Adding method of flame inhibitor of coal mine permitted detonator explosive

Abstract

The invention discloses an adding method of a flame inhibitor of a coal mine permitted detonator explosive. The method comprises the following steps: 1, adding polyvinyl alcohol into water, and heating for dissolving to form an aqueous solution of polyvinyl alcohol; 2, adding the flame inhibitor into the cooled aqueous solution of polyvinyl alcohol, and fully stirring to form a suspension; and 3, putting the prepared explosive particles in the drum of a drum coating machine, allowing the drum to rotate, adding the suspension obtained in step 2 in a dropwise manner to wet the particles, introducing hot air for drying, adding the suspension, and repeating the above suspension addition and drying process until no suspension is residual, and drying to prepare a flame inhibitor-containing explosive. Compared with the prior art, the method has the following substantial characteristics: the coating rate of the flame inhibitor is high, so the cost is reduced; the content of the flame inhibitor coated in the explosive can be easily adjusted; the surface of the particles is uniformly coated with a water-soluble film, so the surface of the particles is smooth, and the fluidity of the particles is improved; crystals of the flame inhibitor coated on the surface of the particles unlikely generate a static effect, so the static accumulation of the particles is reduced; and polyvinyl alcohol is a water-soluble polymer, and water is used as a solvent, so no organic solvent volatilizes in the production process, and the method is nontoxic and has no pollution.

Description

technical field [0001] The invention belongs to a method for preparing industrial explosives, in particular to a method for adding a flame suppressant used in coal mine permissible detonator explosives. Background technique [0002] It is understood that the methods for adding the flame suppressant in the explosives for detonators allowed in coal mines mainly include direct mechanical mixing method and water suspension coating method. Though use the adding method method of these flame-extinguishing agents, can make the coal mine permit detonator explosive meet the requirement of use, but these methods all have weak points. Among them, the direct mechanical mixing method, that is, directly mechanically mixing the flame suppressant and the main insensitive explosive, has low production efficiency, complicated process, reduced service life and reliability, and it is not easy to mix the flame suppressant and explosive evenly. The water suspension coating method is relatively un...

AI Technical Summary

Problems solved by technology

Although the method of adding these flame suppressants can make the explosives used in coal mine permissible detonators meet the requirements of use, these methods all have weak points

Among them, the direct mechanical mixing method, that is, directly mechanically mixing the flame suppressant and the main insensitive explosive, this method has low production efficiency, complicated process, reduced service life and reliability, and it is not easy to mix the flame suppressant and explosive evenly.

The water suspension coating method is relatively uniform in the mixing of the flame suppressant and the explosive, but there is often a large amount of flame suppressant not coated in the explosive during the coating process, and it is difficult to increase the content of the flame suppressant to a certain extent. , especially for some ultra-fine particle flame suppressants and water-soluble flame suppressants