文献类型：期刊文献

英文题名：Adhesion properties of and factors influencing Leptospirillum ferriphilum in the biooxidation of refractory gold-bearing pyrite

作者：Liu, Jie[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, Shanghai 200237, Peoples R China

年份：2017

卷号：160

起止页码：39

外文期刊名：INTERNATIONAL JOURNAL OF MINERAL PROCESSING

收录：;EI(收录号：20170503291315);WOS:【SCI-EXPANDED(收录号:WOS:000395607600005)】；

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 (Nos. 2007M060904 and 2012M061503).

语种：英文

外文关键词：Leptospirillum ferriphilum; Biooxidation; Refractory gold-bearing pyrite; Ore adhesion ratios; Passive layer

摘要：Leptospirillum ferriphilum (L. ferriphilum) is a widely used microorganism in the commercial biooxidation process. Its ability to adhere to sulfide ores when grown in sulfide mineral substrates is very important for the entire biooxidation process. However, few studies have investigated the ore adhesion properties of L. ferriphilum. In this paper, the effects of temperature, pH and the passive layer of the sulfide ore surface on the ore adherence properties and biooxidation capacities of L. ferriphilum LJ02, which was screened by our laboratory, were investigated. The results of these experiments showed that both the contact and non-contact leaching mechanism were evident during the sulfide biooxidation process. L ferriphilum LJ02 preferred the contact leaching mechanism to the non-contact leaching mechanism. Within the experimental range of temperatures from 36 degrees C to 46 degrees C, the OAR (ore adhesion ratio) of L. ferriphilum LJ02 increased initially and then decreased with the temperature. The optimum OAR was 0.84 at 41 degrees C. Within the experimental pH range of 1.1 to 2.0, the OAR of L. ferriphilum LJ02 decreased with pH. The optimum OAR was 0.87 at pH 1.1. It was also found that the OAR of L. ferriphilum LJ02 could be reduced by the passive layer on the surface of the sulfide ore, which was generated during the biooxidation process. Moreover, it seems that the OAR of L. ferriphilum LJ02 was proportional to the sulfide biooxidation efficiency. (C) 2017 Elsevier B.V. All rights reserved.