材料期刊网

采用单因素试验和响应面试验方法,对金精矿中性焙烧产物的自浸金过程中Na2SO3、CuSO4、NH3·H2O、Na2CO3等添加剂浓度进行优化研究,分析各添加剂及其相互作用对金浸出率的影响规律、显著性、次序.结果表明:金浸出率随着Na2SO3浓度的增加逐渐增大,而随NH3·H2O浓度、CuSO4浓度、Na2CO3浓度的增加呈先增大后降低的趋势;CuSO4浓度和Na2CO3浓度对金浸出率的影响显著,并且CuSO4浓度的影响显著性大于Na2CO3浓度;在Na2SO30.14 mol/L、NH3·H2O 2.1 mol/L、CuSO40.06 mol/L、Na2CO30.12 mol/L最优工艺条件下,金浸出率达到96.31%,试验值与模型预测值间的误差只有0.86%,响应面优化得到的二次多项式模型是合理可靠的.同时,金精矿的中性焙烧?自浸金工艺为金的高效非氰浸出提供新思路.

The method of single experiment and response surface experiment were chosen to optimize the self-leaching process for roasted products of gold concentrate under neutral atmosphere. Different additives, such as Na2SO3, CuSO4, NH3·H2O, Na2CO3 and their concentrations were also optimized. Effects of different additives and their interaction on gold leaching rate, significance and influence order, were analyzed. The results show that gold leaching rate gradually increases as the concentration of Na2SO3 increases. However, gold leaching rate first increases and then decreases with the concentrations of CuSO4, NH3·H2Oand Na2CO3. The concentrations of CuSO4 and Na2CO3have significant effects on the gold leaching rate, and the impact of the concentration of CuSO4 upon the leaching rate is greater than that of Na2CO3. The gold leaching rate reaches 96.31% under the optimum processing conditions that the concentration of Na2SO3 is 0.14 mol/L, NH3·H2O of 2.1 mol/L, CuSO4 of 0.06 mol/L, Na2CO3 of 0.12 mol/L. The error value between the experimental and the predicted value is only 0.86%, indicating that the quadratic polynomial model deduced from the response surface methodology is reasonable. Meanwhile, the process of neutral roasting and gold self-leaching of gold concentrate provides a new way for the high-efficient non-cyanide leaching.