熔铸收尘氧化锌湿法脱氯及综合回收试验

Experiment on wet dechlorination and comprehensive recovery of zinc oxide for melting and casting dust collection

目前国内收尘氧化锌脱氯主要采用火法脱氯,存在诸多缺点,如设备投资大、清理工作量大、造成环境污染等。湿法炼锌熔铸收尘氧化锌含氯高,无法直接回用于湿法系统。基于此,采用收尘氧化锌水洗—水洗液沉锌与收尘氧化锌酸性浸出-酸浸液铜渣除氯2种湿法回收方案进行试验研究,对比分析2种方案的试验结果,并优化湿法回收工艺参数。结果表明:收尘氧化锌水洗-水洗液沉锌方案存在除氯效率低、沉锌效果差等问题;酸性浸出-酸浸液铜渣除氯方案具有除氯效果好、锌回收率高、成本低的优势,经验证该工艺是可行的。

At present,dechlorination of zinc oxide for dust collection mainly adopts fire method dechlorination in China,which has many disadvantages,such as large equipment investment,large cleaning workload,environmental pollution.Zinc oxide for dust collection in zinc hydrometallurgy has high chlorine content and cannot be directly reused in the wet system.Based on the above,the two wet recovery schemes of zinc oxide water washing-water washing solution zinc precipitation and zinc oxide acidic leaching-acid leaching solution copper residue dechlorination were studied,and the test results of the two schemes were compared and analyzed,and the wet recovery process parameters were optimized.The results show the zinc oxide water washing-water washing solution zinc precipitation scheme has the problems of low decolorination efficiency,bad zinc precipitation effect,etc.;and zinc oxide acidic leaching-acid leaching solution copper residue dechlorination scheme has the advantages of good decolorination,high zinc recovery rate and low cost,and it is proved that the process is feasible.