Kaolin washing process

Product Details

Kaolin washing process is generally used for soft kaolin and sandy kaolin. The raw kaolin ore is broken up under the high-pressure impact of water. The slurry is pumped into the screw classifier to remove sand, and then sorted with a hydrocyclone. The sorted coarse concentrate is separated into paint grade and filler grade products by horizontal spiral centrifugal classifier. Coating grade products are shipped out after magnetic separation, bleaching, pressure filtration, drying and packaging and filler grade products are shipped out after pressure filtration, peeling, drying and packaging.

Main processing technology of kaolin

Kaolin processing technology generally includes beneficiation purification, ultra-fine crushing, calcination and surface modification. The original kaolin ore contains kaolinite minerals as the main components, and there are a small amount of impurities such as montmorillonite, quartz, and illite to varying degrees. Therefore, kaolin used as a mineral filler must be beneficiated and purified. The beneficiation process of kaolin depends on the type of ore.

Kaolin washing process

The original ore is added with water and dispersant according to the set concentration, and is pulped in a mixer or a pulper. The purpose of pulping is to disperse kaolin and separate it from sandy minerals and plant impurities, so as to prepare a slurry of suitable concentration for the next process.

In the raw kaolin ore, the particle size of quartz, feldspar, mica and other impurities is relatively coarse, generally larger than 325 mesh. The kaolin has a finer particle size, mainly concentrated in -2μm. The spiral classifier can remove most of the quartz and feldspar coarse sand.

Using hydrocyclone to separate and remove fine sand and other impurities. Generally, hydrocyclones with different diameters are used for multiple sorting.