高炉粉尘Fe和Zn非熔态分离工艺

Separation technology of Fe and Zn from blast furnace dust at non-molten state

开发一种高炉粉尘再资源化处理工艺,采用"非熔态还原--磁选分离--Zn的回收、富集"方法对典型高炉粉尘进行Fe、Zn非熔态分离研究.结果表明:在910～1 010℃,使用纯H2、CO为还原剂进行非熔态还原,同时实现粉尘中Fe2O3(s)→Fe(s)和ZnO(s)→Zn(g)的高度转变,金属化率达到90%以上,气化脱锌率达到99%以上,且还原过程未发生烧结.还原产物直接经磁选分离、富集得到TFe品位>90%的富Fe物料;含锌挥发物经回收、富集得到ZnO含量>92%的富Zn物料.成功地将高炉粉尘全部转化为MFe、ZnO等有价资源,实现了零排放,且分离过程不需高温熔融,过程能耗低,无环境污染.

A process was developed to dispose blast furnace（BF） dust.The separation of Fe and Zn from BF dust at non-molten state was studied by this process including non-molten reduction,magnetic separation and the recovery and enrichment of zinc.It is found that at temperatures between 910 and 1 010 ℃ the reduction reactions from Fe2O3（s） to Fe（s） and ZnO（s） to Zn（g） are achieved by using pure H2 or CO as a reductant.The average metallization rate and the de-zinc rate are 90% and 99% respectively,and there is no sintering during the reduction process.The iron-rich material with 90% TFe is obtained directly by magnetic separation.After the recovery and enrichment of zinc-bearing volatile,the content of ZnO in the zinc-rich material is over 92%.It is concluded that BF dust can be transformed to valuable resources such as MFe and ZnO.This process has low reduction temperature,low energy consumption and no pollution.