Imexsar Supplier of Dense Medium Ferrosilicon to the Mining

and Recycling Industries

www.imexsar.com

e-mail: info@imexsar.com Tel: +27 (0) 11 954 1785 Mobile: +27 (0) 79 692 8229 Website: www.imexsar.com

About Imexsar

Imexsar (Pty) Ltd was founded in 2012. It is a South African based company with global relationships and a specialized knowledge of the dense medium ferrosilicon industry. Imexsar is ideally positioned to supply the mining and recycling industries with quality dense medium ferrosilicon. Key drivers of our success are: • consistent quality products, • logistics expertise, • product application knowledge ,and • understanding of our clients needs The Imexsar team has over 12 year’s experience in the marketing, distribution and technical support of dense medium ferrosilicon.

About Dense Medium Ferrosilicon

Dense Medium Ferrosilicon suspensions are commonly used in heavy medium separation processes, where separation is achieved on the basis of the relative density difference between the materials desired to be separated. The physical characteristics of the ferrosilicon powder play an important role in achieving the desired properties of the suspension, thereby ensuring that separation targets are met. Present dense medium plants use a suspension of a dense powder mixed with water, to act as an artificial “dense liquid“, and the mineral particles are separated in a sink-float process. Ferrosilicon powders with a relative density of 6.7-7.1, containing 14-16% silicon, are commonly used as the dense powder in mineral processing plants. It is essential to select the correct grade of ferrosilicon for a dense medium plant during the design phase, or when the plant is being optimized. Imexsar supplies a wide range of ferrosilicon grades, for varying applications. The different grades have different physical properties, which determine in-circuit behavior. These properties should be correctly matched to the type of dense medium process being used, and the nature of the separation being attempted. The more important properties of the dense suspension, or medium, are density, viscosity and stability. They are all interrelated. These properties are in turn determined by the physical properties of the ferrosilicon powder itself, such as particle shape and particle size distribution. It is these properties which are carefully controlled in the manufacturing process, and which can be varied to provide a range of products to suit different applications.

Medium Density is the concentration of ferrosilicon solids in the medium. Medium density is increased by adding more ferrosilicon solids, and reduced by adding water. Medium density will determine at which density the separation will take place.

Medium Viscosity is a measure of the medium's resistance to flow. Viscosity is determined by the concentration, shape and size distribution of the solids making up the medium. For dense medium separation processes, a low medium viscosity is desired. High viscosities result in increased chance of particle misplacement and hence reduced separation efficiency. Medium Stability is the propensity of the medium solids to settle out. As the relative density of the solids is higher than water, the medium is inherently unstable. The inverse of the rate at which the medium solids settle out under gravity is a measure of the medium's stability. Generally a stable medium is desired. Unstable media will settle in pipes and pumps, while density gradients can occur in the separators, impairing separation efficiency.

Rheology

Header tank

Correct and dilute medium

Floats

e-mail: technical@imexsar.com

Logistics: Imexsar is a registered importer and exporter with logistics capability to deliver globally. Specialist third party logistics companies are contracted to ensure product arrives timeously. Products are containerized for export shipments and shipped via closest port to destination country. Land based cargo are loaded on flat-bed trucks to be delivered to clients’ premises.

Atomized Ferrosilicon: Coarse, Fine, Intermediate, Cyclone 60, Cyclone 40

Milled Ferrosilicon: 65D, 100D, 150D, 270D, 270F

Strict quality control procedure ensures technical compliance to our specifications, ensuring the following properties are exhibited when used: • Required specific gravity can be achieved • Corrosion resistance • Abrasion resistance • Magnetic properties allowing easy recovery and de-magnetization • Cost effective Each melt is sampled and tested for correct chemical analyses. Final product is sampled and tested. A batch number is allocated to ensure traceability. Samples of the products have also been tested and verified by independent South African laboratories.

Our Products

Atomized Ferrosilicon

Chemical Properties

Fe, % 80 min

Si, % 14 – 16

Mn, % 0.8 max

Cr, % 0.6 max

Physical Properties

Pycnometric Density,

g/cm3

6.7 – 7.1

Non-magnetics, % 0.5 max

Magnetic Susceptibility, % 58 min

Size Distribution, micron

Grade Code Passing 45 micron, %

Imexil Coarse IMXRC 32 - 42

Imexil Fine IMXRF 42 – 50

Imexil Extra Fine IMXRXF 53 - 65

Imexil Cyclone 60 IMXRC60 68 – 78

Imexil Cyclone 40 IMXRC40 82 - 90

Atomized ferrosilicon is produced in an induction furnace by melting 72% ferrosilicon with high grade plate steel. High-pressure water atomization results in a fine particle distribution, which is screened and classified according to grade.

Milled Ferrosilicon

Chemical Properties

Fe, % 80 min

Si, % 14 – 16

Mn, % 0.8 max

Cr, % 0.6 max

Physical Properties

Pycnometric Density,

g/cm3

6.7 – 7.1

Non-magnetics, % 1.5 max

Magnetic Susceptibility, % 58 min

Size Distribution, micron

Grade Code Passing 45 micron, %

Imexil 65D IMXR-65D 47 – 55

Imexil 100D IMXR-100D 61 – 69

Imexil 150D IMXR-150D 73 – 81

Imexil 270D IMXR-270D 85 – 93

Imexil 270F IMXR-270F 90 - 95

Milled ferrosilicon is produced in a two-step process comprising melting and milling. Melting takes place in an induction furnace, where 72% ferrosilicon and high grade plate steel are combined. The hot metal are coarse atomized and cooled. After cooling, the material is milled, screened and classified into the correct grade.

Tel: +27 11 954 1785

Mobile: +27 79 692 8229

e-mail: enquiries@imexsar.com

Pvt Bag X2, Unit 127, Rant-en-dal, 1751, Mogale City, South Africa