Recovery of alkali and alumina from Bayer red mud by the calcification–carbonation method

被引:16
|
作者
Xiao-feng Zhu [1 ]
Ting-an Zhang [1 ]
Yan-xiu Wang [1 ]
Guo-zhi Lü [1 ]
Wei-guang Zhang [1 ]
机构
[1] Key Laboratory of Ecological Utilization of Multi-metal Intergrown Ores of the Ministry of Education, School of Materials and Metallurgy, Northeastern University
基金
中国国家自然科学基金; 中央高校基本科研业务费专项资金资助; 高等学校博士学科点专项科研基金;
关键词
waste utilization; red mud; calcification; carbonation; alumina; alkali; recovery;
D O I
暂无
中图分类号
X758 [有色金属工业];
学科分类号
083002 ;
摘要
Red mud produced in the Bayer process is a hazardous solid waste because of its high alkalinity; however, it is rich in valuable components such as titanium, iron, and aluminum. In this study, a novel calcification–carbonation method was developed to recover alkali and alumina from Bayer red mud under mild reaction conditions. Batch experiments were performed to evaluate the potential effects of important parameters such as temperature, amount of CaO added, and COpartial pressure on the recovery of alkali and alumina. The results showed that 95.2% alkali and 75.0% alumina were recovered from red mud with decreases in the mass ratios of NaO to FeOand of AlOto FeOfrom 0.42 and 0.89 to 0.02 and 0.22, respectively. The processed red mud with less than 0.5wt% NaO can potentially be used as a construction material.
引用
收藏
页码:257 / 268
页数:12
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