期刊
GEOMICROBIOLOGY JOURNAL
卷 33, 期 3-4, 页码 179-184出版社
TAYLOR & FRANCIS INC
DOI: 10.1080/01490451.2015.1068888
关键词
Bioleaching; electroplate sludge; recovery; valuable metals
资金
- National Natural Science Foundation of China [21277012]
- Shandong Fund of Sciences and Technology for Environment Protection
- Beijing Jointly Constructed Special Project Fund
Recovery of valuable metals from electroplating sludge by bioleaching has attracted growing attention. However, extraction efficiency of metals was generally rather low even at a low pulp density of 1%-2% owing to failing to find the most suitable bioleaching system. In this work, high Ni recovery yield from electroplating nickel slag at a pulp density of 10% was attained by determining the best bioleaching process. The results showed the sulfur-A.t system exhibited the greatest extraction efficiency among the three bioleaching systems tested. The dissolved concentration of Ni and leaching efficiency reached 5400 mg/l and 90%, respectively, after 9 days of contact. Furthermore, 100% of Ni extraction was obtained at a pulp density of 10% by the sulfur-A.t system through optimizing operational conditions. Acid dissolution by biogenic H2SO4 was the dominating mechanism for Ni leaching in the sulfur-A.t system. However, other unknown leaching mechanisms also occurred which resulted in 19% Ni extraction. A direct contact between the sludge and cells was necessary for efficient Ni release by the sulfur-A.t system.
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