老挝某含砷金矿非氰浸出试验研究

Experimental Study on Cyanide-Free Leaching of Arsenic-Bearing Gold Ore from Laos

对老挝某含砷含碳金矿进行了非氰浸出试验研究,考察了磨矿细度、矿浆pH值、矿浆浓度(质量分数)、金蝉环保型黄金选矿剂用量对金浸出效果的影响。结果表明:采用过氧化氢预处理可以提升金浸出率;在磨矿细度-0.074 mm粒级占95%、搅拌速度2000 r/min条件下,采用过氧化氢500 g/t对矿浆预氧化处理3 h,然后再添加石灰3000 g/t、金蝉环保型黄金选矿剂5000 g/t,搅拌浸出30 h,尾渣金品位0.25 g/t,金浸出率92.27%,过氧化氢预氧化能使金浸出率提高1.96个百分点。

A cyanide-free leaching test was performed for the arsenic-carbon bearing gold ore from Laos,and effects of grinding fineness,pH value of pulp,concentration of slurry,and the dosage of golden cicadas environment-friendly leaching agent for gold on gold leaching effect were investigated.The results show that pre-treatment with hydrogen peroxide can improve the leaching rate of gold.With a grinding fineness of-0.074 mm 95%and an agitating speed of 2000 r/min,the pulp is pre-oxidized with 500 g/t of hydrogen peroxide for 3 h,and then treated by 30 h agitation leaching with addition of lime at an amount of 3000 g/t and golden cicadas environment-friendly leaching agent for gold at 5000 g/t,leading to the residue grading 0.25 g/t Au and gold leaching rate of 92.27%.It is shown that this pretreatment with hydrogen peroxide can make gold leaching rate up by 1.96 percentage points.