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Method for co-production of industrial grade ammonium dihydrogen phosphate and feed grade calcium phosphate by defluorinated phosphoric acid

A technology of high-grade ammonium dihydrogen phosphate and defluorinated phosphoric acid, which is applied in the fields of phosphate, chemical instruments and methods, phosphorus oxyacids, etc., can solve the problems of low utilization of raw materials, large losses, and unsatisfactory economic value, and achieve Good social and economic benefits, high utilization of raw materials, high nitrogen content

Active Publication Date: 2015-10-28
SINOCHEM YUNLONG +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In this method, when phosphate rock powder, sodium salt or potassium salt is added to wet-process phosphoric acid and the pH of wet-process phosphoric acid is adjusted by ammonia gas, sediment will be produced. This sediment can only enter the fertilizer system and be used as low-end agricultural fertilizer, so the economic value is not good. ideal, and due to the presence of impurities, the method P 2 o 5 The loss is relatively large, and the utilization of raw materials is not high

Method used

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  • Method for co-production of industrial grade ammonium dihydrogen phosphate and feed grade calcium phosphate by defluorinated phosphoric acid

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0063] a.P 2 o 5 In 1000g of defluorophosphoric acid with a concentration of 28.51%, 90g of calcium oxide is added in a certain proportion to carry out a neutralization reaction. Calcium oxide and P in defluorophosphoric acid 2 o 5 The molar ratio is 0.8:1, the reaction temperature is controlled at 62°C, the reaction time is 1h, and solid-liquid separation is obtained to obtain filtrate A and filter cake A; wherein, filtrate A is calcium dihydrogen phosphate solution, and filter cake A is precipitated by calcium phosphate salt .

[0064] b. Perform a secondary neutralization reaction on the filtrate A obtained in step a and ammonia water, control the reaction temperature at 67°C, and the reaction time is 1.5h. When the pH of the reaction solution is adjusted to 4.2, control the reaction to end and separate the solid and liquid to obtain the filtrate B And filter cake B, the component of filtrate B is ammonium dihydrogen phosphate solution, and filter cake B is precipitated ...

Embodiment 2

[0072] a.P 2 o 5 In 1000g of defluorophosphoric acid with a concentration of 35.53%, 140g of calcium oxide is added in a certain proportion to carry out a neutralization reaction. Calcium oxide and P in defluorophosphoric acid 2 o 5 The molar ratio is 1.0:1, the reaction temperature is controlled at 64°C, the reaction time is 1h, and solid-liquid separation is obtained to obtain filtrate A and filter cake A; wherein, filtrate A is calcium dihydrogen phosphate solution, and filter cake A is precipitated by calcium phosphate salt .

[0073]b. Perform a secondary neutralization reaction on the filtrate A obtained in step a and ammonia water, control the reaction temperature at 68°C, and the reaction time is 1.7h. When the pH of the reaction solution is adjusted to 4.4, control the reaction to end and separate the solid and liquid to obtain the filtrate B And filter cake B, the component of filtrate B is ammonium dihydrogen phosphate solution, and filter cake B is precipitated ...

Embodiment 3

[0081] a.P 2 o 5 In 1000g of defluorophosphoric acid with a concentration of 43.72%, 273g of calcium hydroxide is added in a certain proportion to carry out a neutralization reaction. Calcium hydroxide and P in defluorophosphoric acid 2 o 5 The molar ratio is 1.2:1, the reaction temperature is controlled at 64°C, the reaction time is 1h, and solid-liquid separation is obtained to obtain filtrate A and filter cake A; wherein, filtrate A is calcium dihydrogen phosphate solution, and filter cake A is precipitated by calcium phosphate salt .

[0082] b. Perform a secondary neutralization reaction on the filtrate A obtained in step a and ammonia water, control the reaction temperature at 71°C, and the reaction time is 1.9h. When the pH of the reaction solution is adjusted to 4.5, control the reaction to end and separate the solid and liquid to obtain the filtrate B And filter cake B, the component of filtrate B is ammonium dihydrogen phosphate solution, and filter cake B is prec...

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Abstract

The invention relates to a method for co-production of industrial grade ammonium dihydrogen phosphate and feed grade calcium phosphate by using defluorinated phosphoric acid, belonging to the technical field of chemical industry production. The invention aims at solving a technical problem of providing a method for co-production of industrial grade ammonium dihydrogen phosphate and feed grade calcium phosphate by using defluorinated phosphoric acid. The method comprises the following steps: neutralizing the defluorinated phosphoric acid and a primary neutralizer, performing solid-liquid separation to obtain a filtrate A and a filter cake A, neutralizing the filtrate A and a secondary neutralizer to make pH of reaction liquid reach 3.0-5.0, and performing solid-liquid separation to obtain a filtrate B and a filter cake B; concentrating, crystallizing, filtering and drying the filtrate B; or directly performing spray drying at 60-200 DEG C on the filtrate B to obtain the industrial grade ammonium dihydrogen phosphate; and drying the filter cake A and the filter cake B in combination to obtain the feed grade calcium phosphate. According to the method provided by the invention, the technology is simple, generation of waste residue is avoided, raw materials are fully used, and purity of the produced products is high, so that the method has better social benefit and economic benefit.

Description

technical field [0001] The invention relates to a method for co-producing industrial-grade ammonium dihydrogen phosphate and feed-grade calcium phosphate by defluorinated phosphoric acid, and belongs to the technical field of chemical production. Background technique [0002] Industrial grade ammonium dihydrogen phosphate is widely used as drip irrigation fertilizer in agricultural production because of its water solubility. This fertilizer can achieve water saving and efficient absorption of fertilizer effect. At the same time, the ABC dry powder fire extinguishing agent with industrial grade ammonium dihydrogen phosphate as the main component has the advantages of wide fire extinguishing range and fast speed, making it the first fire extinguishing agent in the world. At the same time, industrial grade ammonium dihydrogen phosphate is also widely used in pharmaceuticals and ruminant feed additives. Feed-grade calcium phosphate salt is widely used in the feed industry as a ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01B25/28C01B25/32
Inventor 罗显明张志业杨斌王辛龙罗蜀峰陈晓东熊柏年杨林
Owner SINOCHEM YUNLONG
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