文献类型：期刊文献

英文题名：Characteristics of bio-desilication and bio-flotation of Paenibacillus mucilaginosus BM-4 on aluminosilicate minerals

作者：Zhao, Jiangman[1];Wu, Weijin[1];Zhang, Xu[1];Zhu, Minglong[1];Tan, Wensong[1]

机构：[1]East China Univ Sci & Technol, State Key Lab Bioreactor Engn, 130 Meilong Rd, Shanghai 200237, Peoples R China

年份：2017

卷号：168

起止页码：40

外文期刊名：INTERNATIONAL JOURNAL OF MINERAL PROCESSING

收录：;EI(收录号：20173804192169);WOS:【SCI-EXPANDED(收录号:WOS:000416501200006)】；

基金：This study was supported by the Open Project Funding of the State Key Laboratory of Bioreactor Engineering of China and the National High Technology Research and Development Program of China (No. 2007AA060904 and 2012AA061503).

语种：英文

外文关键词：Bio-desilication; Aluminosilicate minerals; Paenibacillus mucilaginosus; Bioflotation; Bioadsorption

摘要：World reserves of bauxite include vast quantities of ore which are sub-economic due to high levels of reactive silica. It would lead to the substantial loss of caustic soda during Bayer processing. With the gradual reduction of the economic reserves of high-grade ore, people began to focus on the desiliconization treatment of the low-grade ore at reasonable cost. Biodesilication by silicate bacteria (such as Paenibacillus mucilaginosus) has been known as a potential technology for its characteristics of environmental protection, energy saving and sustainable development. In this paper, one silicate bacterial isolate with high desilication ability was screened, identified, and named as Paenibacillus mucilaginosus BM-4. The optimum cultural pH and temperature of BM-4 were also determined experimentally as 8.0 and 30 degrees C, respectively. Under these optimum cultural conditicins, silicate ores were bioleached by BM-4. It seems that the stratified structures silicate ores, such as kaolinite and chlorite, were more readily to be leached by BM-4. On the other hand, the float-abilities of BM-4 on kaolinite and bauxite were also investigated. With the experimental results shown that there existed the electrostatic adsorption process between BM-4 and kaolinite, and the Langmuir isotherm adsorption process between BM-4 and bauxite. It was observed that the float-abilities of bauxite were significantly depressed by BM-4, while the those of kaolinite were enhanced. The bioflotation test of the mixture of bauxite and kaolinite (mass ratio 5:1) through BM-4 were carried out by a modified Hallimond tube. With results shown that the Al/Si ratios of this mixed minerals were improved from 3.05 to 8.60 after bacterial conditioning due to bauxite depression. Eventually, 83.0% of Al2O3 were recovered from the mixed minerals by BM-4. (C) 2017 Elsevier B.V. All rights reserved.