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Minerals 2018, 8(4), 125; https://doi.org/10.3390/min8040125

Removal of Potassium and Iron in Low Grade Bauxite by a Calcination-Acid Leaching Process

1
School of Chemical Engineering and Energy, Zhengzhou University, Zhengzhou 450046, China
2
Research Institute of Henan Energy and Chemical Industry Group, Zhengzhou 450046, China
3
Henan Province Industrial Technology Research Institute of Resources and Materials, Zhengzhou 450046, China
*
Authors to whom correspondence should be addressed.
Received: 18 January 2018 / Revised: 12 March 2018 / Accepted: 16 March 2018 / Published: 22 March 2018
(This article belongs to the Special Issue Sustainable Mineral Processing Technologies)
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Abstract

In order to explore the commercialized applications of the low-grade bauxite in the refractory industry, a calcination integrated with acid leaching method was adopted to remove the potassium (K) and iron (Fe) from the diaspore-illite (DI) type low-grade bauxite. Following calcining the bauxite at different temperatures, the leaching parameters, including the sulfuric acid concentration, temperature, sulfuric acid to bauxite ratio, and reaction time were systematically studied. The appropriate and economical conditions for removing the impurities were found to be calcining the bauxite at 550 °C, and leaching it with a sulfuric acid solution of 1.2 mol/L, sulfuric acid/bauxite ratio of 9 mL/g at a reaction temperature of 70 °C and reaction time of 2 h, under these conditions, the removal efficiency of K and Fe from the bauxite can reach 30.32% and 47.33%, respectively. The treated bauxite was examined by XRD analysis, SEM observations, and chemical analysis. Kinetics of the removing process were calculated by two models, and the results showed that the leaching process was controlled by the mixed shrinking core model, which was affected by both the diffusion through solid layer and the interface transfer. In summary, the approach in this work presents a promising process for comprehensive utilization of the low-grade bauxite. View Full-Text
Keywords: low-grade bauxite; potassium and iron removal; calcination; acid leaching; kinetics low-grade bauxite; potassium and iron removal; calcination; acid leaching; kinetics
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).
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Li, Z.; Cao, Y.; Jiang, Y.; Han, G.; Fan, G.; Chang, L. Removal of Potassium and Iron in Low Grade Bauxite by a Calcination-Acid Leaching Process. Minerals 2018, 8, 125.

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