Enhancement on Synthesis of Boehmite Through a Precarbonization-assisted Hydrogen Peroxide Route in Highly Alkaline Sodium Aluminate Solutions

Abstract

Abstract: Hydrogen peroxide(H₂O₂)precipitation from sodium aluminate(SA)solution at close-ambient temperature is an efficient method to synthesize boehmite and its derived alumina with high surface area,but the precipitation yield of Al₂O₃ is usually below 50%in highly alkaline SA solutions.Here the synthesis of boehmite is enhanced through a precarbonization-assisted H₂O₂ route in highly alkaline SA solutions.It is found that the crystal structure of the precipitation product is evidently influenced by the precipitation conditions.As the precipitation temperature increases from 273 to 325 K,a small amount of gibbsite by-product is formed.As the aging temperature increases from 301 to 333 K,the crystallinity of boehmite decreases and part of the boehmite dissolves due to an increase in the pH value.Based on the above results,a precarbonization-assisted H₂O₂ route is proposed to obtain pure boehmite with more complete recovery of Al₂O₃ from highly alkaline SA solutions.The route includes a controllable precarbonization step of SA solutions with a molar ratio of Na₂O to Al₂O₃ higher than 2:1,followed by the H₂O₂-precipitated step with a molar ratio of H₂O₂ to Al₂O₃ less than 7:1.Because of its facile operation conditions,no extraneous impurity,time saving and a possible recycle of the filtrate,the route has great potential to be an alternative method for preparation of boehmite and its derived alumina.

Key words: boehmite, sodium aluminate solution, hydrogen peroxide, precarbonization

摘要： Hydrogen peroxide(H₂O₂)precipitation from sodium aluminate(SA)solution at close-ambient temperature is an efficient method to synthesize boehmite and its derived alumina with high surface area,but the precipitation yield of Al₂O₃ is usually below 50%in highly alkaline SA solutions.Here the synthesis of boehmite is enhanced through a precarbonization-assisted H₂O₂ route in highly alkaline SA solutions.It is found that the crystal structure of the precipitation product is evidently influenced by the precipitation conditions.As the precipitation temperature increases from 273 to 325 K,a small amount of gibbsite by-product is formed.As the aging temperature increases from 301 to 333 K,the crystallinity of boehmite decreases and part of the boehmite dissolves due to an increase in the pH value.Based on the above results,a precarbonization-assisted H₂O₂ route is proposed to obtain pure boehmite with more complete recovery of Al₂O₃ from highly alkaline SA solutions.The route includes a controllable precarbonization step of SA solutions with a molar ratio of Na₂O to Al₂O₃ higher than 2:1,followed by the H₂O₂-precipitated step with a molar ratio of H₂O₂ to Al₂O₃ less than 7:1.Because of its facile operation conditions,no extraneous impurity,time saving and a possible recycle of the filtrate,the route has great potential to be an alternative method for preparation of boehmite and its derived alumina.

关键词: boehmite, sodium aluminate solution, hydrogen peroxide, precarbonization

CAI Weiquan, LI Huiquan, ZHANG Guangxu. Enhancement on Synthesis of Boehmite Through a Precarbonization-assisted Hydrogen Peroxide Route in Highly Alkaline Sodium Aluminate Solutions[J]. , 2010, 18(3): 500-505.

蔡卫权, 李会泉, 张光旭. Enhancement on Synthesis of Boehmite Through a Precarbonization-assisted Hydrogen Peroxide Route in Highly Alkaline Sodium Aluminate Solutions[J]. , 2010, 18(3): 500-505.

References

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