某低品位金矿综合回收试验研究

以某低品位金矿作为研究对象,根据原矿MLA工艺矿物学分析,初步确定实验采用原矿混合浮选-精矿氰化浸金-浸渣浮铅的联合工艺流程。原矿经一粗两扫两精的混合浮选流程,得到Au品位16.36 g/t、回收率78.44%；Pb品位7.21%、回收率84.12%的混合精矿；再对混合精矿进行氰化浸金,为考察NaCN用量、CaO用量、浸出时间对金浸出率的影响,进行单因素试验,并利用响应曲面法优化浸出条件。结果表明,响应曲面法优化金浸出率模型p值小于0.05,响应曲面法优化得到的最佳浸出条件为：CaO用量为3093.03 g/t；NaCN用量为2317.91 g/t；浸出时间为33.49 h,在此条件下模型预测金浸出率为90.49%。经过实验验证,得到金浸出率为89.91%,实验结果与响应曲面法优化结果基本一致；浸渣经过一粗一扫两精的浮选实验,最终得到Pb品位50.41%、作业回收率51.11%；Au品位8.56 g/t、作业回收率38.87%的铅精矿。此联合工艺流程得到了不错的选矿指标,实现了资源的综合利用。

Experimental study on comprehensive recovery of a low grade gold ore

According to the MLA analysis of a low grade gold mineral, the raw ore was treated by means of the combined technology, ie. Bulk flotation of raw ore, cyanide leaching of gold of concentrate and leaching residue to float lead. Through a mixed flotation, the bulk concentrate with 16.36g/t of gold and 7.21% of lead can be obtained by a recovery of 78.44% Au and 84.12%. For the cyanide leaching of gold, single factor experiments were taken to test the effects of leaching time, dosage of NaCN and CaO. After that, the leaching conditions were optimized by response surface method. The results show that the optimized gold leaching rate model p value is less than 0.05. The optimum leaching conditions are as follows: the leaching time of 33.49h, the medicament dosage of Cao 3093.03g/t and NaCN 2317.91g/t. Under these conditions, the gold leaching rate is predicted to be 90.49%. The experimental result are consistent with optimization result by the value of 89.91%. The lead concentrate with Pb grade of 50.41% and operation recovery of 51.11%, while the Au of 8.56g/t grade and operation recovery of 38.87%. A great mineral processing indexes can be acquired by this combined technology and the multipurpose utilization of resources has been achieved.