Selective flocculation of kaolin: 11 am and at pH8, Ca2 + was added to the pulp kaolin, Mg2 + and other alkaline earth metal ions can be observed selectively flocculating the iron-titanium impurities, and then selectively flocculated by a polyelectrolyte weak anion. The process requires that the slurry concentration be less than 20%, so there must be a large amount of water to be removed in the subsequent operations, and the residual flocculant also has an impact on the quality of the final product. Selective flocculation of kaolin with high-molecular flocculant, the kaolin particles flocculate to the bottom, and the iron-titanium impurities are reddish brown in the suspension in the upper part due to the fine particles, and the upper suspension can be removed. Most of the iron-titanium impurities are removed and processed by other operations (such as magnetic separation) to obtain high-quality kaolin. Suzhou Kaolin Company has achieved good indicators by adopting a new process of selective flocculation. The use of selective flocculation and high gradient magnetic separation to treat kaolin also obtained satisfactory indicators.
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