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Method for extracting and purifying wet-process phosphorous acid to produce industrial-grade phosphorous acid

A wet-process phosphoric acid, industrial-grade technology, applied in the field of phosphoric acid, can solve the problems of unsatisfactory purification product yield and production cost, insufficient utilization of sulfur, cost reduction and environmental protection, etc., to improve element utilization rate and small footprint. , the continuous effect

Active Publication Date: 2010-10-13
GUIZHOU CHANHEN CHEM CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Its disadvantages are: (1) the extraction rate is improved by adding sulfuric acid, but a large amount of caustic soda must be used in washing; (2) the phosphorus and sulfur in the raffinate acid are not fully utilized, and are discarded or neutralized and then piled up , not conducive to cost reduction and environmental protection
These patented technologies have their own characteristics, but the yield of phosphorus, industrial grade and food grade products in the extraction process is generally only about 50%, and the yield of purified products and production cost are not ideal

Method used

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  • Method for extracting and purifying wet-process phosphorous acid to produce industrial-grade phosphorous acid

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036] 20ktP of Guizhou Chuanheng Chemical Co., Ltd. 2 o 5 / a industrial grade phosphoric acid production plant

[0037] Raw material concentrated phosphoric acid 296t (kind), the indicators are as follows:

[0038] P 2 o 5 %

SO 3 %

F％

Fe%

Ca%

Mg%

As%

Exterior

proportion

40.5

2.4

0.9

0.15

0.6

0.8

0.0024

yellow liquid phase

1.46

[0039] The steps to produce industrial-grade phosphoric acid are: primary decolorization, separation, secondary decolorization, extraction, washing, stripping, desulfurization, concentration and defluorination.

[0040] (1) Decolorization: Phosphoric acid from the wet system, the temperature is 72 ° C, measured at 5m 3 The flow rate of / h is added to the decolorization reaction tank, and 5.9t of wood powdery activated carbon is added in an amount of 146kg / h (2.0% of phosphoric acid weight), the reaction temperature is 65°C to 72°C, the stirring int...

Embodiment 2

[0050] Production device is the same as embodiment 1, raw material concentrated phosphoric acid 310t (kind), index is as follows:

[0051] P 2 o 5 %

SO 3 %

F％

Fe%

Ca%

Mg%

As%

Exterior

proportion

58

4.5

0.4

0.22

0.05

1.4

0.0020

yellow liquid phase

1.78

[0052] The production steps are: primary decolorization, separation, secondary decolorization, extraction, washing, stripping, desulfurization, concentration and defluorination.

[0053] (1) Decolorization: the wet concentrated phosphoric acid in the previous section, the temperature is 80°C, and the temperature is 5m 3 The flow rate of / h is metered into the decolorization reaction tank, and 4.7t of coal-based powdered activated carbon is added in an amount of 135kg / h (1.5% of the phosphoric acid weight), the reaction temperature is 78°C, the stirring intensity is 6m / s, and the continuous reaction residence time is 1h. The ac...

Embodiment 3

[0063] Production device is the same as embodiment 1, raw material concentrated phosphoric acid 580.7t (kind), index is as follows:

[0064] P 2 o 5 %

SO 3 %

F％

Fe%

Ca%

Mg%

As%

Exterior

proportion

52.01

4.4

0.7

0.2

0.1

1.1

0.0024

yellow liquid phase

1.64

[0065] The production steps are: primary decolorization, separation, secondary decolorization, extraction, washing, stripping, desulfurization, concentration and defluorination.

[0066] (1) Decolorization: Phosphoric acid from the wet concentration system, temperature 67°C, at 5m 3 The flow rate per hour is measured and added to the decolorization reaction tank, and 5.8t of powdered activated carbon from shells is added at an amount of 82kg / h (1.0% of the phosphoric acid weight), the reaction temperature is 62 ° C ~ 67 ° C, the stirring intensity is 4 m / s, continuous reaction 1h, use the filter pump to transport to the p...

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Abstract

The invention discloses a method for extracting and purifying wet-process phosphorous acid to produce industrial-grade phosphorous acid, which comprises the following steps: step 1, decoloration: utilizing active carbon and hydrogen peroxide to decolorize the phosphorous in two steps; step 2, extraction: utilizing extracting agent to extract phosphorous; step 3, washing: utilizing cleaning solution to washing organic phase; step 4, backextraction: utilizing pure water to extract the phosphorous acid in the organic phase; step 5, desulphurization: utilizing desulphurization agent to remove sulfate radical in the phosphorous acid; and step 6, concentration: improving the concentration of phosphorous acid, defluoridating through vacuum concentration to obtain the industrial-grade phosphorous acid. The method has the advantages that: (1) segmented decoloration is adopted, so the pretreatment process is simplified; (2) the used turntable tower is stable, the continuity is strong, and the maintenance expense is low; (3) sulfuric acid is compensated from the middle part of the extraction tower, so the yield of the industrial product is improved, the extraction rate can reach more than 95 percent, and the yield of the industrial product can reach more than 90 percent; (4) a plate-type heat exchanger is adopted, so the land occupation area is small; and (5) and the side-product barium sulfate is washed and dried to be used as an industrial product.

Description

technical field [0001] The invention relates to phosphoric acid, in particular to a method for producing industrial-grade phosphoric acid by solvent extraction and purification of wet-process phosphoric acid. Background technique [0002] As we all know, yellow phosphorus is mostly used as raw material to prepare industrial-grade phosphoric acid at home and abroad. However, the production of thermal phosphoric acid is not only costly, but also consumes a lot of energy. Under the current requirements of countries around the world to save energy and reduce carbon emissions, it is the general trend and trend to purify wet-process phosphoric acid to replace thermal phosphoric acid. [0003] The purification methods of wet process phosphoric acid mainly include chemical precipitation method, ion exchange method, solvent extraction method and crystallization method. Among the above methods, the solvent extraction method has been widely researched and adopted in Europe and the Un...

Claims

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Application Information

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IPC IPC(8): C01B25/46
Inventor 李光明李进王佳才李顺方邹建唐晓林
Owner GUIZHOU CHANHEN CHEM CO LTD
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