河南某金矿尼尔森重砂催化盐酸除杂试验

Experiment on Catalytic Removal of Impurities by Hydrochloric Acid from Nilsen Heavy Sand in a Gold Mine in Henan Province

为了提高河南某金矿选矿厂尼尔森重砂的金销售计价系数,在对尼尔森重砂性质研究的基础上,对多种有机酸除杂原理对比分析,确定了盐酸除杂试验路线,并通过单因素条件试验,确定了氯化钠催化盐酸除杂的最佳试验条件。结果表明:当盐酸浓度为3 mol/L,氯化钠浓度为4 mol/L,反应温度为90℃,液固比为10∶1,反应时间为1.5 h时,除杂率最优。并在此基础上进行了最佳条件综合试验,尼尔森重砂金的含量从18.88%提高至55.5%,除杂率达65.98%,销售时金的计价系数可由94%提高至96%,每年预计增加经济效益400余万元。

In order to improve the gold sales valuation coefficient of Nielsen heavy sand in a gold con⁃centrator in Henan Province,based on the study of the properties of Nielsen heavy sand,the principle of im⁃purity removal by various organic acids is compared and analyzed,and the test route of hydrochloric acid im⁃purity removal is determined.Through the single factor condition test,the optimum test conditions of hydro⁃chloric acid impurity removal catalyzed by sodium chloride are determined.The results show that when the concentration of hydrochloric acid is 3 mol/L,the concentration of sodium chloride is 4 mol/L,the reaction temperature is 90℃,the liquid-solid ratio is 10∶1,and the reaction time is 1.5 h,the impurity removal rate is optimal.On this basis,the comprehensive test of the best conditions is carried out.The content of Nielsen heavy placer gold increases from 18.88%to 55.5%,the impurity removal rate reaches 65.98%,and the valuation coefficient of gold in sales time could be increased from 94%to 96%.It is expected to increase economic benefits by more than 4 million yuan per year.