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Aluminum sol production method and aluminum sol production system

A production method, aluminum sol technology, applied in sol preparation, chemical instruments and methods, alumina/aluminum hydroxide, etc., can solve the problems of low purity of aluminum sol, achieve low impurity content, mild conditions, and low production cost Effect

Active Publication Date: 2018-12-11
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the raw materials often contain impurities, and the purity of the prepared aluminum sol is relatively low

Method used

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  • Aluminum sol production method and aluminum sol production system
  • Aluminum sol production method and aluminum sol production system
  • Aluminum sol production method and aluminum sol production system

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0102] This embodiment adopts image 3 The production system shown, the specific operation process is as follows.

[0103] (1) Neutralization reaction

[0104] Add industrial hydrochloric acid with a concentration of 32% by weight into the neutralization reactor, and add water to dilute to a concentration of 20% by weight at ambient temperature (25° C., the same below). Then, aluminum hydroxide powder was added, and the temperature of the reactor was raised to 95° C. with stirring (stirring rate was 350 rpm), and after constant temperature for 3 hours, the temperature of the reactor was lowered to ambient temperature. The reaction solution was filtered to obtain an aluminum chloride solution having a concentration of 20% by weight. Among them, the molar ratio of aluminum hydroxide to HCl is 1:3.2.

[0105] (2) Gelling reaction

[0106] With stirring, 816 g of a 15% strength by weight aqueous solution of sodium hydroxide were slowly added to 877 g of the aluminum chloride s...

Embodiment 2

[0115] Adopt the same method as Example 1 to carry out ordinary electrodialysis, the difference is that the electrolyte content in the electrolyte in the cathode chamber of the ordinary electrodialyzer is 3% by weight, and the electrolyte content in the electrolyte in the anode chamber is Content is identical with embodiment 1. As a result, after the ordinary electrodialyzer was operated under this condition for 8 hours, the internal resistance increased, and normal electrodialysis could not be performed. It was found that the surface of the cation exchange membrane adjacent to the cathode was severely scaled, and the cation adjacent to the cathode was replaced. After the membrane is exchanged, the electrodialyzer resumes normal operation.

Embodiment 3

[0117] Ordinary electrodialysis was carried out in the same manner as in Example 1, except that the electrolyte content in the electrolyte in the cathode chamber and anode chamber of the ordinary electrodialyzer was 3% by weight. As a result, the efficiency of ordinary electrodialysis decreased after 8 hours of operation under this condition. It was found that the surface of the cation exchange membrane adjacent to the cathode was scaled after shutdown for maintenance. After replacing the cation exchange membrane adjacent to the cathode, the electrodialyzer resumed normal operation. .

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Abstract

The invention discloses an aluminum sol production method and an aluminum sol production system. The an aluminum sol production method comprises: (1) making an aluminum source contact an acid to obtain a solution containing an aluminum salt; (2) making the solution containing the aluminum salt contact an alkali to obtain a salt-containing aluminum sol; (3) carrying out ordinary electrodialysis onthe salt-containing aluminum sol to obtain a desalted aluminum sol and a recovered salt; and (4) carrying out bipolar membrane electrodialysis on the recovered salt to respectively obtain a recoveredacid and a recovered alkali, wherein at least part of the recovered acid is recycled in the step (1), and at least part of the recovered alkali is recycled in the step (2). According to the present invention, with the production system and the production method, the raw materials have characteristics of low price and high utilization rate, the quality of the prepared aluminum sol is good, and thewhole production process has the mild condition, and is environmentally friendly.

Description

technical field [0001] The invention relates to an aluminum sol production method, and the invention also relates to an aluminum sol production system. Background technique [0002] Aluminum sol is a colloidal solution in which fine particles of positively charged hydrated alumina are uniformly dispersed in water. At present, aluminum sol is widely used as catalyst binder and water treatment flocculant in industry. According to different application fields, the naming methods of aluminum sol are also different. For example, when it is used in catalyst binder, it is generally called aluminum sol; when it is used in flocculant, it is called polyaluminum chloride or basic chloride Aluminum, but its general structural formula can be expressed as: [Al 2 (OH) n Cl 6-n ·xH 2 O] m (n=1-5, m>0). [0003] The properties of aluminum sol can generally be expressed by the aluminum content, and the ratio of aluminum to chlorine (that is, the ratio of aluminum to chlorine, which ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01F7/56C01F7/02B01J13/00
CPCB01J13/0047C01F7/026C01F7/56
Inventor 郑鹏飞周丽娜刘中清罗一斌
Owner CHINA PETROLEUM & CHEM CORP
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