Andalusite is an alumina-silicate raw material used principally in the manufacture of heat resistant refractory products. When andalusite is produced, unlike many other refractory raw materials, costly calcining is not required. On firing refractory raw materials containing andalusite, high strength mullite is formed, resulting in the superior qualities of.
a) Andalusite conversion to mullite at relatively low temperatures, imparting high hot strength and resistance to physical-chemical erosion, with very good resistance to slag penetration and alkali attack.
b) Minimum volume change when firing andalusite - containing refractory materials; dimension control of the refractory is improves.
c) High creep and abrasion resistance, high strength at high temperatures, resistance to chemical and physical erosion.
d) The very low volume change on firing is also advantageous when andalusite is used in monolithic refractories.
e) Resistance to attack and penetration by slag and gases.
f) The low flux content helps the resistance to slags and alkalies.
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Application Areas;
Andalusite-based refractories are used principally in iron and steel making, mostly in monolithic linings in blast furnaces, stove brick and checkers, torpedo transfer, hot metal mixers, casting ladles, and induction furnaces, Andalusite shapes are used in cement kilns, the glass industry, in and in induction furnaces. Andalusite refractories are also used effectively under abrasive conditions where high loads and high temperatures exist Also in stack linings and kiln furniture, monolithic castable linings, ramming mixes and heat exchangers, heat treatment furnaces. While andalusite consumption in the Western Hemisphere has traditionally been at a low level, because of restricted availability, industrial furnaces in the world have now the opportunity to reduce costs by effectively utilizing a world class andalusite. Typical physical / chemical characteristics of the our andalusite are 59% Al2O3 and Fe2O3 0.80%. Contact our company for other technical specifications.
Refractory Industry; There are many benefits of using andalusite in refractory applications. Volume stability, Very good creep resistance and refractoriness under load, High thermal shock resistance, Good chemical attack, slag and metal penetration resistance.
Casting Industry; In the modern sand casting process, andaluzite-based special sands are used to increase casting quality and reduce the risk of defects. Due to its low thermal expansion and high refractoriness, Andalusite is the ideal solution for iron and steel casting without veins and finishes.
Ceramic Industry; Andalusite is a natural source of alumina and mullite that can be profitably used when the physical and chemical properties of your ceramic material support need to be better controlled. Due to its high purity and very fine particle size distribution, micronized andalusite is an efficient and economical alternative to zircon silica as opacifier for glazes and engobes.
Furnace Furniture Industry; Andalusite thermal shock resistance, volume stability and high temperature load resistance uniquely combine in this naturally occurring crystal