砷碱渣中砷锑分离中试研究
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摘要
在小型试验研究的基础上进行了砷碱渣砷锑分离中试研究,验证水热浸出-价态调控氧化脱锑工艺的可行性,并得到最佳工业生产操作参数:砷碱渣的破碎粒度5 mm,浸出温度95℃,一次浸出时间60 min,二次浸出时间180 min,一次浸出渣的球磨粒度50目,液固比3:1,双氧水的加入量14‰,总氧化时间60 min,双氧水的投加时间20 min,氧化温度80℃。在该条件下,砷的浸出率为97.72%,锑的回收率为96.74%。
The pilot-scale test of antimony and arsenic separation from arsenic-alkali residue was carried out based on the small-scale test.The feasibility of antimony removal by hydrothermal leaching-valence adjustment oxidation process was identified,and the industrial production operation parameters were obtained:the crush particle size of arsenic-alkali residue is 5 mm,the extraction temperature is 95 ℃,the first leaching time is 60 min,the second leaching time is 180 min,the first leaching slag grinding particle size is 50 mesh,the solid-liquid ratio is 1:3,the adding amount of hydrogen peroxide is 14 ‰,the total time for oxidation is 60 min,the hydrogen peroxide feeding time is 20 min and the oxidation temperature is 80 ℃.The leaching rate of arsenic was 97.72%and the recovery rate of antimony was 96.74%under above conditions.
The pilot-scale test of antimony and arsenic separation from arsenic-alkali residue was carried out based on the small-scale test.The feasibility of antimony removal by hydrothermal leaching-valence adjustment oxidation process was identified,and the industrial production operation parameters were obtained:the crush particle size of arsenic-alkali residue is 5 mm,the extraction temperature is 95 ℃,the first leaching time is 60 min,the second leaching time is 180 min,the first leaching slag grinding particle size is 50 mesh,the solid-liquid ratio is 1:3,the adding amount of hydrogen peroxide is 14 ‰,the total time for oxidation is 60 min,the hydrogen peroxide feeding time is 20 min and the oxidation temperature is 80 ℃.The leaching rate of arsenic was 97.72%and the recovery rate of antimony was 96.74%under above conditions.
引文
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[2]王建强,王云燕,王欣,等.湿法回收砷碱渣中锑的研究[J].环境污染治理技术与设备,2006,(7):64-67.
[3]仇勇海,卢炳强,陈自珍,等.无污染砷碱渣处理技术工业试验[J].中南大学学报,2005,(36):234-237.
[4]唐建军,杨天足,宾万达,等.空气氧化硫代亚锑酸钠溶液沉锑研究[J].矿产综合利用,2001,(2):11-14.