Control method of bulk density of abc dry powder fire extinguishing agent

Abstract

The invention discloses a control method of bulk density of an ABC dry powder extinguishing agent. The control method comprises the following steps: 1) dividing ammonium dihydrogen phosphate into two groups, respectively grinding two groups of raw materials by using a build-in stagewise ultrafine grinder to control particle size distribution, wherein one group of raw material is ground to obtain a coarse ammonium dihydrogen phosphate ground material, and the other group of raw material is ground to obtain fine ammonium dihyrogen phosphate ground material; 2) controlling particle size distribution of other raw materials; 3) matching the coarse ammonium dihydrogen phosphate ground material and the fine ammonium dihydrogen phosphate ground material, adding other raw materials to obtain the ABC dry powder extinguishing agent, wherein the ABC dry powder extinguishing gent comprises the following effective components by weight percent: 25-40% of the coarse ammonium dihydrogen phosphate ground material, 40-65% of the fine ammonium dihydrogen phosphate ground material, 1-3% of mica powder, 1-3% of activated clay, 1-3% of hydrophobic white carbon black, and 0-25% of talcum powder; and 4) screening to remove particle with particle size not less than 0.250mm. Through the adoption of the control method, the bulk density of the ABC dry powder extinguishing agent can be effectively increased.

Description

technical field [0001] The invention relates to the field of ABC dry powder fire extinguishing agent with ammonium dihydrogen phosphate as the main fire extinguishing raw material, in particular to a method for controlling the bulk density of the ABC dry powder fire extinguishing agent. Background technique [0002] With the elimination of haloalkane fire extinguishing agents and the gradual restriction of the use of PFOS fluorosurfactants for foam fire extinguishing agents, ABC dry powder fire extinguishing agents are developing rapidly due to their simple production process, easy availability of raw materials, and wide range of fire extinguishing. One of the most widely used fire extinguishing agents. [0003] The national standard GB4066.2-2004 and the European standard EN615-1994 require the "particle size distribution" of ABC dry powder fire extinguishing agent to be the value announced by the manufacturer (the national standard adds a requirement for the bottom "partic...

AI Technical Summary

Problems solved by technology

In the production process of the prior art, one-time pulverization of ammonium dihydrogen phosphate is often used (that is, all raw materials of ammonium dihydrogen phosphate are pulverized by uniform parameter standards), and in order to make the particle size distribution of the product reach the national standard, usually in the pulverization step Even if the particle size distribution of ammonium dihydrogen phosphate in the chassis reaches more than 50%, although the resulting product can make the particle size distribution and bulk density meet the standard requirements, it just falls into the required range, especially the bulk density, but due to If the bulk density is not high enough, it will lead to difficulty in filling, increase the cost of the fire extinguisher cylinder, and even lead to a decline in the ability to extinguish class A, B, and C fires. At the same time, it is not conducive to the quality management of ABC dry powder fire extinguishing agents by the fire management department

Images