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Method for producing potassium dihydrogen phosphate by refining by-product washing water with wet-process phosphoric acid

A technology of potassium dihydrogen phosphate and wet-process phosphoric acid, which is applied in chemical instruments and methods, phosphorus compounds, inorganic chemistry, etc., can solve the problems of high raw material cost and complicated process flow, and achieve improved recovery rate, simplified process flow, and high-efficiency The effect of using

Active Publication Date: 2018-10-26
HUAZHONG NORMAL UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to overcome the defects and problems of high raw material cost and complex process flow in the prior art, and provide a kind of low raw material cost and simple process flow to produce phosphoric acid di Hydrogen Potassium Method

Method used

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  • Method for producing potassium dihydrogen phosphate by refining by-product washing water with wet-process phosphoric acid
  • Method for producing potassium dihydrogen phosphate by refining by-product washing water with wet-process phosphoric acid
  • Method for producing potassium dihydrogen phosphate by refining by-product washing water with wet-process phosphoric acid

Examples

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Effect test

Embodiment 1

[0108] see Figure 1 to Figure 14 , a method for producing potassium dihydrogen phosphate by using wet-process phosphoric acid refining by-product wash water, comprising the following steps in turn:

[0109] Acid adjustment process: firstly mix the washing water and water evenly to obtain a mixed solution, and the P in the mixed solution 2 o 5 The mass percent concentration is 18%; the product obtained after the potassium salt washing water configured by solvent extraction refining wet-process phosphoric acid from the solvent extraction process participates in the reaction, and the raffinate includes P 2 o 5 with sulfate, P 2 o 5 The mass percentage concentration is 35%, and the content of sulfate radical is 35g / L;

[0110] Desulfurization process: first add phosphate rock powder or calcium carbonate or barium carbonate to the above mixed solution according to 85% of the stoichiometric amount of sulfate in the mixed solution for desulfurization. The desulfurization time i...

Embodiment 2

[0116] Basic content is the same as embodiment 1, the difference is:

[0117] Acid adjustment process: P in the mixture 2 o 5 The mass percentage concentration is 22%; P in the washing water 2 o 5 The mass percentage concentration is 45%, and the content of sulfate radical is 65g / L;

[0118] Desulfurization process: add phosphate rock powder or calcium carbonate or barium carbonate according to 50% of the stoichiometric amount of sulfate radicals in the mixture for desulfurization;

[0119] Mixing process: add potassium chloride according to 95% of the stoichiometric amount of phosphoric acid in the filtrate;

[0120] Decolorization and impurity removal process: the addition of activated carbon is 5‰ of the solution volume, and the addition of decolorization aid is 1‰ of the solution volume;

[0121] Atmospheric pressure concentration process: the temperature of atmospheric concentration is 140°C, and the specific gravity after atmospheric concentration is 1.35;

[0122]...

Embodiment 3

[0124] Basic content is the same as embodiment 1, the difference is:

[0125] Acid adjustment process: P in the mixture 2 o 5 The mass percentage concentration is 20%; P in the washing water 2 o 5The mass percent concentration is 40%, and the sulfate radical content is 50g / L;

[0126] Desulfurization process: add phosphate rock powder or calcium carbonate or barium carbonate according to 68% of the stoichiometric amount of sulfate radical in the mixture for desulfurization;

[0127] Mixing process: add potassium chloride according to 90% of the stoichiometric amount of phosphoric acid in the filtrate;

[0128] Decolorization and impurity removal process: the amount of activated carbon added is 2‰ of the solution volume, and the amount of decolorization aid is 3‰ of the solution volume;

[0129] Atmospheric pressure concentration process: the temperature of atmospheric concentration is 155°C, and the specific gravity after atmospheric concentration is 1.33;

[0130] Cryst...

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Abstract

The invention relates to a method for production of potassium dihydrogen phosphate with a wet process phosphoric acid refining byproduct scourage. The method consists of: firstly subjecting crystallization filter mother liquid, scourage and water to acid regulation to obtain a mixed solution, then performing desulfurization according to the stoichiometry of sulfate radical in the mixed solution, and adding potassium chloride into the desulfurized filtrate according to the stoichiometry of phosphoric acid to produce potassium dihydrogen phosphate, conducting stirring, then adding activated carbon and a decoloration assistant into the slurry to conduct decoloration and impurity removal, conducting filtering, then carrying out ordinary pressure concentration and vacuum cooling crystallization so as to obtain a crystal and a mother liquid, drying the crystal to obtain a potassium dihydrogen phosphate product, and returning the mother liquid to a next round of acid regulation process for recycling. The method provided by the invention not only realizes efficient utilization of the scourage obtained in wet process phosphoric acid refining by solvent extraction method, enhances the utilization rate of the mother liquid, saves the product cost, but also has the advantages of simple process, low raw material cost, and good economic benefits.

Description

technical field [0001] The invention relates to a production process of potassium dihydrogen phosphate, in particular to a method for producing potassium dihydrogen phosphate by-product washing water from the purification of wet-process phosphoric acid, and is particularly suitable for washing water produced when wet-process phosphoric acid is refined by solvent extraction. Potassium dihydrogen phosphate is produced from the remaining water, and the process is simple and the cost is low. Background technique [0002] There are two kinds of raw materials for the production of potassium dihydrogen phosphate, one is hot-process phosphoric acid, and the other is wet-process phosphoric acid. The method of direct neutralization of thermal phosphoric acid and strong alkali is used to produce industrial grade potassium dihydrogen phosphate. Although the purity of the product is very high, the production cost is relatively high, while the production of industrial grade potassium dihy...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01B25/30
CPCC01B25/30
Inventor 侯炎学吴杰
Owner HUAZHONG NORMAL UNIV
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