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微生物浸矿是提取低品位,难选次生硫化铜矿中有价元素的最有效方法之一.本研究利用嗜酸氧化亚铁硫杆菌(Acidthiobacillus ferrooxidans)浸取福建某难选次生硫化铜矿,依次开展浸矿菌富集培养实验、驯化转代实验和不同粒径配比下柱浸试验,获得了不同阶段的细菌浓度、pH值、铜浸出率等演变规律;并结合电子计算机断层扫描技术实现了柱内矿堆塌落、截面孔隙演化和浸矿机理研究.研究表明:细菌浓度和pH值均呈现缓慢增加后趋降低的趋势,浸柱中细菌增殖较慢,浸矿480 h后,细菌浓度仅为每毫升5×107个.浸矿过程中,细颗粒趋于向柱底迁移,矿堆出现塌落;柱顶孔隙率变大,增幅为6.65%,柱底孔隙率变小,降幅为8.29%;塌落程度与细粒含量成正比,最小塌落为1.7 mm,最大塌落为6.15 mm.入堆矿石粒径极大影响着柱浸体系的浸出效果.实验中柱浸B组(粒径r<1 mm占28.41%)浸矿效果最佳,浸矿480 h后铜浸出率达47.23%.
Microbial leaching is one of the most effective ways to extract valuable elements in low-grade, refractory secondary copper sulphide ore.In this study, Acaptiobacillus ferrooxidans was used to leach a refractory secondary copper sulfide The enrichment culture experiments, domestication experiments and column immersion tests with different particle size ratios were carried out successively to obtain the evolution law of bacteria concentration, pH value and copper leaching rate in different stages. Combining with computer tomography Scanning technique was used to study the slump, the pore evolution and the mechanism of ore leaching in the column.The results showed that the bacteria concentration and pH value both increased slowly and then decreased gradually.The bacterial growth in the immersion column was slow, , The bacterial concentration was only 5 × 107 per ml.During the leaching process, the fine particles tended to migrate toward the bottom of the column, and the ore deposit appeared to collapse. The porosity at the top of the column became larger with an increase of 6.65% Small, a decline of 8.29%; slump degree is proportional to the content of fine particles, the smallest slump was 1.7 mm, the largest slump was 6.15 mm. Into the ore size greatly affect the leaching effect of column leaching system column Baptist B group (particle size r <1 mm accounted for 28.41%) the best leaching, soaking After 480 h copper leaching rate of 47.23%.