表面活性剂吐温80对钴精矿生物浸出的作用

研究矿物为赞比亚某钴精矿，浸矿菌种为ZY101.该菌种经长期驯化耐钴性良好，在含钴30g·L^-1的环境中正常生长.在浸出过程中，通过测量矿浆的pH值、电位值、亚铁离子浓度、菌浓度以及钴的浸出率来考察吐温80对浸出效果的影响.实验结果表明:在浸出过程中，添加表面活性剂吐温80可以加快浸出速率，提高钴的浸出率，其最佳用量为0.01%(体积分数)，此时，钴的浸出率达到93.25%.与未加吐温80的浸出体系相比，钴的浸出率提高了62%.在赞比亚钴精矿生物浸出过程中，添加吐温80催化效果良好.

Effects of Surfactant Tween 80 on the Bio-Leaching of Cobalt Concentrate

The cobalt concentrate from Zambia were studied. Bacteria used in the leaching was ZY101， a kind of mixed bacteria which can grow normally in the system containing 30 g·L^-1 cobalt after a long time of domestication. During leaching of cobalt concentrate， the effects of surfactant Tween 80 were evaluated by measuring the pH value of solution， the electric potential value of solution， the density of Fe²⁺， the density of bacteria cell in solution and the rate of cobalt leached. The results showed that Tween 80 can improve the leaching of the cobalt concentrate and the optimal dosage is 0.01%(volume concentration). After leaching for 15 days， the rate of cobalt leached reaches 93.25%. Compared with the system of bioleaching solution without Tween 80， the rate of cobalt leached increases by 62%. During the bio-leaching of Zambian cobalt concentrate， the addition of Tween 80 exhibits good catalytic effect.