期刊
INTERNATIONAL JOURNAL OF MINERALS METALLURGY AND MATERIALS
卷 23, 期 3, 页码 257-268出版社
SPRINGER
DOI: 10.1007/s12613-016-1234-z
关键词
waste utilization; red mud; calcification; carbonation; alumina; alkali; recovery
类别
资金
- National Natural Science Foundation of China [U1202274, 51204040]
- Research Fund for the Doctoral Program of Higher Education of China [20120042110011]
- Fundamental Research Funds for the Central Universities [N140204015]
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 CO2 partial 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 Na2O to Fe2O3 and of Al2O3 to Fe2O3 from 0.42 and 0.89 to 0.02 and 0.22, respectively. The processed red mud with less than 0.5wt% Na2O can potentially be used as a construction material.
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