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Preparation method of nano alumina material

A technology of nano-alumina and alumina, which is applied in chemical instruments and methods, preparation of alkali metal aluminate/alumina/aluminum hydroxide, separation methods, etc., and can solve problems such as high cost and demanding technical requirements

Inactive Publication Date: 2004-02-25
SHANGHAI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, the preparation method of alumina nanomaterials needs to use more expensive raw materials (such as alkoxides or aluminum chloride, aluminum nitrate, etc.), or use demanding grinding techniques, so the cost is relatively high.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] Example 1: At room temperature, take 0.32 L of sodium aluminate solution after desiliconization in industrial production, and slowly add 4 L of saturated NaHCO 3 solution, while stirring, measure the pH. The addition was stopped when the pH reached 8.75. The resulting precipitate was filtered and washed, then transferred to hot water at 60°C for dispersion, then filtered, washed with hot water, and then washed with dilute nitric acid. Put the precipitate in distilled water to disperse the gel, stir, heat up to about 90°C, adjust the pH value with 0.07mol / L dilute acetic acid, and add the acid at a ratio of H + / Al 3+ =0.15, the pH value is controlled at around 3.5. After aging at 80°C for 6h, a stable and transparent sol was obtained. will contain Al 2 o 3 200g of 10% sol and 400mL of n-butanol are heated and distilled, and the azeotrope of water and n-butanol and excess n-butanol are distilled at 90-120°C. After the distillation is completed, the light yellow loo...

Embodiment 2

[0022] Example 2: At room temperature, take 0.32 L of sodium aluminate solution after desiliconization in industrial production, and slowly add 4 L of saturated NaHCO 3 solution, while stirring, measure the pH. The addition was stopped when the pH reached 9.5. The resulting precipitate was filtered and washed, then transferred to 80°C hot water for dispersion, then filtered, washed with hot water, and then washed with dilute nitric acid. Put the precipitate in distilled water to disperse the gel, stir, heat to about 80°C, adjust the pH value with 0.10mol / L dilute hydrochloric acid, the ratio of adding acid is H + / Al 3+ =0.20, the pH value is controlled at around 3.7. After aging at 70°C for 10 h, a stable and transparent sol was obtained. will contain Al 2 o 3 200g of 10% sol and 400mL n-butanol are heated and distilled, and the azeotrope of water and n-butanol and excess n-butanol are distilled at 90-120°C. Burning at ℃ for 3h, the nanometer α-Al of about 30nm can be ...

Embodiment 3

[0023] Example 3: At room temperature, take 0.32 L of sodium aluminate solution after desiliconization in industrial production, and slowly add 4 L of saturated NaHCO 3 solution, while stirring, measure the pH. The addition was stopped when the pH reached 10.9. The resulting precipitate was filtered and washed, then transferred to hot water at 70°C for dispersion, then filtered, washed with hot water, and then washed with dilute nitric acid. Put the precipitate in distilled water to disperse the gel, stir, heat to about 100°C, adjust the pH value with 0.14mol / L dilute nitric acid, and add the acid at a ratio of H + / Al 3+ =0.25, the pH value is controlled at around 4.3. Aged at 60°C for 16h, a stable and transparent sol was obtained. will contain Al 2 o 3 200g of 10% sol and 400mL of n-butanol are heated and distilled, and the azeotrope of water and n-butanol and excess n-butanol are distilled at 90-120°C. After the distillation is completed, the light yellow loose powde...

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Abstract

The present invention relates to a nano alumina material, and its production method includes the following steps: using sodium aluminate and sodium hydrogen carbonate solutions to make them directly implement reaction, then filtering, dispersing, washing and adding acid to make beat-dispersion and ageing to obtain the transparent sol for preparing nano alumina material, and using said sol to directly produce nano alumina powder or nano alumina ceramic filter membrane.

Description

technical field [0001] The invention relates to a nano-alumina material, which is nano-alpha-Al 2 o 3 pink. The invention also relates to a nano-alumina ceramic filter membrane. Background technique [0002] α-alumina nanopowder is the raw material for the manufacture of alumina ceramics with a certain degree of toughness, which has attracted widespread attention in the nanomaterials industry. At present, the preparation method of aluminum oxide nanomaterials needs to use more expensive raw materials (such as alkoxide or aluminum chloride, aluminum nitrate, etc.), or use a grinding technique with strict technical requirements, so the cost is relatively high. Contents of the invention [0003] The object of the invention is to provide a kind of nano α-Al 2 o 3 pink. [0004] Another object of the present invention is to provide a nano-alumina ceramic filter membrane. [0005] The present invention is realized through the following steps: [0006] 1) Slowly add the s...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D39/20B01D71/02B01J13/00C01F7/14C04B41/85
Inventor 张良苗陈念贻陆文聪
Owner SHANGHAI UNIV
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