石硫合剂法浸取废弃线路板中金的试验研究

试验研究了采用石硫合剂法浸取废弃线路板中的金。取废弃线路板粉末5 g,在固液比为1∶3、亚硫酸钠浓度为0.1 mol/L、硫酸铜浓度为0.03 mol/L、氨水浓度为0.5 mol/L、反应时间为2.5 h、反应温度为40℃、pH=10条件下,金的浸出率可达到85%以上。与硫脲、氰化等浸金方法比较,石硫合剂法具有无毒、廉价易得、工艺简单、操作方便等优点,是一种具有开发潜力的浸金技术。

Experimental research on leaching gold from waste printed circuit board by LSSS method

The Lime Sulfur Synthetic Solution method has been used to leach gold from waste printed circuit board. For 5 g printed circuit board power, under solid to liquid ratio of 1：3 ,c（Na2SO3） = 0.1 moL/L,c（Cu^2＋ ） = 0.03 mol/L,c（ NH4^＋ ） = 0.5 mol/L, reaction time =2.5 h,t =40 ℃ ,pH =10,the leaching rate of gold is more than 85 %. The highest leaching rate reaches 92 %. Compared with the methods of thiourea and cyanidation, Lime Sulfur Synthetic Solution method has the advantages of non-toxic, low-cost, simple process and easy to operate. Thus, it would be a potential technology for leaching gold.