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Production method of powdery fire-fighting grade monoammonium phosphate

A technology of monoammonium phosphate and a production method, applied in the field of phosphorus chemical industry, can solve the problems of difficult utilization of filter residues, large energy consumption, low utilization rate, etc., and achieve the effects of low production cost, energy saving and high specific gravity.

Active Publication Date: 2019-12-31
GUIZHOU CHANHEN CHEM CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The ammonium phosphate used as a fire extinguishing agent is mainly monoammonium phosphate, which has relatively high quality requirements for ammonium phosphate. At present, most manufacturers use thermal phosphoric acid or purified phosphoric acid to produce it, and the cost is relatively high; some manufacturers use wet-process phosphoric acid Neutralize with ammonia, filter or settle the slurry, concentrate and dry the clear liquid to produce monoammonium phosphate, or concentrate and crystallize to produce industrial grade monoammonium phosphate. Although this method can obtain monoammonium phosphate with high purity, the resulting filter residue is difficult to obtain. Utilized or used in the production of fertilizer monoammonium, P 2 o 5 The utilization rate is low, a large amount of energy is consumed in the concentration process, and the cost is high

Method used

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  • Production method of powdery fire-fighting grade monoammonium phosphate
  • Production method of powdery fire-fighting grade monoammonium phosphate
  • Production method of powdery fire-fighting grade monoammonium phosphate

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] 1) will P 2 o 5 Defluorinate 35.5% semi-aqueous wet-process phosphoric acid, filter and separate to obtain defluorinated wet-process phosphoric acid; cool the defluorinated wet-process phosphoric acid, the outlet acid temperature is 8 ° C, and age the cooled defluorinated wet-process phosphoric acid for 50 Hour;

[0028] 2) Put the aged defluorinated wet-process phosphoric acid into a neutralization tank, pass through ammonia gas for neutralization, and spray-dry the neutralized slurry at a controlled temperature of 102°C to obtain a semi-finished product of powdery fire-fighting grade monoammonium phosphate;

[0029] 3) Dry the semi-finished powdered fire-fighting grade monoammonium phosphate for the second time, and control the temperature at 85°C;

[0030] 4) Cool the secondary drying material, sieve, measure and pack, and finally obtain the finished product of powdered fire-fighting grade monoammonium phosphate. Product indicators are shown in Table 1:

[0031] ...

Embodiment 2

[0034] 1) will P 2 o 5 Defluorinate 38.7% semi-aqueous wet-process phosphoric acid, filter and separate to obtain defluorinated wet-process phosphoric acid; cool the defluorinated wet-process phosphoric acid, the acid temperature at the outlet is 12°C, and age the cooled defluorinated wet-process phosphoric acid for 28 Hour;

[0035] 2) Put the aged defluorinated wet-process phosphoric acid into a neutralization tank, pass through ammonia gas for neutralization, spray and dry the neutralized slurry, and control the temperature at 97°C to obtain a semi-finished product of powdery fire-fighting grade monoammonium phosphate;

[0036] 3) Dry the semi-finished powdered fire-fighting grade monoammonium phosphate for the second time, and control the temperature at 81°C;

[0037] 4) Cool the secondary drying material, sieve, measure and pack, and finally obtain the finished product of powdered fire-fighting grade monoammonium phosphate. Its product indicators are shown in Table 2: ...

Embodiment 3

[0041] 1) will P 2 o 5 Defluorinate and separate 41.2% semi-aqueous wet-process phosphoric acid to obtain defluorinated wet-process phosphoric acid; cool the defluorinated wet-process phosphoric acid, the acid temperature at the outlet is 17°C, and age the cooled defluorinated wet-process phosphoric acid for 40 hours ;

[0042] 2) Put the aged defluorinated wet-process phosphoric acid into a neutralization tank, pass through ammonia gas for neutralization, spray and dry the neutralization material, and control the temperature at 100°C to obtain a semi-finished product of powdery fire-fighting grade monoammonium phosphate;

[0043] 3) Dry the semi-finished powdered fire-fighting grade monoammonium phosphate for the second time, and control the temperature at 79°C;

[0044] 4) Cool the secondary drying material, sieve, measure and pack, and finally obtain the finished product of powdered fire-fighting grade monoammonium phosphate. Its product indicators are shown in Table 3. ...

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Abstract

A producing method of powdered fire-fighting grade monoammonium phosphate is disclosed. The method includes a) a step of subjecting phosphoric acid prepared by a wet process to defluorination, and then cooling and ageing the phosphoric acid; b) a step of feeding ammonia gas into a supernatant liquid after ageing for neutralization, and then performing spray drying to obtain a monoammonium phosphate semi-finished product; c) a step of drying the monoammonium phosphate semi-finished product; and d) cooling the dried product and screening the product to obtain the powdered fire-fighting grade monoammonium phosphate. The method is low in production cost. Indexes of the finished product are higher than those of powdered monoammonium phosphate products sold on the market at present. The water-soluble P2O5 content is greater than 56.2% which can be converted into a water-soluble NH4H2PO4 content of greater than 91%. The water solubility is greater than 98%, the hydroscopicity is less than 3%, and the water content is less than 1%. The method has good market competition advantages and deserves popularization and application.

Description

technical field [0001] The invention belongs to the technical field of phosphorus chemical industry, and in particular relates to a production method of powdery fire-fighting grade monoammonium phosphate. Background technique [0002] With the elimination of halon fire extinguishing agents, ammonium phosphate fire extinguishing agents are gradually recognized by humans as a substitute for halon fire extinguishing agents. Although the price of ammonium phosphate fire extinguishing agents is relatively high, their fire extinguishing efficiency is very ideal. A, B, Class C fires can be practical, which is the main leading factor in the rapid development of ammonium phosphate fire extinguishing agents in recent years. [0003] The ammonium phosphate used as a fire extinguishing agent is mainly monoammonium phosphate, which has relatively high quality requirements for ammonium phosphate. At present, most manufacturers use thermal phosphoric acid or purified phosphoric acid to pro...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01B25/28
Inventor 龙辉王佳才马永强石建华曾春华周洁林李剑秋
Owner GUIZHOU CHANHEN CHEM CO LTD
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