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Method for purifying wet-process phosphoric acid by using centrifugal extractor

A centrifugal extractor, wet phosphoric acid technology, applied in separation methods, chemical instruments and methods, inorganic chemistry, etc., can solve the problems of low processing capacity, increased axial mixing, high power consumption, etc., and achieve the effect of phase separation Good, high extraction efficiency

Inactive Publication Date: 2019-04-19
CHANHEN ECO TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The processing capacity of this tower is not high, the power consumption is large, and the axial mixing is also increased compared with no pulse

Method used

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  • Method for purifying wet-process phosphoric acid by using centrifugal extractor
  • Method for purifying wet-process phosphoric acid by using centrifugal extractor
  • Method for purifying wet-process phosphoric acid by using centrifugal extractor

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0053] The pretreatment acid index is as follows:

[0054] raw material name

P 2 o 5 %

CaO%

MgO%

Fe 2 o 3 %

al 2 o 3 %

F％

SO4 2- %

proportion

pretreatment acid

39.02

0.074

1.76

0.32

0.2

0.083

3.62

1.47

[0055] 1. Extraction: Prepare a mixed solvent containing tributyl phosphate and kerosene with a specific gravity of 0.93. After the centrifugal extractor rotates to 3000r / min, the pretreated acid is sent to the heavy phase of the first-stage extraction centrifuge at a rate of 555ml / min by a metering pump. At the inlet, the mixed solvent is sent to the light phase inlet of the third-stage extraction centrifuge with a metering pump at 2220ml / min for three-stage countercurrent extraction, the extraction ratio is 4:1, the temperature is 20°C-25°C, and the raffinate is passed through the third The heavy phase outlet of the first stage is discharged; the acid-containing solvent is discharged th...

Embodiment 2

[0064] The pretreatment acid index is as follows:

[0065] raw material name

[0066] 1. Extraction: Prepare a mixed solvent containing tributyl phosphate and kerosene with a specific gravity of 0.93. After the centrifugal extractor rotates to 3000r / min, the pretreated acid is sent to the heavy phase of the first-stage extraction centrifuge at a rate of 555ml / min by a metering pump. At the inlet, the mixed solvent is sent to the light phase inlet of the third-stage extraction centrifuge with a metering pump at 2220ml / min for three-stage countercurrent extraction, the extraction ratio is 4:1, the temperature is 35°C-40°C, and the raffinate is passed through the third The heavy phase outlet of the first stage is discharged; the acid-containing solvent is discharged through the light phase outlet of the first stage extraction centrifuge, and then exchanges heat with the circulating solvent through a heat exchanger, and then enters the washing section after being heated b...

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Abstract

The invention discloses a method for purifying wet-process phosphoric acid by using a centrifugal extractor in the technical field of chemical production. The method mainly includes several phases ofpretreatment, extraction, washing, back extraction, desulphurization and condensation; and the main improving point is the extraction, washing and back extraction phases which adopt a centrifugal extractor. The centrifugal extractor can be used as extraction equipment which has low requirement for the phosphoric acid concentration of raw materials, only 30-40% is needed for the content of P2O5, requirements can be met by only performing simple treatment of ordinary semi-aqueous wet-process phosphoric acid without extra energy consumption, but the requirements in the prior art for the phosphoric acid concentration have to be controlled at 40-58%; extra control on the temperature of an extraction section is not needed, normal temperature reaction can be performed, the extraction rate of morethan 75% can be achieved when a phase ratio is 4 : 1, and compared with a rotating disc column, 6-8 : 1 has to be achieved; and through the centrifugal extractor, two phases can be fully mixed undera high-speed condition, so that high extraction efficiency and good split-phase effects can be realized, equivalent phase ratio with the rotating disc column can be achieved, and rapid split-phase andno entrainment can be realized.

Description

technical field [0001] The invention relates to the technical field of chemical production, in particular to a method for purifying wet-process phosphoric acid to produce industrial-grade and food-grade phosphoric acid. Background technique [0002] The solvent extraction process of wet phosphoric acid purification is a liquid-liquid two-phase mass transfer process. The extraction equipment must achieve high separation effect and strength, depending on the increase of mass transfer rate. The way to increase the mass transfer rate is nothing more than to fully disperse to increase the contact interface between the two phases; to increase the degree of turbulence between the two phases to increase the mass transfer coefficient; to adopt countercurrent contact and reduce back mixing to increase the mass transfer driving force. [0003] At present, there are many extraction equipment used in the industry, which can be classified into two types: fractional extraction and differen...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B25/237C01B25/234C01B25/46B01D11/04
CPCB01D11/048C01B25/234C01B25/237C01B25/2375C01B25/465
Inventor 黄恒王佳才李顺方吴生平张萍袁海斌
Owner CHANHEN ECO TECH CO LTD
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