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金属矿山 ›› 2019, Vol. 48 ›› Issue (02): 111-114.

• 浮选·浮选药剂 • 上一篇    下一篇

自然氧化对黄铁矿可浮性的影响及其机理研究

姜凯1,2,刘杰1,2,韩跃新1,2,李艳军1,2,朱一民1,2   

  1. 1. 东北大学资源与土木工程学院,辽宁 沈阳 110819;2. 难采选铁矿资源高效开发利用技术国家地方联合工程研究中心,辽宁 沈阳 110819
  • 出版日期:2019-02-25 发布日期:2019-04-08

Effect of Natural Oxidation on Floatability of Pyrite and Its Mechanism

Jiang Kai1,2, Liu Jie1,2, Han Yuexin1,2, Li Yanjun1,2, Zhu Yimin1,2   

  1. 1. School of Resources and Civil Engineering, Northeastern University, Shenyang 110819, China;2. National-Local Joint Engineering Research Center of Refractory Iron Ore Resources Efficient Utilization Technology,Shenyang 110819,China
  • Online:2019-02-25 Published:2019-04-08

摘要: 为了弄清黄铁矿在自然条件下的氧化规律及黄铁矿表面氧化对浮选的影响。研究了自然氧化条件下氧化时间对黄铁矿单矿物可浮性的影响,黄铁矿的回收率随着氧化时间的延长而降低。X射线光电子能谱分析(XPS)结果显示,氧化后的黄铁矿表面新出现了硫单质、硫酸铁和氢氧化铁等物质的相关特征峰,且黄铁矿氧化过程以氢氧化铁覆盖其表面为终止。浮选过程中,氧化后黄铁矿表面的氢氧化铁等亲水性物质改变了黄铁矿的表面性质,阻碍了捕收剂的吸附,降低了黄铁矿的可浮性。研究结果可以为硫化矿浮选中降低黄铁矿可浮性以实现其与贵金属等的浮选分离提供参考。

关键词: 黄铁矿, 自然氧化, XPS, 可浮性, 浮选

Abstract: In order to clarify the oxidation law of pyrite under natural conditions and the effect of surface oxidation of pyrite on flotation. The effect of oxidation time on the floatability of pyrite single mineral under natural oxidation conditions was studied. The recovery of pyrite decreased with the increase of oxidation time. The results of X-ray photoelectron spectroscopy (XPS) show that there are new characteristic peaks of sulfur, ferric sulfate and ferric hydroxide on the surface of oxidized pyrite, and the oxidation of pyrite terminated when ferric hydroxide covered its surface. During the flotation process, hydrophilic substances such as iron hydroxide formed on the surface of oxidized pyrite and changed the surface properties of pyrite, hindered the adsorption of collectors and reduced the floatability of pyrite. The results provide some references for the flotation separation of precious metal from pyrite by decrease the floatability of pyrite.

Key words: Pyrite, Natural oxidation, XPS, Floatability, Flotation