Special ammonium phosphate salt for abc dry powder fire extinguishing agent and production method thereof

Abstract

The invention discloses ammonium phosphate special for an ABC dry powder fire-extinguishing agent and a production method of ammonium phosphate. The production method comprises the steps of crushing phosphate ores, adding water, performing ball-milling, adding concentrated sulfuric acid for extracting, filtering by adding water, and washing to obtain wet-process phosphoric acid; then adding liquid ammonia for neutralizing until the nitrogen content reaches 9-10% and the PH value is 4-4.2; finally concentrating, and performing spray-drying to obtain ammonium phosphate, wherein the quality standards are as follows: the NH4H2PO4 content is 80-90%; the moisture content is less than or equal to 0.5%; the moisture absorption rate is less than 3%; the bulk density is more than 0.7; the pH value is 4-4.2; the magnesium content is less than or equal to 2%; the iron content is less than or equal to 0.03%; the ammonium sulfate content is 6-8%; the nitrogen content is 9-10%; the granularity (mesh number) is more than or equal to 60 meshes. The ABC dry powder fire-extinguishing agent produced by using the method can be used for improving the quality and reducing the production cost.

Description

technical field [0001] The invention relates to phosphate, in particular to phosphate for dry powder fire extinguishing agent and a production method thereof. Background technique [0002] Monoammonium phosphate is the main raw material of ABC dry powder fire extinguishing agent. The applicant started producing technical grade monoammonium phosphate in 1994. The production of ABC dry powder fire extinguishing agent started in 2003. At that time, the country implemented the halon elimination plan. The name of ABC dry powder fire extinguishing agent was "ammonium phosphate" dry powder fire extinguishing agent at that time, and its main raw materials were all industrial grade monoammonium phosphate or agricultural grade phosphoric acid. monoammonium. Through observing and analyzing in long-term use, find that these two kinds of monoammoniums all have defects as the main raw material of ABC dry powder. For example, agricultural monoammonium phosphate itself has many impuritie...

AI Technical Summary

Problems solved by technology

Industrial monoammonium phosphate can be used in ABC dry powder fire extinguishing agent, but it is expensive, and there are disadvantages of high free acid content in some products, and because it removes the sulfate radicals necessary for dry powder during production, it leads to dry powder production costs. A sharp increase (about 1,000 yuan per ton), which has a great impact on the production of dry powder fire extinguishing agents

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