(1. 中國(guó)科學(xué)院 過程工程研究所 濕法冶金清潔生產(chǎn)技術(shù)國(guó)家工程實(shí)驗(yàn)室，北京 100190；
2. 中國(guó)科學(xué)院 研究生院，北京 100049；
3. 北京科技大學(xué) 循環(huán)與生態(tài)冶金教育部重點(diǎn)實(shí)驗(yàn)室，北京 100083)
摘 要: 在鋁酸鈉溶液中添加晶種制備一水軟鋁石的過程中，利用NaHCO3強(qiáng)化分解，研究一水軟鋁石晶種和NaHCO3添加方式對(duì)分解過程和產(chǎn)物的影響。結(jié)果表明：添加NaHCO3可以促進(jìn)鋁酸鈉溶液的分解，使相同條件下的分解率提高3倍，晶種系數(shù)SR在0~1.0范圍內(nèi)鋁酸鈉溶液中NaHCO3添加量為151.2 g/L時(shí)，分解率均高于80%。XRD和熱重結(jié)果表明：添加NaHCO3時(shí)，分解產(chǎn)物為一水軟鋁石和三水鋁石，SR越大或NaHCO3起始添加速率越慢，一水軟鋁石含量越高；當(dāng)SR=1.0且NaHCO3添加速率為0.21 g/(L·min)時(shí)，其含量可達(dá)到80.4%(質(zhì)量分?jǐn)?shù))；SR為0~1.0時(shí)，添加NaHCO3的產(chǎn)物是由一水軟鋁石和三水鋁石相互鑲嵌構(gòu)成的附聚體，分解過程采用逐步加快NaHCO3添加速率的方式有利于得到砂狀產(chǎn)物。
關(guān)鍵字: NaHCO3；鋁酸鈉溶液；分解；一水軟鋁石
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
