A continuous crystallization device and method for spheroidizing large-particle ammonium perchlorate

Abstract

The invention discloses a continuous crystallization device and method for spheroidization of large-particle ammonium perchlorate, and belongs to the technical field of preparation processes of propellants of rockets, missiles and the like. Ammonium perchlorate is a common oxidizing agent. The continuous crystallization device comprises a crystallizer, a material circulating pump, a refined solution raw material tank, a crystallization heat exchanger, a mother liquor overflow tank, a filter, a vacuum pump and a control device. A hot ammonium perchlorate solution is subjected to continuous feeding and continuous discharging, and a product with uniform particle and qualified quality is produced. Continuous crystallization and continuous centrifugal separation processes of ammonium perchlorate are established, manual operation is reduced, and production efficiency of the product is improved; the device and the method are particularly applicable to continuous crystallization preparation ofammonium perchlorate.

Description

technical field [0001] The invention relates to a continuous crystallization process of ammonium perchlorate, in particular to a continuous crystallization device and method for spheroidizing large-grained ammonium perchlorate with a particle size of 280-450 μm, belonging to the technical field of preparation and crystallization of ammonium perchlorate . Background technique [0002] In recent years, as an oxidizing agent, ammonium perchlorate has many advantages such as high effective oxygen content, low mechanical sensitivity, good compatibility, more gas generated during explosion, no solid residue, and low cost, so it is widely used. It is used in energetic materials such as solid propellant, pyrotechnic powder, and blasting charge, and is the most important component of high-energy smokeless, high-burning rate solid propellant. People try to prepare spherical ammonium perchlorate by using physical methods in order to improve the shape of ammonium perchlorate crystals, ...

AI Technical Summary

Problems solved by technology

At present, it is difficult to produce AP products with narrow particle size distribution and spherical shape in industry. In the actual industrial production process, most of them are sieved to achieve particle size distribution.

Grading by sieving has many disadvantages. For example, AP is a high-energy oxidant. During the sieving process, due to factors such as static electricity, it is easy to cause AP to explode, causing major accidents; moreover, the sieving process prolongs the industrial production cycle and seriously reduces industrial production. efficiency

[0004] At present, the method for preparing spheroidized ammonium perchlorate mainly contains following several kinds: ①Physical grinding method: it needs a large amount of grinding medium balls, and grinding medium balls are in contact with the material being ground during grinding, which easily pollutes the processed material , the purity of spherical AP obtained is not high; ②jet milling method: the production efficiency is low, and the pipeline of the tail gas and dust collection part of the jet milling equipment is often blocked by AP powder, which is not easy to operate; ③spray drying method: the production equipment is relatively Complicated, large area, large investment, high price of atomizer and powder recovery device; ④ supercritical fluid method: high cost; ⑤ ultra-low temperature recrystallization method: during the production process, the consumption of liquid nitrogen is too large Very complex and expensive to produce

None of the above methods is suitable for large-scale continuous production

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