Crushing and processing of kaolin

Kaolin is a non-metallic mineral, which is a kind of clay and clay rock mainly composed of Kaolinite clay minerals. It is named after Gaoling Village in Jingdezhen, Jiangxi Province. Pure kaolin is a white, delicate, and soft soil with good plasticity and fire resistance. Its mineral composition is mainly composed of Kaolinite, halloysite, hydromica, Illite, Montmorillonite, quartz, feldspar and other minerals. Kaolin is widely used, mainly in papermaking, ceramics, and refractory materials, followed by coatings, rubber fillers, enamel glazes, and white cement raw materials. A small amount is used in plastic, paint, pigments, grinding wheels, pencils, daily cosmetics, soap, pesticides, pharmaceuticals, textiles, petrochemicals, chemicals, building materials, national defense and other industrial sectors.

Basic Overview of Kaolin

Physical and chemical properties of kaolin

Physical and chemical properties: mostly dull, pure white and delicate, with impurities such as gray, yellow, brown and other colors. The appearance depends on loose soil and dense rock blocks 54-2.60 g/cm3. The melting point is about 1785 ℃. It has plasticity, and wet soil can be molded into various shapes without breaking, and can remain unchanged for a long time.

Genetic type of kaolin Ore genesis

On the basis of the genesis of kaolin Ore genesis, China's kaolin deposits are divided into three types and six subtypes according to the "Specifications for Geological Exploration of Kaolin Mines".

1. Weathering type: divided into weathering residual sub and weathering leaching sub;

2. Hydrothermal alteration type: divided into hydrothermal alteration subtype and modern hydrothermal alteration subtype;

3. Sedimentary type: it can be divided into sedimentary type and sedimentary type Kaolinite clay rock subtype weathering subtype and coal bearing stratum.

Industrial types of kaolin ore

According to its texture, plasticity, and sandy nature, it is divided into three categories:

1. Hard kaolin: Hard, non plastic, plastic after crushing.

2. Soft kaolin: soft in texture, strong in plasticity, with a high sand content of<50%;

3. Sandy kaolin: Soft in quality, weak in plasticity, with a good sand content of>50%.

Function Introduction

Pure kaolin has high whiteness, softness, easy dispersion and suspension in water, good plasticity, high adhesion, and good electrical insulation performance; Good acid solubility, low cation exchange capacity, and good fire resistance. Therefore, kaolin has become a necessary mineral raw material for dozens of industries such as papermaking, ceramics, rubber, chemical engineering, coatings, pharmaceuticals, and national defense. According to reports, Japan also uses kaolin as a substitute for steel cutting tools, lathe drills, and internal combustion engine casings. Especially in recent years, with the rapid development of modern science and technology, the application fields of kaolin have become increasingly widespread. Some high-tech fields have begun to use kaolin as a new material, and even high-temperature resistant ceramic components for atomic reactors, space shuttles, and spacecraft.

Paper calcined kaolin is made from high-quality coal kaolin as raw material, which is processed through beneficiation, ultrafine grinding, and calcination. It has complete hexagonal structure, good porosity, reasonable particle size distribution and good light scattering. Meanwhile, due to its high whiteness, low wear value, and good oil absorption, it is an excellent coating pigment in the papermaking industry. It has the characteristics of reducing production costs, improving paper performance, improving ink absorption, good compatibility with other components, and high viscosity.

raw material

Upstream raw materials: Alunite Downstream products: paste air knife coating kaolin, paste scraper coating kaolin, filler kaolin, ultra-fine calcined kaolin, anti aphid powder, latex paint, paper tube glue MLC-500 catalyst, RAG series catalyst, ORBIT series catalyst, GOR series catalyst, DVR-1 catalyst, ZC series catalyst, COMET-400 catalyst, RFC-1 catalyst.

Crushing and processing of kaolin

As for the current processing methods of kaolin, there are two methods: mechanical crushing and airflow crushing. Mechanical crushing is generally used to crush to around 300-1000 mesh sizes, but its crushing process is mechanical. Therefore, impurities such as increased iron content in the crushed fine powder have defects in industries with high purity requirements for application; Air flow pulverization effectively ensures the purity of the material and meets the industry application efficiency with high purity requirements. At the same time, the crushing fineness of the airflow crusher can reach 5000 mesh.