Kaolin

What is kaolin

Kaolin is a common clay mineral in nature, and also a very important non-metallic mineral. Because of its white color, it is also known as dolomite. The pure kaolin is white, fine and soft, with good plasticity, fire resistance, suspension, adsorption and other physical properties. The world is rich in kaolin resources, with a total amount of about 20.9 billion tons, which is widely distributed. China, the United States, the United Kingdom, Brazil, India, Bulgaria, Australia, Russia and other countries have high-quality kaolin resources. China's Kaolin mineral resources rank in the forefront of the world, with 267 proven mineral producing areas and 2.910 billion tons of proven reserves.

Application of kaolin

With the continuous development of economy, kaolin plays an increasingly important role in social production. It is an essential mineral raw material for national economic construction. It is also widely used in rubber, plastics, refractories, petroleum refining and other industrial sectors, as well as in the fields of agriculture and national defense.

1. Paper industry:

When kaolin is used in papermaking, it can give the paper good covering performance and good coating gloss, and can increase the whiteness, opacity, smoothness and printability of paper, which greatly improves the quality of paper.

2. Ceramic industry:

The application of kaolin in the field of ceramics is beneficial to the formation of mullite, improving its chemical stability and sintering strength.

3. Petrochemical industry:

Kaolin can be used as a catalyst carrier for petroleum cracking with high purity.

4. Coating industry:

The main function of kaolin in paint is filler and pigment substitute.

5. Rubber field:

Nano kaolin can improve the properties of rubber such as elasticity, flexure resistance, dimensional stability and compression deformation.

6. Agriculture:

The application of kaolin aqueous solution in fruit trees, grain, vegetables and other agricultural fields can greatly reduce production costs and reduce pesticide residues in crops.

Technological process of kaolin milling

The first stage: crushing of raw materials

The large kaolin material is crushed by the crusher to the feed fineness (15mm-50mm) that can enter the mill.

The second stage: grinding

After crushing, the small pieces of kaolin are sent to the storage hopper by the elevator, and then they are evenly and quantitatively fed into the grinding chamber of the mill for grinding by the feeder.

Stage three: grading

The milled materials are graded by the grading system, and the unqualified powders are returned to the host machine for regrinding after being graded by the classifier.

Stage 4: collection of finished products

The powder meeting the fineness will flow through the pipeline into the dust collector for separation and collection. The collected finished powder will be sent to the finished product bin by the conveying device through the discharge port, and then packaged by powder loading tanker or automatic packer.