A kind of production method of water-soluble monoammonium phosphate

A technology of monoammonium phosphate and its production method, which is applied in the direction of ammonium orthophosphate fertilizer, alkaline orthophosphate fertilizer, phosphate, etc., and can solve the problem of low comprehensive utilization rate of phosphogypsum, low added value of comprehensive utilization, environmental pollution, etc. problems, to achieve the effect of clean processing and utilization, good economic benefits, and low overall cost

Active Publication Date: 2021-12-07
SICHUAN UNIV
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  • Abstract
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  • Claims
  • Application Information

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Problems solved by technology

The content of water-soluble phosphorus in the monoammonium phosphate product of this method is high, but the process is complicated, white manure and ammonium magnesium phosphate are produced by-products, and the phosphorus yield is low
[0008] my country's phosphate and compound fertilizer industry is mainly dominated by sulfuric acid wet process phosphoric acid, but my country's high dependence on foreign sulfur, sulfur resources are the binding resources for the production of phosphorus and compound fertilizers in my country, and the comprehensive utilization of phosphogypsum as a by-product of sulfuric acid wet process phosphoric acid The rate of phosphogypsum is not high, the added value of comprehensive utilization is not high, and a large amount of phosphogypsum is still stockpiled, causing environmental pollution. Phosphogypsum has become one of the restrictive factors affecting the development of my country's phosphate compound fertilizer industry.

Method used

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  • A kind of production method of water-soluble monoammonium phosphate
  • A kind of production method of water-soluble monoammonium phosphate

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0071] In this example, phosphate rock P 2 o 5 , CaO, MgO, Fe 2 o 3 、Al 2 o 3 , SiO 2 , F content were 27.96%, 41.30%, 1.48%, 1.94%, 1.03%, 9.93%, 2.99%, respectively, made of phosphate rock powder. The specific process is as follows:

[0072] (1) Primary acid hydrolysis: Mix phosphate rock slurry with a water content of 30% and nitric acid solution, react at 50°C for 1.5 hours to obtain a solid-liquid mixture, and obtain acid-insoluble matter and liquid phase after solid-liquid separation; among them, phosphate rock Powder is 100g, 45wt% nitric acid solution 224g; Wherein the quality of acidolysis solution is 343g, the P of acidolysis solution 2 o 5 content of 7.9%, CaO content of 11.7%;

[0073] (2) Neutralization: neutralize the liquid phase obtained in step (1) with ammonia until the solution pH=6.5; then perform solid-liquid separation to obtain liquid phase I and 65 g of solid phase I;

[0074] (3) Nutrient adjustment: the liquid phase I is mixed with an appropri...

Embodiment 2

[0080] In this example, phosphate rock P 2 o 5 , CaO, MgO, Fe 2 o 3 、Al 2 o 3 , SiO 2 , F content were 18.12%, 29.46%, 2.74%, 1.63%, 3.73%, 34.53%, 1.62%, respectively, made of phosphate rock powder. The specific process is as follows:

[0081] (1) Primary acid hydrolysis: Mix phosphate rock slurry with a water content of 20% and nitric acid solution, react at 60°C for 1 hour to obtain a solid-liquid mixture, and obtain acid-insoluble matter and liquid phase after solid-liquid separation; among them, phosphate rock powder 100g, 150g of 65wt% nitric acid solution; wherein the quality of the acid solution is 230g, the P of the acid solution 2 o 5 content of 7.8%, CaO content of 12.7%;

[0082] (2) Neutralization: neutralize the liquid phase obtained in step (1) with ammonium carbonate until the solution pH=8.0; then perform solid-liquid separation to obtain liquid phase I and 43 g of solid phase I;

[0083] (3) Nutrient adjustment: the liquid phase I is mixed with an a...

Embodiment 3

[0089] In this example, phosphate rock P 2 o 5 , CaO, MgO, Fe 2 o 3 、Al 2 o 3 , SiO 2 , F content were 19.42%, 27.99%, 0.44%, 1.51%, 3.36%, 41.44%, 1.45%, respectively, made of phosphate rock powder. The specific process is as follows:

[0090] (1) Primary acid hydrolysis: Mix phosphate rock slurry with 25% water content and nitric acid solution, react at 70°C for 0.5h to obtain a solid-liquid mixture, and obtain acid insoluble matter and liquid phase after solid-liquid separation; wherein, the phosphate rock powder is 100g, 161g of 50wt% nitric acid solution; wherein the quality of the acid solution is 235.5g, the P of the acid solution 2 o 5 content of 8%, CaO content of 11.5%;

[0091] (2) Neutralization: neutralize the liquid phase obtained in step (1) with ammonia to a solution pH=6.8; then perform solid-liquid separation to obtain liquid phase I and 44 g of solid phase I;

[0092] (3) Nutrient adjustment: the liquid phase I is mixed with an appropriate amount o...

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Abstract

The invention relates to a production method of water-soluble monoammonium phosphate, which belongs to the technical field of clean processing and utilization of phosphate rock. A method for producing water-soluble monoammonium phosphate, comprising the following steps: a. mixing nitric acid and rock phosphate, reacting at 30-70°C for 0.5-2 hours, and separating solid and liquid to obtain an acidolysis solution; b. and until the pH is 6.5-8, solid-liquid separation, solid phase I and liquid phase I are obtained; c, solid phase I and sulfuric acid solution are mixed, 30-70 ° C for 0.3-2h, solid-liquid separation, solid phase II and Liquid phase II; neutralize the liquid phase II until the pH is 4.0-4.5, and then separate the solid and liquid to obtain solid phase III and liquid phase III; wherein, the liquid phase III is water-soluble monoammonium phosphate after processing. The method of the invention completely separates phosphorus and calcium in the phosphate rock, greatly improves the utilization rate of elements such as calcium and phosphorus, and can directly produce water-soluble monoammonium phosphate.

Description

technical field [0001] The invention relates to a production method of water-soluble monoammonium phosphate, which belongs to the technical field of clean processing and utilization of phosphate rock. Background technique [0002] Phosphate rock resources are an important strategic resource of the country and the material basis of the phosphorus chemical industry. They are non-renewable. my country is rich in phosphor rock resources, but more than 80% of them are medium and low-grade phosphate rocks that are difficult to use directly. [0003] Phosphate rock processing and utilization mainly include thermal and wet processes, of which wet processes account for the vast majority. The wet process mainly includes hydrochloric acid method, sulfuric acid method and nitric acid method. The vast majority of enterprises in my country process and produce phosphoric acid and downstream phosphate products through the sulfuric acid method. However, every ton of phosphoric acid produced...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01B25/28C05B7/00
CPCC01B25/28C01P2006/80C05B7/00
Inventor 许德华苏殊张志业杨秀山李朝荣王辛龙
Owner SICHUAN UNIV
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