电子级高纯钛酸钡的生产

Production of electronic-grade high purity barium titanate

钛酸钡具有优良的电学性能,广泛应用于各种电子领域。以四氯化钛、氯化钡和草酸为原料,制备了电子级高纯钛酸钡粉体。具体制备过程：将四氯化钛在盐酸中低温水解制得稳定的二氯氧钛溶液,然后与经重结晶和除铁的氯化钡溶液混合,混合液以一定速度加入到精制的草酸溶液中,制得草酸氧钛钡沉淀,沉淀经过滤、洗涤,滤饼经煅烧制得钛酸钡成品。最佳制备条件：氯化钡与四氯化钛与草酸物质的量比为（1.03~1.05）∶1∶1.1,反应温度为60~70℃,煅烧温度为800℃,煅烧时间为2 h。所得产品纯度高,粒径小、分布均匀,具有优良的电学性能。

Barium titanate has excellent electrical properties,which is widely used in various electronic fields.Electro-nic grade high purity barium titanate was prepared with titanium tetrachloride,barium chloride,and oxalic acid as raw mate-rials.Specific preparation process is as follows： stable titanium oxide dichloride solution was obtained at first through the hydrolysis of titanium tetrachloride in hydrochloric acid at low temperature,and then barium chloride solution,which had been recrystallized and iron-removed was mixed;the mixture solution was added to refined oxalic acid solution at a certain speed;then the precipitation barium titanyl oxalate was obtained;through filtration and washing,the filtrate cake was calcined and barium titanate finished product could be obtained.Optimum preparation conditions：amount-of-substance ratio of barium chloride to titanium tetrachloride and to oxalic acid was（1.03~1.05） ∶ 1∶1.1;reaction temperature was at 60~70 ℃,calcination temperature was 800 ℃,and calcination time was 2 h.Final product had excellent electrical properties with high purity,small particle size,and even distribution under the above mentioned conditions.