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Production process of granulated mono ammonium phosphate (GMAP)

A monoammonium phosphate and production process technology, applied in ammonium orthophosphate fertilizers, phosphates, phosphorus oxyacids, etc., can solve the problems of small range of operation indicators, many indicators to be controlled, and difficulty in controlling the degree of neutralization. The effect of reducing SO3 index and impurity content

Active Publication Date: 2015-11-25
HUBEI CHUXING CHEM
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] The existing high-concentration monoammonium phosphate production process is mainly to transform the diammonium phosphate plant to produce granular monoammonium phosphate (GMAP). , its disadvantages are: from NH 3 -H 3 PO 4 -H 2 It can be seen from the properties of the saturated solution of the O system that the selection range of GMAP production process indicators is relatively narrow. It is difficult to control the degree of neutralization by using the existing tubular reactor plus drum ammoniation granulation technology, and there are many indicators to be controlled and the range of operating indicators. smaller

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0017] A kind of production technology of high-concentration monoammonium phosphate, concrete steps are:

[0018] 1) Will start with P 2 o 5 Dilute phosphoric acid with a mass concentration of 25% and P 2 o 5 Concentrated phosphoric acid with a weight concentration of 46% is desulfurized and clarified respectively, and then mixed with dilute phosphoric acid:concentrated phosphoric acid at a weight ratio of 70:30 to obtain a phosphoric acid solution;

[0019] 2) Add the phosphoric acid solution obtained in step 1) into the tubular reactor, add gas ammonia and phosphoric acid solution into the tubular reactor for acid neutralization reaction, control the neutralization degree of the slurry to 1.02-1.07, and the reaction temperature The temperature is 95-105°C, and then the obtained slurry is directly sprayed, granulated and dried to obtain a high-concentration monoammonium phosphate product.

Embodiment 2

[0021] A kind of production technology of high-concentration monoammonium phosphate, concrete steps are:

[0022] 1) Will start with P 2 o 5 Dilute phosphoric acid with a mass concentration of 23% and P 2 o 5 Concentrated phosphoric acid with a weight concentration of 47% is desulfurized and clarified respectively, and then diluted phosphoric acid:concentrated phosphoric acid is mixed according to the weight ratio of 75:25 to obtain a phosphoric acid solution;

[0023] 2) Add the phosphoric acid solution obtained in step 1) into the tubular reactor, add gas ammonia and phosphoric acid solution into the tubular reactor for acid neutralization reaction, control the neutralization degree of the slurry to 1.02-1.07, and the reaction temperature The temperature is 95-105°C, and then the obtained slurry is directly sprayed, granulated and dried to obtain a high-concentration monoammonium phosphate product.

Embodiment 3

[0025] A kind of production technology of high-concentration monoammonium phosphate, concrete steps are:

[0026] 1) Will start with P 2 o 5 Dilute phosphoric acid with a mass concentration of 24% and P 2 o 5 Concentrated phosphoric acid with a weight concentration of 46% is carried out separately, and then dilute phosphoric acid:concentrated phosphoric acid is mixed according to the weight ratio of 72:28 to obtain a phosphoric acid solution;

[0027] 2) Add the phosphoric acid solution obtained in step 1) into the tubular reactor, add gas ammonia and phosphoric acid solution into the tubular reactor for acid neutralization reaction, control the neutralization degree of the slurry to 1.02-1.07, and the reaction temperature The temperature is 95-105°C, and then the obtained slurry is directly sprayed, granulated and dried to obtain a high-concentration monoammonium phosphate product.

[0028] When the dilute phosphoric acid and concentrated phosphoric acid are desulfurized,...

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Abstract

The invention discloses a production process of high-concentration granulated mono ammonium phosphate (GMAP). The production process comprises the concrete steps of respectively desulfurizing and clarifying dilute phosphoric acid with the mass concentration of 23-25% weighted by P2O5 and concentrated phosphoric acid with the weight concentration of 46-47% weighted by P2O5, and then, mixing and blending the dilute phosphoric acid and the concentrated phosphoric acid according to the weight ratio of (70-75):(25-30) to obtain a phosphoric acid solution; next, adding the phosphoric acid solution and gas ammonia into a tubular reactor, carrying out amino acid neutralization on the gas ammonia and the phosphoric acid solution which are added into the tubular reactor, and controlling the neutralization degree of reaction slurry at 1.02-1.07 and the reaction temperature at 95-105 DEG C; and finally, directly carrying out slurry spraying granulation on the obtained slurry, and drying to obtain the high-concentration GMAP product. Through the processes of desulfurizing, clarifying and acid blending, the content of impurities in phosphoric acid is reduced, the content of nutrients in the high-concentration GMAP product is ensured, and the quality of the product is improved.

Description

technical field [0001] The invention belongs to the technical field of fertilizers, and in particular relates to a production process of high-concentration monoammonium phosphate. Background technique [0002] The existing high-concentration monoammonium phosphate production process is mainly to transform the diammonium phosphate plant to produce granular monoammonium phosphate (GMAP). , its disadvantages are: from NH 3 -H 3 PO 4 -H 2 It can be seen from the properties of the saturated solution of the O system that the selection range of GMAP production process indicators is relatively narrow. It is difficult to control the degree of neutralization by using the existing tubular reactor plus drum ammoniation granulation technology, and there are many indicators to be controlled and the range of operating indicators. smaller. Contents of the invention [0003] The purpose of the present invention is to provide a high-concentration monoammonium phosphate production p...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B25/28C05B7/00
Inventor 曹传鹏李林全邓全洲刘刚方大勇
Owner HUBEI CHUXING CHEM
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