Competitive crystallization, in situ separation and solidification mechanism of Cr-spinel crystal from Cr-bearing slag

Abstract

Cr-Spinel is reported as an outstanding phase to solidify Cr in Cr-bearing slag, while the ambiguity of solidification mechanism for Cr-spinel crystals seriously limits the recovery and utilization of Cr...

Crystallization behavior and crystal characterization of V-spinel in vanadium slag via in situ separation: displacement mechanism of V and Ti

“…Hence, the recovery ratio of V in V-spinel was calculated through eqn (2). 22,23 where, R V is the recovery ratio of V in V-spinel, m spinel and m slag are the mass of V-spinel and slag phase, and ω spinel and ω slag are V content in V-spinel and slag phase, respectively.…”

“…In the XRD characterization process, Cu Kα radiation was used and the acquisition step and scan rate were set to 0.02°and 0.2°min −1 , respectively. The required data in an angular range of 2θ = 10-90°was used for the Rietveld refinement using the software Fullprof Suite 22,24 to obtain the crystal parameters of V-spinel crystals. In the refinement process, the Pseudo-Voigt profile function and the crystal structure model of the standard card Fe 2.5 Ti 0.5 O 4 (PDF: 75-1376) with the Fd3 ¯m space group was used and the order of refinement steps was the global parameters and the phase parameters, which included background coefficients, zero coefficient, scale coefficient, cell parameters, FWHM parameters, shape parameters, atomic sites and occupancies.…”

“…In order to disclose the crystal structure and elemental substitution of V-spinel in vanadium slag, in situ separation of V-spinel formed in molten vanadium slag was carried out via super-gravity based on its significant enhancement on mass transfer and interphase separation. 17–22…”

“…In order to disclose the crystal structure and elemental substitution of V-spinel in vanadium slag, in situ separation of V-spinel formed in molten vanadium slag was carried out via super-gravity based on its significant enhancement on mass transfer and interphase separation. [17][18][19][20][21][22] In this study, the crystallization behavior of V-spinel was studied, and in situ separation of high-purity V-spinel crystals from molten vanadium slag was conducted via super-gravity. Moreover, the crystal structures of various high-purity V-spinels were characterized, and the displacement mechanism of V and Ti in V-spinel was verified.…”