Titanium oxide-containing aluminum oxide particles based on corundum melted in an electric arc furnace from calcined alumina, and a method for the production thereof

A method for producing titanium oxide-containing aluminum oxide particles based on corundum melted in an electric arc furnace from alumina, comprising:

• melting a mixture of Al2O3, TiO2, SiO2, and Fe2O3 containing raw materials in the presence of iron filings and charcoal in the electric light arc furnace,
• cooling the melted mixture to obtain a solid block, which consists substantially of corundum, and
• comminuting and processing of the corundum block into defined particle size distributions, wherein raw materials, which contain small quantities of contaminations, are thereby used as raw materials, wherein the raw materials are selected from the group consisting of calcined alumina, rutile, ilmenite, and iron ore in such quantities that titanium oxide-containing aluminum oxide particles comprise the chemical composition
• Al2O3 less than 97.0% by weight,
• Fe2O3 0.05% by weight to 0.2% by weight,
• SiO2 0.1% by weight to 0.5% by weight,
• TiO2 1.3% by weight to 1.8% by weight,
• ZrO2 0.02% by weight to 0.1% by weight,
• Na2O 0.05% by weight 2.0% by weight, and
• other oxides less than 0.2% by weight,
• and an arithmetic mean compactness of less than 0.8 are formed, wherein compactness is solidity (S), which is determined via image analyzing software and which is defined as a ratio of actual particle surface (A) to convex particle surface (B).