Issue 17, 2024

Crystallization behaviour and growth mechanisms of spinel crystals in vanadium slag with high MgO content

Abstract

Increasing the MgO content in vanadium slag is a prerequisite for implementing slag splashing to protect the furnace. The increase in MgO content will inevitably cause changes in the phase structure of vanadium slag, thereby affecting the extraction of vanadium. In this study, the effect of MgO on the crystallization behavior of the spinel phase in vanadium slag was systematically investigated. It was found that the spinel phases in vanadium slag with high MgO content were mainly FeV2O4, Fe2TiO4, MgV2O4 and Mg2TiO4, and the nucleation and growth rates of the above crystals increased significantly with the increase of FeO/SiO2 ratio and MgO content. With the increase of FeO/SiO2 from 1 to 3, the combined crystallization rate of Fe2TiO4, FeV2O4, and Mg2TiO4 increased by two orders of magnitude, and the total spinel crystallization rate of MgV2O4 and spinel also increased by one order of magnitude. The effect of the MgO content on the crystallization of the crystals was not as significant as the FeO/SiO2 ratio. The optimum crystallization temperature of the total spinel in vanadium slag is determined with MgV2O4, which has the highest melting point, and the optimum crystallization temperature interval is 1500–1650 K. During the cooling process of the vanadium slag, MgV2O4 is first crystallized, then Mg2TiO4 and FeV2O4, and finally Fe2TiO4. When the cooling rate is 5 K min−1 and the temperature drops from 1773 K to 1623 K, the average grain size of the spinel gradually increases, and the growth of the spinel in vanadium slag with high MgO content is controlled by the supply.

Graphical abstract: Crystallization behaviour and growth mechanisms of spinel crystals in vanadium slag with high MgO content

Article information

Article type
Paper
Submitted
29 Feb 2024
Accepted
24 Mar 2024
First published
25 Mar 2024

CrystEngComm, 2024,26, 2248-2258

Crystallization behaviour and growth mechanisms of spinel crystals in vanadium slag with high MgO content

J. Diao, H. Tao, Z. Lai, Y. Qiu, L. Chen, H. Li and B. Xie, CrystEngComm, 2024, 26, 2248 DOI: 10.1039/D4CE00189C

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