Semi-friable alumina abrasive and preparation method thereof

The invention provides a semi-friable alumina abrasive and a preparation method thereof. The semi-friable alumina abrasive comprises, by mass, above 97% of Al2O3, 1.3-2.1% of TiO2, 0.2-0.4% of SiO2, 0.09-0.35% of Fe2O3 and 0.15% or less of ZrO2. The preparation method of the semi-friable alumina abrasive comprises the following steps: smelting raw materials including bauxite in the presence of iron filings and anthracite; and cooling and crushing the obtained smelted mixture to obtain the semi-friable alumina abrasive. The semi-friable alumina abrasive prepared in the invention has the advantages of high durability, high grinding ratio, high processing efficiency, good processing surface quality and excellent grinding effect. 本发明提供了种半脆刚玉磨料及其制备方法。本发明的半脆刚玉磨料的组成以质量含量计包括：AlO>97％，TiO1.3-2.1％，SiO0.2-0.4％，FeO0.09-0.35％，ZrO≤0.15％；上述半脆刚玉磨料的制备方法包括：在铁屑和无烟煤存在下，对包括铝矾土的原料进行熔炼；对熔炼后的混合物进行冷却、粉碎，得到半脆刚玉磨料。本发明制备的半脆刚玉磨料耐用度、磨削比及加工效率高，加工表面质量好，磨削效果优异。