Technique for purifying and producing industrial phosphoric acid by wet-process phosphoric acid

A wet-process phosphoric acid and industrial phosphoric acid technology, which is applied in the direction of phosphorus compounds, inorganic chemistry, chemical instruments and methods, etc., can solve the problems of increasing equipment investment and inability to effectively remove anions, and achieve energy saving, good adaptability, and good separation effect of effect

Inactive Publication Date: 2009-09-09
WUHAN INSTITUTE OF TECHNOLOGY +1
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Patent application No. 03117850.2 "Method for preparing industrial-grade phosphoric acid and food-grade phosphoric acid with wet-process phosphoric acid" is characterized in that tributyl phosphate/kerosene mixed solvent is used for extraction, the solvent does not need to be recovered separately, and the effect of removing cations is better, but Anions cannot be effectively removed, after wet phosphoric acid extraction, deep desulfurization and defluorination are

Method used

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  • Technique for purifying and producing industrial phosphoric acid by wet-process phosphoric acid
  • Technique for purifying and producing industrial phosphoric acid by wet-process phosphoric acid
  • Technique for purifying and producing industrial phosphoric acid by wet-process phosphoric acid

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] Embodiment 1: Preparation of industrial phosphoric acid by wet-process phosphoric acid

[0032] In the present embodiment, the composition of wet-process phosphoric acid is as follows (wt%):

[0033]

[0034] 1. Desulfurization and defluorination treatment

[0035] The desulfurization and defluorination treatment is carried out in the desulfurization and defluorination settling tank, and the wet-process phosphoric acid produced by the sulfuric acid method has a content of 25.68% (H 3 PO 4 , wt%), no need to concentrate, add calcium carbonate and phosphate rock powder composite desulfurization reagent according to 120% of the stoichiometric ratio of sulfate ions, wherein the mass ratio of calcium carbonate and phosphate rock powder is 6:1; Sodium carbonate is added to 100% of the stoichiometric ratio, and active silicon additives are added at the same time, and the amount of active silicon added is 0.15% of the fluoride ion stoichiometric ratio. Reaction temperatur...

Embodiment 2

[0050] Embodiment 2: Preparation of industrial phosphoric acid by wet-process phosphoric acid

[0051] In the above process steps, except for the desulfurization and defluorination treatment process, the other processes are the same as in Example 1.

[0052] The desulfurization and defluorination treatment is carried out in the desulfurization and defluorination settling tank, and the wet-process phosphoric acid produced by the sulfuric acid method has a content of 25.68% (H 3 PO 4 , wt%), no need to concentrate, add calcium oxide and phosphate rock powder composite desulfurization reagent according to 150% of the stoichiometric ratio of sulfate ions, wherein the mass ratio of calcium oxide and phosphate rock powder is 7:1; Sodium carbonate is added to 110% of the stoichiometric ratio, and aluminum hydroxide additive is added simultaneously, and the aluminum hydroxide addition is 0.10% of the fluoride ion stoichiometric ratio. Reaction temperature, 45°C, stirring speed, 200r...

Embodiment 3

[0055] Embodiment 3: wet-process phosphoric acid prepares industrial phosphoric acid

[0056] In the above process steps, except for the extraction process, all the other processes are the same as in Example 1.

[0057] The extraction is carried out in a pulse vibrating sieve plate column, and the alcohol-ester mixed organic solvent is used for countercurrent extraction. The alcohol-ester volume ratio in the mixed organic solvent is 8:2, wherein the alcohol is isoamyl alcohol, and the ester is tributyl phosphate. Ratio is organic phase: water phase=3: 1, adds extraction promotor (sulfuric acid, mass concentration is 75%) at organic phase entrance, and add-on is 0.5wt% of the wet-process phosphoric acid quality described in step 1), and extraction temperature is 60°C, pulse vibration frequency 35.

[0058] The industrial-grade phosphoric acid that present embodiment gains forms the following table (wt%):

[0059]

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Abstract

The invention relates to the technique for purifying and producing industrial phosphoric acid by wet-process phosphoric acid, which comprises the following steps of: (1) desulfurization and defluorination sedimentation-filtration process; (2) the extraction of wet-process phosphoric acid after desulfurization and defluorination process; (3) the washing of organic phase after extraction; (4) the back extraction of the organic phase after washing; (5) the refining of aqueous phase after the back extraction; (6) concentrating till containing 85wt% H3PO4 and recycling organic solvent. The technique has the beneficial effects that (1) the wet-process phosphoric acid produced by adopting the existing sulfuric acid process does need to be preconcentrated; (2) compound extracting agent of the technique has good suitability for the extraction of the wet-process phosphoric acid; (3) the compound extracting agent has better separating effect on iron ions and other heavy metal ions; (4) emulsion generated by the organic phase in the washing process can be eliminated by a warming/stewing mode; (5) the technique adopts amidine fiber adsorption column to refine wet-process phosphoric acid and can effectively absorb trace metal ions, and the clearance of the metal ions can reach 99 wt%.

Description

technical field [0001] The invention relates to a process for producing industrial phosphoric acid by purifying wet-process phosphoric acid. Background technique [0002] The purification process of wet-process phosphoric acid mainly includes chemical precipitation method, crystallization method, ion exchange method, solvent precipitation method, organic solvent extraction method, concentration purification method, and electrodialysis method. At present, organic solvent extraction method and organic solvent extraction method are generally used in industry. There are mainly the Central-Liqueur process of French Rhone-Planck Company using organic solvent extraction to purify wet-process phosphoric acid, the Phorex method of French APC company, the British Albright Wilson method, the Israeli IMI Cleaning method, and Toyo Soda process. The Dongyang Soda process performs multi-stage countercurrent extraction of phosphoric acid and n-butanol after pretreatment, but it has certain ...

Claims

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Application Information

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IPC IPC(8): C01B25/46
Inventor 丁一刚吴元欣何俊潘志权查炎华戢峻陈虎杨昌炎周玉新
Owner WUHAN INSTITUTE OF TECHNOLOGY
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