Chromium Corundum Raw Materials

Chromium corundum raw materials (also called chrome corundum material), chromium corundum (pink fused alumina, pink fused aluminum oxide, chromium aluminum oxide) is a pink / rose abrasive made of high-purity alumina and a proper amount of chromium oxide in an arc furnace. The content of alumina (Al₂O₃) is more than 98%, and there are about 0.7% chromium oxide (Cr₂O₃) and 0.3% Na₂O. Chromium corundum is a kind of excellent abrasive with wide application because of its high hardness, good toughness, good self-sharpness, high cutting finish, low magnetic content, concentrated particle size, and pure content.

Compared with pure white corundum, Cr₂O₃ is a high-quality component of refractory materials, which can form high-melting compounds with various oxides. For example, Cr₂O₃ and Al₂O₃ can form a continuous solid solution, the melting point of this solid solution is above 2050 °C; Cr₂O₃ and MgO/FeO form a high melting point magnesia-chromium spinel/ferrochrome spinel; Cr₂O₃ and Cu₂O can form a melting point above 1600 °C The compound; the melting temperature of the eutectic formed by Cr₂O₃ and SiO₂ reaches 1720℃; etc.

Chromium corundum is a product made by reducing Cr₂O₃ with pure alumina. it is equivalent to a composite refractory made of pure corundum (or white corundum) melted by adding more than 10% pure Cr₂O₃. Because of the high content of Cr₂O₃ and its binding to the corundum matrix, it is called chromium corundum. Chromium corundum has to go through high-temperature smelting above 2000°C in the production process, and its composition is more uniform because of its good thermal stability and high-temperature chemical stability.

The high density of chromium corundum is the key factor to improve the lining life. After melting, the porosity of the solidified chromium corundum block is small, so the key part of the furnace body is built of chromium corundum, and the gap of the brick is filled with chromium corundum powder and binder.