Kaolin processing technology

dispersion

In the kaolin wet-sorting process, the raw ore is firstly made into a slurry, so that the minerals are dissociated in water in the form of granular monomers, and the particle size is in micrometers or even smaller. In order to kaolinite minerals and mineral impurities (such as quartz, feldspar, mica, pyrite, titanium, iron, etc.) separation, it is necessary that the clay particles into fine, medium, coarse grain three stages. In order to make the dispersion better, it is necessary to add a suitable dispersing agent, and the mineral particles in the slurry can be effectively classified and sorted only if they are sufficiently dispersed.

Sand removal

Sand removal mainly removes coarse impurities such as quartz, feldspar, mica and other detrital minerals and cuttings, and also removes some iron-titanium minerals. It is commonly used in sputum float type classifiers, spiral classifiers, hydrocyclones and vibrating screens.

Grading

Grading is the separation of minerals by the difference in size or density of mineral particles. If the mineral sizes of the minerals are large, they are generally classified by sieves; if they are similar, they are sorted according to their density differences. Commonly used grading equipment are water rafts, hydrocyclones, centrifuges, and the like.

Magnetic separation

Almost all kaolin ore contains a small amount of iron minerals, mainly iron oxides, ilmenite, siderite, pyrite, mica and tourmaline . These colored impurities are usually weakly magnetic so that these harmful impurities can be removed by magnetic separation. Magnetic separation is a method of separating mineral particles in a magnetic field by utilizing the magnetic difference of minerals, and is effective for removing high magnetic minerals such as magnetite and ilmenite or iron scraps mixed during processing.

Flotation

The flotation method is widely used in the purification of kaolin. At present, the process and equipment are continuously improved and updated, so that the kaolin concentrate can obtain higher whiteness and meet the industrial needs.

bleach

The kaolin used as a pigment, filler and coating directly affects the value of its whiteness and brightness. The so-called bleaching is to increase the whiteness of kaolin by different means. Specific methods include magnetic separation bleaching, flotation bleaching, chemical bleaching, and the like.

Ultrafine grinding

In order to meet the high fineness requirements of kaolin in industries such as paper, plastics and rubber products, it is necessary to increase the fineness of kaolin to improve the quality of the product. The ultrafine grinding process mainly includes grinding and stripping method, high pressure extrusion method and air flow pulverization method.

Calcination processing

Calcination is a special processing method to improve the performance of kaolin. The use of calcined kaolin in the paper coating industry can increase the scattering power and hiding rate and increase the ink sucking speed. Used in cable packing to increase electrical resistivity, in the synthesis of 4A zeolite , production of aluminum chloride, cryolite industry, calcination can increase the chemical activity of kaolin. High temperature calcination can increase the whiteness and can partially replace the expensive titanium dioxide. Calcination produces mullite. For coal-based calcined Kaolinite is essential to the process, due to calcination can remove carbonaceous, improve the whiteness.

Surface modification

Kaolin is used for the filler of plastics, rubber, paint and cable. In order to make it easy to uniformly disperse with various organic polymer materials and to form a stronger bond, it is necessary to coat an organic coupling agent on the surface of kaolin. For surface modification. The kaolin with good modification effect is hydrophobic, which floats on the surface of the water without sinking.

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