Flotation iron removal technology for kaolin : The purpose of flotation operation is to float titanium impurities from kaolin.

Since the impurity particles are extremely fine, a carrier flotation process is usually employed. The carrier mineral may be calcite or silica sand (-325 mesh), and the amount of the carrier mineral is generally 10% to 20% by weight of the kaolin, and a part of the carrier may be reused.

The agents used in the flotation process include: dispersant sodium silicate, pH adjuster amine hydroxide and caustic soda collector Tal oil, fatty acid and calcium petroleum sulfonate. However, flotation has many disadvantages. The hydrophobicization of the carrier requires a large amount of chemicals. The flotation process can only be effective at a lower concentration of the slurry, thereby increasing the cost of dewatering. The loaded body must be removed from the clay product as much as possible. Recycling in the product for recycling. Chemicals and carrier minerals remaining in the clay are detrimental to the final product.

Cundy and Yong et al. studied a flotation process that does not require a carrier and floats anatase directly from kaolin, which is characterized by the presence of dispersants (such as sodium silicate) and pH adjusters (usually amine hydroxide). Under high conditions, the high pulp concentration (40% to 60% solids) is scrubbed to remove surface dirt. At the same time, the scrubbing also disintegrates the anatase and hematite from the kaolin minerals, and then traps a small amount of activators and fatty acids. The slurry is added together with the slurry, and the anatase covered by the collector forms a selective agglomeration under high shear stirring conditions, so that the particle size is significantly increased, and the slurry after high shear stirring and slurry mixing is diluted to 15%-20. The % solid is floated and the alum in the kaolin can also be removed by flotation.

Paper Coating Machine

According to the relationship bewteen Paper Making Machine and coating machine, this series of paper coating machine is divided into online coating machine and offline coating machine. For different applications of coating paper, the coating mode is divided into single-side coating and double-side coating, each side can be coated one or more times. The coating machine is mainly uses air knife coater and blade coater, consisting of unwind system, coater, drying system, gloss calender system, regulating and finishing, reeling section and transmission system etc.