利用攀钢提钒尾渣制备富钒渣的研究

以攀钢提钒尾渣酸浸得到的溶液为沉钒母液, 研究了外加FeSO₄·7H₂O、沉钒pH值、沉钒温度、沉钒时间对沉钒率和富钒渣质量的影响。最佳沉钒工艺条件为: 常温下, 不外加FeSO₄·7H₂O, 直接用碱调pH值至4.5后, 反应5 min, 此条件下, 沉钒率达到99%以上, 富钒渣中V₂O₅品位为16%。沉钒后得到的富钒渣中主要为Fe(OH)₃沉淀和少量Al(OH)₃沉淀, 钒吸附或夹杂在氢氧化物沉淀胶体的表面。富钒渣返回焙烧研究表明: 富钒渣的返回量占钒渣原矿的15%时, 可以促进钒的浸出, 且相较于提钒尾渣直接返回焙烧能减少渣的返回量, 降低设备负荷和能耗。

Preparation of Vanadium-rich Slag with Vanadium-extracted Tailings from Panzhihua

The leaching solution obtained after acid leaching of vanadium-extracted tailings from Panzhihua was taken as mother liquor for vanadium precipitation. Then the effect of addition of FeSO₄·7H₂O, pH value, temperature, precipitation time on vanadium precipitation rate and amount of precipitated vanadium-bearing residue was investigated.The vanadium precipitation rate can be up to over 99% and the content of vanadium in the vanadium-bearing residue reaches 16% under the following optimal conditions: 5-min reaching at a room temperature without adding FeSO₄·7H₂O, with a pH value of 4.5 by directly using alkali. The vanadium-bearing residue after precipitation was composed of large amount of Fe(OH)₃ and little Al(OH)₃, with vanadium adsorbed or mingled on the surface of precipitated hydroxide colloid. The experiment with vanadium-bearing residue returned to roasting process for vanadium extraction indicated that, compared to the process of vanadium-extracted tailings all directly returned to roasting process, the vanadium extraction rate could be enhanced with vanadium-bearing residue returned to roasting process accounting for 15% in raw ore of vanadium slag. It reduces the amount of residue returned to roasting process, thus reducing the equipment load and energy consumption.