Application of response surface methodology in optimization of bioleaching parameters for high-magnesium nickel sulfide ore  

响应曲面法在高镁型硫化镍矿生物浸出工艺参数优化中的应用

作　　者：SUN Jian-zhi WU Biao CHEN Bo-wei WEN Jian-kang 孙建之;武彪;陈勃伟;温建康(GRINM Resources and Environment Tech.Co.,Ltd.,Beijing 101407,China;GRIMAT Engineering Institute Co.,Ltd.,Beijing 101407,China;National Engineering Research Center for Environment-friendly Metallurgy in Producing Premium Non-ferrous Metals,Beijing 100088,China;GRINM Group Co.,Ltd.,Beijing 100088,China)

机构地区：[1]GRINM Resources and Environment Tech.Co.,Ltd.,Beijing 101407,China [2]GRIMAT Engineering Institute Co.,Ltd.,Beijing 101407,China [3]National Engineering Research Center for Environment-friendly Metallurgy in Producing Premium Non-ferrous Metals,Beijing 100088,China [4]GRINM Group Co.,Ltd.,Beijing 100088,China

出　　处：《Journal of Central South University》2022年第5期1488-1499,共12页中南大学学报（英文版）

基　　金：Projects(51704028,51574036) supported by the National Natural Science Foundation of China。

摘　　要：The response surface methodology(RSM)was used to optimize the operating parameters during the bioleaching of Jinchuan high-magnesium nickel sulfide ore.The particle size,acid addition,pulp density and inoculation amount were chosen as the investigated parameters.To maximize the leaching efficiency of nickel,copper,cobalt and minimize the dissolution of magnesium and iron ions,the model suggested a combination of optimal parameters of particles less than 0.074 mm being 72.11%,sulfuric acid addition being 300 kg/t,pulp density being 5%and inoculation amount being 12.88%.Under the conditions,the average results of three parallel experiments were 89.43%of nickel leaching efficiency,36.78%of copper leaching efficiency,84.07%of cobalt leaching efficiency,49.19%of magnesium leaching efficiency and 0.20 g/L of iron concentration.The model indicated that the most significant factor in response of the leaching efficiency of valuable metal is the particle size,and the most significant factor in response to the leaching efficiency of harmful ions(Mg2+)is the amount of sulfuric acid addition.And according to the suggested models,no significance of the interaction effect between particle size and acid addition was shown.Under the optimized parameters suggested by models,the valuable metals could be separated from harmful ions during the bioleaching process.采用响应曲面法优化了金川高镁型硫化镍矿生物浸出过程的工艺参数,包括矿石颗粒粒度、硫酸添加量、矿浆浓度、细菌接种量等。在最大限度提高镍铜钴浸出率和降低镁铁溶出率的前提条件下,模拟给出的最佳工艺参数为:颗粒粒度小于0.074 mm的矿石占72.11%,硫酸添加量为300 kg/t,矿浆浓度为5%,细菌接种量为12.88%。在模型给出的最佳条件下,三组平行实验的平均结果为:镍浸出率为89.43%,铜浸出率为36.78%,钴浸出率为84.07%,镁溶出率为49.19%,溶液总铁浓度为0.20 g/L。模拟结果表明,对镍铜钴浸出影响最大的工艺参数为矿石颗粒粒度,对镁溶出影响最大的工艺参数为硫酸添加量。根据模型模拟结果,矿石颗粒粒度和硫酸添加量间的交互作用对各试验指标无显著影响,在生物浸出过程中,通过调节矿石颗粒粒度和硫酸添加量可以实现有价金属镍铜钴和镁的选择性浸出。

关 键 词：high-magnesium nickel sulfide ore BIOLEACHING response surface methodology particle size acid consumption 

分 类 号：TF815[冶金工程—有色金属冶金]