Selective flotation of chalcopyrite and molybdenite with plasma pre-treatment
Selective flotation of chalcopyrite and molybdenite with plasma pre-treatment
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DOI：
10.1016/j.mineng.2014.07.011
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发表时间：
2014-11-01
影响因子：
4.8
通讯作者：
Sawada, Mitsuru
中科院分区：
文献类型：
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作者：
Hirajima, Tsuyoshi;Mori, Masanori;Sawada, Mitsuru
在优先浮选的预处理中，先对黄铜矿和辉铜矿进行等离子体处理，然后用pH 9的氧气鼓泡溶液洗涤。利用AFM、XPS、zeta电位和接触角等测试手段对这些矿物的表面特性进行了研究。等离子体处理后黄铜矿和辉铜矿的接触角明显减小。当用pH 9的溶液通氧洗涤时，辉绿铜矿的接触角增大，而黄铜矿的接触角保持较低。粘附力测量表明类似的行为。浮选试验结果表明，经等离子体处理后，黄铜矿和辉绿石的回收率均较低，只有辉绿石的回收率有所提高。该工艺可实现黄铜矿和辉铜矿的优先浮选。然而，在这些处理之后的黄铜矿和辉砷铜矿的混合物的浮选表明黄铜矿和辉砷铜矿都被抑制。乳化煤油的加入改变了浮选效果，使黄铜矿被抑制，而白铅矿被浮起。根据XPS、AFM等的结果，提出了选择性浮选的可能机理。（C）2014 Elsevier Ltd.保留所有权利。
For pretreatment of selective flotation, plasma treatment of chalcopyrite and molybdenite was applied then the minerals were washed by solution at pH 9 with oxygen bubbling. Surface characteristics of these minerals were investigated with AFM, XPS, zeta potential and contact angle measurements. Contact angle of chalcopyrite and molybdenite decreased a lot by plasma treatment. When they were washed with pH 9 solution with oxygen bubbling, contact angle of molybdenite increased whereas chalcopyrite one kept low. Adhesion force measurements indicated similar behavior. Result of flotation experiments indicated low recovery of both chalcopyrite and molybdenite after plasma treatment and only molybdenite recovery became higher after washing. Selective flotation of chalcopyrite and molybdenite could be achieved with this process. However, flotation of mixture of chalcopyrite and molybdenite after these treatments indicated both chalcopyrite and molybdenite were depressed. Addition of emulsified kerosene changed the flotation results where molybdenite was floated and chalcopyrite was depressed. Possible mechanism of selective flotation was proposed from the results of XPS, AFM, etc. (C) 2014 Elsevier Ltd. All rights reserved.