Influence of Residue Recycle on Sodium Roasting of Vanadium Slag
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摘要: 以钒渣和弃渣为原料，碳酸钠和氯化钠为钠化剂，进行焙烧试验。不仅降低钒资源的损失，而且能减轻环境污染。通过硫酸亚铁铵滴定法，考察了焙烧温度、保温时间、碱比、碱盐比对不同钒含量样品钒浸出率的影响。结果表明：钒渣中适量的弃渣加入能促进钒转化率的提高；弃渣掺杂量16.376%时，最佳煅烧温度为800℃，保温时间为60 min，碱比1.5，碱盐比3.5，钒浸出率98.43%。Abstract: The roasting experiments were carried out with vanadium slag and the residue after vanadium extraction as raw materials,sodium carbonate and sodium chloride as sodium reagents,which aims to reduce the loss of vanadium resources and alleviate the environmental pollution.The effects of roasting temperature,holding time,alkali ratio and alkali-salt ratio on leaching rate of vanadium for samples with different vanadium contents were investigated by ammonium ferrous sulfate titration.The results show that proper addition of the residue can promote the conversion of vanadium.When the content of residue is 16.376%,the optimum calcination temperature is 800 ℃,holding time is 60 min,alkali ratio is 1.5 and alkali-salt ratio is 3.5,the leaching rate of vanadium reaches 98.43%.
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Key words:
- vanadium extraction /
- vanadium slag /
- residue /
- sodium roasting /
- leaching rate
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