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The kaolin purification process can be washed, calcined, magnetically selected, and the like.
Washed kaolin production process
Washed kaolin is produced by coarsening, slurring, sieving, grinding, centrifuging, grading, chemical and possibly magnetic treatment, concentration and drying of coarse clay to achieve the desired purity, particle size and brightness. And residue. The washed kaolin is an aqueous clay that retains 14% of the bound hydrated water in the coarse clay.
Iron separator magnetic separation
In order to obtain high quality or high quality kaolin, in most cases, strong magnetic separation or high gradient magnetic separation, chemical bleaching, and even flotation and selective flocculation are required. The dyeing mineral impurities in kaolin, such as limonite, hematite, siderite, pyrite, anatase, rutile, etc., have weak magnetic properties, so the kaolin after sand removal can be further developed with a strong magnetic separator or high gradient. The magnetic separator performs magnetic separation.
Because most of the iron and titanium minerals in kaolin have a fine grain size, generally the strong magnetic separation often has a high removal rate. Therefore, most of the current industrial use of high gradient magnetic separators for magnetic separation of kaolin. In addition, the superconducting iron remover with better performance has also been used for magnetic separation and removal of iron from kaolin. This type of iron remover not only further increases the magnetic field strength, but also obtains high quality kaolin with higher quality and reduces energy consumption. After the magnetic separation of kaolin, if the whiteness index still does not meet the requirements of high-quality kaolin, chemical bleaching is generally used.
The special magnetic separator for washing kaolin is a wet magnetic magnetic separator. The magnetic strength of up to 16000 GS can remove the regenerated iron in the kaolin during the kaolin milling process to improve the whiteness. And other weak magnetic substances.
Chemical bleaching
The chemical bleaching of kaolin is often related to the performance of kaolin and the impurities contained therein. The main impurities affecting the performance of kaolin are iron minerals, titanium minerals and organic matter. Commonly used chemical bleaching methods include reduction, oxidation, oxidation-reduction combined bleaching, and acid leaching.
Calcined kaolin production process
The washed clay is used as a raw material for heat treatment (also referred to as calcination) to produce calcined clay. The washed feed clay is selected for processing based on the desired finished product requirements. The washed kaolin was ground, calcined at a temperature of 650 ° C, and ground again to reduce the molten particles formed in the calcination step. The calcination process may be flashing, the kaolin has a residence time measured in seconds in the calcination zone, or soaking (conventional), and the residence time of the kaolin in the calcination zone exceeds 30 minutes. The soaking calciner can be of vertical or rotary design and is gravity fed, while the flash calciner is typically pneumatically fed. The calcined kaolin is anhydrous.
Surface modified clays are prepared by surface coating of calcined clay with chemicals. The scope of use varies. The surface of the kaolin is reacted and later crosslinked with the intended polymer system. The surface treatment increases the chemical bond strength of the kaolin, which provides an improvement in the final product.
