黑铜泥氢氧化钠氧压碱浸脱砷研究
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摘要
在氢氧化钠溶液中釆用通氧加压强化浸出工艺对黑铜泥进行脱砷,实验结果表明:在Na OH浓度为50 g/L、浸出温度140℃、氧分压0.6 MPa、液固比8 m L/g、浸出时间1.5 h、搅拌速度600 r/min的较优工艺条件下,黑铜泥中砷浸出率为96.74%,铜、锑、铋浸出率分别仅为1.19%、2.23%、1.08%,实现了砷的选择性脱除。碱浸液采用冷却结晶回收砷酸钠,结晶母液补加适量氢氧化钠返回浸出。渣中锑、铋、银等有价金属得到高度富集。
Removing arsenic from black copper slime with sodium hydroxide medium by oxygen pressure alkaline leaching process was studied systematically. It is found an experiment with the optimum conditions including: a Na OH concentration at 50 g/L,leaching temperature at 140 ℃,an oxygen partial pressure of 0.6 MPa,liquid-to-solid ratio at8 m L/g,leaching time of 1.5 h and stirring speed at 600 r/min,resulted in the leaching rate of As from the black copper slime up to 96.74%,while the extent of dissolution of Cu,Sb and Bi as low as 1.19%,2.23% and 1.08%,respectively,thus making it possible to selectively removing arsenic. The alkali leaching liquid was then processed by cooling and crystallization to recover sodium arsenate,with mother liquor after crystallization back to leaching process together with an appropriate amount of Na OH. The antimony,bismuth and silver were all highly concentrated in the slag.
Removing arsenic from black copper slime with sodium hydroxide medium by oxygen pressure alkaline leaching process was studied systematically. It is found an experiment with the optimum conditions including: a Na OH concentration at 50 g/L,leaching temperature at 140 ℃,an oxygen partial pressure of 0.6 MPa,liquid-to-solid ratio at8 m L/g,leaching time of 1.5 h and stirring speed at 600 r/min,resulted in the leaching rate of As from the black copper slime up to 96.74%,while the extent of dissolution of Cu,Sb and Bi as low as 1.19%,2.23% and 1.08%,respectively,thus making it possible to selectively removing arsenic. The alkali leaching liquid was then processed by cooling and crystallization to recover sodium arsenate,with mother liquor after crystallization back to leaching process together with an appropriate amount of Na OH. The antimony,bismuth and silver were all highly concentrated in the slag.
引文
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[3]胡滔,魏海彬.砷滤饼加压浸出生产实践[J].铜业工程,2014(6):36-38.
[4]蒋开喜,王海北,王玉芳,等.铜冶炼过程中硫化砷渣综合利用技术[J].有色金属科学与工程,2014,5(5):13-17.
[5]石靖,易宇,郭学益.湿法冶金处理含砷固废的研究进展[J].有色金属科学与工程,2015,6(2):14-20.
[6]易宇,石靖,田庆华,等.高砷烟尘氢氧化钠-硫化钠碱性浸出脱砷[J].中国有色金属学报,2015,25(3):806-814.
[7]余国林,张盈,郑诗礼,等.含砷钴镍渣中砷碱介质氧化浸出机理[J].过程工程学报,2013,13(6):939-945.
[8]郭学益,石靖,易宇.高砷烟尘碱性浸出液氧化结晶制备砷酸钠[J].矿冶工程,2015,35(3):83-86.