Clean Roasting Process for Treating Vanadium Slag by Using Binary Sodium Salts System

doi:10.12068/j.issn.1005-3026.2019.09.014

Abstract

Abstract: The vanadium slag was treated by NaOH-Na₂CO₃ binary sodium salts in the roasting process and the influence of related kinetic parameters on roasting effect was investigated. The results showed that during the NaOH-Na₂CO₃ binary roasting process， the roasting temperature， roasting time and NaOH to Na₂CO₃ mass ratio play significant roles in the extraction rate of vanadium and chromium. The ferriferous oxide(Fe₃O₄)is oxidized to ferric oxide(Fe₂O₃)while V₂O₅ and Cr₂O₃ are converted to the β-natrium-vanadate type structure of Na₃VO₄ and orthorhombic-type crystal structure of Na₂CrO₄， respectively. Under the optimum roasting conditions(roasting temperature of 600℃， roasting time of 60min， and NaOH to Na₂CO₃ mass ratio of 1.5∶1)， the extraction rate of vanadium and chromium is 98.66% and 83.57%， respectively. The major metal element in the leaching residue is Fe.

Key words: vanadium slag, NaOH-Na₂CO₃ binary roasting, phase transformation, extraction rate, residue

CLC Number:

X756

TENG Ai-jun， XU Hong-hong， XUE Xiang-xin. Clean Roasting Process for Treating Vanadium Slag by Using Binary Sodium Salts System[J]. Journal of Northeastern University Natural Science, 2019, 40(9): 1291-1297.

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