Process for producing crude selenium powder

Abstract

The invention relates to a process for producing crude selenium powder and belongs to the technical field of mechanical pulverization. The process comprises the following steps of: grinding selenium ingot into a selenium lump material of which the particle diameter is less than 30mm, feeding the selenium lump material into a coarse grinder, and performing primary coarse grinding and secondary coarse grinding, wherein the granularity of the selenium particles which are subjected to primary coarse grinding is less than 10mm, the granularity of the selenium particles which are subjected to secondary coarse grinding is less than 3mm, and the feeding speed of the coarse grinder is 150 to 300kg / h, feeding the selenium particles which are subjected to secondary coarse grinding to a micro-grinder, and performing micro-grinding, wherein the processing amount of the micro-grinder is 30 to 60kg / h; collecting flying selenium powder by using a cloth bag or by water absorption; and sieving the selenium powder which is subjected to micro-grinding by using a vibration sieve of 200 to 400 meshes to obtain siftage, namely an acceptable product, and returning oversize products to micro-grinding processes and continuously grinding. The invention has the advantages that: by the process, selenium powder can be effectively prevented from being bonded in a grinding process, the grinding and sieving efficiencies are improved, and all the products meet the industry standard of selenium products, product yield is high, equipment maintenance cost is reduced, and the crude selenium powder can be continuously produced.

Description

Technical field: [0001] The invention relates to a production process of coarse selenium powder, which belongs to the technical field of mechanical pulverization. Background technique: [0002] Since the 20th century, the use of selenium is becoming more and more extensive, especially in the manufacture of semiconductor devices, optoelectronic devices, selenium solar cells, laser devices, lasers and infrared photoconductive materials. In the development of new technologies for photoelectric applications, selenium is a typical photosensitive semiconductor material, which is used to make selenium photocells, selenium rectifiers, etc. In the development of new materials, adding a small amount of selenium can improve the machinability of carbon steel, stainless steel and copper alloy. [0003] At present, selenium products produced by various production processes are mainly sold in the form of casting ingots, and some customers also hope to provide selenium powder products. Th...

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Problems solved by technology

[0004] The purpose of the present invention is to overcome the problems of equipment bonding, difficulty in selenium powder screening, and difficulty in meeting the industry standard of selenium powder in the existing coarse selenium powder production process, and to provide a kind of crushing and screening with high efficiency, and the product is 100% Coarse selenium powder production process in line with selenium product industry standards

The present invention effectively solves the problem of selenium powder sticking during the crushing process by controlling the feeding speed and the feeding granularity, and utilizing the circulating water cooling and ventilation cooling measures of the micro-grinding equipment, improves the crushing and screening efficiency, and obtains 200 -400 mesh selenium powder products

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