Blasting Media Olivine

Natural mineral


Blasting Materials distributed by GritSablare are characterized by outstanding quality. This quality is reflected in an above-average service life, a very high productivity and value retention.


  • Highly refractory with very high melting point. Is the first mineral to crystallise from a mafic magma. Olivine’s physical characteristics make it appropriate for use in many high temperature applications.
  • Uses: Eccentric bottom tapping (EBT) taphole filler slag conditioning refractory bricks / castables / tundish linings blasting abrasive foundry sand fluidised bed combustion (FBC) CO2 sequestration (combined with Mg) fertiliser / soil amendment water purification mineral wool production.
Ecological Product
No free silica

Product available on order

  • Blasting
    1 - 3 mm • Sieve Analysis »
    1 - 2 mm • Sieve Analysis »
  • Eccentric bottom tapping (EBT)
    3 - 8 mm
    2 - 7 mm
    1 - 5 mm
  • Crude olivine
    5 - 50 cm
  • Slag conditioner
    10 - 40 mm
    7 - 40mm
  • Foundry
    AFS 45-50
    AFS 65
  • Casting
    01 - 1 mm
    0 - 05 mm
    0 - 02 mm
  • Big Bags of 1000 Kg
  • Bags of 25 Kg (Moisture Proof Paper Bags)
  • The material must be stored in a dry place.

Olivine Description

Crystallised grains of olivine in magma
Crystallised grains of olivine in magma
  • Olivine is an ultrabasic mineral, with no free silica content. Grey/green odourless solid, insoluble in water. Olivine is a group name covering a family of solid solutions of iron and magnesium silicates of indefinite composition. It is a natural occurring mineral, consisting mainly of a solid solution of Forsterite (magnesium rich member) & Fayalite (iron rich member). The mineral is mined by an open cut method, crushed, milled, screened, cleaned via a complex suction system and stored in various product silos depending on its sizes;
  • Olivine has a high melting point and is the first mineral to crystallise from a mafic magma. Forsterite crystallises first with Fayalite crystallising last when other minerals are just beginning to form. The early crystallisation of olivine is the reason that molten lavas can contain already crystallised grains of olivine. Olivine’s physical characteristics make it appropriate for use in many high temperature applications, such as EBT taphole sand and refractory bricks.

Olivine Types

Olivine Application

Eccentric bottom tapping (EBT) taphole filler
Eccentric bottom tapping (EBT) taphole filler

Scrap metal is melted in an electric arc furnace with Eccentric bottom tapping (EBT) at extremely high temperatures. Melted steel is tapped out through a nozzle in the bottom of the furnace. A very tough material is necessary to fill the nozzle to avoid slag problems. Only a superior product like Olivine is able to perform the dual service of (1) holding the molten metal at bay until it reaches its full temperature without metal penetration into the nozzle, and then (2) releasing cleanly and quickly to facilitate complete flow.

Olivine provided by GritSablare has unique chemical composition that enables it to maintain heat resistance up to 1780 °C - a temperature much higher than the temperature inside the furnace. Further, precise dimensions, shape and angular configuration of Olivine particles provide compaction properties which resist metal penetration.

When the molten metal reaches its optimum consistency, the nozzle is opened and Olivine pops through, allowing metal to flow. The nozzle does not freeze, making Olivine the perfect material to fill the nozzle in any EBT furnace.

Slag conditioning
Slag conditioning
Slag conditioning
  • Olivine is suitable for applications in both blast furnaces and electric arc furnaces for the conditioning of furnace slag and provision of basicity control. It is added in any of 3 forms with the following benefits:
    • Lump, added directly into the furnace. In this form olivine can replace some of the limestone and dolomite that is usually used as a flux in the reduction of iron ore. This is because olivine’s high MgO content, which has an average of 45-49% towards dolomite’s 20-22% with the consequence that a lower tonnage of material is required to achieve the predetermined MgO concentration in the furnace;
    • Sinter. Olive can also be applied as a component directly to sinter stream. In this way inclusion of olive can reduce the sintering temperature by up to 100ºC which in turn leads to a tougher sinter, with fewer fines requiring recycling. The ultimate impact of these factors is that the overall capacity of the furnace is raised by as much as 15%.
    • Pellets. Olivine can also be added directly to the iron ore as a flux during the formation of pellets with positive effects on the overall heat efficiency of the process.

Other uses of Olivine

With an initial temperature of 1450ºC and fusion at 1665-1743ºC, olivine is well suited as a refractory. Olivine sand is used as a raw material for bonded forsterite bricks, for storage heaters and refractory monolithics and mortars. Further, in furnace construction, olivine has a major advantage as it does not react chemically with steel.

Molding sand for metal casting
Molding sand for metal casting
In certain metal works, such as manganese steel, brass, bronze and aluminium foundries, olivine remains the premier choice as molding sand. Olivine sand is easy to work with and can be recycled and re-used without difficulty. It is ideal for the casting of manganese steel and for non-ferrous castings because it produces a clean surface which requires a minimum amount of finishing. Moreover operators are not exposed to any health risk by handling olivine sand on a daily basis.

Blasting material
Blasting material
Olivine is widely used as an abrasive material in the blast cleaning industry. There is a range of logical for its usage such as high specific gravity, angularity of grains, high degree of hardness, environmentally friendliness and the health-safety aspects of the operators. Unlike quartz, olivine sand does not contain crystalline quartz.

Physical and Chemical Properties

Physical Properties
Appearance: Solid
Color: Grey/green
Shape particle: Angular
Odor: None
Density: 3,2 g/cm3
Hardness: 6,5 – 7 Mohs scale
Melting point (°C): Approx. 1780 °C
Initial sintering (°C): Approx. 1450 °C
pH: 7,5 – 8
Solubility in water (g/L): Immiscible
Chemical Composition
MgO: 45 - 48%
SiO2: 40 - 44%
Fe2O3: 7 - 9%
Al2O3: 1 - 1,5%
CaO: 0,65 - 1%
Lost on ignition: max 1,5%
Ore composition
Forsterite Mg2SiO4: 96%
Fayalite Fe2SiO4: 4%
Ecological Product
All tests made on the olivine categorized the product as ecological. All the analyzed parameters scored below the toxicity levels imposed by the legislation.
For what area of activity do you need Olivine?


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