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A kind of extraction agent and extraction method of industrial phosphoric acid produced by hydrochloric acid method

An industrial phosphoric acid and hydrochloric acid method technology, applied in chemical instruments and methods, phosphorus compounds, inorganic chemistry and other directions, can solve the problems of being unfavorable to large-scale industrial production, unrealized industrial production, low extraction efficiency, etc., and achieves moderate boiling point, Recycling is convenient and the effect of saving solvent loss

Active Publication Date: 2018-01-09
HUBEI SANNING CHEM
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the extractant used in this method can preferentially extract Fe 3+ with Cl - The complexes formed, resulting in the finished Fe phosphate 3+ On the other hand, it is necessary to carry out two concentration and two extractions, and after the second concentration, the temperature must be lowered to below 10°C before the second extraction can be carried out, resulting in high energy consumption
The shortcomings of large investment, low efficiency of impurity removal, high risk, and high energy consumption are not conducive to large-scale industrial production
Chinese patent 201110006702 discloses a method of one-step hydrochloric acid extraction to produce industrial phosphoric acid from medium and low-grade phosphate rocks. This method uses hydrochloric acid to decompose phosphate rocks, firstly prepare calcium dihydrogen phosphate chloride, and then add dilute phosphoric acid for beating, and then filter and purify Finally, it is beaten and dissolved with hydrochloric acid, extracted with tributyl phosphate, concentrated, and decolorized to obtain industrial phosphoric acid. This method has problems such as low extraction efficiency and large loss in practical application, and has not been realized in industrial production so far.

Method used

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  • A kind of extraction agent and extraction method of industrial phosphoric acid produced by hydrochloric acid method
  • A kind of extraction agent and extraction method of industrial phosphoric acid produced by hydrochloric acid method
  • A kind of extraction agent and extraction method of industrial phosphoric acid produced by hydrochloric acid method

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] Add hydrochloric acid with a mass concentration of about 21% into the acid hydrolysis tank, add phosphate rock powder under stirring, and the amount of hydrochloric acid is 1.2 times the theoretical amount of hydrochloric acid required when the CaO in the phosphate rock powder is completely reacted with hydrochloric acid. The reaction was carried out at 50° C. under vigorous stirring for 2 hours, and after completion of the reaction, the solution was filtered to obtain an acid hydrolyzed solution.

[0027] Concentrate the clarified acid hydrolysate to H 3 PO 4 The mass fraction is about 20%, adding an appropriate amount of sodium carbonate for defluorination, reacting at 70 ° C for 2 hours, sedimentation, taking the supernatant liquid, adding activated carbon to decolorize, and filtering to obtain a crudely purified phosphoric acid solution.

[0028] The above-mentioned crude and purified phosphoric acid solution is added to the extraction agent of the present inventio...

Embodiment 2

[0035] Add hydrochloric acid with a mass concentration of about 21% into the acid hydrolysis tank, add phosphate rock powder under stirring, and the amount of hydrochloric acid is 1.1 times the theoretical amount of hydrochloric acid required when the CaO in the phosphate rock powder is completely reacted with hydrochloric acid. The reaction was carried out at 60° C. under vigorous stirring for 0.5 hours, and after the reaction was completed, the solution was filtered to obtain an acid hydrolyzed solution.

[0036] Concentrate the clarified acid hydrolysate to H 3 PO 4 The mass fraction is about 25%, adding an appropriate amount of sodium carbonate for defluorination, reacting at 70 ° C for 2 hours, sedimentation, taking the supernatant liquid, adding activated carbon to decolorize, and filtering to obtain a crudely purified phosphoric acid solution.

[0037] The above-mentioned crude and purified phosphoric acid solution is added to the extractant of the present invention in...

Embodiment 3

[0044] Add hydrochloric acid with a mass concentration of about 21% into the acid hydrolysis tank, add phosphate rock powder under stirring, and the amount of hydrochloric acid is 1.05 times the theoretical amount of hydrochloric acid required when the CaO in the phosphate rock powder is completely reacted with hydrochloric acid. The reaction was carried out at 50° C. under vigorous stirring for 2 hours, and after completion of the reaction, the solution was filtered to obtain an acid hydrolyzed solution.

[0045] Concentrate the clarified acid hydrolysate to H 3 PO 4 The mass fraction is about 20%, adding an appropriate amount of sodium carbonate for defluorination, reacting at 70 ° C for 2 hours, sedimentation, taking the supernatant liquid, adding activated carbon to decolorize, and filtering to obtain a crudely purified phosphoric acid solution.

[0046] The above-mentioned crude and purified phosphoric acid solution is added to the extractant of the present invention in ...

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Abstract

The invention discloses an extraction agent for preparing industrial phosphoric acid through a hydrochloric acid method and an extraction method thereof. The extraction agent comprises, by mass, 10-50% of one or two of tributyl phosphate or tributoxy ethyl phosphate, 15-40% of one or multiple of n-butyl alcohol, isooctanol, cyclohexanol, isopropanol and isoamylol, 10-30% of one or two of n-butyl ether, isopropyl ether and diisopropyl ether, 5-30% of one or multiple of high-carbon ketone, aliphatic amine or quaternary ammonium salt and 1-10% of one or multiple of oil-based polyoxyethylene ether phosphate, octyl sodium sulfate, alpha-alkenyl sodium sulfonate, sodium lignin sulfonate, stearyl sulfo succinamide disodium and lauryl ammonium sulfate. The extraction agent is wide in application condition, low in solvent loss and convenient to recycle, and extraction rate can reach higher than 80%.

Description

technical field [0001] The invention relates to the technical field of phosphoric acid preparation, in particular to a composite extractant used in the preparation of industrial phosphoric acid by a hydrochloric acid method. Background technique [0002] Phosphoric acid is an important chemical raw material, which is widely used in chemical fertilizers, food, paint, electronic industry and other industries. There are two main production processes for phosphoric acid: thermal method and wet method. Thermal phosphoric acid is obtained by oxidation and absorption of yellow phosphorus by electric furnace method. The obtained phosphoric acid has high purity, but requires high raw materials and consumes a lot of energy. Wet-process phosphoric acid decomposes phosphate rock with acid, and obtains phosphoric acid after solid-liquid separation, which has the advantages of wide adaptability and low energy consumption. The typical wet-process phosphoric acid uses sulfuric acid to dec...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01B25/46
CPCC01B25/465C01B25/462C01B25/463C01B25/464
Inventor 田承涛肖林波张小元
Owner HUBEI SANNING CHEM
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