Bioleaching of iron from kaolin using Fe(III)-reducing bacteria with various carbon nitrogen sources
Bioleaching of iron from kaolin using Fe(III)-reducing bacteria with various carbon nitrogen sources
复制标题
使用具有不同碳氮源的 Fe(III) 还原菌从高岭土中生物浸出铁
DOI：
10.1016/j.clay.2010.01.010
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发表时间：
2010-04-01
影响因子：
5.6
通讯作者：
Chen, Zu-liang
中科院分区：
文献类型：
--
作者：
Guo, Min-rong;Lin, Yu-man;Chen, Zu-liang
研究了不同碳源和氮源对异化铁还原菌去除高岭土中铁杂质的影响。以葡萄糖、蔗糖、食用糖、麦芽糖和可溶性淀粉为碳源，对高岭土中铁杂质进行了去除，去除效果为单糖>二糖>多糖。当食用糖质量分数为5%时，高岭土中铁杂质的去除率超过50%，白度指数从61%提高到82%，表明食用糖可作为生物浸出的主体碳源，降低操作成本。添加（NH 4）（2）SO 4可加快生物浸出速率。利用X射线衍射仪（XRD）、X射线荧光分析仪（XRF）和扫描电镜（SEM）对浸矿前后的样品进行了分析。铁被选择性地从高岭土中浸出，而没有形成第二矿物相，没有观察到结构变化，但结晶度提高。(C)2010 Elsevier B. V.保留所有权利。
This paper studied the effects of different carbon and nitrogen sources on the removal of iron impurities from kaolin using dissimilatory Fe(III)-reducing bacteria (DIRB). Iron impurities in the kaolin were removed using glucose, sucrose, food-sugar, maltose and soluble starch as different carbon sources with removal efficiencies in the order: monosaccharide>disaccharide>polysaccharide. More than 50% of the iron impurities were removed from kaolin with an increase of whiteness index from 61% to 82% at 5% (mass/mass) of food-sugar, indicating that food-sugar could alternatively be used as a bulk carbon source to reduce the operational cost of bioleaching. Addition of (NH4)(2)SO4 to the bioleaching medium accelerated the bioleaching rate. The samples before and after bioleaching were examined by X-ray diffraction (XRD), X-ray fluorescence analysis (XRF) and scanning electron microscope (SEM). Iron was selectively leached from the kaolin without formation of a secondary mineral phase, structural changes were not observed but the crystallinity was improved. (C) 2010 Elsevier B.V. All rights reserved.