fulltext.study @t Gmail

The leaching of pentlandite by Acidithiobacillus ferrooxidans with a biological–chemical process

Paper ID Volume ID Publish Year Pages File Format Full-Text
4355 222 2008 6 PDF Available
Title
The leaching of pentlandite by Acidithiobacillus ferrooxidans with a biological–chemical process
Abstract

The Fe3+ leaching solution which was produced by Acidithiobacillus ferrooxidas was used to leach pentlandite. The effects of several kinetic parameters including temperature, Fe3+ concentration and Cl− on Ni recovery were investigated in a container independently. The results showed that the leaching rate of Ni was favored by the rise of temperature, the increase of Fe3+ concentration and the partial replacement of SO42− by Cl−, all of which could prove the indirect mechanism for sulfides leaching. Then a bioleaching process comprising biooxidation and chemical leaching is proposed. In the biooxidation process, A. ferrooxidans was used to produce Fe3+ at 30 °C, which was then fed to the chemical process to oxidize pentlandite at 50 °C. This biological–chemical leaching process features the continuous production of Fe3+ in the bioreactor and the high temperature leaching of pentlandite in the chemical reactor. By using this process, Ni leaching rate of 83.8% was obtained at 5 days. According to the results, the present heap leaching process could be improved by the results obtained by this biological–chemical leaching process.

Keywords
Mesophiles; Biological–chemical process; Bioconversion; Kinetic parameters; Optimization; Acidity
First Page Preview
The leaching of pentlandite by Acidithiobacillus ferrooxidans with a biological–chemical process
Publisher
Database: Elsevier - ScienceDirect
Journal: Biochemical Engineering Journal - Volume 42, Issue 2, 1 November 2008, Pages 166–171
Authors
, , , ,
Subjects
Physical Sciences and Engineering Chemical Engineering Bioengineering