CN103964407A - Ammonium phosphate special for ABC dry powder fire-extinguishing agent and production method of ammonium phosphate - Google Patents

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

The special-purpose ammonium phosphate salt of ABC powder extinguishing agent and production method thereof

Technical field

The present invention relates to phosphoric acid salt, particularly phosphoric acid salt and production method thereof for powder extinguishing agent.

Background technology

Monoammonium phosphate is the main raw material of ABC powder extinguishing agent.The applicant was since manufacture level monoammonium phosphate in 1994.Within 2003, start production ABC powder extinguishing agent, when at a time when country implement halon phaseout program, ABC powder extinguishing agent name is at that time called " ammonium phosphate salt " powder extinguishing agent, its main raw material is all used industrial grade monoammonium phosphate or agricultural level monoammonium phosphate.Through observation analysis in using for a long time, find that this two kind of ammonium is as the main raw material of ABC dry powder defectiveness all.Impurity as own in agriculture monoammonium phosphate is various, and water-soluble phosphorus is low, only accounts for 79% left and right of available phosphorus; NH ₄h ₂pO ₄content low; And water content is up to 3-5%, rate of moisture absorption is substantially in 5% left and right, thereby having a strong impact on the quality of fire-fighting powder.Ministry of Public Security's fire product conformity assessment center in 2012 declares off after the regulation of determining ammonium biphosphate content " it is poor to pay " 3% of ABC dry powder, and agriculture monoammonium phosphate all cannot be used because determining ammonium biphosphate content is low.And industrial monoammonium phosphate is fine for ABC powder extinguishing agent, but expensive, there is the shortcoming that portioned product free acid content is high simultaneously, and because it has removed the necessary sulfate radical of dry powder etc. aborning, cause dry powder production cost significantly to raise (approximately high 1000 yuan of left and right per ton), very large to the Influence of production of powder extinguishing agent.In deep study and analysis after the internal relation between the technical indicator of first two monoammonium phosphate and the quality and technical index of ABC powder extinguishing agent, we determine to research and develop a kind of completely different with agricultural level one ammonium from technical grade one ammonium and and the special-purpose ammonium phosphate salt that mates completely of ABC powder extinguishing agent quality and technical index.Be successfully completed at present the flow processs such as lab scale, pilot scale and large-scale production, more than ten thousand tons of products of production, are used in quality and all obtain in price consistent sure and favorable comment through tens powder extinguishing agent manufacturers.

Summary of the invention

The object of the invention is to the deficiency for first two monoammonium phosphate technical scheme, develop a kind of steady quality and match with powder extinguishing agent quality and technical index, the special-purpose ammonium phosphate salt of cheap ABC powder extinguishing agent.

Technical scheme of the present invention is: the special-purpose ammonium phosphate salt of a kind of ABC powder extinguishing agent, it is characterized in that, and its quality standard is:

A method of producing the special-purpose ammonium phosphate salt of ABC powder extinguishing agent, in turn includes the following steps:

After A, Rock Phosphate (72Min BPL) fragmentation, add water for ball milling;

B, A step gained material adds sulfuric acid extraction by the phosphoric acid by wet process that washs, filters, is concentrated to concentration 25% left and right;

C, B step gained material adds liquefied ammonia to carry out neutralization reaction, until nitrogen content reaches 9%～10%, pH value is that reaction in 4～4.2 o'clock finishes;

D, C step gained material is through concentrated, and spraying is dry, obtains the special-purpose ammonium phosphate salt of ABC powder extinguishing agent.

In the present invention: NH ₄h ₂pO ₄content 80%～90% adjustable, completely consistent with 50+25 (primary ammonium phosphate+ammonium sulfate) ABC powder extinguishing agent formula, therefore there will not be the unmatched problem of filling a prescription; Water ratio≤0.5% has also met the requirement that powder extinguishing agent is produced substantially; Rate of moisture absorption is less than 3% and also follows the technical indicator of dry powder consistent; Loose density is greater than 0.7 and also matches with the close rate 0.8～0.9 of dry powder pine; Because also will add the addition material that a part of proportion is larger in process of production, as talcum powder, silica flour etc., just in time consistent with the loose density of dry powder; PH value 4～4.2 can effectively have been avoided exist (the generally acknowledging in industry that free acid content is more low better) of free acid, is conducive to pulverizing and the oven dry of dry powder raw material, and avoids (NH ₄) ₂hPO ₄enter; Mg content is no more than the 2% low rate of moisture absorption that has guaranteed dry powder, makes dry powder not absorb water, not lump; Ammonium sulfate reaches 6%～8%, has reduced the add-on of the ammonium sulfate of producing dry powder needs, has reduced dry powder production cost; Nitrogen content is 9%～10% left and right, has avoided (NH ₄) ₂hPO ₄enter, be conducive to dry powder repellency can raising and the reduction of rate of moisture absorption, guaranteed that the long-term storage of dry powder is not lumpd; Iron level is no more than 0.03%, and mica powder adds the electrical insulation capability that has guaranteed powder extinguishing agent in addition; Granularity reaches 60 order～80 orders, has reduced pulverizing difficulty and grinding time that dry powder is produced.Therefore, the various indexs of special-purpose ammonium phosphate salt all match with ABC powder extinguishing agent quality index, have important difference with other monoammonium phosphate.

Accompanying drawing explanation

Figure of description is the process flow sheet of production method of the present invention.

Embodiment

The special-purpose ammonium phosphate salt of ABC powder extinguishing agent, is characterized in that, its quality standard is:

A method of producing the special-purpose ammonium phosphate salt of ABC powder extinguishing agent, in turn includes the following steps:

After E, Rock Phosphate (72Min BPL) fragmentation, add water for ball milling;

F, A step gained material adds sulfuric acid extraction by the phosphoric acid by wet process that washs, filters, is concentrated to concentration 25% left and right;

G, B step gained material adds liquefied ammonia to carry out neutralization reaction, until nitrogen content reaches 9%～10%, pH value is that reaction in 4～4.2 o'clock finishes;

H, C step gained material is through concentrated, and spraying is dry, obtains the special-purpose ammonium phosphate salt of ABC powder extinguishing agent.

The percentage ratio relating in the present invention, if without the weight percentage that is of refering in particular to.The sulfuric acid that B step adds is better with 98% the vitriol oil.

The major traits contrast table of product of the present invention and an existing industrial ammonium, an agriculture ammonium, ABC powder extinguishing agent

The comprehensive technical indicator of analyzing the special-purpose ammonium phosphate salt of above-mentioned fire-fighting, can find it obviously and other general monoammonium phosphate be essentially different, therefore, the ABC powder extinguishing agent all technical that uses it to produce can be realized smoothly, the quality of powder extinguishing agent is improved greatly, and then improved dry-chemical fire extinguishing effect.And due to the control of moisture and granularity, the deliberately retention of ammonium sulfate, stopped the phenomenon of doing over again in production process, and make dry powder production power saving, economize coal, shortened the production cycle, greatly reduce the comprehensive production cost of dry powder.Through the goal of the invention that reaches completely on probation.Present method has been broken the production method of traditional industry, agriculture monoammonium phosphate, is the processing method designing by the needs of powder extinguishing agent technical indicator completely, for pioneering, significant in national ABC powder extinguishing agent raw material production industry.

Claims (3)

1. the special-purpose ammonium phosphate salt of ABC powder extinguishing agent, is characterized in that, its quality standard is:

2. a method of producing the special-purpose ammonium phosphate salt of ABC powder extinguishing agent as claimed in claim 1, in turn includes the following steps:

After A, Rock Phosphate (72Min BPL) fragmentation, add water for ball milling;

B, A step gained material add sulfuric acid extraction by washing, filter, the phosphoric acid by wet process of concentrated concentration 25%;

C, B step gained material adds liquefied ammonia to carry out neutralization reaction, until nitrogen content reaches 9%～10%, pH value is that reaction in 4～4.2 o'clock finishes;

D, C step gained material is through concentrated, and spraying is dry, obtains the special-purpose ammonium phosphate salt of ABC powder extinguishing agent.

3. the method for the special-purpose ammonium phosphate salt of production ABC powder extinguishing agent according to claim 2, is characterized in that, the described sulfuric acid of B step is the vitriol oil.