Silicon fine powder is made of natural quartz (SiO2) or molten quartz (natural quartz high temperature melting, amorphous SiO2 after cooling), ball mill (or vibration, air flow), flotation, pickling, high purity water Treatment of micropowder processed by multi-course process. Silicon fine powder is a non-toxic, odorless, non-polluting inorganic non-metallic material. Since it has excellent temperature resistance, alkali corrosivity, poor thermal conductivity, high insulation, low expansion, chemical performance, high hardness, and widely used in chemical, electronics, integrated circuit (IC), electrical appliances, plastics , Paint, advanced paint, rubber, defense and other fields. With the rapid development of the high-tech field, silicon micropowder will also enter the new historical development period.1 Introduction
For non-metallic mine industries, it is characterized by the diversity of minerals, and the ultrafine powder varieties of the same mineral are different. At the same time, there has been a single machine with the current ultrafine pulverized equipment, the main unit, the difference in equipment, and the manufacturer is the main plant. Due to the requirements of the process, the ultrafine comminuted machinery features, each manufacturer and its researchers have paid a lot of effort and cost, making great contributions to the rise of the ultrafine powder manufacturing equipment in my country. However, fundamentally, the technical force is weak, the introduction has no ability to digest; the gas is not harder, it is difficult to absorb, weak improvement; manufacturers with independent development and development capabilities, there are very few. Some equipment eat soft, and some are very low, energy consumption is large.
In the face of the above problems, this paper tries to discuss the performance requirements of product performance and equipment, total investment and device selection, and removal of energy consumption and equipment, processing impurities, etc., in order to properly handle ultrafine powder processing of non-metallic minerals. During the process, the problem of processing equipment, product quality, cost, mineral utilization rate. Here, product performance is the most basic for the selection of equipment, that is, the basic principles of broken grinding are specifically analyzed when the device is selected. It also provides useful reference for the manufacturer's equipment improvement.
2 Ultrafine powder product performance requirements and equipment selection
, in the process of mineral processing, ultrafine powder product performance and processing process used by the processing equipment, the formulated operation procedures, etc. The process of the process, the processing equipment used, and the formulation of the operation procedures will be different, and different mineral utilization, different production costs, different product quality, noThe same economic benefits.
Non-metallic mineral products are basically the final product. Although the purpose of processing processes also requires useful non-metallic particles to dissociate with other impurities, but it pays more attention to the quality characteristics of the final product directly processed. Therefore, it should be aimed at the origin, formation, component, structure, product requirements, etc. of the specific original minerals, etc. The laxation of this problem will certainly lead to small investment, minimal effectiveness, lose opportunities, brands and markets. Some still have a heavy loss, and there is a lot of examples in this regard.
According to the product quality, processing process parameters, the basic working principle of equipment, the selection principles of processing equipment mainly include: non-metallic particles are broken in the process of processing machinery, the power source of processing machinery, manufacturing and processing machinery Material, etc. To this end, simply discuss the characteristics of several devices to compare.
The basic working principle of the airflow pulverizer (disc, the spray, sulfide bed, and ⋯) is to use high pressure gas to carry the processed mineral particles in the pulverized cavity, friction, etc., to meet the purpose, see 1 (a). The working principle determines the particle size, material hardness, airflow speed, collision mode, discharge particle size limit, etc., which determines the grinding efficiency and product quality. Since the broken momentum is used as a gas, the energy utilization rate is greatly reduced. Compressing the air of the natural state is compressed, converting the energy or chemical energy (engine) into the energy of the compressed gas, impurities (oil, water, water, etc.), enters the pulverizing cavity release energy, and the subsequent gas energy Unable to recycle. These processes cause the energy utilization rate of the equipment to be quite low. High-pressure gas carrying the processed mineral particles in a pulverized cavity, a severe collision, friction, etc. This causes the preparation of the gas flow crushed granularity to be invested, and the pollution is usually produced here. The airflow pulverizer is small in size, and can be processed using a price and expensive non-metallic material to avoid contamination of materials when crushing, so the airflow pulverizer host can process ultrafine powder products with high purity. The pollution generated by the airflow pulverizer is from the previous process. The granular sphere of the collision produced is poor.
The basic working principle of stirring (rod, spiral, ball, and ⋯) is to utilize a stir bar and grinding mediumCutting force, extrusion processing products. The amount of heat generated by grinding is extremely hot, and the thermally sensitive mineral is often used in dry milling. The brittle material has a large abrasion capacity, and the driving force is transmitted to the grinding medium and the abrasive material by stirring, which is small, mainly as heating. Typically agitation is large, the material employed is mostly metal, in order to avoid contamination, non-metal lining and non-metallic media must be used, and the channels passing through the material should not be contacted with metal, which is easy to achieve. When grading, another additional power system and device are required. This type of model is used in wet processing effect, but the cost of drying powder is very large. It is difficult for impurities that are brought into processes.
The basic working principle of Raymond (vertex, roll mill, pulling, ...) is to use rolling force, see Figure 1 (b). Whether it is a rolling installation, lead straight arrangement, with inclination arrangement, etc., no matter whether it is rolled by the rolling assisted to improve the crushing force, there are two problems. One is a bite angle formed between the rolling and the support disk, determines the incident particle size of the crushed material to be clamped by the friction. Exceeding the particle size of the bite angle, regardless of how much pressure is applied, not only cannot crush the material, but will increase the crush phenomenon caused by the rolling of material accumulation wave and the rolling jump. The second is that with the refinement of the material, the number of material particles on the rolling roll under the contact surface increases, and the crushing force of a single material particles is drastically reduced, which greatly reduces the processing capacity of the equipment. Rolling rolls excessively pressure, giving the material selection of Raymond grinding components, reasonable application of dynamic performance and energy consumption brought difficult experience. Raymond (vertex, roll grinding, mill mill, ...) work system is subject to work mode, and impurities that remove processing incorporation becomes extremely difficult. Because it is difficult to manufacture rolling parts with large volumes of non-metallic materials, the amount of impurities is large and difficult to remove. The grading needs another additional system and equipment.
The basic working principle of high-speed impact grinding (hammer, fan type, ...) is to use the high-speed impact of the equipment and break the material through the second impact of the counters. With vigorous collision, friction, etc., this will reduce the crushing capacity with the refinement of materials. Moreover, the gap between the rotor and the stator changes due to wear, resulting in amplification of the crushing particle size. The speed of the rotor is increased to breakBroken material particles, but rotor kinetic problems have brought a lot of trouble to make and use, and materials with large processing hardness become difficult. Impact collisions have been obtained from product spheres and fluidity. Similarly, the material of the working system is limited by the working mode, which is difficult to use large-volume non-metallic materials to make impact parts, and the impurities that remove the process incorporation becomes extremely difficult.
The basic working principle of vibration grinding (vertical, horizontal, and ⋯) is to use a variety of complicated pressure such as broken media to break the material, see Figure 1 (C ). The size of the pressure can be adjusted by the excitation system, and the grinding chance of the material can be changed by adjustment of the excitation frequency, the cylinder geometry, the medium ratio, and the like. Due to the cause of machine structure and intensity, the use of useless work is brought troubles from the starting power and energy utilization, but reasonable media resonance applications can increase efficiency, and determine the resonant work point stability control. Due to the diverse, the material of the wound structure is free, and it is very convenient to bring non-metallic mine processing. The fine powder and ultrafine powder can be processed, and the hardness of the material is extremely strong, and the particle type is good, the particle size distribution is uniform and adjustable. In order to avoid pollution, non-metal lining and non-metallic media are used, and the passages passing through the material should not be contacted with metal, this is easy to achieve. When grading, another additional power system and device are required.
After analysis of the basic working principle of the equipment, the design of the equipment suitable for performance requirements for ultrafine powder products can be obtained.
3. Total investment and equipment Selection
1) Raw material hardness, can be seen from the work of the equipment, the raw material hardness is the key to the selection, thereby causing the host, auxiliary machine, infrastructure investment, and the operation fee. investment. If ultra-fine quartz powder is used in Raymond, it is necessary to pressurize (hydraulic or mechanical) system to apply sufficient pressure to be used, and the pressure is increased, and the pressure increases increases the manufacturing cost and operating cost of the equipment, especially the reliable devil and grinding disc. The sex is greatly reduced, and the failure rate of the pressurized system has increased dramatically.
2) Product particle size and granular shape, product particle size and its distribution and product granules are the most basic, most important indicators in non-metallic mineral products industry, and the product particle size distribution is mainly based on classification equipment, but Grinding equipment is greatly restricted by the material particle sets disposed during processingEfficiency and equipment productivity, thereby changing the total investment. The correlation of the granular shape and the broken method is more close, such as the high-speed impact molding, high-speed impact, is impossible, because particles having high spherical degree are required to grinding. Therefore, the ability of the airflow pulverizer here is quite weak. When the low spherical degree causes the subsequent processing of ultrafine powder, the fluidity of the material causes the powder mixing properties and the uniformity of uniformity. What equipment is controlled by particle size and granular shape, which is through a mannel or multi-stage grinding. Each time the broken crush is more reasonable, it greatly affects the size of total investment.
3) Impurity characteristics, impurity characteristics are the most taboo and difficulties in non-metallic mine processing. Treatment impurities is a problem that is difficult to solve in the total investment. Impurities can be divided into two forms, one is the native impurities, the other is the foreign hybrid incorporation during processing. For the former, it can be used to improve the purity of the original ore, in the first step, in the first step, it is used to remove the impurities in subsequent processing, which is greatly reduced. The cost of subsequent processing is obtained as high quality product quality, thereby obtaining high sales revenue and investment income. For the latter, there should be strict isolation measures, isolation methods, isolation materials, and the cost of isolation materials and their costs are not a small number without relaxing all parts of the equipment and material. In particular, isolation and selection of loads and transportation equipment is often overlooked.
Non-metallic mineral processing, the most deadly defect is impurities and removal problems, from the beginning, it should cause extremely high attention. The impurities brought by mineral mining, which have high costs for subsequent separation, sorting, processing, and demistence, greatly enhanced production costs, which has not attracted attention from processing enterprises. The extensive mining method is not only a greatly wasting of one-time resources, but also pollutes the environment, and has brought the increasing rescue to the performance of the final product. Therefore, the choice of mining and transportation equipment should pay special attention to the intrusion of impurities.
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