基于RSM的氨浸渣浮选回收银试验研究

为了有效浮选回收某氧化铜氨浸渣中的银金属,通过4因素5水平CCD响应曲面设计(RSM),选取硫化钠、组合捕收剂、组合抑制剂和活化剂用量作为自变量,浮选银精矿银品位和回收率作为响应建立模型.响应曲面分析结果表明,一次项中,活化剂用量对银精矿品位和回收率影响均最显著;二次项中,组合捕收剂和组合抑制剂间的交互作用对银精矿品位作用最显著,硫化钠用量和乙二胺磷酸盐用量间的交互作用对银精矿的回收率作用显著.响应曲面法优化结果为:硫化钠用量930.04 g/t、组合捕收剂用量416.63 g/t、组合抑制剂用量301.85 g/t、磷酸乙二胺用量为105.90 g/t,在该条件下,可获得的银精矿最大回收率为87.66;,对应的品位为877.042 g/t,同时通过试验验证.在优化结果基础上进行了三次粗选一次扫选两次精选闭路试验,试验结果较之前试验相比,回收率提高了将近2个百分点,表明响应曲面法优化取得了较好的效果.

Silver Recovery Experiment by Flotation from Ammonia Leaching Slag Based on RSM

In order to effectively recovery silver metal by flotation from copper oxide ammonia leaching residue, a 4 factors 5 level CCD response surface design was chosed.The model was established by dosage of sodium sulphide, composite collector, composite inhibitors and activators were studied as independent variables, silver flotation concentrate grade and recovery were as response.Response surface analysis results showed that activator dosage were the most significant influence on silver concentrate grade and recovery, the interaction between combination the collector and composite inhibitors dosage is the most important interaction of silver concentrate grade, and the dosage of sodium sulphide and ethylenediamine phosphate dosage is the most significant of recovery.Response surface method to optimize the result is: the dosage of sodium sulphide is 930.04 g/t, the composite inhibitor dosage 301.85g, collector dosage with 416.63 g/t and Ethylenediamine phosphate dosage is 105.90 g/t.in this condition, the maximum available silver concentrate recovery rate is 87.66%, and the corresponding grade of 877.042 g/t.Finally, according to the test, on the basis of optimization results on three roughing an scavenging twice selected closed-circuit test, test results are compared to before optimization test, recovery rate raise almost two percent point, the results show that response surface method optimization is achieved with a good results.