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ELECTROCHEMICAL INTERACTIONS BETWEEN SULFIDE MINERALS AND GRINDING MEDIA AND THEIR EFFECTS ON FLOTATION AND MEDIA WEAR.

机译：硫化物矿物与研磨介质之间的电化学相互作用及其对浮选和介质磨损的影响。

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摘要

The electrochemical nature of mineral-grinding media interactions in the wet grinding of one- and-two-sulfide-mineral ores was investigated with regard to the corrosive wear of the media and the flotation behavior of the minerals. Two iron sulfides (pyrite and pyrrhotite) and three types of steels (mild steel, high carbon forged steel and austenitic stainless steel) were used to represent the sulfide minerals and the grinding media, respectively. Electrochemical measurements (rest and combination potentials, galvanic currents, polarization behaviors) under abrasive and non-abrasive conditions were correlated with data from marked ball wear tests; Halimond tube flotation tests and with scanning electron photomicrographs and energy dispersive X-ray specta.;Corrosion currents obtained by superposition of polarization curves of sulfide mineral/grinding media systems were in good agreement with corrosion currents estimated from ball wear data. It was also found that freshly abraded metallic debris particles generated by abrasive wear of the grinding media lowered the corrosive wear of the media by affecting the electrochemical behavior of the minerals. This effect was particularly strong on a magnetic mineral such as pyrrhotite. The adverse effect of mineral-grinding media interactions on the floatabilities of pyrite and of pyrrhotite in the single-mineral systems was partially reversed in a two-mineral/grinding media combination. A parallelism was found between these floatability changes and the galvanic behaviors of the minerals in the two- and three-electrode systems.
机译：关于介质的腐蚀磨损和矿物的浮选行为，对一硫化物和二硫化物矿物矿石的湿磨过程中矿物研磨介质相互作用的电化学性质进行了研究。分别使用两种硫化铁（黄铁矿和黄铁矿）和三种类型的钢（低碳钢，高碳锻钢和奥氏体不锈钢）来表示硫化物矿物和研磨介质。磨蚀和非磨蚀条件下的电化学测量值（静止和复合势，电流，极化行为）与标记的球磨试验数据相关；哈里蒙德管的浮选试验以及扫描电子显微照片和能量色散X射线光谱。通过叠加硫化物矿物/研磨介质系统的极化曲线获得的腐蚀电流与根据球磨耗数据估算的腐蚀电流非常吻合。还发现由研磨介质的磨料磨损产生的新磨损的金属碎片颗粒通过影响矿物的电化学行为而降低了介质的腐蚀磨损。这种作用对磁矿物如黄铁矿特别强。矿物-研磨介质相互作用对单矿物系统中黄铁矿和黄铁矿浮性的不利影响在两种矿物/研磨介质组合中被部分逆转。在两电极和三电极系统中，这些漂浮性变化与矿物的电流行为之间发现了平行关系。

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  • 作者

    POZZO, ROBERTO LUIS.;

  • 作者单位

    University of Minnesota.;

  • 授予单位 University of Minnesota.;
  • 学科 Engineering Materials science.
  • 学位 Ph.D.
  • 年度 1987
  • 页码 171 p.
  • 总页数 171
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

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