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高爐粉塵Fe和Zn非熔態分離工藝

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

  • 摘要: 開發一種高爐粉塵再資源化處理工藝,采用"非熔態還原-磁選分離-Zn的回收、富集"方法對典型高爐粉塵進行Fe、Zn非熔態分離研究.結果表明:在910~1 010℃,使用純H2、CO為還原劑進行非熔態還原,同時實現粉塵中Fe2O3(s)→Fe(s)和ZnO(s)→Zn(g)的高度轉變,金屬化率達到90%以上,氣化脫鋅率達到99%以上,且還原過程未發生燒結.還原產物直接經磁選分離、富集得到TFe品位>90%的富Fe物料;含鋅揮發物經回收、富集得到ZnO含量>92%的富Zn物料.成功地將高爐粉塵全部轉化為MFe、ZnO等有價資源,實現了零排放,且分離過程不需高溫熔融,過程能耗低,無環境污染.

     

    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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