This is a mineral clay that is often used to make porcelain, also known as “porcelain clay”. China’s content ranks third in the world, and the main components are minerals such as montmorillonite and kaolinite.
At present, my country’s processing industries for him mainly include papermaking, rubber, etc. In the application process, the most important parameter is the whiteness. Depending on the direction of application, the requirements for whiteness are also different. In papermaking, rubber and other processes, the requirements for whiteness are very high, and the average whiteness is greater than 78%. Organic matter and mineral elements such as iron and manganese have different degrees of damage to it, and will reduce whiteness to varying degrees.
1. Purification process
Improving the whiteness of kaolin is equivalent to purifying it, which can remove impurities such as quartz stone and titanium minerals. After purification, the quality of related products can be improved, so that merchants can obtain better economic benefits. At present, the main purification process in the society is to use flotation, chemical bleaching, etc. to remove organic impurities. It is difficult to obtain high-quality products through a single purification process through data investigation. Therefore, most processes are a joint process of combining several processes. Several purification processes are briefly introduced below.
1.1 Gravity separation purification process
The gravity purification process is mainly to remove organic matter, manganese, iron, titanium and other elemental impurities, reduce the negative impact of impurities on whiteness, and achieve the purpose of purification. Centrifugal process can be used to remove gangue particles, and the final goal can be achieved according to the density difference of gangue particles. It is proposed that the re-selection method of kaolin is effective, and the purpose of washing and grading to remove impurities can be achieved by using a centrifuge to wash and screen. It has very good application value. But to achieve the final product that meets the requirements, it is very difficult to rely on the gravity separation process alone. Usually, other processes, such as leaching and calcination, are required to achieve the final purification purpose.
1.2 Magnetic separation purification process
Magnetic separation purification is mostly used to remove weak magnetic impurities such as pyrite and hematite. But at this stage, my country’s environmental protection department has intensified environmental protection supervision on industrial production enterprises, so many enterprises use magnetic separation to purify kaolin. Magnetic separation is very environmentally friendly, has no environmental pollution, and does not require the use of chemicals, so it is widely used in many fields. Because the magnetic separation technology can effectively remove the weak magnetic impurity particles, it effectively realizes the magnetic separation and purification of non-metallic ores. After investigation and research, it is found that many companies use SLon vertical ring high gradient magnetic separator for purification and screening. The magnetic separator has also been improved with the advancement of science and technology. After the improvement, the reasonable control of the speed makes some parts avoid secondary pollution. . It is believed that the development of magnetic separation technology will have a good influence on improving the purification process in future production. In addition, another widely used superconducting magnetic separator equipment also has great advantages, such as high field strength and large production capacity. Experiments show that the finer the magnetic medium, the higher the field strength, the better the effect of iron removal.
2 applications
2.1 Applied Research
Because of its good performance and characteristics, it has been widely used in many fields.
2.1.1 Application in the field of ceramics
The origin of the name “porcelain clay” is closely related to the porcelain industry. As far as the current situation is concerned, it is still the most widely used field in the ceramic manufacturing industry. The quality of ceramic products is closely related to its usage. To make ceramics have better strength, stability and other properties, a certain amount of kaolin must be used. The ceramics that have been used are of higher quality than ordinary ceramics in terms of functions such as filters and water purifiers. Therefore, from this point of view alone, it is also necessary to increase the investment in scientific research for purification.
2.1.3 Application in the field of refractory materials
It can form aluminum silicate – metakaolin at high temperature. This is an important processing and manufacturing product in modern society. This product is used in many fields, such as the field of building materials. This product can effectively improve the strength of the material and has good fire resistance. In addition, our country is relatively rich in resources, which can reduce production costs while producing, so it is widely used in the field of refractory materials.
2.2 Application research of nanometer kaolin
With the development of nanotechnology, nanomaterials have also shown excellent aspects in application performance. Because of the special nano-characteristics of nano-scale kaolin particles, it has unique properties in the comprehensive aspects of application methods, and has no high application value. It is a very hot spot in applied research. It can be used in lubricants, cement and other fields, and can also be used as a stealth material. It also shows broad application prospects in the field of national defense. It is believed that nanotechnology will develop faster in the future, so that the cost of nanomaterials will continue to decrease, and the cost will also decrease in the application of kaolin, and the scope of application will continue to expand.