Response surface methodology for optimization of process parameters for indirect bioleaching of valuable metals from copper and cobalt ores
In this study,based on the bioleaching of copper-cobalt ore,bioactive leach solution was used as leaching agent and re-sponse surface method was used to optimize the leaching process parameters to achieve efficient bioleaching of copper-cobalt ore.The leach system contained a mixture of Acidithiobacillus thiooxidans,Acidithiobacillus ferrooxidans,and Leptospirillum ferriphilum.After 30 sets of experimental results were statistically analyzed,it was found that the significant factors affecting the leaching of Cu and Co in copper and cobalt ores were temperature,solid-liquid ratio,initial pH,rotational speed,and the interactions of temperature-solid-liquid ratio,solid-liquid ratio-initial pH,(solid-liquid ratio)2,and(initial pH)2,and the significant factors affecting the leaching of Fe were the interactions of temperature,solid-liquid ratio,initial pH,and(solid-liquid ratio)2.In addition,the R2 of the three prediction models for the leaching rates of Cu,Co and Fe from copper and cobalt ores by bioleaching were 0.9864,0.9687,and 0.9381,respectively,which indicated that the prediction models had a high degree of realism.Finally,the optimal bioleaching parameters for copper-cobalt ore were temperature 47.08℃,1.17%solid-liquid ratio,initial pH 0.81,and rotational speed 120 r/min.Under the optimized condi-tions,the predicted values were 99.36%for Cu,91.87%for Co,and 88.43%for Fe,and the measured values were 100%,96.53%,and 86.11%,respectively.
copper-cobalt orebioleachingresponse surface methodparameter optimizationfitted model
万方数据
维普
