铝酸钠溶液制备固体高纯铝酸钠实验研究  

Experimental Study on Preparation of High Purity Sodium Aluminate with Sodium Aluminate Solution

作　　者：刘世阳 焦芬[1,2] 刘维[1,2] 李琛[1,2] 董良民 王焕龙[1,2] 覃文庆 LIU Shiyang;JIAO Fen;LIU Wei;LI Chen;DONG Liangmin;WANG Huanlong;QIN Wenqing(School of Minerals Processing and Bioengineering,Central South University,Changsha 410083,Hunan,China;Hunan Provincial Key Laboratory of Clean and Efficient Utilization of Strategic Calcium-Containing Mineral Resources,Central South University,Changsha 410083,Hunan,China)

机构地区：[1]中南大学资源加工与生物工程学院,湖南长沙410083 [2]中南大学战略含钙矿物资源清洁高效利用湖南省重点实验室,湖南长沙410083

出　　处：《矿冶工程》2024年第2期100-105,共6页Mining and Metallurgical Engineering

基　　金：国家重点研发计划(2020YFC1909203,2018YFC1902505);国家自然科学基金面上项目(51874356)。

摘　　要：以铝酸钠水溶液为原料,通过蒸发-冷却析晶-脱水提纯工艺制备高纯固体铝酸钠,研究了添加剂对体系苛性比及析晶产物的影响以及铝酸钠溶液蒸发结晶过程的作用及行为。结果表明,以NaOH为添加剂能增加溶液体系苛性比,使蒸发结晶产物转变为NaAlO_(2);添加NaAlO_(2)晶种、以NaOH为添加剂调节体系苛性比至1.36,蒸发温度100℃、结晶时间2 h、搅拌速率300 r/min条件下,可获得纯度88.1%的铝酸钠产品;在脱水温度200℃、脱水时间1 h、乙醇100℃提纯1 h条件下,可得到纯度93.8%、晶体粒度5~25μm的固体高纯铝酸钠。High purity sodium aluminate was prepared with sodium aluminate solution by adopting a process consisting of evaporation,cooling crystallization,and dewatering for purification.The effects of additives on caustic ratio and crystallization products,as well as the function and behavior of sodium aluminate solution during evaporation and crystallization were studied.The results show that with NaOH as an additive,the caustic ratio of the solution system can be increased,and the product from evaporation and crystallization can be converted to NaAlO_(2).By using NaAlO_(2) as seed crystal and adjusting the caustic ratio of system to 1.36 with NaOH,the product of NaAlO_(2) with purity of 88.1%can be obtained after evaporation at 100℃for 2 h with stirring rate of 300 r/min.Then,after 1 h dewatering at 200℃and 1 h purification with alcohol at 100℃,a kind of solid NaAlO_(2) can be obtained with purity of 93.8%and crystal particles of 5-25μm.

关 键 词：高纯铝酸钠 蒸发结晶 苛性比 提纯 

分 类 号：TF111[冶金工程—冶金物理化学]