哥伦比亚某金矿提高锌粉置换率试验研究

Experimental Research on Improving the Replacement Rate of Zinc Powder in a a Colombian Gold Min

哥伦比亚某金矿从全泥氰化技改为先进行硫浮选,然后硫浮选精矿进行浸出的工艺流程后,贵液锌粉置换率低,金属流失,回收金效果差,贵液品位约1.5~1.8g/t,相比技改前期上升27%左右。通过开展氰化钠浓度、锌粉用量、醋酸铅用量、PH值单因素试验,优化药剂制度,提高氰化钠与醋酸铅用量,金作业置换率稳定在99.0%以上,贫液金品位降低至0.015 ppm以内,尾矿带走水分中金含量下降,彻底解决了因置换率低造成金属流失的问题,保证了锌粉置换作业技术指标。

In a Colombian gold mine,after the technical transformation from all-sliming cyanidation to sulfur flotation followed by leaching of sulfur flotation concentrate,the replacement rate of zinc powder in pregnant solution was low,resulting in metal loss and poor gold recovery.The grade of pregnant solution was about 1.5~1.8g/t,which increased by about 27%compared with that in the early stage of technical transformation.By carrying out single-factor tests of sodium cyanide concentration,zinc powder dosage,lead acetate dosage and PH value,optimizing reagent system and increasing the dosage of sodium cyanide and lead acetate,the replacement rate of gold operation is stabilized at more than 99.0%,the gold grade of barren solution is reduced to less than 0.015 ppm,and the gold content in water taken away by tailings is reduced,which completely solves the problem of metal loss caused by low replacement rate.And that technical index of the zinc power replacement operation is ensured.