嗜热菌浸出镍铜硫化矿精矿工艺研究
文献类型：学位论文
| 作者 | 赵月峰 |
| 学位类别 | 硕士 |
| 答辩日期 | 2003 |
| 授予单位 | 中国科学院过程工程研究所 |
| 授予地点 | 中国科学院过程工程研究所 |
| 导师 | 方兆珩 |
| 关键词 | 生物浸出 镍铜硫化矿精矿 中度嗜热菌 极度嗜热菌 工艺条件 |
| 其他题名 | Bioleaching Ni-Cu Sulfide Concentrate with Thermophilic Bacteria |
| 学位专业 | 化学工艺 |
| 中文摘要 | 探索用细菌浸出法处理金川有色金属公司的镍铜硫化精矿,以提取中有价金属镍铜和钴等的可行性,是综合利用金川矿产资源的重要研究课题之一.该课题是国家自然科学重点基金项目"低品位复杂矿生物冶金的基础研究"工作的一部分,主要考察嗜热菌对金川镍铜硫化矿精矿的浸出效果.实验用矿样取自金川有色公司镍铜硫化矿浮选精矿,其中主要有价金属含量为Ni7.33%、Cu3.68%、Co0.17%.实验用氧化亚铁硫杆菌(T.f)和中度嗜热菌MLY由中科院微生物所提供;中度嗜热菌S.t菌和A.f菌、极度嗜热菌A.b菌由德国菌种保藏中心提供.该论文的主要工作包括:对比三株中度嗜热菌对镍铜硫化矿精矿的浸出效果;考察工艺条件对浸矿效果较好的S.t菌浸出镍铜硫化矿精矿的影响;探索S.t菌浸出精矿过程的强化措施;比较混合中度嗜热菌在气升式反映器和通气搅拌式反映器中对镍铜硫化矿精矿的浸出效果;考察工艺条件和添加物对极度嗜热菌A.b浸出镍铜硫化矿精矿的影响. |
| 英文摘要 | The feasibility for extraction of valuable metals (Nk Ciu Co etc.) from Jinchuan Ni-Cu sulfide concentrate through bacterial leaching process is one of important research projects concerning with comprehensive utilization of Jinchuan mineral resources. The work in this thesis is part of the project "Basic Researches on Bioleaching of Low Grade Complex Ore", which is supported by the National Natural Science Foundation of China, and is focused on bioleaching of Ni-Cu sulphide concentrate with thermophilic bacteria. The Ni-Cu sulfide concentrate used in this study was obtained from Jinchuan Non-ferrous Metals Corp. and with the main metal contents: Ni 7.33%, Cu 3.68% and Co 0.17%. Five strains of bacteria were involved in this research, the mesophile T.f, moderate thermophile MLY (provided by Institute of Microbiology, Chinese Academy of Sciences), moderate thermophile S.t, A.f and extreme thermophile A.b (purchased from German Collection of Microorganisms and Cell Cultures (DSMZ)). The contents in this thesis include: comparing the behaviors for the three strains of moderately thermophilic bacteria in bioleaching of Ni-Cu sulfide concentrate; searching for the conditions more favorable for S.t to leach concentrate; determining the leaching performance in air-lift reactor and in air-bubble agitated reactor; developing methods to improve the leaching process; exploring the favorable condition and appropriate addicitves for leaching Ni-Cu sulfide concentrate with extremely thermophilic bacteria A.b. From above works the following conclusions are obtained: (1) The moderately thermophilic bacteria S.t, MLY and A/are remarkably different in their behavior in leaching Ni-Cu sulfide concentrate at their respective optimal growth conditions. S.t shows distinguished leaching performance among the three stains. The strain of S.t adapted in ore slurry achieved more satisfactory extraction than either strain adapted in substrates containing Ni2+ or Cu2+, with Ni and Cu dissolved 86.22% and 89.95% respectively after 8 days. The adapted S.t gains stable leaching capability after subcultured in ore pulp repeatly for 45 days. The adapted strain with the initial inoculum of S.t vs MLYvs A./in 1:1:1 proportion is more suitable for leaching than single adapted S.t. Leaching at temperature 50-55 °C and pH2.0 is more favorable for mineral dissolution when S.t is employed to leach Ni-Cu sulfide concentrate. Bacterial inoculum slightly affects the dissolution of Ni and Cu and. is better in the range from 5% to 15%. Lower pulp density and finer ore particles benefit the extraction of Ni and Cu. The effects of additives on the leaching of Ni-Cu sulfide concentrate with S.t are also inverstigated. By addition of 5g/L Fe3+, the dissolution of Cu is improved, while the dissolution of Ni is reduced slightly. The dissolution of both Ni and Cu is reduced by using high-salt concentration substrates, such as Norris and 9K substrates. By addition of yeast extract, the dissolution of Ni is little affected, but the dissolution of Cu is inhibited notably. The addition of glucose shows no effect on the dissolution of Ni and Cu. The leaching of Ni-Cu sulfide concentrate is enhanced when a small amount of surface active agent, such as calcium lignosulphonate, is added, but it is hindered if a large amount of calcium lignosulphonate is added. When the pulp density is increased, the lag period appears longer, therefore the dissolution of minerals becomes slow and the acid consumption is reduced as well. When the concentrate is bioleached under 15%(w/v) pulp density, the leached Ni, Cu and Co in the air-lift reactor are 69.95%, 78.38% and 70.68% respectively in 7 days, while in air-bubble agitated reactor are 80.68%, 84.38% and 83.65%. Obviously the air-bubble agitated reactor is much better than air-lift reactor in terms of leaching Ni-Cii sulfide under the pulp density 15%. The reason for this difference might be that the turbulence in the air-lift reactor is so violent that suppresses the viability of bacteria and slows down the dissolution of minerals, although the chemical leaching in the air-lift reactor appears better, as seen from its highter Eh values. Comparing with S.t and T.f, the exetremely thermophilic bacteria A.b achieves much fast rate when it is used to leach Ni-Cu sulfide concentrate. Under the condition of 68°C, pH1.6, inoculum 10% and pulp density 5%(w/v), almost all of Ni and Cu in the concentrate is leached in 4.5 days. The conditions, such as pHl .2-1.6, inoculum 10-20%, low pulp density and finer ore particles, are more favorable for the dissolution of Ni and Cu. Addition of 0.005-0.02%(w/v) yeast extract and l-5g/L Fe3+ is helpful for the extraction of Ni and Cu. |
| 语种 | 中文 |
| 公开日期 | 2013-09-16 |
| 页码 | 70 |
| 源URL | [http://ir.ipe.ac.cn/handle/122111/1359]  |
| 专题 | 过程工程研究所_研究所（批量导入） |
| 推荐引用方式 GB/T 7714 | 赵月峰. 嗜热菌浸出镍铜硫化矿精矿工艺研究[D]. 中国科学院过程工程研究所. 中国科学院过程工程研究所. 2003. |
入库方式： OAI收割
来源：过程工程研究所
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