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Method for purifying raffinate acid

A raffinate acid and treatment method technology, applied in chemical instruments and methods, inorganic chemistry, phosphorus compounds, etc., can solve problems such as non-stratification, inability to separate multiple metal ions at the same time, and difficulty in liquid separation

Active Publication Date: 2020-05-08
SICHUAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the existing research mainly focuses on the extraction and separation of magnesium ions in phosphoric acid solution through the emulsified liquid membrane method, but it cannot separate a variety of metal ions at the same time, and the formed emulsified liquid membrane system is easy to form a stable microemulsion system so that it does not delaminate, resulting in Difficulty separating the liquid after extraction

Method used

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  • Method for purifying raffinate acid
  • Method for purifying raffinate acid

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] The preparation method comprises the following process steps:

[0023] S1, filter out the solid impurities in the raffinate, rinse the impurities with deionized water with 10% by weight of the raffinate, and return the washing solution to the raffinate as the raffinate stock solution;

[0024] S2. Add CaS of 1% mass of the stock solution to the raffinate stock solution in step S1 to remove residual heavy metals and arsenic in the stock solution, filter to remove the precipitate, and take the filtrate;

[0025] S3, adding calcium carbonate with a filtrate quality of 5% to the filtrate in step S2, adjusting the pH to 2.5-3.0, filtering out the generated precipitate, and retaining the raffinate filtrate;

[0026] S4. Prepared with 2-ethylhexyl phosphate and dodecylbenzenesulfonic acid as mobile carrier, dodecylbenzenesulfonic acid as surfactant, kerosene and liquid paraffin as membrane solvent, HCl The solution is a water-in-oil emulsion of the inner water phase, and the ...

Embodiment 2

[0030] The preparation method comprises the following process steps:

[0031] S1, filter out the solid impurities in the raffinate, rinse the impurities with deionized water with 10% by weight of the raffinate, and return the washing solution to the raffinate as the raffinate stock solution;

[0032] S2. Add CaS of 2% mass of the stock solution to the raffinate stock solution in step S1 to remove residual heavy metals and arsenic in the stock solution, filter to remove the precipitate, and take the filtrate;

[0033] S3, adding calcium carbonate with a filtrate quality of 10% to the filtrate in step S2, adjusting the pH to 2.5-3.0, filtering out the generated precipitate, and retaining the raffinate filtrate;

[0034] S4. Prepared with 2-ethylhexyl phosphate and dodecylbenzenesulfonic acid as mobile carrier, dodecylbenzenesulfonic acid as surfactant, kerosene and liquid paraffin as membrane solvent, HCl The solution is a water-in-oil emulsion of the inner water phase, and the...

Embodiment 3

[0038] The preparation method comprises the following process steps:

[0039] S1, filter out the solid impurities in the raffinate, rinse the impurities with deionized water with 10% by weight of the raffinate, and return the washing solution to the raffinate as the raffinate stock solution;

[0040] S2. Add CaS of 3% mass of the stock solution to the raffinate stock solution in step S1 to remove residual heavy metals and arsenic in the stock solution, filter to remove the precipitate, and take the filtrate;

[0041] S3, adding calcium carbonate with a filtrate quality of 15% to the filtrate in step S2, adjusting the pH to 2.5-3.0, filtering out the generated precipitate, and retaining the raffinate filtrate;

[0042]S4. Prepared with 2-ethylhexyl phosphate and dodecylbenzenesulfonic acid as mobile carrier, dodecylbenzenesulfonic acid as surfactant, kerosene and liquid paraffin as membrane solvent, HCl The solution is a water-in-oil emulsion of the inner water phase, and the ...

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Abstract

The invention discloses a method for purifying raffinate acid. 2-ethylhexyl 2-ethylhexyl phosphate and dodecylbenzene sulfonic acid are selected as flowing carriers of an emulsion liquid membrane system for purification, dodecylbenzene sulfonic acid has the functions of a flowing carrier and a surfactant, 2-ethylhexyl 2-ethylhexyl phosphate and dodecylbenzene sulfonic acid are used in cooperationso that a good emulsion liquid membrane system can be formed under the condition that a small amount of dodecylbenzene sulfonic acid is used, the system can be rapidly layered after extraction is completed, and the situation that separation is difficult due to the fact that a stable microemulsion system is formed is avoided. Under the condition that 2-ethylhexyl 2-ethylhexyl phosphate and dodecylbenzene sulfonic acid are used in cooperation to serve as a flowing carrier, compared with the condition that each flowing carrier is independently used, the capacity of extracting magnesium ions isimproved to a great extent, and aluminum ions in raffinate acid can be effectively extracted, so that the magnesium ions and the aluminum ions in the raffinate acid are removed at the same time.

Description

technical field [0001] The invention relates to the field of wet-process phosphoric acid by-product treatment, in particular to a method for purifying raffinate acid. Background technique [0002] Wet-process phosphoric acid, also known as extraction phosphoric acid, is a preparation method that uses strong acid to decompose phosphate rock to produce phosphoric acid. Its preparation mainly goes through two processes of acid hydrolysis, filtration and concentration. As an intermediate product, wet-process phosphoric acid is mostly used to process various high-concentration phosphate fertilizers, such as heavy calcium, compound fertilizers and commercial phosphoric acid, etc., and a small part is used to produce various industrial phosphates, feed phosphates, detergents, etc. Compared with wet-process phosphoric acid, thermal phosphoric acid is a high-energy product that consumes a lot of energy, so people pay more attention to the purification of low-energy wet-process phosph...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B25/234C01B25/238C01B25/237
CPCC01B25/234C01B25/2375C01B25/238Y02P10/20
Inventor 罗建洪屈吉艳刘端周钰洁
Owner SICHUAN UNIV