What Steps do We have for the Selection Principles of Chrome Corundum

The main mineral composition of Chromium corundum is -Al2O3-Cr2O3 solid solution. The secondary mineral composition can be a little quantity of composite spinelle (or composite spinelle -free), along with the refractory bricks whose chromium oxide content material is 1% ~ 30%. There are two kinds: cast chrome corundum brick and sintered corundum brick.

Generally, the chromium corundum brick refers towards the sintered chrome corundum brick. It uses |¨¢-Al2O3 as raw material, being added the best amount of chromium oxide powder and fine powder of Chromium corundum clinker, right after getting molded and burnt at high temperature. Chromium oxide content of sintered chrome brick is typically lower than that on the cast chrome corundum brick. It is possible to also use mud casting technique to possess a preparation, uniformly mixing alpha-Al2O3 powder and chromium oxide powder, adding remedy adhesive agent and organic bonding agent to produce thick mud, even though adding some chromium corundum clinker, employing grouting technique to make unfired bricks and burn them. It can be used because the glass furnace lining, plate brick of wire drawing glass flow liquid hole cover and utilized for hot metal pretreatment device, garbage incinerator, coal slurry pressurized gasification furnace backing, and so forth.

What measures do we have for the selection principles of chrome corundum?

1. Simple Refractory uses magnesium Oxide and calcium oxide as the major components, what's commonly employed is magnesium brick. Magnesia brick containing Magnesium Oxide greater than 80% to 85%, obtaining excellent resistance on the simple slag and iron slag, whose refractoriness is higher than that of clay brick and silica brick, is mainly used in open hearth furnace, oxygen converter, electric furnace, non-ferrous metal smelting gear and high temperature gear.

2. Neutral refractory materials use aluminum oxide, chromium oxide or carbon as primary ingredients. Alumina items containing greater than 95% of alumina are a sort of top quality refractory supplies. Chrome brick employing chromium oxide as the principal component has excellent corrosion resistance to steel slag, but the poor heat shock resistance, reduced high temperature load deformation temperature. Carbonaceous refractory has carbon brick, graphite and silicon carbide items, whose coefficient of thermal expansion is quite low, obtaining higher thermal conductivity, heat vibration overall performance, high strength at higher temperature, acid and alkali and salt corrosion, without any wetting from metal and slag, and soft lightweight. It?¡¥s broadly used as a high-temperature furnace lining materials, as well as petroleum, chemical lined autoclave.

3. Acid refractory material utilizes silicon oxide because the principal component and what we commonly use is silica brick and clay brick. Silica brick is siliceous merchandise containing silicon oxide above 93%, as well as the used material is silica stone, waste silica brick and so on, whose anti-acid slag includes a sturdy erosion ability, high load softening temperature, and whose volume will not shrink soon after repeated calcination, as well as a slight expansion.; but it?¡¥s vulnerable to the erosion of simple slag, having a poor thermal shock resistance. The silica brick is mainly used in the thermal gear including coke oven, glass furnace, acid furnace and so forth. Clay brick uses refractory clay because the primary raw material, containing 30% to 46% alumina, and belongs to a weak acid refractory and fine heat shock resistance, obtaining a corrosion resistance against acid slag, so it has a wide selection of applications.

4. In specific occasions, the utilized chrome corundum has higher temperature oxide supplies, like alumina, lanthanum oxide, beryllium oxide, calcium oxide, zirconia, etc., and a few refractory compounds, for example carbides, nitrides, borides, silicides and sulfides; and higher temperature composite components, such as metal ceramic, high temperature inorganic coatings and fiber reinforced ceramics. Normally in the market place, we can typically see Cr2O3?¡éCr2O3 compound, sometimes even Cr2O3 99% and Chrome Oxide Green Powder.