Method for separating superfine powder

Abstract

The invention provides a method for separating superfine powder, belongs to the technical field of powder classification, and particularly relates to a method for performing free particle size classification on the superfine powder by the double rotary centrifugal field technology. The method utilizes revolution difference between a rotary outer cylinder and a rotary inner cylinder to separate coarse and fine powder; a shaft of the rotary inner cylinder is a hollow shaft, namely a material introducing port; and the rotary inner cylinder provided with vanes is arranged in the rotary outer cylinder, and the vanes on the rotary inner cylinder peel particles off from the inner wall of the rotary outer cylinder so as to achieve the separation aim. The powder with the particle size between 0.1 and 14mu m is put into water to prepare solution which is fully stirred; the water is introduced into an equipment cavity through the material introducing port, and equipment is started to operate for5 minutes; and revolutions of the rotary inner cylinder and the rotary outer cylinder are set to ensure that the revolution difference is between 0.1 and 10 r / min. The method has wide usage, simple operation, short period and energy conservation, and can be widely applied to ceramic powder such as carborundum, titanium oxide, boron carbide, alumina, magnesium oxide and the like.

Description

technical field [0001] The invention belongs to the technical field of powder classification, and in particular relates to a method for classifying superfine powder with any particle size by using double-rotating centrifugal field technology. Background technique [0002] With the continuous advancement of science and technology, various ceramic powders represented by silicon carbide, boron carbide, titanium oxide, aluminum oxide, magnesium oxide, cerium oxide, etc. are more and more widely used in aerospace structural materials and armor materials. , wear-resistant materials, gemstones, cutting and polishing of semiconductor chips / solar cell substrates, high-temperature corrosion-resistant materials and other fields, the application range is increasing, and the quality requirements for powders are also getting higher and higher. The general trend of modern science and technology requirements for powder is accurate composition control and high purity, and higher requirements...

AI Technical Summary

Problems solved by technology

[0003] In my country, the water method is mainly used for the classification of ultrafine powders, but this method has disadvantages such as poor classification accuracy, long time, large water consumption, and large space occupation. What is more serious is that it is impossible to classify and collect finer powders in water. , not only will a large number of ultra-fine powders with high added value be lost, but the drainage after classification will also cause a certain degree of environmental pollution. Therefore, the ultra-fine powder industry is in great need of high classification accuracy, less water consumption and fast classification speed Advanced Ultrafine Powder Classification Technology

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