生物预处理对软锰矿浮选的影响

来源期刊:中国有色金属学报(英文版)2014年第5期

论文作者:杨志超 冯雅丽 李浩然 王维大 滕 青

文章页码:1571 - 1577

关键词:浮选;软锰矿;石英;十二胺

Key words:flotation; pyrolusite; quartz; laurylamine

摘    要:研究了B. mucilaginosus 菌从软锰矿浮选脱除石英的作用,B. mucilaginosus菌对软锰矿表现出良好的选择性和回收能力。当采用十二胺为捕收剂,在pH为7时进行浮选,经 B. mucilaginosus 菌处理的石英被活化,而软锰矿则不受影响。结果表明,经 B. mucilaginosus 菌预先处理的软锰矿锰回收率较不经细菌处理的锰回收率略低,从 74.70% 降至 73.62%。但精矿品位从 17.26% 提高到19.44%。红外分析和扫描电镜结果表明,浮选效果的改善不是细菌吸附在石英或者软锰矿表面造成的。通过红外分析研究了细菌代谢物如胞外多糖、蛋白和乙酸在矿物表面的吸附。

Abstract: Bacillus mucilaginosus was used in pretreatment of pyrolusite to facilitate the flotation removal of quartz from pyrolusite minerals. Quartz was activated by B. mucilaginosus, whereas pyrolusite was unaffected at pH 7 with laurylamine as collector. Flotation recovery of pyrolusite with B. mucilaginosus pretreatment is 73.62%, slightly lower than that of the process without biopretreament, namely 74.70%. The grade of concentrate of recovered pyrolusite is 19.44%, 2.18% higher than that of the recovered pyrolusite without B. mucilaginosus pretreatment (17.26%). The results of FTIR and SEM showed that no bacteria were adsorbed on the surface of quartz or pyrolusite, indicating that the better selectivity and collectability of flotation resulted from bacterial byproducts. And interaction of bacterial byproducts such as extracellular bacterial polysaccharide, extracellular bacterial protein and acetic acid, on minerals were studied by FTIR and adsorption.

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