响应曲面法优化金浸出条件试验研究

内蒙古某金矿采用全泥氰化工艺,因原矿性质发生变化,需进行浸出条件优化试验研究。在工艺矿物学研究的基础上,采用响应曲面法考察了氧化钙用量、氰化钠用量、充气量3种因素对金浸出率的影响,建立了拟合方程与响应曲面。结果表明:氧化钙用量、氰化钠用量、充气量对金浸出率影响较大,且三者间有明显的交互作用;在磨矿细度-74μm占90%的条件下,最优浸出条件为氧化钙用量3.330 kg/t、氰化钠用量1.040 kg/t、充气量0.076 m^3/h,此时金浸出率预计可达94.75%。该研究为现场工艺优化提供了技术依据。

Experimental research on the optimization of gold ore leaching conditions by Response Surface Methodology

The experimental research on the optimization of leaching conditions is necessary for the all-sliming cyanide leaching operation in a gold mine in Inner Mongolia due to the change of raw ore properties. Based on the results of process mineralogy,the effects of CaO dosage,NaCN dosage and aeration rate on gold leaching rate were investigated by Response Surface Methodology and fitting formula and response surface are established. The results show that CaO dosage,NaCN dosage and aeration rate could affect gold leaching rate significantly and these three factors had serious interaction effect. The leaching rate is estimated to reach 94. 75 % under the optimized conditions that particles smaller than 74 μm accounts for 90 %,CaO dosage is 3. 330 kg/t,NaCN dosage is 1. 040 kg/t and aeration rate is0. 076 m3/h. This study provides technical basis for the practical process optimization.