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选用面包酵母菌为吸附菌株,研究了菌株吸附黄铜矿微生物浸出矿液中Cu2+的吸附富集过程,探讨了吸附试验中pH值、温度和初始菌体加入量对Cu2+吸附效果的影响。结果表明:在酵母菌吸附Cu2+的过程中,菌体细胞上的蛋白质酰胺和多糖等成分更多地参与了吸附Cu2+的过程,Cu2+与菌体表面的有机基团结合形成颗粒物沉淀附着在细胞壁上。菌株动力学吸附分析中发现,实验用各菌株对Cu2+的动力学吸附过程除了受菌株种属的影响外,还应与菌株的细胞壁形貌、菌株本身的生长状况的等因素相关。在pH=4.5、t=30℃、初始菌体加入量8.0 g/L的条件下,吸附反应14 h后酵母菌的最佳铜吸附率可达66.64%,面包酵母菌可以吸附富集黄铜矿微生物浸出矿液中的Cu2+,可以有效回收低品位黄铜矿中的铜资源。
The process of adsorption and enrichment of Cu2 + in the leachate from the chalcopyrite-leaching microorganism was studied. The effects of pH value, temperature and the amount of initial bacteria on the adsorption of Cu2 + were discussed. The results showed that during the adsorption of Cu2 + by yeast, the components such as protein amide and polysaccharide on the cell were more involved in the adsorption of Cu2 +. Cu2 + combined with the organic groups on the surface of the cell to form the pellet to deposit on the cell wall . Kinetic adsorption analysis showed that the kinetic adsorption of Cu2 + by each strain of the strain was related to the cell wall morphology of the strain and the growth status of the strain itself. The optimal copper adsorption rate of yeast was 66.64% after adsorption reaction for 14 h at pH = 4.5, t = 30 ℃ and the initial amount of bacteria added 8.0 g / L. The baker’s yeast could adsorb and enrich brass Minerals leaching Cu2 + in mineral liquid can effectively recover copper resources from low-grade chalcopyrite.