Abstract: 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.

Key words: 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.