铜萃余液综合回收铜、锌试验研究

摘要

采用硫化沉淀工艺对铜萃余液中的铜、锌等有价金属进行了回收试验研究,考察了硫化沉淀pH值、硫化钠加入量和硫化反应时间等因素以及铜、锌共沉淀和分步沉淀对铜、锌回收率和精矿品位的影响.试验结果表明,铜、锌分步沉淀时,萃余液pH =2.5,加入1.2倍硫化钠用量,反应20 min,沉铜效果最好,铜回收率98.33％,精矿铜品位38.88％;pH =3.5,加入1.4倍硫化钠用量,反应20 min,沉锌效果最好,锌回收率为98.36％,精矿锌品位33.17％.该工艺可有效回收萃余液中的铜、锌等有价金属.%The experimental study on using sulfide precipitation process to recover copper, zinc and other valuable metals from copper extraction raffinate was carried out.The study investigated the influence on copper and zinc recovery rate and concentrate grade played by pH of sulfide precipitation,sodium sulfide dosage and curing reaction time,as well as one step precipitation and multiple-step precipitation.The results show that it achieves the best results that the copper recovery rate is 98.33 % and the concentrate grade is 38.88 % on the condition of multiple sulfide precipitation ,and that the raffinate pH is 2.5 ,1.2 times amount of sodium sulfide is added and the reaction time is 20 minutes.The best effect for zinc immersion is achieved on the condition that PH is 3.5,1.4 times amount of sodium sulfide is added and the reaction time is 20 minutes.With that, zinc recovery rate is 98.36 % and concentrate grade is 33.17 %.The process can effectively recover copper,zinc and other valuable metals from copper raffinate.