Guo Xiaoxiao, Chen Siming, Han Yawei, Hao Chunbo, Feng Xiujuan, Zhang Baogang
MOE Key Laboratory of Groundwater Circulation and Environmental Evolution, School of Water Resources and Environment, China University of Geosciences Beijing, Beijing, 100083, China.
MOE Key Laboratory of Groundwater Circulation and Environmental Evolution, School of Water Resources and Environment, China University of Geosciences Beijing, Beijing, 100083, China.
J Environ Manage. 2023 Jun 15;336:117615. doi: 10.1016/j.jenvman.2023.117615. Epub 2023 Mar 8.
The bioleaching process is widely used in the treatment of ores or solid wastes, but little is known about its application in the treatment of vanadium-bearing smelting ash. This study investigated bioleaching of smelting ash with Acidithiobacillus ferrooxidans. The vanadium-bearing smelting ash was first treated with 0.1 M acetate buffer and then leached in the culture of Acidithiobacillus ferrooxidans. Comparison between one-step and two-step leaching process indicated that microbial metabolites could contribute to the bioleaching. The Acidithiobacillus ferrooxidans demonstrated a high vanadium leaching potential, solubilizing 41.9% of vanadium from the smelting ash. The optimal leaching condition was determined, which was 1% pulp density, 10% inoculum volume, an initial pH of 1.8, and 3 Feg/L. The compositional analysis showed that the fraction of reducible, oxidizable, and acid-soluble was transferred into the leaching liquor. Therefore, as the alternative to the chemical/physical process, an efficient bioleaching process was proposed to enhance the recovery of vanadium from the vanadium-bearing smelting ash.
生物浸出工艺广泛应用于矿石或固体废物的处理，但对于其在含钒冶炼灰处理中的应用却知之甚少。本研究考察了氧化亚铁硫杆菌对冶炼灰的生物浸出效果。将含钒冶炼灰先用0.1 M乙酸盐缓冲液处理，然后在氧化亚铁硫杆菌培养物中进行浸出。一步浸出和两步浸出工艺的比较表明，微生物代谢产物有助于生物浸出。氧化亚铁硫杆菌表现出较高的钒浸出潜力，可从冶炼灰中溶解41.9%的钒。确定了最佳浸出条件，即矿浆浓度1%、接种量10%、初始pH值1.8和铁离子浓度3 g/L。成分分析表明，可还原、可氧化和酸溶性部分转移到浸出液中。因此，作为化学/物理工艺的替代方法，提出了一种高效的生物浸出工艺，以提高从含钒冶炼灰中回收钒的效率。
