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Henan Split to introduce general and special refractory material commonly used varieties

source:Henan Lite Refractory Material Co.,Ltd  date:2015-01-07  number: Secondary

°°°°Acidic Refractories

°°°°There is a larger amount of brick and clay. Silica brick is containing more than 93% SiO2 siliceous products, raw materials used are silica, silica brick scrap, etc. Acid resistant brick slag erosion ability, but are vulnerable to erosion of basic slag, its high load softening temperature, close to its refractoriness, the volume does not shrink after repeated firing, and even a slight expansion, but the anti-refractory abrasive

°°°°Poor thermal shock resistance. Mainly used silica brick oven, glass melting furnaces, furnaces and other acidic thermal equipment. Clay containing 30% to 46% alumina, which is the main raw material in refractory clay, refractoriness 1580 ~ 1770 °ś, good thermal shock resistance, is a weak acid refractories, acidic slag has corrosion resistance, widely used, the current production capacity is the largest class of refractories.

°°°°Neutral Refractories

°°°°High aluminum products in the main phase is mullite and corundum, alumina content increases with increasing alumina content and containing more than 95% of alumina corundum products is a wider use of high quality refractory materials. Chrome brick mainly chrome ore as raw material, the main phase is chromite. It slag corrosion resistance, but poor thermal shock resistance, high temperature and low load deformation temperature. Chrome ore and magnesite in different proportions chrome brick made good thermal shock resistance, mainly used as a basic flat roof tiles. Carbon neutral refractory products is another, according to the carbonaceous feedstock composition and mineral products, divided into carbon bricks, graphite products and silicon carbide products categories. Carbon brick with high-grade petroleum coke as raw materials, plus tar, bitumen as a binder, isolated in 1300 °ś under air firing conditions. Graphite products (In addition to natural graphite outer) by 2500 ~ 2800 °ś graphitized carbonaceous material obtained in an electric furnace. Places carbide as the raw material of silicon carbide products, plus clays, binders such as silica calcined at 1350 ~ 1400 °ś. Silicon carbide, silicon powder can also be added under a nitrogen atmosphere in an electric furnace made of silicon - silicon carbide products. Refractory Abrasives coefficient of thermal expansion of low carbon products, high thermal conductivity, good thermal shock resistance, high temperature strength. Long-term use at high temperatures do not soften, without any acid-base erosion, good salt tolerance, but also from the metal and slag wetting, lightweight, high-quality high-temperature materials. The disadvantage is easily oxidized at high temperatures, should not be used in an oxidizing atmosphere. Carbonaceous products are widely used in high-temperature furnace lining (hearth, hearth, the lower part of the furnace body, etc.), non-ferrous metal smelting furnace lining. Graphite products can make a reaction tank and petrochemical lined autoclave. Silicon carbide and graphite products can also be made with gold and copper smelting crucible of light alloys.

°°°°Basic Refractories

°°°°With magnesia products represented. It contains magnesium more than 80% to 85%, with periclase main crystal phase. The main raw material for the production of magnesite brick, magnesite seawater extracted from seawater by high temperature calcination of magnesium hydroxide), etc. Alkaline slag and iron slag has good resistance. The melting point of pure magnesium oxide up to 2800 °ś, therefore, brick clay and brick refractoriness are relatively high. Since the mid-1950s, the use of open hearth furnace and basic oxygen converter steel roof, basic refractories production gradually increasing the use of, clay and brick production is in decline. Mainly for basic refractories open hearth, basic oxygen furnace, electric furnace, non-ferrous smelting and some hot thermal equipment.

°°°°Oxide materials

°°°°Such as alumina, lanthanum oxide, beryllium oxide, calcium oxide, zirconium oxide, uranium oxide, magnesium oxide, thorium oxide, cerium oxide and the like melting point 2050 ~ 3050 °ś.

°°°°Refractory material compound

°°°°Such as carbides (silicon carbide, titanium carbide, tantalum carbide, etc.), nitrides (boron nitride, silicon nitride), borides (zirconium boride, titanium boride, hafnium boride, etc.), silicide (disilicide molybdenum, etc.), and sulfides (sulfide thorium, cerium sulfide, etc.). Their melting point is 2000 ~ 3887 °ś, which is the most difficult to melt carbide.

°°°°High-temperature composite materials

°°°°Such as metal ceramics, high temperature inorganic coatings and fiber-reinforced ceramics.

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