.0A6.1
Mo recovery%8080A6.1
1st cleaner concentrate flow ratet/h46E
Solids specific gravitySp Gr4.44.4A6.1
Concentrate density (at cell lip), solidswt %1919B
Diluted concentrate density, solidswt %1717B
Diluted concentrate pulp flow ratem3/h2031E
Froth factor5.0B
9.3.4 1st Cleaner Tailings
Mo content%4.24.2E
Solids flow ratet/h69E
Solids specific gravitySp Gr4.24.2E
Pulp percent solidswt %1311 15B
Pulp flow ratem3/h4064E
Pulp pH7.57.0 8.0A6.2
Froth factor2.0B
9.4 2nd Cleaner Flotation9.4.12nd Cleaner Flotation Feed2nd cleaner feed ratet/h610E
Solids specific gravitySp Gr4.44.4E
Pulp percent solidswt %1717E
Pulp flow ratem3/h3252E
Pulp pH7.57.0 7.5A6.2
Froth factor3.0B
9.4.2 2nd Cleaner Flotation Time and Machine Size
Flotation timemin2722A6.1
Effective cell volume factor%85B
1ST Cleaner cellsno.22E
TypeCovered conventionalA6.2
Sizem3ft38.5
300A6.2
A6.2
Arrangement1 row of 2 cells; 2E
9.4.3 2nd Cleaner Concentrate
Mo content in concentrate%4040A6.1
Mo recovery%7070A6.1
2nd cleaner concentrate flow ratet/h3.15.0E
Solids specific gravitySp Gr4.44.4A6.1
Concentrate density (at cell lip), solidswt %1915 19B
Diluted concentrate density, solidswt %1712 17B
Diluted concentrate pulp flow ratem3/h1626E
Froth factor5.0B
9.4.4 2nd Cleaner Tailings
Mo content%1818E
Solids flow ratet/h35E
Solids specific gravitySp Gr4.44.35 4.4E
Pulp percent solidswt %1513 15B
Pulp flow ratem3/h1829E
Pulp pH7.57.0 8.0A6.2
Froth factor2.0B
9.5 Intermediate Concentrate Storage9.5.1 Storage Feed
Feed ratet/h3.15.0E
Solids specific gravitySp Gr4.44.4A6.1
Pulp percent solidswt %1712 17B
Pulp flow ratem3/h1626E
Pulp specific gravitySp Gr1.151.15E
Pulp pH7.57.0 8.0A6.2
9.5.2 Storage Tank
TypeClosed, agitated, pump dischargeA6.2
Number of tanksno.1C
Capacity (net)m3200A6.2
Tank size (dia x height)m6.6 x 6.6E
Retention time (based on 60% solids)h9E
Live Storage, range%35 to 85B
Pulp pH at discharge7.57.0 8.0A6.2
Froth factor1.2E
9.6 3rd Cleaner Flotation9.6.1 3rd Cleaner Flotation Feed3rd cleaner feed ratet/h3.15.0A6.3
Solids specific gravitySp Gr4.44.4E
Pulp percent solidswt %1717E
Pulp flow ratem3/h1626E
Pulp pH7.57.0 7.5A6.2
Froth factor3.0B
9.6.2 3rd Cleaner Cell
Superficial gas velocitycm/s1.1B
Carrying capacitytconc/h/m20.180.32A6.1
Mass loadingt/h/m20.72.7A6.2
Froth depthm0.6 0.7B
3rd Cleaner Cell
Type
Number
Size (dia)
AreaNo.m
m2Column
1
2.44.6A6.1BE
E
9.6.3 3rd Cleaner Concentrate
Mo content in concentrate%50.550.5A6.3
Mo recovery%33.233.2E
3rd cleaner concentrate flow ratet/h0.81.3A6.3
Solids specific gravitySp Gr4.54.5A6.1
Concentrate density (at cell lip), solidswt %1515B
Diluted concentrate density, solidswt %1212B
Diluted concentrate pulp flow ratem3/h6.310.0E
Froth factor5.0B
9.6.4 3rd Cleaner Tailings
Mo content%36.236.2E
Solids flow ratet/h2.33.7E
Solids specific gravitySp Gr4.374.35 4.4E
Pulp percent solidswt %1614 18B
Pulp flow ratem3/h1320E
Pulp pH7.57.0 8.0A6.2
Froth factor2.0B
10.0 MOLY CONCENTRATE DEWATERING10.1 Moly Concentrate Thickener10.1.1 Thickener FeedSolids flow ratet/h0.81.3A6.3
t/d1930A6.3
Solids specific gravitySp Gr4.54.5A6.1
Pulp percent solids()wt %10.910 12E
Pulp flow ratem3/h7.011.0E
Pulp specific gravitySp Gr1.101.10E
Pulp pH7.57.0 8.0A6.2
10.1.2 Moly Concentrate Thickener
Number of thickenersno.1B
Unit settling aream2/t/d6.01.0A6.1
Spray waterm3/h1020B
Thickener
TypeConventionalB
Size (dia)m12E,A6.2
Aream2113E
10.1.3 Moly Concentrate Thickener Underflow
Underflow percent solidswt %5050 55B
Underflow flow ratem3/h1.01.6E
Underflow pulp specific gravitySp Gr1.641.64 1.75E
10.1.4 Moly Concentrate Thickener Overflow
Overflow flow ratem3/h610E
10.2 Moly Concentrate Storage10.2.1 Moly Concentrate Storage Feed
Solids feed ratet/h0.81.3A6.3
Solids specific gravitySp Gr4.54.5A6.1
Pulp percent solidswt %5050 55B
Pulp flow ratem3/h1.01.6E
Pulp specific gravitySp Gr1.641.64 1.75E
Pulp pH7.57.0 8.0A6.2
10.2.2 Moly Concentrate Storage Tank
TypeClosed, agitated, pump dischargeA6.2
Number of tanksno.3C
Capacity (net)m317E
Tank size (dia x height)m2.7 x 3.0E
Retention time (based on 50% solids)d1.81.0A6.1
Live Storage, range%35 to 90B
10.3 Moly Concentrate Filter10.3.1 Filter FeedSolids flow ratet/d1930A6.3
Solids specific gravitySp Gr4.54.5A6.1
Pulp percent solidswt %5050 55B
Pulp flow rate()m3/h2.13.4E
Pulp specific gravitySp Gr1.641.64 1.75E
Pulp pH7.57.0 8.0A6.2
10.3.2 Moly Concentrate Filter
TypeVacuum DiscA
Number of filtersNo.1E
Filter cake moisture%1515 20B,D
Filtering ratet/h/m20.11A6.1
Filter capacityt/h3.0A6.2
Filtration aream226E
Number of discsNo.6 D
Disc diameterm1.8 D,A6.2
10.3.3 Filtrate
Filtrate flow ratem3/h1.43.0E
11.0 STORAGE AND LOADOUT
11.1 Moly Concentrate Dryer11.1.1 Dryer Feed
Solids feed ratet/h1.72.8E
Feed moisture%1515 20B,D
Dryer feed bulk densityt/m31.8 - 2.0B
Feed temperatureC15 20B
11.1.2 Moly Concentrate Dryer
Discharge moisture%43 to 5B
Moly Dryer
Type
Number
Size (screw dia)No.InTwin screw
1
TBDA6.1BD
Product bulk density
Wet with 4% moisture loose
Dry
Wet with 4% moisture compactedt/m3t/m3t/m31.44
1.36
1.76B
B
B
Specific heatkcal/kg/C0.20F
11.2 Concentrate Storage and LoadoutFinal Mo concentrate Storage
TypeBin with discharge activatorB
Numberno.1B
Capacityt12E,A6.2
Bag filling system
Capacityt/h3E
Numberno.1B
Bag capacitykg1 000 1 500A6.2
Bag storage locationAdjacent to moly plant;
7 days production (250 t)C
12.0 REAGENTS
12.1Sodium Hydrosulfide (NaHS)12.1.1Material Characteristics
FormLiquid, 30 42% aqueous solution by weightD
Chemical formulaNaHSF
Specific gravity at 20 C1.286D
Viscosity
at 25C (42% solution)
at 37C (42% solution)cP
cP8.1
7.0F
F
Flash pointCNoncombustibleF
Freezing point (42% solution)C17.2F
Last crystal point (30% solution)C0F
pH (42% solution)9 12F
ToxicityCan cause skin irritation and burns, harmful to eyes, releases H2S on contact with acidF
12.1.2Shipping Information
Shipping containerTank truckD
Container capacityL19 000D
UnloadingpumpedA
12.1.3Storage RequirementsNumber of storage tankno.2B
TypeLined, with heat tracer and vented with a vapor capture systemB
The storages tanks will supply both plants (existing and new)A
Tank capacity, net eachm3400E
Retention time @ 28% solutiond1512E
12.1.4Distribution
Distribution typeloop and daily tank with manifoldB
Circulating pumps
Number
Capacityno.m3/h2
10B
E
Daily tank capacity (new plant, net)m321E
Metering pumps
Number
Capacity, 2 at
Capacity, 6 atno.m3/h
m3/h80.6 1.50.1 0.4E
E
E
12.1.5Consumption
New Moly plant consumption
at 100% NaHS
at 42% NaHS (aq)
at 28% NaHS (aq)
at 28% NaHS (aq)kg/t conc.kg/d
L/d
L/d
m3/h3.8
8 85416 39327 500
1.24.5(Note 2)10 48519 41532 5651.4A
E
E
E
E
Existing Moly plant consumption (Note 1)
at 100% NaHS
at 42% NaHS (aq)
at 28% NaHS (aq)kg/t conc.kg/d
L/d
L/d3.8
6 09511 28518 9304.5(Note 2)7 22013 36522 420A
E
E
E
Total consumption at 28% NaHS (aq)L/d46 43054 985E
Distribution to (at 28% solution):
Rougher feed box (60%), 1 point at
Rougher transfer boxes (16%), 2 points at
1st Cleaner feed box (8%), 1 point at
2nd Cleaner feed box (8%), 1 point at
3rd Cleaner feed box (8%), 1 point at
Existing Moly plant (general)m3/h
m3/h
m3/h
m3/h
m3/h
m3/h0.9
0.1
0.1
0.1
0.1
1.0E
E
E
E
E
E
Note (1): NaHS facilities will feed both moly plants.
Note (2): only for design purposes
12.2 Diesel Oil12.2.1Material Characteristics
FormLiquidF
Specific gravity at 15 C0.825F
Viscosity at 20CcP32F
Flash pointC43 72F
Freezing pointC-40F
ToxicitySkin, eye and mucous membrane irritant and central nervous system depressant; ingestion may lead to aspiration pneumonitis.F
12.2.2Shipping Information
Shipping containerTank truckD
Container capacityL19 000D
UnloadingpumpedA
12.2.3Storage Requirements
Number of storage tankno.1B
Tank capacity (net)m340E
Supplyd15A6.2
12.2.4Distribution
Distribution typeLoopB
Circulating pumps
Number
Capacityno.m3/h2
7B
E
Metering pumps
Number
Capacityno.cm3/min3
10 150E
E
12.2.5Consumption
Moly plant consumption
As moly collector
For P-4000 dilutiong/t conc.
kg/d
L/d
L/d50(Note 1)1161401 435A
E
E
E
Distribution to:
Rougher feed conditioner, 1 point at
3rd Cleaner feed conditioner, 1 point at
P-4000 storage tankcm3/min
cm3/min
m3/h77261.0E
E
E
Note (1): only for design purposes12.3Sulfuric Acid12.3.1Material Characteristics
FormLiquidF
Chemical formulaH2SO4F
Strength%98D
Specific gravity at 20 C1.84D
Viscosity
at 0C
at 20CcP
cP60
24F
F
Flash pointCNonflammableF
ToxicityCan cause severe burns on contact with eyes and skin.F
12.3.2Shipping Information
Shipping containerTank truckD
Container capacityL12 000D
UnloadingPneumaticD
12.3.3Storage Requirements
Number of storage tankno.1B
Tank capacity (net)m370E
The storage tank will supply both plants (existing and new)
Supply, at nominal consumptiond15A6.2
UnloadingPumpingD
Unloading pumps
Number
Capacityno.
m3/h25E
E
12.3.4 Distribution
Number of daily tank (new plant)no.1B
Daily tank capacity (net)m36E
DistributionMetering pumpsB
Metering pumps
Number
Capacity, 2 at
Capacity, 4 atno.
L/min
L/min6
0.9 3.00.2 0.6E
E
E
12.3.5Consumption
Total consumption, new plantkg/t
kg/d
L/d1.8
4 1952 2803.6(Note 1)8 3904 560A
E
E
Total consumption, existing plant (Note 2)kg/t
kg/d
L/d1.8
2 8901 5703.6(Note 1)5 775
3 140A
E
E
Distribution to:
Rougher feed conditioner, 1 point at
Rougher feed box, 1 point at
First cleaner feed box, 1 point at
Second cleaner feed box, 1 point at
Existing moly plant, generalL/min
L/min
L/min
L/min
L/min1.00.20.2
0.2
1.12.00.3
0.5
0.5
2.2E
E
E
E
Note (1): only for design purposesNote (2): Sulfuric Acid facilities will feed both moly plants.
12.4P-400012.4.1Material Characteristics
FormLiquidF
Chemical type100% active poly/glycol foam control agentF
Specific gravity at 15 C1.005F
Viscosity
at 0C
at 37.8CcST
cST4 000
455F
F
Flash pointC185F
Freezing pointC-26F
ToxicityNontoxicF
12.4.2Shipping Information
Shipping containerDrumD
Container capacityL204D
UnloadingpumpingD
Unloading pumps
Number
Capacityno.m3/h1
1.5E
E
12.4.3Storage Requirements
Storage tank
Numberno.1B
Tank capacity (net)m312E
Supplyd5E
Unloading, 1 atm3/h5E
Day tank
Numberno.1B
Tank capacity (net)m35E
Supplyd1E
12.4.4Distribution
Distribution typeloopB
Circulating pumps
Number
Capacityno.m3/h2
5B
E
Metering pumps
Number
Capacityno.cm3/min515 150E
E
12.4.5Consumption
Total consumption
at 10% P-4000g/t
kg/d
L/d60
1401 575120(Note 1)2803 150B
E
E
Distribution to:
Rougher cells feed box, 1 point at
Rougher launder, 1 point at
1st Cleaner launder, 1 point at
Rougher concentrate box, 1 point at
Stand by, 1 point atcm3/min
cm3/mincm3/min
cm3/min
cm3/min150
150
150
150
150E
EE
E
E
Note (1): only for design purposes
13.0 ADDENDUM: MASS BALANCE
Includes 3rd cleaner concentrate and filtrate from moly filter.
Considers 50% availability.
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