Development of Hydrometallurgical Treatment of Steel-making Dust

用硫酸和盐酸浸取炼钢烟尘，并对其动力学进行了研究。将含锌的高品位炼钢粉尘粉碎至-200目，在不同条件下进行金属浸出，考察了锌、铁、铅的浸出率，在弱浸出条件下锌浸出80%左右，铁的浸出率仍低于10%。铁的浸出在很大程度上取决于酸浓度和浸出温度等浸出条件。铅在硫酸中的萃取量很小，而铅在盐酸中优先浸出。这可能是由于铅在这些酸中的溶解度不同所致。浸出率服从对数函数规律，符合体积反应模型。对炼钢烟尘进行了硫化焙烧，并对焙烧烟尘进行了烧碱浸出。在氧气和二氧化硫混合气体中焙烧，研究了烟尘的特性变化，在600℃的氧气和二氧化硫混合气体中焙烧，几乎所有的锌都被烧碱溶液浸出。对于烟尘中锌和铅的选择性浸出，硫酸焙烧和烧碱浸出是有效的。

The leaching of steel-making dust with sulfuric acid and hydrochloric acid has been conducted, and its kinetics has been studied. High grade steel-making dust in zinc were crushed to minus 200 mesh, and treated to extract metals under several conditions, and leaching percentages of zinc, iron and lead were investigated.The extraction degree of iron is less than 10% even when zinc is leached out about 80% by the weak leaching condition. The leaching of iron largely depends on leaching conditions such as acid concentration and leaching temperature. The extraction of lead is very small in the sulfuric acid, while lead is preferentially leached in the hydrochloric acid. This fact may be attributed to the difference of the solubility of lead in these acid. The leaching rate obeys the logarithmic function rule, which is expected to the volume reaction model.Sulfating roasting of steel-making dust has been conducted, and caustic soda leaching of the roasted dust has been done. The dust was roasted in the mixed gas of oxygen and sulfur dioxide, and the characteristic change was investigated.When the dust is roasted at 600℃ in the mixed gas of oxygen and sulfur dioxide, almost all zinc is leached out by caustic soda solution. For selective leaching of zinc and lead from the dust, sulfating roasting and caustic soda leaching is effective.