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Influence of Mg2+ on the growth and activity of sulfate reducing bacteria by Jun-ya Cao; Guang-ji Zhang; Zai-sha Mao; Zhao-heng Fang; Chao Yang; Bao-ling Han is a Engineering article available to read on EtoBox.

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Bioleaching liquors usually contain low concentration valuable metals and a major impurity (magnesium or calcium), and therefore it is a heavy burden and involves a complicated process to separate and enrich valuable metals from these liquors. An alternative process of selective precipitation of metals using H 2 S produced by sulfate reducing bacteria (SRB) is put forward. In this paper, sealed flasks were used to study the influence of Mg 2+ in the form of MgCl 2 •6H 2 O and MgSO 4 •7H 2 O on the growth and activity of SRB, and the sulfide precipitation of bioleaching liquors was also studied. The experimental results show that Mg 2+ ion concentration from MgCl 2 •6H 2 O or MgSO 4 •7H 2 O is a significant and favorable factor for SRB growth and activity. It is also demonstrated that enhanced activation of SRB by adding NaCl in liquor and the SRB have a high tolerance to salinity from NaCl. Adding MgSO 4 •7H 2 O provides a predominant condition for SRB growth, due to providing higher concentration of sulfate. The sulfide precipitation and separation of magnesium with H 2 S produced by SRB is found to be mainly dependent on the pH value and the H 2 S concentration. SRB culture solut

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Author

Jun-ya Cao; Guang-ji Zhang; Zai-sha Mao; Zhao-heng Fang; Chao Yang; Bao-ling Han

Publisher

Elsevier Science; Elsevier ; Elsevier BV (ISSN 0304-386X)

Published

2009

Language

EN

Field

Engineering (Physical Sciences)