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

  • 摘要: 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.

     

    Abstract: 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.

     

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