微生物浸出黄铜矿适应性研究

采用微生物浸矿技术，以西部矿业黄铜矿为对象，进行了从黄铜矿中提取铜的实验研究。菌种为氧化亚铁杆菌（T.f）。先进行菌种富集制备T．f菌浸出液，用细菌摇瓶浸出法做实验，了解影响浸出率的各种技术因素。研究结果得出，西部矿业黄铜矿在一般温度（25℃）下，T．f菌浸液的起始pH值为2．5，细菌浸出效果良好，浸出率平均在40％～65％之间，最高达到67％左右。为明确了解T．f菌浸出的效果，进行了无菌化学浸出的平行实验，两组系列实验结果得出，在整个浸出过程中，有菌浸出与无菌浸出相比，前期有菌浸出占有明显优势，但在后期浸出，效果与无菌浸出相当。这是由于有菌浸出后期pH值较前期低，不利于细菌的生长繁殖，此时，浸出时应使用pH值控制器，使其pH保持在合适的范围内，就能继续高的浸出速率。

Adaptable Experiment on Extracting Copper from Chalcopyrite by Microorganism-Mining

Taking chalcopyrite from Western Mining of China for studying object, through comparative test with and without microorganism （ferribacteriales T.f ） under 25 ℃, the change regularity of Fe^3＋, Fe^2＋, pH, Eh, Cu^2＋ parameters during the experiment process by microorganism lack-wavering extracted copper from chalcopyrite was investigated in this paper. The results show that when the pH value of T.f leaching solution at the temperature of 25 ℃, the optimum leaching effect can be obtained, which the leaching efficiency is about 40-60%, the maximum 67%. As compared with leaching without microorganism, the efficiency of leaching with microorganism is superior to that without microorganism at the earlier stage, while the both efficiency is the same at the last stage. This is due to the pH value at last stage is lower than that at earlier stage, which does harm to bacteria growth. At that time in order to improve the leaching efficiency, the pH controller should be employed.