(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: 采用亚熔盐法对赤泥中的Al2O3和Na2O的回收进行研究。实验第一步通过采用亚熔盐和添加适量石灰乳液回收赤泥中的Al2O3，使其中Al2O3的含量降至4.19%，Al2O3单程回收率达88%；实验第二步采用低浓度的NaOH溶液对赤泥进行深度脱钠，使得最终赤泥中Al2O3和Na2O的含量分别降到3.88%和1.39%，Al2O3/SiO2和Na2O/ SiO2相应降到0.17和0.06；经过回收Al2O3和Na2O后的终赤泥呈现出表面疏松多孔的颗粒状形貌。本研究在较低温的条件下综合回收赤泥中的Al2O3和Na2O。
关键字: 赤泥；亚熔盐；氧化铝；氧化钠
（1. Institute of Process Engineering, Chinese Academy of Sciences, Beijing 100080, China;
2. Graduate University of Chinese Academy of Sciences, Beijing 100049, China）
Abstract:The recovery of Al2O3 and Na2O from red mud by sub-molten salt was investigated. In the first stage, via the application of a mixed system comprised of sub-molten salt and lime milk, the content of Al2O3 in the red mud was reduced to 4.19% and 88% of Al2O3 was recovered. In the second stage, the removal of Na2O was investigated by using NaOH solution with a low concentration. The results showed as follows: the content of Al2O3 in the final red mud with lacunaris configuration was reduced to 3.88%, the content of Na2O was reduced to 1.39%, Al2O3/SiO2 i.e. A/S, decreased to 0.17 and Na2O/SiO2 , i.e. N/S, decreased to 0.06. By the application of sub-molten salt, most Al2O3 and Na2O in red mud was recovered under low temperature.
Key words: red mud; sub-molten salt; alumina; sodium oxide
