高纯超细氧化铝粉末的制备(Ⅰ)——氧化铝粉纯度的控制

Preparation of high purity ultrafine aluminum oxide(Ⅰ) -controlling the purity of aluminum oxide powder

对制备高纯氧化铝粉末过程中杂质的行为进行了分析 ,对采用有机试剂 A屏蔽 Fe3 +除铁进行了理论分析 .试验证明该屏蔽剂可很好地避免 Fe3 + 在中和过程中进入沉淀 ;添加 B可沉淀铅、锌等杂质 ;通过洗涤、煅烧能够有效除去钠 .制得的高纯氧化铝杂质含量 (w/ % ) :Fe0 .0 0 15 ,Si<0 .0 0 0 5 ,Cu 0 .0 0 0

The behavior of impurity was analyzed in the process of preparation of high purity, ultrafine aluminum oxide. Complexing Fe 3+ with organic agent A to remove Fe was analyzed theoretically. The experiment indicates that the agent A can avoid Fe\+\{3+\} into the preci\| pitates, the agent B can make the impurity of Pb, Zn, etc.precipitate, and sodium is removed by washing and calination. The produced high\|purity aluminum oxide cantains Fe 0\^0015%, Si<0.0005% and Cu 0.0001%.