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Compound ferric sulfate extractant

A technology for compounding extractants and extractants, which is applied to aluminum sulfate, liquid solution solvent extraction, aluminum-sulfur compounds, etc., can solve the problems of difficult filtration, low treatment efficiency, complicated operation, etc., and achieves cost saving and shortening extraction time. Effect

Active Publication Date: 2016-02-10
EAST CHINA UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The first three methods have disadvantages such as complex operation, difficulty in filtering, and low processing efficiency to varying degrees.

Method used

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  • Compound ferric sulfate extractant
  • Compound ferric sulfate extractant
  • Compound ferric sulfate extractant

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] Add 150mL of aluminum sulfate solution into a spherical separatory funnel with a capacity of 500mL, in which Al 2 o 3 108.47g / L content, Fe 2 o 3 The content is 2.71g / L, and the pH value of the solution is 1.83. Add 150mL and the composition is: 20% 2-ethylhexylphosphonic acid mono-2-ethylhexyl ester, 10% di(2-ethylhexyl) phosphoric acid, 34 trioctylamine %, TBP6%, and kerosene 30% compound extractant were fully mixed at room temperature for 15-20 minutes, and then allowed to stand and separate for 10-25 minutes. The recovery rate of aluminum in the aqueous phase was 97.11%, and the removal rate of iron was 97.58%. The organic phase is back-extracted by 1mol / L dilute sulfuric acid 1:1, and the back-extraction rate is greater than 99%.

Embodiment 2

[0034] Add 150mL of aluminum sulfate solution into a spherical separatory funnel with a capacity of 500mL, in which Al 2 o 3 108.47g / L content, Fe 2 o 3 The content is 2.71g / L, the pH value of the solution is 1.83, and 150mL is added to form: 2-ethylhexylphosphonic acid mono-2-ethylhexyl ester 15%, di(2-ethylhexyl) phosphoric acid 20%, trioctylamine 45% %, TBP4%, kerosene 16% compound extractant was fully mixed at room temperature for 15-20 minutes, and then allowed to stand for 10-25 minutes. The recovery rate of aluminum in the aqueous phase was 96.11%, and the removal rate of iron was 98.58%. The organic phase is back-extracted by 1mol / L dilute sulfuric acid 1:1, and the back-extraction rate is greater than 99%.

Embodiment 3

[0036] Add 150mL of aluminum sulfate solution into a spherical separatory funnel with a capacity of 500mL, in which Al 2 o 3 112.73g / L content, Fe 2 o 3 The content is 2.98g / L, the pH value of the solution is 1.87, and 180mL is added to form: 2-ethylhexylphosphonic acid mono-2-ethylhexyl ester 30%, di(2-ethylhexyl) phosphoric acid 15%, trioctylamine 20% %, TBP2%, and kerosene 33% compound extractant were fully mixed at room temperature for 20-25 minutes, and then allowed to stand for 10-25 minutes to separate layers. The recovery rate of aluminum in the aqueous phase was 97.29%, and the removal rate of iron was 97.79%. The organic phase is back-extracted by 1mol / L dilute sulfuric acid 1:1, and the back-extraction rate is greater than 99%.

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Abstract

The invention relates to a compound ferric sulfate extractant. The main components of the extractant comprise one or more of 2-ethylhexylphosphoric acid mono-2-ethylhexyl ester, bis(2-ethylhexyl)phosphate, trioctylamine, and TBP, and the diluent is kerosene. The technical problem of separating ferric sulfate from aluminum sulfate is effectively solved. The extractant has the advantages that a modifier namely TBP is used in the extraction system, the problems of extractant emulsification and phase separation in extraction are effectively solved, the extraction time is shortened, the cost is saved; only through a primary treatment, the extraction rate and reverse extraction rate can exceed 97%, the processed aluminum sulfate can be used as a raw material to produce metallurgy level alumina; the extractant can be used repeatedly, the flow is simple, the process is environment-friendly, the separation effect is good, the production efficiency is high, the cost is low, and the extractant can be applied to industry easily.

Description

【Technical field】 [0001] The invention relates to the technical field of ferric sulfate extraction, in particular to a compound ferric sulfate extractant. 【Background technique】 [0002] Aluminum sulfate is an important chemical raw material, which can be used in water treatment, papermaking, alum manufacturing, petroleum decolorization, etc. The level of iron content in industrial aluminum sulfate directly affects product quality. With the development of papermaking, food, catalysis and other industries, the demand for low-iron aluminum sulfate or iron-free aluminum sulfate is increasing, so it is of great significance to study the removal of iron from iron-containing aluminum sulfate. [0003] In recent years, there have been many studies on removing iron from aluminum sulfate. The main methods include recrystallization, precipitation, alcohol washing and solvent extraction, such as U.S. Patent US4039615, Chinese Patent Publication No. CN1559906A, Chinese Patent Publicati...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01F7/74B01D11/04
Inventor 孙玉柱孙晓雪于建国乔秀臣
Owner EAST CHINA UNIV OF SCI & TECH
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