The washed and separated kaolin is then conveyed to another screening area, where a series of hydrocyclone separators and screens grade it.
The kaolin is then concentrated and, using flexible-membrane polyurethane plates, pressed into 34-mm-thick cakes with a 20% moisture content.
The kaolin cakes are then cut into pieces and rapidly dried in natural-gas-powered dryers. This produces kaolin powder or particles, which are then stored ready to be loaded into tankers or trucks.

Caobar also produces special micronized kaolin, a variant obtained by meticulous crushing and screening. This mineral, which is used in fibre-glass manufacture, is world-renowned for its consistently high quality.


The silica separated from the kaolin during the washing process is screened while wet to obtain a range of particle sizes suited to a variety of applications.
Caobar's silica is sold in three formats — dry, dry and screened, and micronized.
The moisture is removed in a gasfired rotary dryer with a 75-tonne-per-hour capacity.

The silica is screened to separate the products by particle size (from 0 to 4 mm). It may also be micronized, which involves dry grinding it in a plant with a 24-tonne-per-hour capacity to produce quartz with a particle size of between 10 and 125 microns.

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