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
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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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