热酸浸出-仲针铁矿工艺回收中浸渣中铜的试验研究  

Experimental research on the recovery of copper from the zinc leaching residue by the hot acid leaching-class goethite process

作　　者：吴钧 曾鹏 张少博 杨全胜 邱伟佳 姜艳 WU Jun;ZENG Peng;ZHANG Shao-bo;YANG Quan-sheng;QIU Wei-jia;JIANG Yan

机构地区：[1]云南云铜锌业股份有限公司,云南昆明650000

出　　处：《中国有色冶金》2021年第2期35-39,48,共6页China Nonferrous Metallurgy

基　　金：云南省科技创新人才计划(2019HC025)。

摘　　要：锌精矿中普遍含有0.5%~1.0%的铜,常规湿法浸出过程中残留在浸出渣中50%~70%的铜在火法挥发工序无法回收,只能残留在窑渣或炉渣中被贱卖。云南某湿法炼锌厂采用常规湿法浸出+回转窑挥发工艺处理浸出渣,产生的回转窑渣在铜价高时采用鼓风炉工艺处理,铜价低时外卖,利润较低。为回收浸出渣中的铜,该厂在大量试验研究的基础上,论证了热酸浸出-仲针铁矿工艺取代常规湿法浸出工艺的可行性,得出以下结论:热酸浸出-仲针铁矿工艺处理锌焙烧矿中浸渣,采用锌焙烧矿作为中和剂,试验结果为渣率32.51%、锌浸出率92.29%、铜浸出率74.33%,而常规湿法浸出工艺渣率46%、锌浸出率85%、铜浸出率40%;采用次氧化锌粉替代锌焙烧矿作为中和剂不经济;高酸浸出后增加一道超高酸浸出工序,铜回收率可提高5.72%,但投资回报率偏低。Zinc concentrate generally contains 0.5%-1.0%copper,and 50%-70%of the copper remaining in the leaching residue during the conventional leaching process cannot be recovered in the fire volatilization process,and can only be left in the kiln slag or other slag.A zinc hydrometallurgy plant in Yunnan adopts the conventional leaching and rotary kiln volatilization process to treat the zinc leaching residue.The rotary kiln slag produced is processed by the blast furnace process when the copper price is high,and the slag was sold out directly when the copper price is low,and the profit is lower.In order to recover the copper in the leaching residue,the plant demonstrated the feasibility of the hot acid leaching-class goethite process to replace the conventional leaching process on the basis of a large number of experimental studies,and the following conclusions were drawn.The zinc leaching residue is treated by the hot acid leaching-class goethite process,and zinc roasted ore is used as the neutralizer,the slag rate is 32.51%,the zinc leaching rate is 92.29%,and the copper leaching rate is 74.33%.The zinc leaching slag is treated by conventional leaching process,the slag rate is 46%,the zinc leaching rate is 85%,and the copper leaching rate is 40%.It is not economical to use secondary zinc oxide powder to replace zinc roasted ore as a neutralizer.Adding an ultra-high acid leaching process after high acid leaching can increase the copper recovery rate by 5.72%,but the return on investment is low.

关 键 词：湿法炼锌 锌浸出渣 回转窑渣 常规湿法浸出 热酸浸出-仲针铁矿工艺 铜回收 锌焙烧矿 次氧化锌粉 

分 类 号：TF813[冶金工程—有色金属冶金] TF811