Analysis of reasons for decline of bioleaching efficiency of spent Zn–Mn batteries at high pulp densities and exploration measure for improving performance

► Bioleaching was used for extraction of valuable Zn and Mn from the spent batteries at high pulp densities. ► Bioleaching dynamics of both Zn and Mn under different pulp densities were compared. ► Reasons for decrease of bioleaching efficiency at high pulp densities were unveiled. ► Feasible measur...

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Vydáno v:Bioresource technology Ročník 112; s. 186 - 192
Hlavní autoři: Xin, Baoping, Jiang, Wenfeng, Li, Xin, Zhang, Kai, Liu, Changhao, Wang, Renqing, Wang, Yutao
Médium: Journal Article
Jazyk:angličtina
Vydáno: England Elsevier Ltd 01.05.2012
Témata:
Bacteria
Bacteria - growth & development
Bacteria - metabolism
Bacterial leaching
Batteries
Biodegradation, Environmental
Bioleaching
Colony Count, Microbial
Density
Efficiency decline
Electric Power Supplies
energy
Environmental Restoration and Remediation
Environmental Restoration and Remediation - methods
Environmental Restoration and Remediation - standards
Extraction
growth & development
High pulp density
Hydrogen-Ion Concentration
isolation & purification
Kinetics
leaching
Manganese
Manganese - isolation & purification
Media
metabolism
methods
Oxygen
pulp
Recovery of Zn and Mn
Spectrometry, X-Ray Emission
Spent Zn–Mn batteries
Time Factors
X-Ray Diffraction
Zinc
Zinc - isolation & purification
Efficiency decline
Bioleaching
Spent Zn–Mn batteries
Recovery of Zn and Mn
High pulp density
ISSN:0960-8524, 1873-2976, 1873-2976
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Shrnutí:► Bioleaching was used for extraction of valuable Zn and Mn from the spent batteries at high pulp densities. ► Bioleaching dynamics of both Zn and Mn under different pulp densities were compared. ► Reasons for decrease of bioleaching efficiency at high pulp densities were unveiled. ► Feasible measures for improving efficiency at high pulp density of 4% were proposed. ► Extraction yields of 100% for Zn and 89% for Mn at 4% of pulp density were attained. The reasons for decline of bioleaching efficiency of Zn and Mn from spent batteries at high pulp densities were analyzed; the measures for improving bioleaching efficiency were investigated. The results showed that extraction efficiency of Zn dropped from 100% at 1% of pulp density to 29.9% at 8% of pulp density, with Mn from 94% to only 2.5%. It was almost the linear reduction of the activity of the sulfur-oxidizing bacteria with increase of pulp density that witnessed declined bioleaching efficiency of Zn; it was the complete inactivation of the iron-oxidizing bacteria at 2% of pulp density or higher that witnessed declined bioleaching dose of Mn. By means of reducing initial pH value of leaching media, increasing concentration of energy matters and exogenous acid adjustment of media during bioleaching, the maximum extraction efficiency of almost 100% for Zn and 89% for Mn at 4% of pulp density was attained, respectively.
Bibliografie:ObjectType-Article-1
SourceType-Scholarly Journals-1
ObjectType-Feature-2
content type line 23
ISSN:0960-8524
1873-2976
1873-2976
DOI:10.1016/j.biortech.2012.02.133