The sodium roasted-acid leaching tailing (SRALT) of vanadium slag with a certain amount of vanadium exhibits potential environmental risk. To investigate the leaching behavior of vanadium from the SRALT, neutral batch leaching tests were performed. The evolution of vanadium concentration, pH, redox potential (Eh), dissolved oxygen, and conductivity as a function of time was measured. Pourbaix diagrams of V–H₂O system with different vanadium concentrations were obtained to identify the ionic speciation of vanadium in leachate. X-ray diffraction, X-ray photoelectron spectroscopy, field emission-scanning electron microscopy, and thermogravimetry–differential scanning calorimetry analysis were conducted to investigate the mineralogical evolution of the SRALT during the leaching process. It was found that the major minerals of the original SRALT are titanomagnetite, spinel, olivine, and augite. The valence states of V existing in the original SRALT are V³⁺ and V⁵⁺. The pH and Eh values of the obtained leachates are 10.00–10.58 and (−43)–(+67) mV, respectively. In this pH and Eh region, the released vanadium is mainly present as HVO₄²⁻. The FeOOH and CaCO₃ would form during the leaching process. The HVO₄²⁻ would be mainly adsorbed by the FeOOH and slightly incorporated into the CaCO₃, resulting in the decline in the vanadium concentration. The vanadium concentration above 27 mg L⁻¹ and the dissolved oxygen value below 5.0 mg L⁻¹ can be obtained after a short leaching period. As a V(V)-releasing and oxygen-depleting substance, the leaching toxicity of the SRALT should not be ignored.

一定量钒的钒渣钠焙酸浸尾矿（SRALT）具有潜在的环境风险。为了研究 SRALT 中钒的浸出行为，进行了中性批次浸出试验。测量了钒浓度、pH、氧化还原电位 (Eh)、溶解氧和电导率随时间的变化。_{V-H 2}的 Pourbaix 图获得不同钒浓度的O体系，以鉴定渗滤液中钒的离子形态。进行了 X 射线衍射、X 射线光电子能谱、场发射扫描电子显微镜和热重-差示扫描量热分析，以研究 SRALT 在浸出过程中的矿物学演化。发现原始SRALT的主要矿物是钛磁铁矿、尖晶石、橄榄石和辉石。原始SRALT中存在的V的价态是V ³⁺和V ⁵⁺。所得渗滤液的 pH 值和 Eh 值分别为 10.00–10.58 和 (-43)–(+67) mV。在这个 pH 值和 Eh 区域，释放的钒主要以 HVO ₄ ^2-形式存在。FeOOH 和 CaCO₃会在浸出过程中形成。HVO ₄ ^2-将主要被FeOOH 吸附并少量掺入CaCO ₃中，导致钒浓度下降。浸出时间短，可得到27 mg L ^-1以上的钒浓度和5.0 mg L ^-1以下的溶解氧值。作为释放 V(V) 和耗氧物质，SRALT 的浸出毒性不容忽视。