亚熔盐法回收赤泥  

Recovery of Al2O3 and Na2O from red mud by sub-molten salt

作　　者：钟莉[1,2] 张亦飞[1] 

机构地区：[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

出　　处：《中国有色金属学报》2008年第E01期70-73,共4页The Chinese Journal of Nonferrous Metals

基　　金：国家重点基础研究发展计划资助项目（2007CB613501）

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。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.

关 键 词：赤泥 亚熔盐 氧化铝 氧化钠 

分 类 号：TQ133.1[化学工程—无机化工]