Method for wet purification of phosphoric acid with phosphate mother liquor back extraction and co-production of industrial grade phosphate

A technology for wet purification and phosphate master, applied in the field of phosphorus chemical industry, can solve problems such as unfavorable cost and environmental protection, large equipment investment, unfavorable cost, etc., and achieve the effects of being beneficial to process control, improving process parameters, and saving production costs.

Active Publication Date: 2016-02-10
GUIZHOU CHANHEN CHEM CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] The production of industrial-grade phosphate at home and abroad mostly uses thermal phosphoric acid as raw material, but due to the high cost and high energy consumption of thermal phosphoric acid production, under the current trend of energy saving and emission reduction in the world, wet purification phosphoric acid replaces thermal phosphoric acid It is an inevitable trend; however, the use of purified phosphoric acid in the industry to produce industrial-grade phosphate still requires concentration, desulfurization and decolorization of the produced purified phosphoric acid.
[0003] The patents for the production of wet-purified phosphoric acid in my country include: "A Method for Extracting and Purifying Wet-process Phosphoric Acid to Produce Industrial-grade Phosphoric Acid" with application number 201010212175.0. The process uses 40-58% P 2 o 5 The wet process phosphoric acid is used as raw material through decolorization, extraction, washing, back extraction, desulfurization, concentration and defluorination, and pure water is used for back extraction. Continued production of phosphate products needs to be concentrated to evaporate the water, which is not conducive to cost; (2) a large phosphoric acid storage tank needs to be established for intermediate storage, which has a risk of leakage, which is not conducive to cost and environmental protection; (3) the purification of the produced Phosphoric acid also needs to be concentrated, desulfurized, etc., the process is long, and the investment in equipment is large, which is not conducive to control

Method used

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  • Method for wet purification of phosphoric acid with phosphate mother liquor back extraction and co-production of industrial grade phosphate
  • Method for wet purification of phosphoric acid with phosphate mother liquor back extraction and co-production of industrial grade phosphate
  • Method for wet purification of phosphoric acid with phosphate mother liquor back extraction and co-production of industrial grade phosphate

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0044] 12ktP of Sichuan Chuanheng Chemical Co., Ltd. 2 o 5 / a Industrial-grade wet purification phosphoric acid co-production fine salt plant wet purification phosphoric acid 290t (material), the indicators are as follows in Table 1:

[0045] Table 1

[0046]

[0047] The steps for producing industrial-grade potassium dihydrogen phosphate are: defluorination and decolorization, extraction, desulfurization and washing, back-extraction of mother liquor, fine adjustment of slurry, cooling crystallization, centrifugation, drying and packaging.

[0048] (1) Defluorination and decolorization: After the phosphoric acid from the wet system enters the high-temperature concentration system for concentrated defluorination, it is measured at 5m 3 The flow rate of / h is added to the decolorization reaction tank, and 5.8t of wood powder activated carbon is added at a rate of 166kg / h (2% of the weight of phosphoric acid), and at the same time, 5.7t of defluorinating agent is added at a r...

Embodiment 2

[0058] 12ktP of Sichuan Chuanheng Chemical Co., Ltd. 2 o 5 / a Industrial-grade wet-purified phosphoric acid co-production fine salt plant raw material wet-purified phosphoric acid 132t (material), the indicators are as follows in Table 3:

[0059] table 3

[0060]

[0061] The steps for producing industrial-grade potassium dihydrogen phosphate are: defluorination and decolorization, extraction, desulfurization and washing, back-extraction of mother liquor, fine adjustment of slurry, cooling crystallization, centrifugation, drying and packaging.

[0062] (1) Defluorination and decolorization: After the phosphoric acid from the wet system enters the high-temperature concentration system for concentrated defluorination, it is measured at 5m 3 The flow rate of / h is added to the decolorization reaction tank, and 2.64t of wood powder activated carbon is added at an amount of 166kg / h (2% of the weight of phosphoric acid), and at the same time, 2.47t of defluorinating agent is a...

Embodiment 3

[0072] 12ktP of Sichuan Chuanheng Chemical Co., Ltd. 2 o 5 / a Industrial-grade wet-purified phosphoric acid co-production of fine salt plant raw material wet-purified phosphoric acid 215.5t (material), the indicators are as follows in Table 5:

[0073] table 5

[0074]

[0075] The steps of producing industrial-grade monoammonium phosphate are: defluorination and decolorization, extraction, desulfurization and washing, back-extraction of mother liquor, fine adjustment of slurry, cooling crystallization, centrifugation, drying and packaging.

[0076] (1) Defluorination and decolorization: After the phosphoric acid from the wet system enters the high-temperature concentration system for concentrated defluorination, it is measured at 5m 3 The flow rate of / h is added to the decolorization reaction tank, 4.31t of wood powder activated carbon is added at a rate of 163kg / h (2% of the weight of phosphoric acid), and at the same time, 4.23t of defluorinating agent is added at a r...

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Abstract

The invention discloses a method for reversely extracting and co-production of industrial-grade phosphate by using phosphate mother liquor for wet-method purification phosphoric acid, which is capable of lowering the production cost. The method comprises the following steps of a, adding a defluorination agent, an adsorbent and oxidizing agent in wet-method purification phosphoric acid for defluorination and decolorization; b, extracting phosphoric acid with an extraction agent, adding inorganic acid in the middle of an extraction tower; c, desulfurating and washing; d, reversely extracting with industrial-grade phosphate mother liquor; e, finely tuning slurry; f, feeding the finely tuned phosphate slurry into a crystallizer for crystallizing, then carrying out solid-liquid separation and drying to obtain product industrial-grade phosphate, wherein the slurry obtained from solid-liquid separation is industrial-grade phosphate mother liquor which is subjected to pH value adjustment and returned to step d for use. Reverse extraction is carried out by cooled and crystallized industrial-grade phosphate mother liquor, the reverse extraction effect is good, the step of evaporation is avoided, desulphurization and washing are carried out simultaneously, the procedures are simplified, and the production cost is saved. A new preparation method of the industrial-grade phosphate is provided.

Description

technical field [0001] The invention belongs to the field of phosphorus chemical industry, and in particular relates to a method for back-extracting and co-producing industrial-grade phosphate with phosphate mother liquor for wet purification of phosphoric acid, which can reduce production cost. Background technique [0002] The production of industrial-grade phosphate at home and abroad mostly uses thermal phosphoric acid as raw material, but due to the high cost and high energy consumption of thermal phosphoric acid production, under the current trend of energy saving and emission reduction in the world, wet purification phosphoric acid replaces thermal phosphoric acid It is an inevitable trend; however, the use of purified phosphoric acid in the industry to produce industrial-grade phosphate still requires concentration, desulfurization and decolorization of the produced purified phosphoric acid. [0003] The patents for the production of wet-purified phosphoric acid in m...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01B25/26
Inventor 李进王佳才邹建吴生平黄恒彭军张兴荣黄强
Owner GUIZHOU CHANHEN CHEM CO LTD
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