基于响应曲面法的含锆废盐中ZrO_(2)的回收工艺

Recovery of ZrO_(2) from zirconium-containing waste salt based on response surface methodology

含锆废盐是粗四氯化锆提纯工艺产生的主要固废,含有大量氧化锆和可溶性氯化物,通过水浸-焙烧处理可回收其中的氧化锆。采用响应曲面法优化水浸工艺,当液固比为8∶1 mL/g,搅拌时间为60 min,浸出次数为3次时,浸出渣中氧化锆含量的预测值为95.2%。同时对浸出渣进行焙烧处理,当焙烧温度为600℃,时间为60 min时,焙烧产物中氧化锆含量为96.23%。采用SEM、XRD、XRF对浸出渣和焙烧产物的微观形貌和成分进行表征分析,研究结果表明,浸出渣和焙烧产物的主要成分为氧化锆,焙烧产物中氧化锆的含量相比浸出渣提高约1%,且晶粒相比浸出渣表现更优。

Zirconium-containing waste salt is the main solid waste in the purification process of crude zirconium tetrachloride,which contains a large amount of zirconia and soluble chloride,and zirconia can be recovered by water leaching and roasting.Response surface methodology is used to optimize the water leaching process.When the liquid-solid ratio is 8:1 mL/g,the stirring time is 60 min,and the leaching times are 3 times,the predicted value of zirconia content in the leaching residue is 95.2%.At the same time,the leaching residue is roasted.When the roasting temperature was 600℃and the time is 60 min,in this connection,the content of zirconia is 96.23%.The micro morphology and composition of leaching residue and roasting product are characterized and analyzed by SEM,XRD and XRF.The results show that the main component of the leaching and roasting products is zirconia,and the content of zirconia in the roasting products is increased by 1%compared with that of the leaching products,and the grain size is better than that of the leaching residue.