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Wet method phosphoric acid purification method

A wet-process phosphoric acid and phosphoric acid technology, applied in chemical instruments and methods, phosphorus compounds, inorganic chemistry, etc., can solve the problems of high specific gravity and viscosity, difficult phase separation, difficult to remove, etc., to reduce dosage, simplify processes, and reduce filtration. effect of times

Active Publication Date: 2008-07-09
YUNNAN CHEM RES INST
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Each of the above extraction agents has its own advantages and disadvantages, and the requirements for the raw material phosphoric acid are also different.
For example, tributyl phosphate has a strong ability to extract phosphoric acid in a wide range of phosphoric acid concentrations, good selectivity to metal impurities, and anion impurities (SO 4 2- , F - ) removes good advantages; but its price is expensive, in Cl - , NO 3 - The presence of ions will promote its hydrolysis and cause losses. Its specific gravity and viscosity are large, and phase separation is difficult. When using it, diluents (kerosene, cyclohexane, etc.) need to be added
Another example, although cyclohexanone, methyl isobutyl ketone, and butyl acetate are cheap and easy to phase separate, they are only suitable for the occasions where high-concentration wet-process phosphoric acid is used as the extraction object, and the raw material phosphoric acid P 2 o 5 Concentration generally must be greater than 54%
Ketone solvents have a high removal rate of cationic impurities in wet-process phosphoric acid, but HF, H 2 SO 4 Difficult to remove

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] ——Preparation of industrial grade phosphoric acid

[0023] The composition of raw material wet-process phosphoric acid used is as follows (wt%):

[0024] Element

P 2 o 5

F

SO 3

Fe 2 o 3

Al 2 o 3

MgO

As

Pb

Org.

Content%

48.67

0.70

3.17

1.31

0.34

0.60

0.004

0.007

0.05

[0025] Continuous production, the process such as figure 1 As shown, it includes pretreatment, extraction, washing, stripping, solvent recovery and concentration in sequence.

[0026] (1) Pretreatment

[0027] The pretreatment is carried out in two steps. In the first step, phosphate rock powder is added as a desulfurizer, and a mixture of sodium carbonate and sodium sulfide is used to remove fluorine, arsenic and heavy metals; 4 2- 1.20 times of the stoichiometric ratio is added, and the defluorination, arsenic and heavy metal agents are added according to 1.4 time...

Embodiment 2

[0041] ——Preparation of industrial grade phosphoric acid

[0042] In this embodiment, the composition and flow process of the raw material wet-process phosphoric acid used are the same as those in Embodiment 1. The processing condition that the present embodiment adopts and purification auxiliary agent (containing extraction agent) are all identical with embodiment 1 except following items:

[0043] Desulfurizer according to SO in phosphoric acid 4 2- 1.35 times the stoichiometric ratio is added, and the defluorination, arsenic and heavy metal agents are added according to 1.6 times the stoichiometric ratio of fluorine in phosphoric acid. The consumption of activated carbon is 0.2% of the organic matter quality contained in phosphoric acid.

[0044] The technical grade phosphoric acid prepared by the present embodiment, the content of relevant components is as follows:

[0045] Element

Embodiment 3

[0047] ——Preparation of industrial grade phosphoric acid

[0048] In this embodiment, the composition and flow process of the raw material wet-process phosphoric acid used are the same as those in Embodiment 1. The processing condition that the present embodiment adopts and purification auxiliary agent (containing extraction agent) are all identical with embodiment 1 except following items:

[0049] Desulfurizer according to SO in phosphoric acid 4 2- 1.60 times the stoichiometric ratio is added, and the defluorination, arsenic and heavy metal agents are added according to 1.75 times the stoichiometric ratio of fluorine in phosphoric acid. The consumption of activated carbon is 0.8% of the organic matter quality contained in phosphoric acid.

[0050] The technical grade phosphoric acid prepared by the present embodiment, the content of relevant components is as follows:

[0051] Element

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Abstract

The invention discloses a purifying method of wet phosphate, which comprises the following steps: proceeding desulphurization, defluorination, dearsenic, heavy metal removal and decolouration predisposal for wet phosphate; adapting the composite organic solvent of ketone and phosphate to extract the predisposed wet phosphate; producing industrial phosphate through washing, reextraction, and concentration; obtaining food-grade phosphate by deep defluorination and concentration. The invention simplifies the technology and operation to reduce the manufacturing cost, which broadens the dense scale of raw phosphate.

Description

technical field [0001] The present invention relates to a method for purifying phosphoric acid. More specifically, it relates to a method for preparing industrial-grade phosphoric acid and food-grade phosphoric acid from wet-process phosphoric acid. Background technique [0002] Due to the high energy consumption of thermal phosphoric acid production, with the increasingly tight energy sources, people are more and more willing to use wet-process phosphoric acid to prepare industrial-grade and food-grade phosphoric acid, but wet-process phosphoric acid contains high impurities, which must be purified to Meet the requirements of industrial grade and food grade phosphoric acid. Regarding the purification of wet-process phosphoric acid, there are mainly chemical precipitation method, ion exchange method, phosphoric acid concentration purification method, solvent extraction method and crystallization method. At present, solvent extraction method is generally used in industry. ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01B25/234
Inventor 方晓峰王志刚倪双林陈洪来
Owner YUNNAN CHEM RES INST
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