1. Overview of
The development and use of ultra-fine pulverizers and super-segmentation machines are inseparable from the development of the non-metallic mineral industry. Especially recently, the development of China's non-metallic mineral industry and the development of the crusher industry have made superfine pulverization and super-segmentation. Technology has also been further improved. Therefore, based on the development of the non-metallic mineral industry, the current situation of China's ultra-fine pulverizers and super-segmentation machines and the market space for their development are analyzed.
2. The status quo and preparation of non-metallic mineral industry in China.
At present, China's non-metallic mineral industry has a considerable scale, and both production and export volume are on the rise. However, the quality and grade of domestically produced products are not high enough to meet the requirements of modern high-tech and new materials industry development. Many non-metallic mineral deep-processing products still rely on imports. For example, domestic high-grade glass raw materials and electronic grade spherical silicon micro-powders are completely dependent on imports. . Many of the non-metallic minerals are white minerals. The first basic requirement for deep processing is to increase the whiteness, followed by the protection of graphite scales and mineral fibers with fibrous minerals. Understand the characteristics of minerals and the requirements for their deep processing, you can skillfully combine the process to achieve energy saving, environmental protection, simplicity, and get the best concentrate grade and the best recovery rate. The purpose of ultra-fine processing of non-metallic minerals is mainly to develop the special properties of non-metallic minerals in the ultra-fine (fine) powder state.
2.1 Fully develop the various effects of small particles
The various effects of developing small particle particles are the basic purpose of our research on ultrafine powders. As ultrafine (fine) powders will bring quantum size effects, small size effects, surface effects and macroscopic quantum tunneling effects, this is the development of non-metallic natural nanomaterials (such as graphite, zeolite, kaolin, diatomaceous earth, perlite). The use of synthetic non-metallic mineral nanomaterials (such as calcium carbonate, titanium dioxide, silica, carbon black, etc.) is very important.
2.2 First high purification, and then ultra-fine
High purification is to prevent the interference of foreign impurities, and fully reflect the characteristics of the substance itself. Many products can't express their value without high purification. For example, ultrafine powder with W(SiO2) of 99.99% is currently limited to laboratory results. There is no industrial practice, and the price of imported high-grade products can reach 150,000 tons. (ZrO) is 99.999% ultra-fine powder price is more than 300 times that of ordinary refractory ZrO powder. With purity, it is possible to talk about ultra-fine, otherwise there will be fineness but insufficient purity, which is a waste of manpower, material resources and financial resources. The object of ultrafine powders 20 years ago was a powder with a particle size of 3 m or more. Ten years ago, it was a material with a particle size of 1 m or more. In recent years, it has progressed to the study of nanoscale. As the particle size becomes smaller, more properties of the material itself will also be developed.
2.3 Functionalization and compositing The possible functionalization and compositing are the result of people's pursuit of material performance, and also the demand for materials for high-tech development. People have studied and exploited the unique functions of ultrafine powders in certain aspects, while artificially giving it new functions to better serve people.
2.4 Relationship between refinement and special requirements The refinement of powder materials involves its particle size, particle size distribution, particle shape, specific surface area, pore volume, pore size, crystal phase, electrical conductivity, magnetic properties, light absorption, light conductivity, etc. A range of features. Powders with different properties have different effects in application. For example, the SiO powder that we usually use for packaging materials has different particle shapes (angular powder and spherical powder), and the packaging results are completely different; the product particle size distribution is different, and the results are also much different.
3, China's superfine pulverizer and super-segmentation machine research and development
From 1995 to 2005, China has nearly 160 patents for superfine pulverizers. It can be seen that the development of superfine pulverizers and super-segmentation machines in China.
3.1 Superfine pulverization theory and practice
3.1.1 Superfine pulverization theory research
The theory of fracture is the theoretical basis for solving the relationship between material pulverization and energy consumption, exploring the intrinsic relationship between material pulverization state and energy consumption, and guiding the manufacture of pulverizing equipment that is more conducive to smashing and energy saving, which is important for reducing energy consumption and saving energy. The theoretical research value and significant practical significance. Since the 19th century, a new concept of fracture theory has been proposed. By the 1980s, Gabalov studied the problem of energy consumption from the perspective of structural chemistry. After more than 100 years of development and improvement, the theory of crushing plays an important guiding role in the field of crushing. However, these theories have their limitations and their limitations to a certain extent. From the practical use, the three smashing theories have their respective scope of application and have a certain one-sidedness. With the development of science and technology, the existing theory lags behind practice, and the defects and shortcomings of the traditional fragmentation theory are prominent, and it has not been able to play a guiding role in many fields. For this reason, it is urgent to seek a theory that is more reasonable, more accurate, and more reflective of the actual smashing state. The process of material deformation and crushing is very complicated. It is not an isolated system, but an open system with material and energy exchange with the outside world. It is also a spiral evolution process from steady state to gradual change, accompanied by energy such as sound and heat. Dissipation. To establish a complete system and establish a material pulverization power consumption equation, a multidisciplinary theory is needed to make a foundation. Under the premise of multidisciplinary cross-combination, it is possible to establish a power consumption equation that is more complete and comprehensive, and to reveal the complex system of material smashing. The mechanism of internal evolution. Based on the fluidized bed jet mill pulverization mechanism, the influence of the working fluid pressure and the number of nozzles on the morphology of SiC particles was studied. Increasing the working medium pressure in the pulverizing chamber can increase the pulverizing strength; using two nozzles in the pulverizing chamber to increase the probability of particles colliding with each other is an effective method for preparing the flaky SiC powder. The fluidized bed type airflow milled multi-stage turbo classifier pulverizing system can prepare multi-level ultra-fine SiC platelet fine powder with good product quality. The three-dimensional viscous flow calculation software NUMECA is used to simulate the steady three-dimensional turbulent flow field in the suction chamber of the turbulent pulverizer. The pressure distribution and velocity distribution of the internal flow field of the suction chamber are obtained, which visually shows the suction chamber. The internal flow phenomenon has laid the foundation for the final machine joint calculation. The wet pulverized calcium carbonate material was tested by a composite pulverizing system consisting of a high-pressure roller mill and a stirring mill. The test results show that the system can effectively improve the fineness of the material and reduce the energy consumption, which may be related to the granules in the high-pressure roller. The micro-cracks are generated after the pressure is pressed; the pre-grinding times of the high-pressure roller mill obviously affect the final product particle size and energy-saving effect of the agitating mill; the simulation of various irregular shape particle destruction behaviors shows that the micro-cracks occur when the particles are pressed and Anisotropy is related to stress distribution. Various theoretical studies have shown that the superfine pulverization theory should have different expressions from the current three smashing theories, but how to be able to perform correctly, it is still necessary to smash the people to work together to study, and expect a complete expression formula to appear at an early date. As a professional production tips for crushers, it is necessary to pay attention to: 1 The thinking method of developing crushed fine materials equipment is different from crushing coarse-grained materials; 2 The development of ultra-fine crushing machines should be much.
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