how to remove iron oxide from kaolin powder

Jan 01, 2012 Iron oxide is present mainly as the following minerals goethite, hematite, magnetite, pyrite and ilmenite . These impurities can be reduced by physical separation, e.g. flotation or magnetic separation, or by chemical leaching processes using chemicals such as Na 2 SO 3, C1 2, HCl, and dithionite, etc. However, the removal efficiency of iron ...

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