Study on quantitative phase analyses of red mud by Rietveld method from X-ray powder diffraction
ZENG Chao1, HE Wei*2
1. Guangxi International Business Vocational College, Nanning 530007,China; 2. State Key Laboratory of Nonferrous Metals and Particular Materials Processing Technology of Guangxi, Guangxi University, Nanning 530004,China
Abstract：Red mud is the solid slag produced in the production process of aluminum oxide with bauxite as rawmaterial. In consideration of waste recovery and environment protection, it was of more practical significance for the comprehensive utilization of red mud to acquire its phase composition and content. The red mud sample provided by Pingguo Aluminum Manufacturer was analyzed by X-ray powder diffraction method and its phase was quantitatively analyzed by Rietveld full spectrum fitting method and the traditional reference intensity ratio (RIR) method. In Rietveld method, the overlapping peak effect was overcome by full spectrum data. It proved that the quantitative determination results of Rietveld method were more accurate than RIR method. Through Rietveld method, it was found that there were nine phases in red mud, such as hydrogrossular, hematite, wischnewite, perovskite, diaspore, cronstedtite, calcite, goethite and titania, and their contents were 42.0%, 27.7%, 16.5%, 6.6%, 2.4%, 1.8%, 1.2%. 0.9% and 0.8%, respectively.
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