热浸镀锌中铁-铝-锌渣回收工艺研究

摘要

针对铁铝锌渣的回收过程,研究了熔炼温度、静置时间以及添加剂对粗锌回收率和主要成分的分布规律的影响.研究表明,采用(质量分数)50%NaCl+25%KCl+25%CaF2覆盖剂对熔池进行保护,并用渣重0.3%~0.5%的ZnCl2除渣工艺可使粗锌直收率达到73%.450℃二次除渣静置工艺可以有效提高粗锌品质,粗锌中的铁、铝(质量分数)分别从一次除渣工艺的0.089%和0.485%降至0.022%和0.228%.%Aiming at the recycling process of the Fe-Al-Zn slag,the influence of the melting temperature, standing time and additives on recovery of zinc and the distribution of the main elements have been investi-gated.The results show that the recovery of zinc can achieve 73% by protecting the covering agent and adding ZnCl2 which weighted 0.3~0.5 percent of slag in the bath.It can significantly improve the quality of zinc,the mass fraction of iron and aluminum in the zinc ingot from 0.089%and 0.485% to 0.022% and 0.228% by removing and holding for the second time at 450℃.