Chromium Corundum Raw Materials

详情

Introduction
Chromium Corundum Raw Materials (also called Chrome Corundum Material), Chromium corundum (Pink Fused Alumina, Pink Fused Aluminium 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 *8%, and there is about 0.7% chromium oxide (Cr₂O₃) and 0.3% Na₂O. Chromium corundum is an excellent abrasive with a wide range of applications due to 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, capable of forming high-melting compounds with various oxides. For example, Cr₂O₃ and Al₂O₃ can form a continuous solid solution with a melting point above ***0 °C; Cr₂O₃ and MgO/FeO form a high melting point magnesia-chromium spinel/ferrochrome spinel; Cr₂O₃ and Cu₂O can form a compound with a melting point above ***0 °C; the melting temperature of the eutectic formed by Cr₂O₃ and SiO₂ reaches ***0℃, etc.
 
Chromium corundum is a product made by reducing Cr₂O₃ with pure alumina. It is equivalent to a composite refractory made by adding more than *0% pure Cr₂O₃ to melted pure corundum (or white corundum). Due to the high content of Cr₂O₃ and its binding to the corundum matrix, it is called chromium corundum. Chromium corundum undergoes high-temperature smelting above ***0°C in the production process, resulting in a more uniform composition due to its good thermal stability and high-temperature chemical stability.
 
The high density of chromium corundum is the key factor in improving the lining life. After melting, the solidified chromium corundum block has small porosity, so the key part of the furnace body is built with chromium corundum, and the gaps in the bricks are filled with chromium corundum powder and binder.
 
Features

• High refractoriness, high softening temperature under load, and low creep rate at high temperature.
• Stability under a strong reducing atmosphere.
• Strong resistance to molten ash corrosion.
• Higher high-temperature strength and erosion resistance.
• Good thermal shock stability.