Method of using composite extracting agent for extraction and refining of phosphoric acid prepared through wet process

A composite extraction agent, wet phosphoric acid technology, applied in chemical instruments and methods, phosphorus compounds, inorganic chemistry, etc., can solve the problems of high extraction ortho acid, poor extraction effect, high production cost, low production cost and simplified operation. , requires less effect

Active Publication Date: 2012-08-01
吴杰
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to overcome the defects and problems existing in the prior art that have higher requirements for extracting raw acid, poor extraction effect and high production cost, and provide a kind of A method for extracting and refining wet-process phosphoric acid with a compound extractant with better production cost and lower production cost

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  • Method of using composite extracting agent for extraction and refining of phosphoric acid prepared through wet process
  • Method of using composite extracting agent for extraction and refining of phosphoric acid prepared through wet process

Examples

Experimental program
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Embodiment 1

[0061] A method for extracting and refining wet-process phosphoric acid with a compound extractant, the method comprises the following processes in sequence:

[0062] Pretreatment process: first concentrate the crude phosphoric acid obtained by the wet method until the P in the crude phosphoric acid 2 o 5 The mass percentage concentration is 45%, and Na is added to the crude phosphoric acid after concentration 2 CO 3 For defluorination, the Na 2 CO 3 The amount of the added amount is calculated according to 100%–120% of the free fluoride ion stoichiometry in the concentrated crude phosphoric acid, and then the compound sedimentation agent is added to the crude phosphoric acid after defluorination for sedimentation, and then stirred evenly, and the sedimentation can be obtained after 4 hours of sedimentation Cleaning acid and bottom flow slag acid, the volume of the sedimentation cleaning acid is 85%-90% of the sum of the volume of the crude phosphoric acid after defluorina...

Embodiment 2

[0070] Step is with embodiment 1, and difference is:

[0071] Extraction and refining process: Composite extractant and the above-mentioned extraction acid are used for countercurrent contact extraction at a ratio of 1:3, and the ratio of the loaded organic phase to the washing water is 20:1 for countercurrent contact washing, and the ratio of the washed organic phase to the distilled water is 25: 1. Carry out countercurrent contact stripping; the composition and weight ratio of the composite extractant are: ketone ether: alcohol: ester=65: 20: 15, the composition and weight ratio of the ketone ether are: ketone: ether =60:40;

[0072] Example 2 Extraction result: extraction rate 87%; Product quality: H 3 PO 4 Content 85.5%, sulfate ≤0.002%, fluorine 0.0007%, iron ≤0.002%, arsenic ≤0.0002%, heavy metal 0.0009%, chloride ≤0.0005%.

Embodiment 3

[0074] Step is with embodiment 1, and difference is:

[0075] Extraction and refining process: the compound extractant and the above-mentioned extraction acid are used for countercurrent contact extraction at a ratio of 1:4, the loaded organic phase and washing water are compared at a ratio of 16:1 for countercurrent contact washing, and the washing organic phase is compared with distilled water at a ratio of 15: 1. Perform countercurrent contact stripping; the composition and weight ratio of the composite extractant are: ketone ether: alcohol: ester = 80: 15: 5, the composition and weight ratio of the ketone ether are: ketone: ether =75:25;

[0076] Example 3 extraction result: extraction rate 90%; product quality: H 3 PO 4 Content 85.5%, sulfate ≤0.002%, fluorine 0.0007%, iron ≤0.002%, arsenic ≤0.0002%, heavy metal 0.0009%, chloride ≤0.0005%.

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Abstract

The invention provides a method of using a composite extracting agent for extraction and refining of phosphoric acid prepared through a wet process. The method successively comprises the procedures of pretreatment, extraction and refining and post-treatment, wherein in the procedure of pretreatment, the content of solid in extracted raw acid obtained after condensation, defluorination, sedimentation, decolouring and filtration is less than 0.05 wt%, in the procedure of extraction and refining, a composite extracting agent is used for countercurrent contact extraction and comprises ketone ether, alcohol and ester, the weight ratio of ketone ether to alcohol to ester is 60-80: 15-20: 5-15, the ketone ether comprises ketone and ether and the weight ratio of ketone to ether is 95-60: 5-40, and in the procedure of post-treatment, condensation, decolouring, desulphurization, condensation and filtration are carried out so as to obtain the product of 85% industrial phosphoric acid. The invention has the advantages of low requirements to extracted raw acid, low production cost, a good extraction effect and capability of producing more products of industrial phosphoric acid.

Description

technical field [0001] The invention relates to a method for extracting and refining wet-process phosphoric acid with an extractant, in particular to a method for extracting and refining wet-process phosphoric acid with a compound extractant, which is specifically suitable for extracting and refining the acid by using a compound extractant on the basis of reducing the requirements for the extraction of raw acid. rate increased to 85-90%. Background technique [0002] At present, there are some domestic existing technologies for extracting and refining wet-process phosphoric acid, but these existing technologies have high requirements for the original acid used in extraction. In order to meet their requirements, it is necessary to import high-grade phosphate rock to produce wet-process phosphoric acid French phosphoric acid, such as Moroccan phosphate rock, or complex pretreatment of domestic wet-process phosphoric acid mainly produced by medium and low-grade phosphate rock. ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B25/46C01B25/234
Inventor 吴杰
Owner 吴杰
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