黄金科学技术 ›› 2019, Vol. 27 ›› Issue (1): 129-136.doi: 10.11872/j.issn.1005-2518.2019.01.129
赵文强1,姜传进1,石宝宝2
Wenqiang ZHAO1,Chuanjin JIANG1,Baobao SHI2
摘要:
由于氰化物对硫铁矿有一定的抑制作用,直接采用浮选法回收氰化尾渣中硫铁矿的效果不理想。因此,必须先对氰化尾渣进行预处理,使被抑制矿物恢复浮选活性。采用添加还原剂和浓硫酸协同预处理方法使被抑制矿物恢复活性,并分别考察加药顺序、焦亚硫酸钠用量和pH值等因素对硫精矿回收率和尾矿品位的影响。浮选试验采用一粗、一精、二扫流程,考察了pH值调节剂、铵盐和复合抑制剂等对硫精矿回收率和尾矿品位的影响。最终确定预处理最佳工艺条件:先添加2 kg/t的Na2S2O5药剂预处理1 h,然后加入浓硫酸将矿浆pH值调至2~3并维持2 h,再用NaOH将pH值调至6~7。浮选最佳条件:丁胺黑药用量为500 g/t,复合抑制剂用量为300~500 g/t,通过试验取得硫精矿品位为40%~42%,尾矿中S元素品位为6%~8%的良好结果。
中图分类号:
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