从高炉瓦斯泥中湿法回收锌的新工艺(Ⅰ):废酸浸出及中和除铁  

A New Process for Recovering of Zinc From Blast Furnace Sludge(Ⅰ): Leaching Using Waste Acid and Removal of Iron by Neutralization

作　　者：刘淑芬[1] 杨声海[1] 陈永明[1] 明磊[1] 

机构地区：[1]中南大学冶金科学与工程学院,湖南长沙410083

出　　处：《湿法冶金》2012年第2期110-114,共5页Hydrometallurgy of China

摘　　要：针对攀钢高炉瓦斯泥含锌高、不能直接返回烧结配料的问题,提出了以该厂自有的钛白废酸作浸出剂,采用低酸浸出—中和除铁—萃取—电积工艺从瓦斯泥中回收金属锌。研究了锌的浸出及浸出液除铁过程。结果表明:在废酸用量855L/t瓦斯泥、常温、液固体积质量比4︰1、反应时间2h条件下,锌平均浸出率为97.94%,铁平均浸出率在6.52%以下。对此浸出液进行中和氧化沉铁,在双氧水用量为理论用量的1.3倍、反应温度为50℃条件下,铁、砷、锑共沉淀而被除去,锌损失率在2.90%左右。Blast furnace sludge of Pangang Group Company contains a lot of zinc and can not be returned directly to sinter as an ingredient. A new process including low-acid leaching with waste acid from titanium dioxide plant,iron precipitation, solvent extraction and electrowinning stages to recover zinc is proposed. This article presented the stages of leaching and iron precipitation. Under the optimum leaching conditions, the waste acid amount of 855 L/t, liquid-solid ratio of 4 ： 1, room temperature,reaction time of 2 h, the average leaching percentage of zinc is 97. 94M and the iron leaching percentage is 6.52%. The optimal process conditions of iron precipitation are the mass ratio of 1. 3 for hydrogen peroxide to Fe2＋, reaction temperature of 50 ℃. Under the optimal process conditions of iron precipitation,the loss percentage of zinc is about 2.90%.

关 键 词：高炉瓦斯泥 钛白废酸 锌 浸出 沉铁 

分 类 号：X756[环境科学与工程—环境工程] TF813[冶金工程—有色金属冶金]