At present, there is no strict definition of the term ultrafine powder at home and abroad. Some people define ultrafine powders with a particle size of less than 100 microns, and others define ultrafine powders with a particle size of less than 1 micron. However, it is a common practice to refer to a powder of less than 500 mesh (ie, 30 micrometers) as an ultrafine powder because it is difficult to pulverize the solid material to such fineness by any conventional process. . The particle size of the ultrafine powder is much thinner than the diameter of a human hair (usually 70-80 microns).
The ultrafine pulverization technique is a process of pulverizing a solid substance into an ultrafine powder size. There are two methods of preparation of ultrafine powders: physical and chemical. The former can be divided into dry and wet methods. Dry superfine pulverizing equipment includes ball mill, vibrating mill, jet mill, etc. The machine includes a liquid flow pulverizer, a homogenizer, and the like. Regardless of the method used, the following conditions must be met: the product has a fine particle size and a narrow distribution, which can meet the actual requirements of production or scientific research; the product has high purity, does not contain any impurities, no pollution, no damage to the environment; Low energy consumption, simple, continuous, safe and reliable process. The use of non-metallic minerals depends on the degree of deep processing, including ultra-fine pulverization, ultra-fine grading, fine purification and surface modification. Among them, effective ultra-fine pulverization is the premise and guarantee for various deep processing. Therefore, the development of ultra-fine pulverizer technology determines the rational development and comprehensive utilization of non-metallic mineral products to a certain extent. After decades of research and development, especially in the past ten years, the non-metallic mineral industry has achieved tremendous development. Its deep processing technology has been continuously improved, narrowing the gap with industrial developed countries, and basically meeting the raw materials needed in its own industry and related fields. Quality requirements. Ultra-fine pulverization and grading technology has been able to process 10 to 1 μm of various non-metallic mineral powder raw materials as required. Most of the ultra-fine pulverization and fine grading equipment can be produced. The equipment performance and supporting technology are gradually approaching or reaching the international advanced level. Some equipments have new unique features in terms of structural performance. The preparation technology of mineral raw materials has been able to meet the special requirements of automobile, paper, rubber, plastic, machinery, ceramics, microelectronics (3) powder shape [4] [5]. Some non-metallic mineral products impose strict shape requirements on their shapes to suit different needs. For example, wollastonite for reinforcing composite materials, its ultrafine powder is required to maintain its original needle-like crystal state as much as possible, so that the wollastonite product becomes a natural short fiber reinforced material, and its aspect ratio requires 8 to 10; Because of its multi-layer structure, mica powder is used as dielectric material, high-grade pearl paint, pearlescent paint raw material and pearlescent pigment. It requires mica powder to be in the form of flakes. The diameter-thickness ratio of the obtained particles should be ensured as much as possible during the crushing process. The surface should not have too many scratches, otherwise it will affect its optical effect, its diameter to thickness ratio is 40 ~ 60; paper coating grade kaolin hopes to maintain the characteristics of flake minerals while superfine pulverization, improve the coating of powder Cloth cover ability.
The ultrafine pulverization technique is a process of pulverizing a solid substance into an ultrafine powder size. There are two methods of preparation of ultrafine powders: physical and chemical. The former can be divided into dry and wet methods. Dry superfine pulverizing equipment includes ball mill, vibrating mill, jet mill, etc. The machine includes a liquid flow pulverizer, a homogenizer, and the like. Regardless of the method used, the following conditions must be met: the product has a fine particle size and a narrow distribution, which can meet the actual requirements of production or scientific research; the product has high purity, does not contain any impurities, no pollution, no damage to the environment; Low energy consumption, simple, continuous, safe and reliable process. The use of non-metallic minerals depends on the degree of deep processing, including ultra-fine pulverization, ultra-fine grading, fine purification and surface modification. Among them, effective ultra-fine pulverization is the premise and guarantee for various deep processing. Therefore, the development of ultra-fine pulverizer technology determines the rational development and comprehensive utilization of non-metallic mineral products to a certain extent. After decades of research and development, especially in the past ten years, the non-metallic mineral industry has achieved tremendous development. Its deep processing technology has been continuously improved, narrowing the gap with industrial developed countries, and basically meeting the raw materials needed in its own industry and related fields. Quality requirements. Ultra-fine pulverization and grading technology has been able to process 10 to 1 μm of various non-metallic mineral powder raw materials as required. Most of the ultra-fine pulverization and fine grading equipment can be produced. The equipment performance and supporting technology are gradually approaching or reaching the international advanced level. Some equipments have new unique features in terms of structural performance. The preparation technology of mineral raw materials has been able to meet the special requirements of automobile, paper, rubber, plastic, machinery, ceramics, microelectronics (3) powder shape [4] [5]. Some non-metallic mineral products impose strict shape requirements on their shapes to suit different needs. For example, wollastonite for reinforcing composite materials, its ultrafine powder is required to maintain its original needle-like crystal state as much as possible, so that the wollastonite product becomes a natural short fiber reinforced material, and its aspect ratio requires 8 to 10; Because of its multi-layer structure, mica powder is used as dielectric material, high-grade pearl paint, pearlescent paint raw material and pearlescent pigment. It requires mica powder to be in the form of flakes. The diameter-thickness ratio of the obtained particles should be ensured as much as possible during the crushing process. The surface should not have too many scratches, otherwise it will affect its optical effect, its diameter to thickness ratio is 40 ~ 60; paper coating grade kaolin hopes to maintain the characteristics of flake minerals while superfine pulverization, improve the coating of powder Cloth cover ability.
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