Challenges And Trends In Ultra-Fine Pulverization Technology
2018-10-08
At present, the main challenges faced by ultra-fine powder processing technology are:
1.The demand for ultrafine powders less than 1 μm is rapidly increasing;
2.Large-scale production of ultra-fine powder requires large-scale and intelligent equipment to reduce energy consumption per unit product and stabilize product quality;
3.Large-scale production of ultra-fine powders and strict product particle size distribution require fine grading equipment with large processing capacity, high classification efficiency and low energy consumption;
4.The processing of high-hard and ultra-fine powder materials and the continuous improvement of product purity requirements require that the wear of ultra-fine pulverization and fine grading equipment is significantly reduced;
5.Production of special grain shapes (needle and sheet) and tough ultrafine powders.
In order to meet these challenges, the main development trends of ultrafine grinding equipment in the future are:
(1) Improve product fineness and reduce equipment crushing limit
At present, the demand for ultra-fine powder (including nano-powder) processing technology (including milling technology and surface treatment technology) and equipment below 1 μm in the market is increasing. Ultrafine powders (including nano-powders) are one of the main development trends of ultrafine powders in the future. This is because the development of many modern high-tech and new materials requires ultra-fine powders, such as aerospace stealth materials, (tough) advanced ceramics, absorbing materials, functional fibers, environmental protection materials, biomedical materials and so on. Therefore, it is required to develop an industrialized ultrafine pulverizing apparatus having a product particle size of less than 1 μm, a low pulverization limit, and an industrial fine grading apparatus having a small gradation limit particle size and a supporting production technique.
(2) Improve single machine output and reduce energy consumption per unit of product
Due to the increasing demand for ultra-fine powder products, especially the increase in user usage (such as the annual demand for paper pigments in large paper mills of more than 100,000 tons) and the improvement of product quality stability requirements, large equipment Market demand is on the rise. Large-scale equipment adapts to the trend of large-scale powder processing plants to large-scale development, and has the advantages of low energy consumption per unit product, good product quality stability and convenient management; foreign developed countries have already developed large-scale automatic control of the whole process. Fine pulverization and fine grading equipment, such as ultra-fine pulverization and grading equipment with an annual output of 50,000-100,000 tons of ultra-fine heavy calcium carbonate, large vertical mixing mill of more than 5000L, large-scale lining with a total volume of 10m3 and a processing capacity of 150m3/h Agitated ball mill (this mill processes d80 = 9.7 μm slurry product energy consumption is about 65 kW·h / t). Large-scale equipment is one of the main ways to increase the output of a single machine and reduce the energy consumption per unit of product. In addition, the application of modern technology to develop new ultra-fine pulverizing equipment is also one of the main directions to improve pulverization efficiency, output and reduce energy consumption per unit of product.
(3) Reduce wear
Ultrafine pulverizing and fine grading equipment are generally high-speed running equipment, and high-speed running equipment is inevitably worn (consumed) during the action with the material being ground or pulverized. Abrasion not only contaminates the pulverized material (this contamination is often difficult to remove by physical means), but also affects the service life of the parts in contact with the equipment and increases the production cost. Therefore, reducing wear is an eternal issue in the development of ultra-fine pulverizing equipment.
(4) High stability and reliability
The stability and reliability of ultra-fine pulverizing and fine grading equipment are the requirements of ultra-fine pulverizing production lines, and are also the inevitable requirements of high-performance equipment. It has an important impact on production cost, efficiency, production safety and product quality.
(5) Online regulation of product fineness and particle size distribution
On-line regulation of product fineness and particle size distribution is one of the prerequisites for intelligent control of ultra-fine crushing production lines. The modern ultra-fine powder processing factory pursues the adjustment of product varieties and product programs according to market demand. Therefore, it requires a certain range of adjustability and adaptability of processing equipment, and requires automatic adjustment of working conditions to avoid the hysteresis and instability of manual adjustment. Sex.
(6) Efficient fine and large grading equipment
At present, the demand for fine grading equipment with small grading limit particle size, narrow product particle size distribution and high classification efficiency is steadily increasing. The production of ultrafine powder products with fine particle size and narrow distribution mainly depends on fine grading equipment. The market demand for ultrafine powder and particle size distribution and the requirement for integration or integration with large superfine pulverizing equipment require small grading limit particle size. Large-scale fine grading equipment with narrow product particle size distribution and high classification efficiency. Therefore, high-efficiency fine and large-scale grading equipment is one of the main development trends of future fine grading equipment.
(7) Superfine crushing equipment for special granular and tough materials
The special granular ultra-fine powder has special functions, and the added value of the product is high, which requires special processing technology and equipment. However, the ultra-fine powder has high performance processing equipment. In addition, in today's society, high-polymer composite materials are used in large quantities. In the future, the recycling and reuse of waste polymer-based composite materials requires ultra-fine pulverization of these tough materials, which is a promising market.
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