Method for producing high-quality industrial diammonium phosphate by composite salt purification wet-process phosphoric acid

An industrial diammonium phosphate and wet-process phosphoric acid technology, which is applied in the direction of phosphate, phosphorus oxyacid, etc., can solve the problems affecting the quality of diammonium phosphate products, the waste gas cannot be effectively used, and the product quality is unstable, so as to achieve the effect of impurity removal Significant, reduced impurity removal effect, less impurity effect

Active Publication Date: 2018-04-24
菏泽金正大生态工程有限公司 +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0009] The technical problems to be solved by the present invention mainly include: in the production process flow of industrial diammonium phosphate prepared by wet-process phosphoric acid, due to the high content of fluorine, silicon, calcium, iron, magnesium and aluminum impurities in wet-process phosphoric acid, it is difficult to All removal will seriously affect the quality of diammonium phosphate products, and the waste gas in the production process cannot be effectively used, high energy consumption, high cost, large pollution, unstable product quality, etc.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0048] A method for compound salt purification of wet-process phosphoric acid to produce high-quality industrial diammonium phosphate, comprising the steps of:

[0049] (1) Take 1000 kg of undesulfurized wet-process phosphoric acid and pump it into the neutralization tank, slowly feed ammonia gas to neutralize to pH=5.16, and collect the exhaust gas such as ammonia and fluorine overflowed by neutralization into the recovery device;

[0050] (2) Step (1) ammonium phosphate slurry is pumped into the reaction tank, and 30 kilograms of ammonium fluoride aqueous solution (mass fraction is 12.21%) and 5 kilograms of metal salts (wherein, 3.5 kilograms of potassium hydroxide, Potassium carbonate (1.5 kg), stirred and reacted at 75°C for 0.5h, and aged at 75°C for 1h.

[0051] The reaction slurry was subjected to solid-liquid separation to obtain 804.01 kg of filtrate and 234.36 kg of wet filter residue.

[0052] The filtrate analysis result that obtains is as follows, is mass percen...

Embodiment 2

[0065] A method for compound salt purification of wet-process phosphoric acid to produce high-quality industrial diammonium phosphate, comprising the steps of:

[0066] (1) Pump 214 kilograms of the crystallization liquid of Example 1 and 1000 kilograms of non-desulfurized wet-process phosphoric acid into the neutralization tank and mix them, then slowly pass ammonia gas to neutralize to pH4.45, and neutralize the overflowing ammonia, fluorine and other tail gases at the same time collected in a recycling facility;

[0067] (2) Pump the ammonium phosphate slurry in step (1) into the reaction tank, add 24.28 kilograms of ammonium fluoride aqueous solution and 12.14 kilograms of metal salt (8.14 kilograms of potassium hydroxide, 5 kilograms of potassium carbonate) to the neutralization slurry, Reaction at low temperature for 0.5h, and aging at 70°C for 1.5h; wherein, the ammonium fluoride aqueous solution is the ammonium fluoride aqueous solution obtained after absorbing tail ga...

Embodiment 3

[0081] A method for compound salt purification of wet-process phosphoric acid to produce high-quality industrial diammonium phosphate, comprising the steps of:

[0082] (1) 336 kilograms of crystallization liquids of Example 2 and 1000 kilograms of wet-process phosphoric acid are pumped into the neutralization tank and mixed, and then neutralized to pH5.25 by slowly flowing ammonia gas, and the tail gases such as ammonia and fluorine overflowed by neutralization are collected in the neutralization tank simultaneously. in the recovery unit;

[0083] (2) Pump the ammonium phosphate slurry in step (1) into the reaction tank, add 40.08 kg of ammonium fluoride aqueous solution and 10.68 kg of metal salt (7.18 kg of potassium hydroxide, 3.5 kg of potassium carbonate) to the neutralizing slurry at 80°C The reaction was stirred for 1 hour, and aged at 80°C for 1.5 hours. Wherein, the ammonium fluoride aqueous solution is the ammonium fluoride aqueous solution recovered in Example 2 (...

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PUM

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Abstract

The invention relates to a method for producing high-quality industrial diammonium phosphate by composite salt purification wet-process phosphoric acid. The method includes the steps: ammonifying andneutralizing the wet-process phosphoric acid to prepare ammonium phosphate slurry; pumping the ammonium phosphate slurry into a reaction tank, adding composite salt, performing reaction, heat preservation, aging and solid-liquid separation; concentrating obtained ammonium phosphate solution and then ammonifying and neutralizing the ammonium phosphate solution again to prepare diammonium phosphateslurry; crystallizing and separating the slurry. According to the method, impurities in the wet-process phosphoric acid are thoroughly removed, and the high-quality industrial diammonium phosphate canbe produced in a high-yield manner under the conditions of low cost and low energy consumption.

Description

technical field [0001] The invention relates to a method for producing high-quality industrial diammonium phosphate by purifying wet-process phosphoric acid with compound salt, and belongs to the technical field of chemical production. Background technique [0002] Industrial diammonium phosphate (DAP, also known as diammonium hydrogen phosphate) is mainly used as a flame retardant for heat insulation materials. It is widely used in the flame retardant of wood, paper, and fabrics. and so on. In addition, it is used as a leavening agent, dough conditioner, yeast feed, brewing fermentation aid and ruminant feed additive in the food industry, as well as in the pharmaceutical and printing industries. At the same time, it is also an instant and efficient compound drip irrigation fertilizer. It is also used as a high-grade fertilizer, and it is a high-quality basic raw material for preparing high-end fertilizers such as liquid fertilizer, foliar fertilizer, and water-soluble fer...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B25/28
CPCC01B25/28C01P2006/80
Inventor 王娜陈宏坤张敏刘阳李兴平神兴明
Owner 菏泽金正大生态工程有限公司
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