Extraction of Si from Alkaline-Roasted Boron Ore Concentrate

Document Type : Research Article

Authors

1 School of Metallurgy, Northeastern University, Shenyang 110819, P.R. CHINA

2 Liaoning Institute of Science and Technology, Benxi, 117000, P.R. CHINA

3 Department of Materials Science and Engineering, University of Utah, Salt Lake City, UT 84112, USA

4 School of Metallurgy and Environment, Central South University, Changsha 410083, P.R. CHINA

Abstract

The process of alkali roasting boron ore concentrate was proposed for the problems existing in the process of boron ore concentrate smelting. In this research, the influencing factors included the molar ratio of alkali to boron ore concentrate, roasting temperature, and roasting time were investigated. The single experiment and orthogonal experiments show the optimal conditions for roasting under the conditions evaluated including a temperature of 550oC, roasting time of 60 min, and a molar ratio of alkali to ore of 3:1. In the roasting process, the Si extraction correlated with the shrinking core model assuming a solid product layer according to XRD and SEM. Thus, the kinetics is controlled by diffusion through the product layer. The apparent activation energy for Si extraction was 13.47kJ/mol, and the roasting rate can be expressed as:
1-(2/3α)-(1-α)2/3=1.428×10-2exp(-13470/RT)t.

Keywords

Main Subjects

References

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Iranian Journal of Chemistry and Chemical Engineering
Volume 40, Issue 6 - Serial Number 110
November and December 2021
Pages 1999-2007

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