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The Influence of Silicate Bacterial Metabolites on Weathering of Silicate Minerals with Different Crystal Structures

Wang Xiulin Sun Desi Cao Fei(School of Chemistry & Environmental Engineering,Jiujiang University,Jiujiang,Jiangxi 332005)  
The difference of bacterial metabolites secreted by the selected silicate bacterium in differrent media containing silicate minerals with different structures was investigated in shake flasks.The weathering of quartz,orthoclase and kaolinite by microbial metabolites and bacteria was researched by shake flask bioleaching experiments.The results show the tested silicate minerals can promote the strain to secrete organic acids(oxalate,tartaric acid and malic acid),amino acids and polysaccharide,and stimulate the strain to produce citric acid and some specific amino acids.Kaolinite promotes the strain to secrete organic acids and polysaccharide more obviously,and orthoclase stimulates the strain to produce amino acids higher effectively than other tested silicate minerals.Amino acid mixture,organic acid mixture and polysaccharide can weather tested silicate minerals,and polysaccharide has the strongest mineral weathering ability.The complex of all metabolites can decompose minerals more effectively than amino acid mixture,organic acid mixture and polysaccharide alone.Different metabolites have a certain synergistic effect on weathering anorthose.Kaolinite with layer structure are more easily decomposed than orthoclase with framework structure by bacteria.Bacteria can more effectively weather minerals in comparison with the metabolite complex,the result shows that silicate bacteria can weather silicate minerals at the integrated operation of many microbial,physical and chemical factors.
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