用电熔氧化锆制备氧氯化锆的实验研究

Experimental Research on Preparation of Zirconium Oxychloride from Fused Zirconia

以电熔氧化锆为原料,采用一酸一碱法制备氧氯化锆,考察了电熔氧化锆与氢氧化钠配比、碱熔温度、碱熔时间对碱熔锆转化率的影响。结果表明,碱熔最佳工艺条件为:电熔氧化锆与氢氧化钠质量比1∶1,碱熔温度790℃,碱熔时间1.5h。采用该方法制备的氧氯化锆主品位达到36.25%,Zr回收率达91%,Na2SiO3耗量减少了98%以上,碱耗可降低52%。

Zirconium oxychloride was prepared from fused zirconia with the acid-alkali method. The effects were studied of fused zirconia-sodium hydroxide proportion, alkali fusion temperature and alkali fusion time on the conversion rate of zirconium during alkali fusion. The results show that the optimum conditions for alkali fusion are as follows ： mass ratio of fused zirconia to sodium hydroxide 1 ： 1,alkali fusion temperature 790 ℃ and alkali fusion time 1.5 h. Zirconium oxychloride prepared with the above method has a main grade of 36. 25%, Zr recovery rate reaches 91% ,Na2SiO3consumption reduces by more than 98% ,and alkali consumption can be reduced by 52%.