Leaching behavior of metals from high-arsenic dust by NaOH-Na2S alkaline leaching

被引:80
作者
Guo, Xue-yi [1 ,2 ]
Yi, Yu [1 ,2 ]
Shi, Jing [1 ]
Tian, Qing-hua [1 ,2 ]
机构
[1] Cent S Univ, Sch Met & Environm, Changsha 410083, Peoples R China
[2] Cent S Univ, Cleaner Met Engn Res Ctr, Nonferrous Met Ind China, Changsha 410083, Peoples R China
关键词
high arsenic dust; alkaline leaching; leaching behavior; arsenic; EXTRACTION; REMOVAL; ZINC; RECOVERY; COPPER; WATER;
D O I
10.1016/S1003-6326(16)64118-3
中图分类号
TF [冶金工业];
学科分类号
0806 ;
摘要
Arsenic is selectively extracted from high-arsenic dust by NaOH-Na2S alkaline leaching process. In the leaching arsenic process, the effects of alkali-to-dust ratio, sodium sulfide addition, leaching temperature, leaching time and liquid-to-solid ratio on metals leaching efficiencies were investigated. The results show that the arsenic can be effectively separated from other metals under the optimum conditions of alkali/dust mass ratio of 0.5, sodium sulfide addition of 0.25 g/g, leaching temperature of 90 degrees C, leaching time of 2 h, and liquid-to-solid ratio of 5: 1 (mL/g). Under these conditions, the average leaching efficiencies of arsenic, antimony, lead, tin and zinc are 92.75%, 11.68%, 0.31%, 29.75% and 36.85%, respectively. The NaOH-Na2S alkaline leaching process provides a simple and highly efficient way to remove arsenic from high-arsenic dust, leaving residue as a suitable lead resource.
引用
收藏
页码:575 / 580
页数:6
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