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Pre-treatment method applied to wet process phosphoric acid extraction and refining through composite extracting agents

A compound extractant and wet-process phosphoric acid technology, which is applied in chemical instruments and methods, phosphorus compounds, inorganic chemistry, etc., can solve the problems of poor purification treatment effect and increase the difficulty of subsequent processes, and achieve fast sedimentation process, complete sedimentation effect, The effect of reducing the difficulty of subsequent processes

Active Publication Date: 2013-11-20
武汉睿远昌科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to overcome the defects and problems of poor purification treatment effect and increase the difficulty of follow-up process in the prior art, and provide a wet method for extraction and purification of compound extractant with better purification treatment effect and reduced follow-up process difficulty Phosphoric acid pretreatment method

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0042] A pretreatment method applied to the extraction and refinement of wet-process phosphoric acid by a composite extractant, the pretreatment method sequentially includes the following steps:

[0043] Defluorination: Concentrate the crude phosphoric acid prepared by the wet method until P in the crude phosphoric acid 2 O 5 The mass percentage concentration is 45%, and then Na is added to the concentrated crude phosphoric acid 2 CO 3 For defluorination, the Na 2 CO 3 The added amount is calculated based on 100%-120% of the stoichiometric amount of free fluoride ion in the crude phosphoric acid after concentration;

[0044] Settling: first add a composite settling agent to the crude phosphoric acid after defluorination for settling, the volume of the composite settling agent is 1‰ of the volume of the crude phosphoric acid after defluorination, then stir evenly, and settle for 4 hours to get the clear sedimentation Acid and underflow slag acid, the volume of the sedimentation clear...

Embodiment 2

[0049] The steps are the same as in Example 1, the difference is:

[0050] Settling: The volume of the composite settling agent is 5‰ of the volume of crude phosphoric acid after defluorination, the composite settling agent is an aqueous solution with a concentration of 10% by mass, and its solute is a non-ionic surface active prepared at a mass ratio of 1:30 The nonionic surfactant is an AM-AA-DMA copolymer and a maleic acid-acrylic acid copolymer mixed in a mass ratio of 1:1, and the anionic surfactant is an oil-based polyoxygen Ethylene (10) ether phosphate;

[0051] Decolorization: The mass-volume ratio mg / ml of the activated carbon to sedimented clear acid is 1.25%:1.

Embodiment 3

[0053] The steps are the same as in Example 1, the difference is:

[0054] Settling: The volume of the composite settling agent is 10‰ of the volume of crude phosphoric acid after defluorination, the composite settling agent is an aqueous solution with a concentration of 15% by mass, and its solute is a non-ionic surface active prepared at a mass ratio of 1:50 And an anionic surfactant, the nonionic surfactant is a maleic acid-acrylic acid copolymer, and the anionic surfactant is disodium stearyl sulfosuccinamic acid;

[0055] Decolorization: The mass-volume ratio mg / ml of the activated carbon to sedimented clear acid is 1.5%:1.

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Abstract

The invention relates to a pre-treatment method applied to wet process phosphoric acid extraction and refining through composite extracting agents. The pre-treatment method sequentially comprises steps of defluorination, sedimentation and decoloration, wherein only the defluorination rate is pursued in the defluorination process, composite sedimentation agents are adopted for sedimentation in the sedimentation process, the composite sedimentation agents are water solution with the mass percentage concentration being 5 percent to 15 percent, solutes of the composite sedimentation agents are non-ionic surface active agents and anionic surface active agents prepared according to a mass ratio being 1:(10-50), powdery active carbon is adopted for decoloration in the decoloration process, and the solid content in extracted raw acid after the pre-treatment completion is lower than 0.05 weight percent. The design has the advantages that the purification effect is better, the subsequent process difficulty can be reduced, in addition, the operation process is simplified, and the desulfuration cost is reduced.

Description

Technical field [0001] The invention relates to a pretreatment method for extracting and refining wet-process phosphoric acid, in particular to a pretreatment method for extracting and refining wet-process phosphoric acid with a composite extractant, which is particularly suitable for enhancing the pretreatment effect and reducing the difficulty of subsequent production. Background technique [0002] At present, the pretreatment methods in the extraction and purification of wet-process phosphoric acid generally include defluorination, desulfurization and filtration operations. In practical applications, first carry out defluorination, desulfurization, and then filter to purify the wet-process phosphoric acid. However, since most of the phosphate rock in our country is of middle and low grade, the wet-process phosphoric acid produced from this kind of phosphate rock is concentrated In the future, the concentrated acid contains high impurity content, many solid particles, and high ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01B25/234C01B25/237
Inventor 吴杰
Owner 武汉睿远昌科技有限公司