综合回收包钢高炉布袋灰中有价元素试验研究

Experimental Study on Comprehensive Recovery of Valuable Elements in Blast Furnace Bag Dust of Baotou Steel

从炼铁过程烟气回收得到的高炉布袋灰中,除包含固体炉料的铁、碳、氧外,还有以氧化物形式存在的锌、铅和以氯化物形式存在的钾、钠等有价元素。针对这些元素对炼铁生产的影响及经济价值,设计并进行了高炉布袋灰“NH_(4)Cl浸出→置换除杂→电解”试验,得到了氯化铵钾、锌等符合国家标准的产品,同时得出了包钢高炉布袋灰中锌、铅浸出、浸出液沉淀锌和置换及电解等工艺的最佳条件。

In the blast furnace bag dust recovered from flue gas in ironmaking process,there are not only the iron,carbon and oxygen contained in solid charge,but also such valuable elements as zinc and lead in the form of oxide as well as potassium and sodium in the form of chloride.In view of the influences and economic value of these elements on ironmaking production,the experiment of“leaching of NH_(4)Cl→replacement and impurity removal→electrolysis”for blast furnace bag dust is designed and carried out.As a result,the products of potassium ammonium chloride and zinc in line with national standard as well as the optimum conditions of leaching zinc and lead from blast furnace bag dust,precipitation of zinc in leachate,replacement and electrolysis are obtained.