次生硫化铜矿微生物浸出实验

发布时间：2019-01-23 12:04

【摘要】：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r1 mm占28.41%)浸矿效果最佳,浸矿480 h后铜浸出率达47.23%.
[Abstract]:Microbial leaching is one of the most effective methods for extracting valuable elements from low grade and difficult secondary copper sulphide ores. In this study, a refractory secondary copper sulphide copper deposit was extracted by (Acidthiobacillus ferrooxidans), followed by enrichment culture experiment, acclimation test and column leaching test with different particle size ratio. The evolution rules of bacteria concentration, pH value and copper leaching rate at different stages were obtained. Combined with the computer tomography technology, the caving, cross-section pore evolution and leaching mechanism of the pillar ore pile are studied. The results showed that the bacterial concentration and pH value increased slowly and then decreased, the bacteria proliferation in the leaching column was slow, and the bacterial concentration was only 5 脳 107 per milliliter after 480h leaching. During leaching, the fine particles tend to migrate to the column bottom, the ore pile collapses, the porosity of the top of the column becomes larger, the increase is 6.65, the porosity of the column bottom becomes smaller, the decrease is 8.29; The degree of collapse is proportional to the content of fine particles, and the minimum collapse is 1.7 mm, and the maximum collapse is 6.15 mm.. The particle size of the ore in the heap greatly affects the leaching effect of the column leaching system. In the experiment, the column leaching group B (the particle size r1 mm is 28.41%) has the best leaching effect, and the copper leaching rate is 47.23% after 480h leaching.
【作者单位】：北京科技大学土木与资源工程学院;北京科技大学金属矿山高效开采与安全教育部重点实验室;北京金诚信矿山技术研究院有限公司;辽宁工程技术大学安全科学与工程学院;
【基金】：国家自然科学基金资助项目(51374035,51574013,51604138) 新世纪优秀人才支持计划资助项目(NCET-13-0669) 全国优秀博士学位论文作者专项资金资助项目(201351)
【分类号】：TD925.5;TD952

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