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CN-119076584-B - Crushing method of waste solid composite propellant

CN119076584BCN 119076584 BCN119076584 BCN 119076584BCN-119076584-B

Abstract

The invention belongs to the technical field of solid composite propellant recovery, and particularly relates to a crushing method of waste solid composite propellant. Firstly, utilizing ferric trichloride hexahydrate and aluminum trichloride hexahydrate to produce composite precipitate of ferric hydroxide and aluminum hydroxide, filtering and washing the precipitate, mixing the precipitate with carbon nano tube and ethyl alcohol, ball-milling, finally calcining to obtain nano composite grinding aid, preparing the nano composite grinding aid into suspension, pulverizing the suspension and waste solid composite propellant together, and screening to obtain the pulverized solid composite propellant particles. The nano composite grinding aid prepared by the invention can improve the performance of the propellant, and the crushing method is particularly suitable for combustion recovery of waste solid composite propellant, and can obviously improve the recovery heat value and the energy utilization rate of the propellant by enhancing combustion efficiency and energy release in combustion recovery.

Inventors

  • DU HONGDE
  • HU JIANJUN
  • LIAN PENG
  • KANG CHAO
  • Zhang Mixuan
  • ZHANG YIXIN
  • ZHANG SHIZONG

Assignees

  • 苏州元合成工程科技有限公司

Dates

Publication Date
20260508
Application Date
20241030

Claims (7)

  1. 1. The crushing method of the waste solid composite propellant is characterized by comprising the following steps of: s1, uniformly mixing ferric trichloride hexahydrate, aluminum trichloride hexahydrate and water according to the mass ratio of (10-25): 5-15): 60-85, adding a proper amount of ammonia water, adjusting the pH value to 8-10, filtering and washing the generated precipitate, mixing the precipitate with carbon nano tubes and ethanol according to the mass ratio of (5-10): 1-3): 22-55, putting into a ball mill for ball milling treatment, and then drying and calcining to obtain the nano composite grinding aid; s2, uniformly mixing the nano composite grinding aid with water to form a suspension with the density of 1.3-1.9 g/cm <3 >, and adding the suspension and a solid composite propellant into a crushing device together according to the mass ratio of (25-50) (10-20) for crushing; s3, screening the crushed materials by using a screen, and separating to obtain crushed solid composite propellant particles.
  2. 2. The method of claim 1, wherein the solid composite propellant is a hydroxyl-terminated composite propellant.
  3. 3. The method for pulverizing the waste solid composite propellant according to claim 1, wherein in the step S1, the ball milling medium in the ball mill is tungsten carbide balls, the ball milling speed is 250 rpm, the ball-to-material ratio is 50:1, and the ball milling time is 10 h.
  4. 4. The method according to claim 1, wherein in the step S1, the calcination is performed under an inert gas atmosphere at 600 ℃ for 2 h.
  5. 5. The method for pulverizing the waste solid composite propellant according to claim 1, wherein in the step S2, the pulverizing device is a shear type pulverizing pump, the rotational speed of a pulverizing pump rotor is 2000-2500 r/min, the single pulverizing time is 5min, the single feeding amount is 10 kg, and the total pulverizing time is 3-5 times.
  6. 6. The method for pulverizing waste solid composite propellant according to claim 1, wherein in the step S3, the mesh size is 0.2-1 mm.
  7. 7. The method for pulverizing waste solid composite propellant according to claim 1, wherein in the step S3, the rest material after sieving is subjected to magnetic separation to separate magnetite powder, and then to centrifugal separation to obtain nano alumina powder, wherein the magnetite powder and the nano alumina powder are reused as nano composite grinding aid.

Description

Crushing method of waste solid composite propellant Technical Field The invention belongs to the technical field of solid composite propellant recovery, and particularly relates to a crushing method of waste solid composite propellant. Background The composite propellant is a fuel with high energy density and is widely applied to weaponry such as rockets, missiles and the like. However, during the production and storage processes, the solid composite propellant may be subjected to surface hardening, interfacial exfoliation, density reduction, loss of energetic components, etc. due to the influence of time, storage conditions, etc. Therefore, after 5-10 years, the aged composite solid composite propellant enters the scrapping period. The waste solid composite propellant contains components such as oxidant, fuel, adhesive and the like, which have certain damage to the environment and certain potential safety hazard, so that the waste solid composite propellant has important practical significance for recycling and recycling the effective components of the composite propellant. The primary step in recovering the composite propellant is to crush the waste solid composite propellant, and the smaller particle size can be more easily sorted and recovered and is also more easily subjected to harmless treatment, thereby reducing the pollution to the environment. The inventor's prior patent CN118684252B discloses a method for recovering waste solid composite propellant, which is to prepare slurry fluid from composite propellant and aluminum-containing powder, then burn and recover the slurry fluid, and the composite propellant is required to be crushed under the precondition in the method. The waste solid composite propellant is generally crushed by a wet method, and when the wet method is adopted, the particles of the solid composite propellant are easy to precipitate and are unfavorable for feeding, and the solid composite propellant has elasticity, and the shape of the solid composite propellant can be changed due to pressure, so that the solid composite propellant can be extruded through a relatively small aperture, but after extrusion, the material rebounds to a larger size, so that the crushing effect is poor. The grinding aid can be used for improving the grinding effect of the waste solid composite propellant, but at present, few reports on the grinding aid of the waste solid composite propellant exist. Existing grinding aids for solid waste are difficult to use in waste solid composite propellants, for example, patent EP123456789A1 discloses an iron-aluminum complex as a grinding aid in various industrial products (including cement and mineral grinding), but the crushing effect of the iron-aluminum complex in elastic materials is not ideal. Therefore, finding a method capable of effectively crushing the waste solid composite propellant is a technical problem to be solved. Disclosure of Invention In order to solve the technical problems, the invention provides a crushing method of waste solid composite propellant. The invention adopts the following technical means: a crushing method of waste solid composite propellant comprises the following steps: s1, uniformly mixing ferric trichloride hexahydrate, aluminum trichloride hexahydrate and water according to the mass ratio of (10-25): 5-15): 60-85, adding a proper amount of ammonia water, adjusting the pH value to 8-10, filtering and washing the generated precipitate, mixing the precipitate with carbon nano tubes and ethanol according to the mass ratio of (5-10): 1-3): 22-55, putting into a ball mill for ball milling treatment, and then drying and calcining to obtain the nano composite grinding aid; s2, uniformly mixing the nano composite grinding aid with water to form a suspension with the density of 1.3-1.9 g/cm <3 >, and adding the suspension and a solid composite propellant into a crushing device together according to the mass ratio of (25-50) (10-20) for crushing; s3, screening the crushed materials by using a screen, and separating to obtain crushed solid composite propellant particles. Preferably, the solid composite propellant is a hydroxyl-terminated composite propellant. Preferably, in the step S1, the ball milling medium in the ball mill is tungsten carbide balls, the ball milling rotation speed is 250 rpm, the ball-to-material ratio is 50:1, and the ball milling time is 10 h. Preferably, in the step S1, the calcination is performed under an inert gas atmosphere at 600 ℃ for 2h. Preferably, in the step S2, the crushing device is a shear type crushing pump, the rotation speed of a crushing pump rotor is 2000-2500 r/min, the single crushing time is 5min, the single feeding amount is 10kg, and the total crushing is 3-5 times. Preferably, in the step S3, the pore diameter of the screen is 0.2 to 1 mm. Preferably, in the step S3, the rest material after sieving is subjected to magnetic separation to separate magnetite powder, and then is subjected to cent