摘要
The application of the response surface methodology and the central composite design（CCD） technique for modeling and optimization of the influence of some operating variables on copper,molybdenum and rhenium recoveries in a bioleaching process was investigated.Three main bioleaching parameters,namely pH,solid concentration and inoculum percent,were changed during the bioleaching tests based on CCD.The ranges of the bioleaching process variables used in the design were as follows：pH1.46-2.14,solid concentration 0.95%-11.05%,and inoculum percent 1.59%-18.41%.A total of 20 bioleaching tests were carried out by the CCD method according to software-based designed matrix.Empirical model equations were developed according to the copper,molybdenum and rhenium recoveries obtained with these three parameters.Model equations of responses at the base of parameters were achieved by using statistical software.The model equations were then individually optimized by using quadratic programming to maximize copper,molybdenum and rhenium recoveries individually within the experimental range.The optimum conditions for copper recovery were pH 1.68,solid concentration 0.95% and the inoculum 18.41%（v/v）,while molybdenum and rhenium recoveries were 2.18% and 24.41%,respectively.The predicted values for copper,molybdenum and rhenium recoveries were found to be in good agreement with the experimental values.Also jarosite formation during bioleaching tests was also investigated.
运用响应面方法和中央复合旋转实验设计方法对辉钼矿生物浸出过程中影响铜、钼和铼浸出的一些工艺条件进行了建模与优化。基于中央复合旋转实验设计方法,考察了3个主要因素对生物浸出的影响,即料液pH值、矿浆浓度、接种体浓度,其值分别为:pH1.46～2.14,矿浆浓度0.95%～11.05%,接种体浓度1.59%～18.41%。根据中央复合旋转设计方法进行20组生物浸出实验。根据所得到的铜、钼和铼浸出率的实验结果,基于3个考察因素对其分别建立了经验公式。在实验条件范围内,根据经验公式采用二次方程对获得最大的铜、钼和铼浸出率的工艺条件进行了优化。结果表明,获得最大的铜浸出率的工艺条件为:pH=1.68,矿浆浓度0.95%,接种体浓度18.41%;在此条件下,钼和铼的浸出率分别为2.18%和24.41%。铜、钼和铼浸出率的预测结果与实验结果吻合较好。考察了生物浸出中黄钾铁矾生成对浸出的影响。
基金
supported by the National Iranian Copper Industry Co. and Geological Survey of Iran
作者简介
Corresponding author： H. ABDOLLAHI; Tel： ＋98-21-64592257; Fax： ＋98-912-5032335; E-mail： hadi_abdollahi2003@yahoo.com; h_abdollahi@ut.ac.ir
