Li Jiafeng, Tong Linlin, Xu Jianing, Chen Qiao, Yang Hongying
School of Mines, China University of Mining and Technology, Xuzhou, China.
School of Metallurgy, Northeastern University, Shenyang, China.
Appl Biochem Biotechnol. 2025 Apr;197(4):2258-2273. doi: 10.1007/s12010-024-05128-6. Epub 2024 Dec 26.
Electrochemical and shake flask tests were used to examine the corrosion characteristics of typical gangue minerals in biometallurgical systems and their impact on microbial communities. The results show that the solubility order of the three gangue minerals is feldspar, mica, and quartz in descending order. Their corrosion processes are mainly controlled by cathodic electron-donating processes. They are subjected to triple resistance, which is defined as solution-resistant, colloidal silica passivation, and iron precipitation (ferric hydroxide or jarosite passivation). Fe and microorganisms both greatly improve the corrosion capacity of the system for the three gangue minerals. The community diversity may rise to 9.3, 8.6, and 4.4 times that of the initial HQ0211 strain, respectively, in the presence of feldspar, mica, and quartz.. The proportions of autotrophic microorganisms Leptospirillum, Sulfobacillus, and Acidiplasma decreased significantly, and the mixed trophic archaeon Ferroplasma and heterotrophic archaeon Cuniculiplasma became the dominant microorganisms in the system. Finally, the dissolution mechanism of gangue minerals in biometallurgical systems is discussed. The results enrich the theory of the gangue mineral corrosion process, which can lay a foundation for the effective regulation of biometallurgical processes.
采用电化学和摇瓶试验研究了生物冶金系统中典型脉石矿物的腐蚀特性及其对微生物群落的影响。结果表明，三种脉石矿物的溶解度顺序为长石>云母>石英，依次递减。它们的腐蚀过程主要受阴极电子供体过程控制。它们受到三重阻力，即耐溶液性、胶体二氧化硅钝化和铁沉淀（氢氧化铁或黄钾铁矾钝化）。铁和微生物均大大提高了系统对三种脉石矿物的腐蚀能力。在长石、云母和石英存在的情况下，群落多样性可能分别提高到初始HQ0211菌株的9.3倍、8.6倍和4.4倍。自养微生物钩端螺旋菌、硫化杆菌和嗜酸菌属的比例显著下降，混合营养古菌嗜铁菌属和异养古菌穴居古菌成为系统中的优势微生物。最后，讨论了生物冶金系统中脉石矿物的溶解机制。研究结果丰富了脉石矿物腐蚀过程的理论，可为生物冶金过程的有效调控奠定基础。
