氯氧化锆生产排放废硅渣中锆资源的回收

Recovery of zirconium resources from silica residue discharged in production of ZrOCl2·8H2O

开展了氯氧化锆生产排放废硅渣中锆资源的回收工艺研究,结果表明,当废硅渣在50℃条件下溶解废碱液时,硅渣中夹带的未熔锆英砂可以沉积,回收率可达到98.5%以上。继续加热溶硅碱液,可溶锆可与硅产生凝聚,形成锆富集物沉淀,锆富集物中湿基的ZrO2含量最高可达6.5%,可溶锆的回收率在97%以上。回收得到的未熔砂和锆富集物可直接返回氯氧化锆主流程中再利用,从而实现硅渣中锆的资源化利用。

The recovery process of zirconium resource from the waste silica slag discharged from the production of zirconium oxychloride was studied.The results showed that the un-reacted zircon sand can be deposited when the waste silica slag dissolved the waste alkali solution at temperature of 50℃,the recovery rate can reach over 98.5%.When the solution was heated at high temperature,the soluble zirconium can agglomerate and form precipitate,in which the content of ZrO2 is up to 6.5%,the recovery ratio is over 97%.The recovered zircon sand and zirconium precipitation can be directly returned to the process of zirconium oxychloride,which can realize the resource utilization of zirconium of silica slag.