含铅冶炼废渣中铅的机械力化学稳定行为  

Mechanochemical Stabilizing Behavior of Lead in the Lead-containing Smelting Slag

作　　者：张纯[1,2] 闵小波[1] 王密[1] 张建强[1] 李辕成[1] 

机构地区：[1]中南大学冶金与环境学院,湖南长沙410083 [2]湖南城市学院市政与测绘工程学院,湖南益阳413000

出　　处：《过程工程学报》2015年第6期1034-1038,共5页The Chinese Journal of Process Engineering

基　　金：湖南省科技重大专项基金资助项目(编号:(2012FJ1010);湖南省高校产学研示范合作基地资助项目(编号:湘教通[2014]239号)

摘　　要：将不同添加剂与含铅冶炼烟气渣混合球磨,采用机械力化学方法研究渣中铅的固定效果,分析了渣的化学成分及浸出毒性,考察了添加剂对铅稳定率的影响,通过模拟酸处理实验研究废渣中铅稳定化机制.结果表明,添加剂对铅机械力化学稳定性的促进顺序为铁粉>铝粉>FeSO_4>Fe_2O_3.以铁粉作稳定剂、不锈钢球为球磨介质,废渣中铅稳定化的最佳参数为:稳定剂用量8%(w)、球料质量比8:1、球磨时间1.5 h、球磨转速400 r/min.该条件下废渣中铅浸出毒性为0.258 mg/L,铅稳定率为99.77%.酸处理过程中球磨样品中铁粉表面腐蚀产生的铁氧化物对铅离子的吸附是铅浸出毒性降低的主要原因.Mechanochemical method was adopted to study the stabilization of Pb in a Pb-containing smelting slag when different stabilizing agents were added. The chemical composition and leaching toxicity of slag were analyzed. The stabilization mechanism of lead in the slag was studied by simulated acid treatment. The effects of four stabilizing additives（iron powder, aluminite powder, hematite and ferrous sulfate） on the leaching toxicity and stabilization rate of lead were examined. The results showed that the promoting effect of four additives on the stabilization of lead followed the order of iron powder aluminite powder ferrous sulfate hematite. The optimum conditions for the stabilization were the amount of stabilizer at 8%（ω）, mass ratio of grinding media to material 8：1, milling time 1.5 h and milling speed 400 r/min. Under the optimum conditions, the leaching toxicity of lead was 0.258 mg/L and the stabilization rate of lead reached 99.77%. The adsorption of lead ion by the iron oxides on the surface of milled iron particles was the main reason for the decrease of Pb leaching toxicity.

关 键 词：冶炼废渣 铅 机械力化学 稳定 浸出毒性 

分 类 号：TF812[冶金工程—有色金属冶金]