(1. 中國科學院 過程工程研究所，北京 100080；2. 中國科學院 研究生院，北京 100049)
摘 要: 采用亞熔鹽法對赤泥中的Al2O3和Na2O的回收進行研究。實驗第一步通過采用亞熔鹽和添加適量石灰乳液回收赤泥中的Al2O3，使其中Al2O3的含量降至4.19%，Al2O3單程回收率達88%；實驗第二步采用低濃度的NaOH溶液對赤泥進行深度脫鈉，使得最終赤泥中Al2O3和Na2O的含量分別降到3.88%和1.39%，Al2O3/SiO2和Na2O/ SiO2相應降到0.17和0.06；經過回收Al2O3和Na2O后的終赤泥呈現(xiàn)出表面疏松多孔的顆粒狀形貌。本研究在較低溫的條件下綜合回收赤泥中的Al2O3和Na2O。
關鍵字: 赤泥；亞熔鹽；氧化鋁；氧化鈉
（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
