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Ultrafine Pulverizing Technology
Non-metallic mineral and metal mining, with mineral fuels, known as the three pillars of Industrial Materials. Non-metallic Minerals Industry is a measure of the development of scientific and technological progress and industrial country developed one of the important symbols, and many industrialized countries has already exceeded the value of non-metallic mineral ore. Non-metallic mineral products because of the unique physical and chemical properties, application areas of non-metallic mineral products penetrated into almost every industrial sector and in the entire national economy plays a more important role. The use of non-metallic mineral depends on its degree of deep-processing, including the ultra-fine pulverizing, superfine grade, fine purification and surface modification, etc., which are effective for ultrafine pulverizing of the deep processing of the prerequisite and guarantee. Therefore, ultrafine pulverizer technology to a certain extent on the non-metallic mineral products decide on the rational development and utilization effects. After several decades especially in the past decade of research and development, non-metallic minerals industry has made enormous development, its deep-processing technology continues to improve, narrowing the gap with the industrialized countries has basically been able to meet their own industry and related fields of raw materials required quality requirements. Ultra-fine pulverizing and classification technology has been able to meet the demands of the 10 ~ 1μm processing various types of non-metallic mineral powder raw materials. Various types of ultra-fine pulverizing and fine grading equipment, most of all production, equipment performance and matching technology gradually approaching or reached the international advanced level, and some equipment at the structure of performance also has the unique feature of the new. Preparation of mineral raw materials technology to the automotive, paper, rubber, plastics, machinery, ceramics, microelectronics, specialty coatings, aerospace, composite materials such as industrial non-metallic materials to provide functionality.
1、The characteristics of non-metallic mineral ultrafine pulverizing
Our country's development and utilization of non-metallic minerals began in the 50s so far have been found there is the economic value of non-metallic mineral reached more than 100 kinds, producing more than 5,000 [3]. As an important industrial resources, non-metallic mineral mining minerals accounted for 70 percent of total [1]. The majority of non-metallic mineral classification smash directly for agricultural, chemical, paper, plastics, rubber and paint products. Because of a wide variety of non-metallic minerals, in accordance with its use of different products to smash particle size distribution, purity and other sectors have put forward a variety of different requirements. Therefore, ultrafine pulverizing technology must adapt to meet their particular requirements. In general, the requirements of non-metallic minerals have the following points.
(1) Fineness. Application of non-metallic mineral products require a certain degree of fineness. Such as kaolin, heavy calcium carbonate as a paper-making raw materials required for the Product Fineness-2μm, 90% whiteness> 90%; high-grade paint heavy calcium carbonate fill fineness for the 1250 head; Zirconium Silicate Ceramic Opaque as agent The average fineness required for the 0 5 ~ 1μm; wollastonite as a filler, also called its size <10μm and so on.
(2) purity. The purity requirements of non-metallic mineral products is also one of its main indicators. This means that the process may not be in smash pollution, should maintain the original composition. If you are white mineral also called white must have degrees, such as paper with calcined kaolin, talc request whiteness ≥ 90%, paper coating, filler and paint grade calcium carbonate filler with whiteness request> 90 % and so on.
(3) the shape of the special requirements of powders [4] [5]. Non-metallic mineral products and some of its shape the shape of a strict requirement in order to adapt to different needs. Enhance the use of composite materials such as wollastonite, and its ultra-fine powder requests to keep its original status of the needle crystal, so that products that serve as natural wollastonite short fiber reinforced materials, the requirements of its aspect ratio> 8 ~ 10; wet Mica Act because of its multi-layer structure is used to do many dielectric materials, high-grade pearl paint, pearl paint raw materials and pearlescent pigments, the requirements for sheet mica, crushed during the processing should be as much as possible to ensure that particles from thick diameter than , its surface should not have too many scratches, otherwise it will affect the optical effects, and its diameter thickness ratio> 40 ~ 60; paper coating grade kaolin hope that ultra-fine pulverizing at the same time maintaining the sheet of mineral properties, improve powder the ability of the coating material to cover.
Pulverizer related artilcs
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