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《Journal of Anhui Agricultural Sciences》 2008-33
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Discussion on the Weathering Mechanism of Silicate Bacteria on Phosphorite

CHEN Shu(Key Laboratory of Solid Waste Disposal and Resource Recycle Built by Guizhou Province and Ministry of Education(Southwest University of Science and Technology),Mianyang,Sichuan 621010)  
[Objective] The aim of the research was to study the weathering effect of microorganism on phosphorite ore by taking a strain of silicate bacteria as an example.[Method] Silicate bacteria was inoculated in the liquid culture medium loaded with 100 mesh phosphorite ore.After samples were treated for different time,the mass concentration of Ca2+ in the supernatant of culture liquid was determined by using atomic absorption spectrophotometer.And the mass concentration of dissolved phosphorus(DP) was determined by phospho-molybdenum colorimetry.The residues were analyzed by electron probe,TEM and EDS after being treated with bacteria.[Result] The results indicated that the mass concentrations of Ca2+ and DP in the culture liquid increased with the prolonging of inoculation time after the withering of phosphorite ore by silicate bacteria.After withering by the bacteria,the ore powder particles were perfectly round and the edge was fuzzy after the action of bacteria.The bacteria and the organic compounds had stronger erosion action on minerals.[Conclusion] Through the analysis,it was thought that the withering of bacteria on phosphorite ore was from the mechanical breakage of the bacteria growth,the bio-degradation of extracellular secretion and the synergistic action of many kinds of factors.
【Fund】: 国家重点基础研究发展计划项目(2006CB403200);; 中国科学院重要方向重大项目(KZCX3-SW-140)资助
【CateGory Index】: S154.3
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