Oxidation roasting is an effective way to recover vanadium (V) and chromium (Cr) from vanadium slag but is severely limited by carbon reduction and energy conservation. Herein, a novel method is proposed employing a microbubble-assisted liquid phase oxidation technique , the recovery efficiencies of V and Cr reached 94.11 % and 80.27 %, respectively. The decomposition and oxidization mechanisms of low-valent V and Cr spinels were investigated. Leaching kinetics analyzes demonstrated that microbubbles effectively enrich hydroxide ions on the solid surface and disrupt diffusion resistance, promoting adequate exposure of spinel. The UV and XPS results revealed that the Cr(VI) proportion increased to 12.30 % and 97.2 %, respectively, in tailings and leachate. More importantly, hydroxyl radicals (·OH) were detected during the leaching process, confirming the performance of the self-catalytic oxidation reaction. These discoveries offer a novel pathway with high oxidation efficiency, low energy consumption, and more environmental friendliness for recycling valuable metals from amphoteric mineral resources.

中文翻译：

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微泡辅助液体氧化从钒渣中高效一步相分解回收V和Cr

氧化焙烧是从钒渣中回收钒（V）和铬（Cr）的有效方法，但受到减碳和节能的严重限制。本文提出了一种采用微泡辅助液相氧化技术的新方法，V和Cr的回收率分别达到94.11%和80.27%。研究了低价V、Cr尖晶石的分解和氧化机理。浸出动力学分析表明，微泡有效地富集固体表面上的氢氧根离子并破坏扩散阻力，促进尖晶石的充分暴露。UV和XPS结果表明，尾矿和渗滤液中Cr(VI)的比例分别增加至12.30%和97.2%。更重要的是，在浸出过程中检测到羟基自由基（·OH），证实了自催化氧化反应的性能。这些发现为从两性矿产资源中回收有价金属提供了一条氧化效率高、能耗低、环境友好的新途径。