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Method for producing superfine aluminum hydroxide and aluminum oxide by using solution of aluminum chloride

A technology of ultra-fine aluminum hydroxide and aluminum chloride, which is applied in the field of production of ultra-fine aluminum hydroxide and alumina with low iron content, can solve the problems of high raw material requirements, complex production process, production process and raw material limitation, and achieve technological The effect of short process, guaranteed product purity and simple operation

Active Publication Date: 2010-10-20
CHINA SHENHUA ENERGY CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Both methods need to use alkaline sodium metaaluminate solution as raw material, so there are certain restrictions on the production process and raw materials
Other methods have the disadvantages of high raw material requirements and complex production processes.

Method used

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  • Method for producing superfine aluminum hydroxide and aluminum oxide by using solution of aluminum chloride
  • Method for producing superfine aluminum hydroxide and aluminum oxide by using solution of aluminum chloride
  • Method for producing superfine aluminum hydroxide and aluminum oxide by using solution of aluminum chloride

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] (1) Using AlCl 3 Concentration is 2.3mol / L, and the aluminum chloride solution that contains iron (calculated as iron oxide) 1.9g / L is raw material, adopts the mode of single column to adsorb and remove iron with D001 (Anhui Wandong Chemical Factory) resin at room temperature, The flow rate of aluminum chloride solution is 2 times of resin volume / hour. It was determined that the iron content (calculated as iron oxide) in the treated refined solution was reduced to 0.24 mg / L.

[0025] (2) Add 5 wt% of PEG4000 as a dispersant to the aluminum chloride refined solution, and the amount of the dispersant is 5% of the volume of the refined solution to obtain a dispersion.

[0026] (3) Gradually add ammonia water with a concentration of 1 mol / L to the dispersion liquid under stirring until the pH value of the solution is 8 to obtain an aluminum hydroxide slurry. Vacuum filter the aluminum hydroxide slurry, wash with water 4 times and alcohol 2 times, and dry in a vacuum oven ...

Embodiment 2

[0029] Except step (1), other other operating process conditions are all identical with embodiment 1. Process condition in step (1) is adjusted to:

[0030] (1) Using AlCl 3 Concentration is 2.3mol / L, and the aluminum chloride solution that contains iron (calculated as iron oxide) 1.9g / L is raw material, with the resin column that JK008 (Anhui Wandong chemical plant) resin is housed at room temperature, adopts double-column string Iron removal is carried out in a continuous manner, and the flow rate of the aluminum chloride solution is 4 times the resin volume / hour. After treatment, the iron content (calculated as iron oxide) in the refined solution was reduced to 0.21mg / L.

[0031] It has been determined that the particle size of ultra-fine aluminum hydroxide is ~0.2 microns, and the specific surface area is 211m 2 / g, the iron oxide content is 0.010wt%.

Embodiment 3

[0033] Change the raw material of aluminum chloride solution to AlCl 3 Aluminum chloride solution with a concentration of 1.7mol / L and an iron content (calculated as iron oxide) of 2.6g / L. All operating process conditions are identical with embodiment 1. Ultrafine aluminum hydroxide product is obtained after resin adsorption, neutralization, filtration, washing and drying.

[0034] It has been determined that the particle size of ultra-fine aluminum hydroxide is ~0.2 microns, and the specific surface area is 217m 2 / g, the iron oxide content is 0.015wt%.

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Abstract

The invention provides a method for preparing superfine aluminum hydroxide and superfine aluminum oxide by using solution of aluminum chloride as a raw material. The method comprises the following steps of: a) adjusting the concentration of the solution of the aluminum chloride, and passing the solution of the aluminum chloride into a macroporous type cation resin column to remove iron so as to obtain a refined solution of the aluminum chloride; b) adding dispersant solution into the refined solution of the aluminum chloride, and blending the mixture uniformly to obtain dispersion solution; and c) passing ammonia water into the dispersion solution to generate an aluminum hydroxide deposit, and filtering, washing and drying the deposit to obtain the superfine aluminum hydroxide. The superfine aluminum hydroxide can be calcined at different temperatures to obtain gamma-aluminum oxide and alpha-aluminum oxide respectively. Compared with other methods, the method has the advantages of wide source of raw materials, simple production process and high product purity.

Description

technical field [0001] The invention relates to a method for preparing superfine aluminum hydroxide and aluminum oxide by using aluminum chloride solution, and is especially suitable for producing ultrafine aluminum hydroxide and aluminum oxide with low iron content by using iron-containing aluminum chloride solution. Background technique [0002] Ultrafine aluminum hydroxide generally refers to ultrafine aluminum hydroxide with uniform particles and an average particle size of less than 1 μm. It is widely used in chemistry, medicine, catalysts and their carriers, rubber, pigments, papermaking, refractory materials, and insulating materials. , Ceramics and other fields play an extremely important role in the national economy. Due to its excellent physical and chemical properties, ultra-fine alumina is also widely used in various technical fields such as machinery, metallurgy, petroleum, chemical industry, electronics, optics, nuclear reaction, and aerospace. [0003] The pr...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01F7/34C01F7/30
Inventor 魏存弟郭昭华蒋引珊张培萍杨殿范孙延彬
Owner CHINA SHENHUA ENERGY CO LTD
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