Preparation of superfine aluminium hydroxide
An ultra-fine aluminum hydroxide and carbon dioxide technology, which is applied in the preparation of alkali metal aluminate/alumina/aluminum hydroxide, etc., can solve the problems of large investment, limited commercial application and high equipment requirements
- Summary
- Abstract
- Description
- Claims
- Application Information
AI Technical Summary
Problems solved by technology
Method used
Image
Examples
preparation example Construction
[0012] The preparation method of said superfine aluminum hydroxide powder of the present invention, comprises the following steps;
[0013] Under the condition of 40~60℃, to alumina (Al 2 o 3 ) concentration is 60~140g / L sodium aluminate aqueous solution, adding concentration is the hydrochloric acid of 20wt%~35wt%, the addition of hydrochloric acid is 1~3% of the volume of sodium aluminate aqueous solution, after 1~3 minutes, add to this solution Into the carbon dioxide gas for precipitation reaction, the flow rate of carbon dioxide gas is 0.1 ~ 0.6m 3 / hr, until the pH value of the solution is 8.0 to 11.0, stop the precipitation reaction (stop feeding carbon dioxide gas), filter to obtain the precipitate, wash the resulting precipitate with deionized water and ethanol, and dry at 80 to 120°C for 4 to 6 Hours are the target product.
[0014] The invention is a method combining acid-base precipitation neutralization reaction and carbon content reaction, which has the advant...
Embodiment 1
[0017] Weigh 102g of sodium hydroxide and 153g of aluminum hydroxide respectively. Dissolve 102g of sodium hydroxide in 150ml of deionized water and heat to boiling. Add 153g of aluminum hydroxide to the boiling sodium hydroxide solution and react for 2 hours to obtain a transparent sodium aluminate solution. After suction filtering the sodium aluminate solution, add deionized water to dilute to 1 L to obtain the desired reaction solution with a concentration of 100 g / L (calculated as alumina).
[0018] After the diluted reaction solution was kept at 40°C, 20ml of hydrochloric acid with a mass concentration of 20% was added, stirred thoroughly for 2 minutes, and then carbon dioxide gas was introduced at a flow rate of 0.1m 3 / hr. When the pH value of the solution reaches 8, the precipitation reaction ends, and it is placed for aging for 30 minutes. The precipitate was washed with deionized water and ethanol, filtered, dried, and ground to obtain a white powder product.
[...
Embodiment 2
[0021] Weigh 102g of sodium hydroxide and 153g of aluminum hydroxide respectively. Dissolve 102g of sodium hydroxide in 150ml of deionized water and heat to boiling. Add 153g of aluminum hydroxide to the boiling sodium hydroxide solution and react for 2 hours to obtain a transparent sodium aluminate solution. After suction filtering the sodium aluminate solution, add deionized water to dilute to 1 L to obtain the desired reaction solution with a concentration of 100 g / L (calculated as alumina).
[0022] After the diluted reaction solution was kept at 60°C, 25ml of hydrochloric acid with a mass concentration of 35% was added, stirred thoroughly for 1 minute, and then carbon dioxide gas was introduced at a flow rate of 0.6m 3 / hr. When the pH value of the solution reaches 11, the precipitation reaction ends, and the solution is aged for 30 minutes. The precipitate was washed with deionized water and ethanol, filtered, dried, and ground to obtain a white powder product.
[00...
PUM
| Property | Measurement | Unit |
|---|---|---|
| particle diameter | aaaaa | aaaaa |
| size | aaaaa | aaaaa |
Abstract
Description
Claims
Application Information
Login to View More