Alumina and sodium recovery from Bayer red mud
Soda-lime roasting was carried out on red mud under reductive atmosphere prior to leaching for recovery of valuable elements such as Al and Na from the red mud. Changes occurring in the mineral phases and the recovery of Al and Na were investigated under different conditions. Experimental results showed that spinel, sodium aluminosilicate, and larnite were major phases in the roasted samples, as well as some calcium aluminoferrite, melilite and wustite. Current study found that, by leaching a roasted sample (with a Ca/Si mole ratio of 2.38) for 15 min at 60 ℃ in water, the highest recovery of Al and Na was about 70.3％ and 79.6％, respectively. The addition of CaO within a certain limit was found to reduce the Si content of the sodium aluminosilicate phase and resulted in an enhanced extraction of Na and Al from the sintered red mud. Some of the factors influencing the leaching and hence the recovery of Na and Al are discussed.
Red mud soda-lime roasting process leaching phase transformation
Wanchao Liu Ling Zhang Shouyi Sun Jiakuan Yang Sharif Jahanshahi
School of Environmental Science Engineering, Huazhong University of Science Technology CSIRO Mineral CSIRO Minerals Down Under National Research Flagship School of Environmental Science Engineering, Huazhong University of Science Technology School of Environmental Science Engineering, Huazhong University of Science and Technology
国际会议
XVIII International Symposium of ICSOBA(第18届国际铝土矿、氧化铝及铝工业学术年会)
郑州
英文
454-461
2010-11-25（万方平台首次上网日期，不代表论文的发表时间）