(1. 中国科学院 过程工程研究所，北京 100080；2. 中国科学院 研究生院，北京 100049)
摘 要: 研究铝酸钠溶液的盐酸中和过程对氢氧化铝晶体的形貌、晶型和铝酸钠溶液分解率的影响。结果表明：随着反应体系pH值的下降，氢氧化铝的形貌不断发生变化，且pH值越大，晶体越粗大；不论pH 值如何变化，氢氧化铝的晶型总是gibbsite型；铝酸钠溶液的分解率随溶液pH值降低而升高。
关键字: 铝酸钠；氢氧化铝；中和；纳米丝
neutralization of sodium aluminate solution
（1. Institute of Process Engineering, Chinese Academy of Sciences, Beijing 100080, China;
2. Graduate University, Chinese Academy of Sciences, Beijing 100049, China）
Abstract:Procedure for precipitating aluminium hydroxide from sodium aluminate solution was investigated, and hydrochloric acid was used as neutralization agent. Effects of pH value on the crystal morphology, crystal type and sodium aluminate decomposition ratio were studied. The experimental results show that the crystal morphology of aluminium hydroxide varies with the decreasing pH value of the solution, in addition, the higher the pH value, the larger the crystallites of the precipitates. No matter how the pH value changes, the precipitates always are gibbsite. The decomposition rate increases with the decrease of pH value.
Key words: sodium aluminate; aluminium hydrate; neutralization; nano-fibre
