Method for making modeling powder from NTO in recycling waste melting and casting explosives

Abstract

The invention discloses a method for manufacturing molding powder by recycling NTO in waste melting and casting explosives. The molten and cast explosives are extracted with hot water, cooled, filtered, and dried, then washed with toluene, filtered, and dried to obtain crude NTO; the crude NTO is dissolved in heated water, and the residual acid is neutralized by adding aqueous sodium bicarbonate solution dropwise, and the temperature is quickly cooled and stirred at high speed to make the NTO solid Precipitate, filter and dry to obtain NTO recrystallized product. NTO with a certain particle size was added to the binder solution to form a suspension, and the supercritical coating technology was used to prepare the modeling coarse powder. Adopt 70°C-120°C-70°C programmed heat preservation to obtain NTO-based PBX explosive molding powder. The NTO recovered by the invention has a purity of more than 99%, a recovery rate of more than 82%, and the recovery process is simple and environmentally friendly. The method of the invention improves the coating degree of the binder on the NTO crystal, not only increases the thermal safety, but also prevents the acid corrosion of the NTO to the shell of the warhead.

Description

technical field [0001] The invention belongs to the field of propellants and explosives, and mainly relates to a method for recovering NTO from NTO-based waste melting and casting explosives, and the research field of manufacturing and processing NTO-based PBX molding powder explosives. Background technique [0002] The explosives used in weapons and ammunition have a certain storage and service life. After a period of storage, the safety and reliability of its storage and use may change dramatically, thus becoming discarded explosives. In addition, the production of explosives and the upgrading of weapon systems will also produce waste explosives. In general military powers, thousands of tons to tens of thousands of tons of discarded explosives are accumulated every year. Abandoned explosives still have the characteristics of combustion and explosion, and most explosives are toxic. If they are not handled or handled improperly, they will seriously endanger human life and p...

AI Technical Summary

Problems solved by technology

[0038] The disadvantage is that the NTO molding powder prepared by supercritical coating will cause some NTO crystals to debond due to the final stage of rapid pressure relief (quick release)

[0043] (2) The process of rinsing residual acid and recrystallization to improve the crystal form of NTO crude product is more complicated, the loss of NTO is larger, and the amount of waste liquid generated is larger;

[0044] (3) The PBX explosive molding powder manufactured by the supercritical method is incompletely coated, and part of the NTO is "debonded", which increases the risk of the subsequent press-fitting process; The tensile strength and compressive strength of the explosive are easy to produce cracks under environmental stress, which affects the detonation performance of explosives;

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