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Olivine

Formula: (Mg,Fe)2SiO4

OxideAnalysisFormula
CaO0.35%0.005
MgO47.65%0.995
Al2O30.80%0.007
SiO241.35%0.579
Cr2O30.25%0.001
Fe2O38.00%0.042
NiO0.35%0.004
LOI1.25
Oxide Weight83.08
Formula Weight84.13
If this formula is not unified correctly please contact us.
DENS - Density (Specific Gravity) 3.3
HMOH - Hardness (Moh) 6.5-7
COLE - Co-efficient of Linear Expansion 0.0083 in./in. per F
GSPT - Frit Softening Point 2800-3200F
BDLB - Bulk Density lbs/cu. ft. (Packed) 90-110
SLBY - Solubility Soluble in HNO

Olivine is refractory, inert, hydration free mineral produced from intrusive or effusive volcanic rocks (e.g. Forsterite Mg2SiO4, Fayalite Fe2SiO4 (Mg, Fe)2SiO4.
It has a low degree of thermal dilation. The density and solubility increase and the melting point decreases with increasing iron content.
Olivine requires no calcination prior to use. Also similar are willemite, tephroite, and crisoberite.

Olivine has good insulating properties and high resistance to alkaline oxides, sulphates, carbonates and halides and is excellent for use in resin bonded brick, ramming, gunning and sprayable refractories. It is also a cost effective source of MgO in refractories.

The absence of free silica eliminates temperature inversion to produce creep resistance equal to or better than bauxite, corundum and andalusite-based refractories.

Rock with high olivine and low iron content are used mainly in iron metallurgy as foundry sands. The olivine is added to the blast furnace with iron mineral and coke. It binds to the iron impurities to create slag and increases the fluidity of the molten material. Thanks to its basicity and good refractory qualities (better than those of the more commonly used silica sands), olivine sand is used for special smelting such as stainless and manganese steel. The refractory industry uses olivine in the manufacture of formed and non-formed basic products (sprayed masses and granules) used mainly in iron metallurgy.

Olivine is used for sandblasting because of its absence of free silica even in the finest fractions.

Olivine is available in a wide range of sizes from granular to 325 mesh.


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By Tony Hansen

XML for Import into INSIGHT

<?xml version="1.0" encoding="UTF-8"?> <material name="Olivine" descrip="" searchkey="" loi="0.00" casnumber=""> <oxides> <oxide symbol="CaO" name="Calcium Oxide, Calcia" status="" percent="0.350" tolerance=""/> <oxide symbol="MgO" name="Magnesium Oxide, Magnesia" status="" percent="47.650" tolerance=""/> <oxide symbol="Al2O3" name="Aluminum Oxide, Alumina" status="" percent="0.800" tolerance=""/> <oxide symbol="SiO2" name="Silicon Dioxide, Silica" status="" percent="41.350" tolerance=""/> <oxide symbol="Cr2O3" name="Chrome Oxide" status="" percent="0.250" tolerance=""/> <oxide symbol="Fe2O3" name="Iron Oxide, Ferric Oxide" status="" percent="8.000" tolerance=""/> <oxide symbol="NiO" name="Nickel Oxide" status="" percent="0.350" tolerance=""/> </oxides> <volatiles> <volatile symbol="LOI" name="Loss on Ignition" percent="1.250" tolerance=""/> </volatiles> </material>


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