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A method for preparing an alumina sol

A technology of alumina sol and aluminum ash, applied in the directions of alumina/aluminum hydroxide, etc., can solve the problem of expensive raw materials for preparing alumina sol, and achieve the effects of reducing the preparation cost, simplifying the process, and preventing agglomeration

Active Publication Date: 2013-07-17
YANCHENG SILU INFORMATION TECH SERVICE CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The invention provides a method for preparing alumina sol from aluminum ash, which not only solves the problem of expensive raw materials for the preparation of alumina sol, but also provides a new way for harmless treatment of aluminum ash

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] A. First prepare hydrochloric acid with a concentration of 30%. According to the mass ratio of 1:8, slowly add aluminum ash to the hydrochloric acid at a rate of 2g / min, keep at 60-80°C, keep stirring for 5h, and then age for 9h , and then filtered to obtain the filtrate;

[0019] B. Stir the filtrate continuously, add ammonia water with a concentration of 8% to the filtrate, and add an additive accounting for 0.2% of the filtrate mass percentage to the filtrate, keep the temperature at 80-90°C, adjust the pH value to 8-9, and continue After stirring for 30 minutes, a stable alumina sol was obtained after aging for 12 hours. The auxiliary agent is at least one of polyvinyl alcohol, polyethylene glycol, acrylic resin, aluminum phosphate and magnesium phosphate.

Embodiment 2

[0021] A. First prepare hydrochloric acid with a concentration of 20%, and slowly add aluminum ash to the hydrochloric acid at a rate of 4g / min according to the mass ratio of 1:7, keep it at 70-80°C, keep stirring for 3 hours, and then age for 11 hours , and then filtered to obtain the filtrate;

[0022] B. Stir the filtrate continuously, add ammonia water with a concentration of 6% to the filtrate, and add an additive accounting for 0.15% of the filtrate mass percentage to the filtrate, keep the temperature at 80-90°C, adjust the pH value to 8-9, and continue After stirring for 30 minutes, a stable alumina sol was obtained after aging for 9 hours. The auxiliary agent is at least one of polyvinyl alcohol, polyethylene glycol, acrylic resin, aluminum phosphate and magnesium phosphate.

Embodiment 3

[0024] A. First prepare hydrochloric acid with a concentration of 25%, and slowly add aluminum ash to the hydrochloric acid at a rate of 5g / min according to the mass ratio of 1:9, keep at 60-70°C, keep stirring for 2 hours, and then age for 12 hours , and then filtered to obtain the filtrate;

[0025] B. Stir the filtrate continuously, add ammonia water with a concentration of 6% to the filtrate, and add 0.3% of the filtrate as an additive to the filtrate, keep the temperature at 80-90°C, adjust the pH value to 8-9, and continue Stir for 30 minutes, and obtain a stable alumina sol after aging for 8 hours. The auxiliary agent is at least one of polyvinyl alcohol, polyethylene glycol, acrylic resin, aluminum phosphate and magnesium phosphate.

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Abstract

The invention discloses a method for preparing an alumina sol, and the method comprises the steps of: adding aluminum ash to hydrochloric acid with a concentration of 10-30%, maintaining at a temperature of 70-100DEG C, continuously stirring for 2-10h, aging for 4-20h and filtering, wherein a weight ratio of the aluminum ash to the hydrochloric acid is from 1:5 to 1: 9; dropwise adding ammonia water with a concentration of 1% to 10% and additives into the obtained filtrate after the filtering and maintaining at a temperature of 80-100 DEG C, wherein the additives are at least one of polyvinyl alcohol, polyethylene glycol, acrylic resin, aluminum phosphate, and magnesium phosphate; and regulating a PH value to 8-9, stirring for 30min, and aging for 6-12h to obtain the alumina sol. According to the invention, the aluminum ash is used as a raw material for preparing the alumina sol, thereby consuming industrial solid waste aluminum ash to solve the environmental problem of difficulties in treating and landfilling the aluminum ash; and turning waste into treasure, and reducing the cost of the alumina sol.

Description

technical field [0001] The invention relates to the technical field of compound preparation and industrial waste recycling, in particular to a method for preparing alumina sol. Background technique [0002] Alumina sol is an inorganic polymer polyvalent polymer, its molecular formula is Al 2 (OH)Cl 6-n , can be regarded as a hydrolysis product between aluminum trichloride and aluminum hydroxide, so it is also called basic aluminum chloride. Alumina sol is prepared by exothermic reaction between hydrochloric acid and metal aluminum particles under certain conditions, and aluminum is dissolved in hydrochloric acid, hydrolyzed and polymerized. The chemical reaction formula is as follows: [0003] 2Al+(6-n)HCl+nH 2 O=Al 2 (OH)Cl 6-n +3H 2 [0004] Alumina sol is mainly used as a binder for catalytic cracking catalysts, which can not only enhance the anti-wear performance of the catalyst, but also improve its activation. In addition, alumina sol can also be used to prepar...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01F7/02
Inventor 不公告发明人
Owner YANCHENG SILU INFORMATION TECH SERVICE CO LTD
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