低品位多金属矿石焙砂浸出铜锌工艺研究
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摘要
研究了采用一次浸出—焙烧—二次浸出工艺从低品位多金属矿石焙砂中浸出铜和锌。结果表明:一次浸出的最佳条件为浸出温度60℃、初始硫酸质量浓度60g/L、浸出时间2.0h、液固体积质量比2.5∶1,最佳条件下,铜浸出率为92.65%,锌浸出率为88.74%,铁浸出率为20.83%,浸出渣率为42.73%,渣中铜和锌主要以硫化铜和硫化锌形式存在;一次浸出渣在900℃下焙烧60min,然后再进行二次浸出,铜、锌浸出率提高到98%左右,而铁浸出率保持在22%~23%。
The leaching of Cu and Zn from a low-grade polymetallic ore calcine was researched by the process of leaching-roasting-leaching.The results indicate that the leaching rates of Cu,Zn and Fe are92.65%,88.74% and 20.83%,respectively,under the following optimum conditions of leaching temperature of 60 ℃,initial sulfuric acid concentration of 60g/L,leaching time of 2hand the ratio of liquid-to-solid of 2.5.The main compositions of Cu and Zn in the first leaching residue are CuS and ZnS.The leaching residue is roasted at a temperature of 900 ℃for 60 min then is second leached,the leaching rates of Cu and Zn can increase to about 98%,and the leaching rate of Fe keeps at the range of 22%-23%.
The leaching of Cu and Zn from a low-grade polymetallic ore calcine was researched by the process of leaching-roasting-leaching.The results indicate that the leaching rates of Cu,Zn and Fe are92.65%,88.74% and 20.83%,respectively,under the following optimum conditions of leaching temperature of 60 ℃,initial sulfuric acid concentration of 60g/L,leaching time of 2hand the ratio of liquid-to-solid of 2.5.The main compositions of Cu and Zn in the first leaching residue are CuS and ZnS.The leaching residue is roasted at a temperature of 900 ℃for 60 min then is second leached,the leaching rates of Cu and Zn can increase to about 98%,and the leaching rate of Fe keeps at the range of 22%-23%.
引文
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[3]喻连香.低品位铅锌矿选矿工艺的研究[J].广东有色金属学报,2003,13(1):13-17.
[4]班丽瑛,黄海静,黄海露.某难选银铅锌多金属矿石选矿试验研究[J].湿法冶金,2014,33(2):97-100.
[5]Mousavi S M,Jafari A,Yaghmaei S,et al.Bioleaching of Low-grade Saphalerite Using A Column Reactor[J].Hydrometallurgy,2006,82(1/2):75-82.
[6]梁杰,黄岩,范丽君,等.低品位氧化锌矿石铁还原度对硫酸浸出锌的影响[J].湿法冶金,2012,31(4):234-236.
[7]张向阳,王吉坤,巨佳,等.一种高铁低品位硫化铅锌混合精矿综合利用工艺探讨[J].矿冶,2010,19(3):78-80.
[8]曹耀华,高照国,刘红召,等.从某低品位金钼粗精矿中浸出金、钼试验研究[J].湿法冶金,2014,33(5):339-342.
[9]Qin Wenqing,Li Weizhong,Lan Zhuoyue,et al.Simulated Small-scale Pilot Plant Heap Leaching of Low-grade Oxide Zinc Ore With Integrated Selective Extraction of Zinc[J].Minerals Engineering,2007,20(7):694-700.
[10]铅锌冶金学编委会.铅锌冶金学[M].北京:科学出版社,2003.
[11]朱祖泽,贺家齐.现代铜冶金学[M].北京:科学出版社,2003.