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基于矿物晶体结构的铝土矿细菌浸矿机制研究.pdf


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第 卷 第 期 中国矿业大学学报
42 4                           auxite samples containing silicate minerals with differ-
ent crystal structures were studied with Bacillus circulans CGMCC12.Decomposition of for-
sterite,kaolinite and orthoclase,which are the common silicate minerals in bauxite,and baux-
ite collected from Henan Province by Bacillus circulans CGMCC12was stressed using X-ray dif-
fraction and electron microscope.The results show that the ratios of Al2O3to SiO2 (A/S)in
forsterite bauxite,kaolinite bauxite and quartz bauxite are increased from 7.12to 16.15,from
6.11to 11.61and from 2.89to 13.56,respectively.But the ratios of A/S in orthoclase bauxite
and the bauxite sample collected from Henan Province are only increased from 3.69to 4.64and
from 4.90to 7.30,after a 12dbioleaching.Forsterite is much more easily decomposed than
kaolinite and orthoclase,and the orthoclase is the most difficult decomposing mineral among
testing silicate minerals by Bacillus circulans CGMCC12.After bioleaching,forsterite is gradu-
ally converted to brucite and quartz,and kaolinite is converted to diaspore and quartz,and or-
收稿日期
:2012-11-25
基金项目 国家自然科学基金项目
: (51064011 ,51264014 )
通信作者 钟婵娟 女 江西省九江市人 讲师 博

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