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The PTMS magnetic separator process requires that the kaolin slurry concentration be less than 20%
published date: 2023/1/26

kaolin clay magnet requirements

When pH8~11, the selective coagulation of Fe-Ti impurity can be observed by adding Ca2+, Mg2+ and other alkaline soil metal ions to kaolin slurry, and then the selective flocculation can be carried out by weak anionic polyelectrolyte. The PTMS magnetic separator process requires a pulp concentration of less than 20%, so a significant amount of water must be removed during subsequent operations. Residual flocculant also affects the quality of the final product.

PTMS magnetic separator

 
The selective flocculation of kaolin is carried out with polymer flocculant. Kaolin particles flocculate each other and sink to the bottom. The iron and titanium impurities are reddish brown in the upper suspension due to the fine particles. High quality kaolin is then processed using a process called PTMS magnetic separator. Suzhou Kaolin Company adopted the new selective flocculation technology and obtained good indicators. Satisfactory results were obtained by selective flocculation and high gradient magnetic separation.

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The reagents used in the flotation of PTMS magnetic separator include: dispersant sodium silicate, pH regulator amine hydroxide and caustic soda collector Tal oil, fatty acid and calcium petroleum sulfonate. But flotation has many disadvantages, the hydrophobic carrier needs a lot of agents. The flotation process can only be effective at low pulp concentration, thus increasing the cost of dehydration. The added carrier must be removed from the clay product as much as possible and recovered from the foam product for recycling.
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