(1. 中国科学院 过程工程研究所 湿法冶金清洁生产技术国家工程实验室，北京 100190；
2. 中国科学院 研究生院，北京 100049；
3. 北京科技大学 循环与生态冶金教育部重点实验室，北京 100083)
摘 要: 在铝酸钠溶液中添加晶种制备一水软铝石的过程中，利用NaHCO3强化分解，研究一水软铝石晶种和NaHCO3添加方式对分解过程和产物的影响。结果表明：添加NaHCO3可以促进铝酸钠溶液的分解，使相同条件下的分解率提高3倍，晶种系数SR在0~1.0范围内铝酸钠溶液中NaHCO3添加量为151.2 g/L时，分解率均高于80%。XRD和热重结果表明：添加NaHCO3时，分解产物为一水软铝石和三水铝石，SR越大或NaHCO3起始添加速率越慢，一水软铝石含量越高；当SR=1.0且NaHCO3添加速率为0.21 g/(L·min)时，其含量可达到80.4%(质量分数)；SR为0~1.0时，添加NaHCO3的产物是由一水软铝石和三水铝石相互镶嵌构成的附聚体，分解过程采用逐步加快NaHCO3添加速率的方式有利于得到砂状产物。
关键字: NaHCO3；铝酸钠溶液；分解；一水软铝石
intensified by adding NaHCO3
（1. National Engineering Laboratory for Hydrometallurgical Cleaner Production Technology,
Institute of Process Engineering, Chinese Academy of Sciences, Beijing 100190, China;
2. Graduate University of Chinese Academy of Sciences, Beijing 100049, China;
3. Key Laboratory Recycling and Ecologic Metallurgy, Ministry of Education,
University of Science and Technology Beijing, Beijing 100083, China）
Abstract:Boehmite was precipitated with seeds from sodium aluminate solution intensified by NaHCO3, and the influence of seed ratio (SR) and adding NaHCO3 methods on precipitation process and products was studied. The results show that NaHCO3 can intensify the precipitation process of sodium aluminate solution and the precipitation ratio can be enhanced by 3 times under the same condition. When SR is 0−1.0 and the amount of adding NaHCO3 comes to 151.2 g/L, the precipitation ratio is all higher than 80%. XRD and TG results indicate that the products consist of boehmite and gibbsite, and increasing SR or slowing down the initial rate of adding NaHCO3 can improve the mass fraction of boehmite, which gets the value of 80.4% with SR=1.0 and adding amount of NaHCO3 of 0.21 g/(L·min). The boehmite and gibbsite particles are inlaid together to form aggregates with SR of 0−1.0 and NaHCO3. The sand products can be got by gradually increasing the amount of adding NaHCO3 in the precipitation process.
Key words: NaHCO3; sodium aluminate solution; precipitation; boehmite
