Production method of water-soluble monoammonium phosphate

A technology of monoammonium phosphate and production method, applied in ammonium orthophosphate fertilizer, alkaline orthophosphate fertilizer, phosphate and other directions, can solve the problem of low comprehensive utilization rate of phosphogypsum, low added value of comprehensive utilization, complicated process, etc. problems, to achieve the effect of clean processing and utilization, good economic benefits, and low process energy consumption

Active Publication Date: 2020-08-14
SICHUAN UNIV
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  • Abstract
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  • Claims
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AI Technical Summary

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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  • Production method of water-soluble monoammonium phosphate
  • 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, and belongs to the technical field of phosphorite clean processing and utilization. The method comprises the following steps: a. mixing nitric acid and phosphorite, reacting at 30-70 DEG C for 0.5-2 hours, and carrying out solid-liquid separation to obtain an acidolysis solution; b, neutralizing the acidolysis solution until the pH value is 6.5-8, and carrying out solid-liquid separation to obtain a solid phase I and a liquid phase I; c, mixing the solid phase I with a sulfuric acid solution, reacting at 30-70 DEG C for 0.3-2 hours, and performing solid-liquid separation to obtain a solid phase II and a liquid phase II; neutralizing the liquid phase II until the pH value is 4.0-4.5, and carrying out solid-liquid separation to obtain a solid phase III and a liquid phase III, wherein the liquid phase III is processed to obtain the water-soluble monoammonium phosphate. According to the method, phosphorusand calcium in phosphorite are completely separated, the utilization rate of calcium, phosphorus and other elements is greatly increased, and water-soluble monoammonium phosphate can be directly produced.

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 Applications(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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