4.7 Article

Effect of mechanical and chemical clay removals by hydrocyclone and dispersants on coal flotation

期刊

MINERALS ENGINEERING
卷 23, 期 5, 页码 413-419

出版社

PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.mineng.2009.12.002

关键词

Coal flotation; Slime; Clay; Dispersants; Hydrocyclone; Colloid stability; DLVO forces

资金

  1. Australian Research Council
  2. BHP Billiton Mitsubishi Alliance (BMA)

向作者/读者索取更多资源

Fine minerals, mostly clays, are known to have a detrimental effect on coal flotation. This paper focuses on the effect of mechanical and chemical removals of fine minerals by hydrocyclone and dispersants on coal flotation. The experimental results showed that the flotation recovery slightly increased from medium acidic to medium alkaline ranges. The flotation experiments carried out with dispersants at different dosages showed that the dispersants did not enhance the flotation recovery significantly. However, the removal of the fine fraction from the feed using a hydrocyclone significantly increased the flotation recovery. The bubble-particle attachment tests also indicated that the attachment time between an air bubble and the coal particles increased in the presence of clay particles. These attachment time results clearly showed that the clay particles adversely affected the flotation of coal particles by covering the coal surfaces which reduced the efficiency of bubble-coal attachment. An analysis based on the colloid stability theory showed that the clay coating was governed by the van der Waals attraction and that the double-layer interaction played a secondary role. It was also concluded that the best way to increase the flotation recovery in the presence of clays was to remove these fine minerals by mechanical means such as hydrocylones. (C) 2009 Elsevier Ltd. All rights reserved.

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