Method for reclaiming waste melting and casting explosive nto to manufacture passivated nto

Abstract

The invention discloses a method for reclaiming waste melting and casting explosive NTO to produce passivated NTO. 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 rapidly lowered and stirred at high speed, filtered, Dry to obtain NTO recrystallization product. The NTO recrystallized product is prepared by supercritical coating technology to obtain a passivated NTO semi-finished product, and the passivated NTO is obtained by cycling the temperature of 70°C-85°C-70°C for 5 times. 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 quality of the desensitizing agent to the NTO crystal, not only increases the thermal safety, but also prevents the NTO from corroding the warhead metal shell and oxidizing the Al powder in the explosive, and is suitable for manufacturing Al-containing explosives .

Description

technical field [0001] The invention belongs to the field of propellant and explosives, and mainly relates to a method for recovering NTO in NTO-based waste melting and casting explosives, and the research field of a passivated NTO manufacturing process that can be used to produce aluminum-containing PBX 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, which will seriously endanger life and pollute the environment...

AI Technical Summary

Problems solved by technology

[0041] The downside is that supercritical CO 2 Some of the NTO crystals in the passivated NTO prepared by coating were debonded, which was caused by the final rapid pressure release (the pressure changed rapidly from 7.38MPa to normal pressure)

[0048] (2) The processes of rinsing residual acid and recrystallization to improve the crystal form of crude NTO are more complicated, the loss of NTO is larger, and the amount of waste liquid generated is larger;

[0049] (3) The passivated NTO prepared by the supercritical method has the phenomenon of "debonding" of NTO crystals, which increases the risk of the subsequent press-fitting process; the contact of "debonding" NTO crystals reduces the tensile strength of the press-packed powder And compressive strength, it is easy to produce cracks under environmental stress, which affects the detonation performance of explosives;

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