材料期刊网

为了研究产氨细菌浸矿条件，采用响应曲面法对产氨细菌浸出碱性铜矿石的工艺条件进行优化，并揭示各因素对铜浸出效果的影响水平及其交互作用规律。研究结果表明，采用响应曲面法的中心组合设计（ CCD ）模型对试验结果进行回归分析，响应值精确度为98．85％。各因素对铜浸出效果影响的大小为：细菌初始接种量＞助浸剂浓度＞矿浆浓度。产氨细菌浸出碱性铜矿石最佳工艺条件为：细菌初始接种量30％，矿浆浓度14％，助浸剂浓度0．04 mol/L。在此条件下，浸出144 h后，铜浸出率可达47．32％，比优化前提高了4．67％。

So as to study the leaching conditions of ammonia-producing bacteria ,the response surface methodology ( RSM) was applied to optimize the leaching process of alkaline cooper ore with ammonia-producing bacteria and un-covered the magnitude in which each factor affected the leaching effect of copper and the rules with which each factor affect the other .A central composite design ( CCD) model out of the response surface methodology was used for regres-sion analysis of the test result and the accuracy of response value is 98 .85 %.The initial bacteria inoculation has the highest level of influence on copper leaching ,followed by the leaching aid and pulp density .Based on the RSM analy-sis,the optimum conditions of the leaching process of alkaline cooper ore with ammonia -producing bacteria were:ini-tial bacteria inoculation 30%,pulp density 14%,ammonium sulfate 0 .04 mol/L as the leaching aid .Under such con-ditions,after 144 h the leaching rate of cooper was 47.32 %,which was 4.67 %higher than that before optimized .