Ammonia-producing bacteria leaching feature of alkaline copper oxide ore
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摘要: 為了研究堿性氧化銅礦產氨菌浸出特性，分析了產氨菌浸礦過程對礦石的作用.將云南某礦的堿性氧化銅礦置于含菌培養液、去菌培養液和氨水等5種浸礦溶液中，在同一條件下進行搖瓶浸礦實驗，剖析溶液中各可能的浸礦因子.研究結果表明：產氨菌產氨能力較強，尿素培養液中氨質量濃度最大達8.93 g·L-1；產氨量與細菌含量呈正相關關系，細菌含量越高，產氨量越大；產氨菌主要通過產氨間接浸礦，此外產氨菌和其代謝產物都能直接作用于礦石，浸礦能力細菌產氨 > 細菌 > 細菌代謝產物，三者比值約為12：5：4.Abstract: To investigate the leaching characteristic of alkaline copper dioxide ore by ammonia producing bacteria, the influence of the ammonia producing bacteria on the ore during the process was analyzed. To expose the possible influence factor, the shaking flask leaching test was carried out by putting alkaline cupric oxide ore from Yunnan separately into five kinds of leaching solutions, such as bacteria-containing, bacteria-removing inoculums and ammonia solution. Experimental results indicate that the bacteria have a strong ability at producing ammonia and the highest ammonia mass concentration reaches 8. 93 g·L-1. Ammonia production is positively correlated with the content of bacteria. The bacteria leach mineral mainly through producing ammonia, besides, the bacteria and their metabolites can also effect. The leaching capacity is in the order of bacteria ammonia > bacteria > bacterial metabolites, and the ratio of the three is 12:5:4.
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Key words:
- copper ore treatment /
- bioleaching /
- leaching kinetics /
- alkaline /
- ammonia
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參考文獻
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