Method for producing industrial ammonium dihydrogen phosphate

A kind of ammonium dihydrogen phosphate, production industry technology, applied in the field of chemical engineering, can solve the problems of flammability, failure to meet the requirements, short phosphoric acid purification process, etc., to achieve the effect of reducing production costs and increasing added value

Inactive Publication Date: 2012-10-03
中化化肥有限公司重庆磷复肥工程技术研究中心
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  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The Chinese patent 200710092904.1 previously applied by our company discloses a method for preparing industrial-grade phosphoric acid, food-grade phosphoric acid and industrial monoammonium phosphate with wet-process phosphoric acid, which is used to purify wet-process phosphoric acid by solvent extraction. Solvent extraction is a method for purifying wet-process phosphoric acid produced by medium and low-grade phosphate rocks. The quality of dilute acid obtained by solvent extraction is comparable to that of thermal phosphoric acid, and can directly produce industrial ammonium dihydrogen phosphate. However, this method requires the addition of organic solvents. Strong volatility, flammable, explosive, expensive, high cost for manufacturing industrial grade ammonium dihydrogen phosphate
[0004] The phosphoric acid purification process of the chemical precipitation method is short and the cost is low, but the quality of the purified acid is not high, and it cannot meet the requirements for the production of industrial ammonium dihydrogen phosphate

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035] (1) Get wet-process phosphoric acid (P 2 o 5 The content is 20.2%, SO 4 2- The content is 2.5%, H 2 SiF 6 The content is 1.3%, Fe 2+ Content is 0.25%) 70 tons, add phosphate slurry (P 2 o 5 content of 28%, water content of 30%) 4600 kg (for SO 4 2- 117% of stoichiometric, i.e. phosphate rock slurry excess 17%), the reaction left standstill for 14 hours. Take the supernatant and measure the SO in the supernatant again 4 2- Content is 1.2%, then adds 1800 kilograms of barium carbonate (being SO 4 2-- 106% of stoichiometric, i.e. barium carbonate excess 6%), 505 kilograms of sodium hydroxide (for H 2 SiF 6 100% of stoichiometry), reacted for 0.5 hours.

[0036] (2) Pour the above solution into a neutralization tank, add liquid ammonia for neutralization, and control the pH to 5.5-6.5 to obtain a neutralization slurry.

[0037] (3) filter the neutralized slurry with a plate and frame filter to obtain an ammonium phosphate solution (P 2 o 5 The content is 1...

Embodiment 2

[0040] Wet process phosphoric acid (P 2 o 5 Content is 20.0%, SO 4 2- The content is 2.7%, H 2 SiF 6 The content is 1.4%, Fe 2+ Content is 0.22%) 70 tons, add phosphate slurry (P 2 o 5 content of 28%, water content of 30%) 5137 kg (for SO 4 2- 120% of stoichiometric, i.e. 20% excess phosphate rock slurry), the reaction left standstill for 10 hours. Take the supernatant and measure the phosphoric acid SO again 4 2- Content is 1.2%, then adds 1900 kilograms of barium carbonate (for SO 4 2-- 110% of stoichiometric, i.e. barium carbonate excess 10%), 598 kilograms of sodium hydroxide (as H 2 SiF 6 110% of stoichiometric, i.e. 10% excess sodium hydroxide). React for 1 hour.

[0041] (2) Pour the above solution into a neutralization tank, feed liquid ammonia for neutralization, and control the pH to 5.5-6.5 to obtain a neutralization slurry.

[0042] (3) filter the neutralized slurry with a plate and frame filter to obtain an ammonium phosphate solution (P 2 o 5 T...

Embodiment 3

[0044] Embodiment 3: (1) get wet process phosphoric acid (P 2 o 5 The content is 20.2%, SO 4 2- The content is 2.5%, H 2 SiF 6 The content is 1.3%, Fe 2+ Content is 0.25%) 70 tons, add phosphate slurry (P 2 o 5 content of 28%, water content of 30%) 4324 kg (for SO 4 2- 110% of stoichiometric, i.e. phosphate rock slurry excess 10%), the reaction left standstill for 16 hours. Take the supernatant and measure the SO in the supernatant again 4 2- Content is 1.2%, then adds 1700 kilograms of barium carbonate (being SO 4 2-- 100% of stoichiometric), 505 kg of sodium hydroxide (as H 2 SiF 6 100% of stoichiometry), reacted for 0.6 hours.

[0045] (2) Pour the above solution into a neutralization tank, add liquid ammonia for neutralization, and control the pH to 5.5-6.5 to obtain a neutralization slurry.

[0046] (3) filter the neutralized slurry with a plate and frame filter to obtain an ammonium phosphate solution (P 2 o 5 The content is 17.13%, SO 4 2- The conten...

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Abstract

The invention discloses a method for producing industrial ammonium dihydrogen phosphate, which comprises the following steps: 1) adding a certain amount of phosphorite slurry into phosphoric acid by wet process, reacting and standing by for a period of time, and initially desulfurizing; 2) taking supernatant liquor, adding a certain amount of barium salt and sodium salt, thereby deeply desulfurizing and defluorinating; 3) introducing ammonia for neutralizing, and then filtering, thereby obtaining an ammonium acid phosphate solution containing few impurities; and 4) mixing the solution with phosphoric acid purified according to a solvent extraction method in proportion, adjusting neutralizing degree, concentrating and crystallizing, thereby obtaining the industrial ammonium dihydrogen phosphate. A chemical precipitation method is used for purifying the phosphoric acid by wet process produced by using medium / low-grade phosphorite; the purifying degree is not enough, so that the chemical precipitation method cannot be directly used for producing the industrial ammonium dihydrogen phosphate. Less solvent is added for purifying the phosphoric acid according to the solvent extraction method and then the concentrating and crystallizing are performed, thereby obtaining the ammonium dihydrogen phosphate which can reach II class standard in HG / T4133-2010. The production cost is lowered.

Description

technical field [0001] The invention belongs to the technical field of chemical engineering and relates to a production method of industrial-grade ammonium dihydrogen phosphate. Background technique [0002] The production of industrial ammonium dihydrogen phosphate has long been using thermal phosphoric acid process. However, with the changes in market demand and the constraints of resources, environment, energy and other factors, phosphoric acid and inorganic phosphate production technology based on wet-process phosphoric acid purification technology has developed rapidly instead of traditional thermal phosphoric acid and phosphate production technology. It has become a hot spot in the development of high-tech modern phosphorus chemical industry. The process route using sulfuric acid as raw material is the most basic method in the production of wet-process phosphoric acid. Wet-process phosphoric acid is essentially a mixed acid of phosphoric acid, sulfuric acid and fluosi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B25/28
Inventor 盛勇梅胜明蹇民周佩郑开元陈明凤江涛陈鹏
Owner 中化化肥有限公司重庆磷复肥工程技术研究中心
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