Method for reclaiming aluminum powder from composite propellant

A technology for recycling aluminum and propellant, applied in the direction of improving process efficiency, etc., can solve problems such as inability to solve scrap composite solid propellant, aluminum powder easily oxidized recovery rate, unfavorable environmental protection, etc., and achieves good industrialization prospects and low prices. , the effect of high recovery rate

Inactive Publication Date: 2012-03-14
BEIJING UNIV OF CHEM TECH +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Incineration, blasting, heat recovery and other methods produce a large amount of three wastes, which is not conducive to environmental protection; designing new materials with recyclable functions cannot solve the existing scrapped composite solid propellants; ammonium perchlorate, aluminum powder and other components are used as The recycling of the center is the most realistic and meaningful method at present
In the research of recycling methods, it is found that the existing recycling methods of aluminum powder have the problems of complex process, easy oxidation of aluminum powder and low recovery rate.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] Water removal step: soak the water contained in the composite solid propellant without ammonium perchlorate with dichloromethane, the soaking time is 2h each time, the soaking temperature is 80°C, and the soaking times are 3 times;

[0021] Acid treatment step: The composite solid propellant after the water removal step is placed in a 25% nitric acid solution for treatment, the treatment temperature is 20°C, and the treatment time is 12h to remove the organic matter on the surface of the aluminum powder;

[0022] Separation step: put the composite solid propellant after the acid treatment step in a separation liquid, the separation liquid is prepared by reacting sodium hydroxide and ethylene glycol, the concentration is 0.05M, and the heating temperature is 50 ℃, The heating time is 5h, the polymer matrix becomes hard and brittle, easily crushed, and floats on the surface of the separation liquid. At the same time, the aluminum powder is separated from the polymer matrix...

Embodiment 2

[0024] Water removal step: soak the water contained in the composite solid propellant without ammonium perchlorate with N,N-diylacetamide, the soaking time is 3h each time, the soaking temperature is 60°C, and the soaking times are 3 times;

[0025] Acid treatment step: The composite solid propellant after the water removal step is placed in a 65% nitric acid solution for treatment, the treatment temperature is 30 ° C, and the treatment time is 1 h to remove the organic matter on the surface of the aluminum powder;

[0026] Separation step: put the composite solid propellant after the acid treatment step in the separation liquid, the separation liquid is prepared by reacting sodium hydroxide and ethylene glycol, the concentration is 0.5M, and the heating temperature is 80 ℃, The heating time is 0.5h, the aluminum powder will sink to the bottom of the container, the polymer matrix will become hard and brittle, easily broken, and float on the upper layer of the separation liquid....

Embodiment 3

[0028] Water removal step: soak the water contained in the composite solid propellant without ammonium perchlorate with 1,2-dichloroethane, the soaking time is 5h each time, the soaking temperature is 10℃, and the soaking times are 2 times;

[0029] Acid treatment step: The composite solid propellant after the water removal step is placed in a 35% nitric acid solution for treatment, the treatment temperature is 25°C, and the treatment time is 6h to remove the organic matter on the surface of the aluminum powder;

[0030] Separation step: put the composite solid propellant after the acid treatment step in the separation liquid, the separation liquid is prepared by reacting sodium hydroxide and ethylene glycol, the concentration is 0.3M, and the heating temperature is 80 ℃, The heating time is 0.5h, the aluminum powder will sink to the bottom of the container, the polymer matrix will become hard and brittle, easily broken, and float on the upper layer of the separation liquid. Th...

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Abstract

The invention discloses a method for reclaiming aluminum powder from a composite propellant, and belongs to the field of manufacturing of composite solid propellants. The reclaiming method comprises the following steps of: removing water in an organic solvent soaking or heating mode, removing organic substances on the surface of the aluminum powder by using a nitric acid solution, and separating the matrix from the aluminum powder by using a sodium alcoholate solution. According to the step-by-step solvent method, the adhesive matrix-polyurethane of a composite solid propellant in which the ammonium perchlorate is reclaimed is degraded, and the matrix and the aluminum powder are separated, so that the aluminum powder is successfully separated and reclaimed and the recovery rate is high and can reach over 99.5 percent; and the method is easy to implement, high in recovery rate and easy in flow process, and has good industrialized prospect.

Description

technical field [0001] The invention belongs to the field of composite solid propellant manufacturing, in particular to a method for recovering aluminum powder from composite solid propellant. Background technique [0002] The composite solid propellant is a polyurethane material with components such as aluminum powder, ammonium perchlorate and ferrocene derivatives in the formula. During the production process, waste products and wastes will be generated. After the qualified composite solid propellant exceeds the service period Automatic scrapping, therefore, there are a large number of scrapped composite solid propellants at home and abroad. According to reports, there are currently three types of methods for researching and disposing of waste composite solid propellants: such as incineration, blasting, and heat recovery; recycling centered on ammonium perchlorate, aluminum and other components; and designing new models with recyclable functions s material. [0003] Inci...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22B21/00
CPCY02P10/20
Inventor 武德珍刘伟吴战鹏齐胜利汪晓东崔瑞禧胡建军丁敦辉黄刘华
Owner BEIJING UNIV OF CHEM TECH
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