Method for removing organic matters inside sodium aluminate solution

A technology of sodium aluminate and organic matter, which is applied in the fields of aluminum compounds, chemical instruments and methods, aluminate/alumina/aluminum hydroxide purification, etc., and can solve the problems of alumina product particle size refinement, sodium oxide content exceeding the standard, and hydroxide Aluminum strip color and other problems, to achieve the effect of solving serious interference

Active Publication Date: 2018-05-29
GUIZHOU BRANCH CHINA ALUMINUM IND
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

It not only increases the difficulty of the key processes such as dissolution, sedimentation, decomposition and evaporation (emphasis is shown in the serious material carrying during the flash evaporation process, the difficulty of settling the diluted pulp, the serious foaming of the decomposition tank, the difficulty of cooling in the middle and the difficulty of evaporating and salt discharge, etc.), the system Increased consumption

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] Table 1 shows the chemical composition of the sodium aluminate decomposition mother liquor in the SD factory.

[0024] Table 1 Chemical composition of sodium aluminate solution g / L

[0025] Numbering

[0026] After diluting the above decomposed mother liquor by a certain number of times, mix and stir evenly with the adsorbent pseudo-boehmite at a ratio of liquid-solid ratio (mL / g) of 4, and place it at room temperature for 10 minutes. Then carry out pressure filtration (pressure 0.05Mpa~0.1Mpa) for 10min. After the separation, the filtrate and the adsorbent pseudo-boehmite are adsorbed three times under the same liquid-solid ratio (mL / g) of 4. The filtrate after adsorption three times was sampled for determination of sodium oxalate. The analysis result of sodium oxalate changed from 9.45g / L in the original method to 2.53g / L.

Embodiment 2

[0028] ZY plant sodium aluminate decomposition mother liquor, its chemical composition is shown in Table 1.

[0029] Table 1 Chemical composition of sodium aluminate solution g / L

[0030] Numbering

[0031] After diluting the above decomposed mother liquor by a certain number of times, mix and stir evenly with the adsorbent pseudo-boehmite at a ratio of liquid-solid ratio (mL / g) of 4, and place it at room temperature for 10 minutes. Then carry out pressure filtration (pressure 0.05Mpa~0.1Mpa) for 10min. After the separation, the filtrate and the adsorbent pseudo-boehmite are adsorbed three times under the same liquid-solid ratio (mL / g) of 4. The filtrate after adsorption three times was sampled for determination of sodium oxalate. The analysis result of sodium oxalate changed from 5.53g / L in the original method to 3.14g / L.

Embodiment 3

[0033] GX plant sodium aluminate decomposition mother liquor, its chemical composition is shown in Table 1.

[0034] Table 1 Chemical composition of sodium aluminate solution g / L

[0035] Numbering

[0036] After diluting the above decomposed mother liquor by a certain number of times, mix and stir evenly with the adsorbent pseudo-boehmite at a ratio of liquid-solid ratio (mL / g) of 4, and place it at room temperature for 10 minutes. Then carry out pressure filtration (pressure 0.05Mpa~0.1Mpa) for 10min. After the separation, the filtrate and the adsorbent pseudo-boehmite are adsorbed three times under the same liquid-solid ratio (mL / g) of 4. The filtrate after adsorption three times was sampled for determination of sodium oxalate. The analysis result of sodium oxalate changed from 2.68g / L in the original method to 2.52g / L.

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PUM

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Abstract

The invention discloses a method for removing organic matters inside a sodium aluminate solution, and relates to a method for removing humic acid macromolecular organic matters inside the sodium aluminate solution with an adsorption method. The method is characterized by comprising the following steps: taking pseudo-boehmite as an adsorbent, mixing the sodium aluminate solution with the pseudo-boehmite, carrying out standing adsorption, and then carrying out liquid-solid separation to obtain a post-absorption liquid without the organic matters. According to the method disclosed by the invention, the humic acid macromolecular organic matters inside the sodium aluminate solution can be removed, and a filter liquor after adsorption filtration is used for accurately analyzing the content of sodium oxalate, so that the problem that the coexisting macromolecular organic matters are seriously disturbed is solved.

Description

technical field [0001] A method for removing organic matter in sodium aluminate solution relates to a method for removing humic acid macromolecular organic matter in sodium aluminate solution by using an adsorption method. Background technique [0002] The principle of producing alumina by Bayer process is to use high α k The sodium aluminate solution dissolves the alumina in the bauxite into the solution, and undergoes a process of liquid-solid separation, seed decomposition, filtration, washing, and roasting to obtain alumina. The production process requires the oxalic acid in the sodium aluminate solution Sodium is monitored and controlled. [0003] At present, the analytical methods of sodium oxalate in sodium aluminate solution include ion chromatography, liquid chromatography, oxidation potential titration and the like. In actual operation, the results of sodium oxalate measured by ion chromatographs of different alumina companies are very different, and cannot be co...

Claims

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Application Information

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IPC IPC(8): C01F7/47
CPCC01F7/473
Inventor 路培乾娄世彬杨桂丽郑洁
Owner GUIZHOU BRANCH CHINA ALUMINUM IND
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