烘烤
尾矿
氰化物
化学
浸出(土壤学)
湿法冶金
金氰化
磁选
冶金
氧化铁
无机化学
环境科学
硫酸
材料科学
物理化学
土壤科学
土壤水分
有机化学
作者
Lei Zhang,Tao Jiang,Xueyi Guo,Qinghua Tian,Shuiping Zhong,Li Dong,Hong Qin,Zuowei Liu,Brian Makuza
出处
期刊:Hydrometallurgy
[Elsevier]
日期:2023-03-01
卷期号:217: 106028-106028
被引量:16
标识
DOI:10.1016/j.hydromet.2023.106028
摘要
Cyanide Tailings (CTs) are known as hazardous resources that accumulate hundreds of millions of tons, threatening the ecological environment. This work proposes an eco-friendly and efficient way to recover gold, iron, and silicon from CTs. By controlling the reduction atmosphere and temperature in the reduction roasting process, >99% of cyanide could be selectively removed, and 65.3% of the encapsulated gold in iron oxide and sulfide could also be released. The reduction of particle size by mechanical activation liberated 92.3% of gold encapsulated in silicate and iron oxide minerals which increased the extraction efficiency of gold in non-cyanide leaching process to 94.5%. The grade and recovery of iron concentrate obtained from the magnetic separation reached 60.9% and 74.6%, respectively, by regulating the magnetic field intensity of 70 kA/m. While the iron concentrate could be directly traded, the tailings of Si grade 28.4% (w/w) could be used in building materials. The proposed technology can realize the harmless resource utilization of the hazardous CTs with the potential for promising industrial applications.
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