Development of Hydrometallurgical Treatment of Steel-making Dust

炼钢粉尘湿法处理的研究进展

• 批准号: 10650735
• 负责人: KAWAHARA Masayasu
• 金额: $ 1.79万
• 依托单位: Kumamoto University
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Scientific Research (C)
• 财政年份: 1998
• 资助国家: 日本
• 起止时间: 1998 至 1999
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-10650735/
• 关键词: Steel-making Dust; Sulfuric Acid Leaching; Hydrochloric Acid Leaching; Leaching Rate; Sulfating Roasting; Caustic Soda Leaching; 湿式処理; ジンクフェライト; アンモニア浸出

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.

采用硫酸和盐酸对炼钢粉尘进行浸出，并研究了其动力学。将锌中的高品位炼钢烟尘粉碎至-200目，在多种条件下提取金属，并考察锌、铁、铅的浸出率。弱浸出条件下，即使锌浸出80%左右，铁的浸出率也不足10%。铁的浸出很大程度上取决于浸出条件，例如酸浓度和浸出温度。硫酸中铅的萃取量很小，而盐酸中铅优先浸出。这一事实可能归因于铅在这些酸中的溶解度的差异。浸出率服从对数函数规律，符合体积反应模型。对炼钢烟尘进行硫酸化焙烧，并对焙烧烟尘进行烧碱浸出。将粉尘在氧气和二氧化硫混合气体中焙烧，研究其特性变化。当粉尘在氧气和二氧化硫混合气体中进行600℃焙烧时，锌几乎全部被烧碱溶液浸出。对于从粉尘中选择性浸出锌和铅，硫酸化焙烧和烧碱浸出是有效的。