Influence of Vanadium Slag Cooling Scheme on Particle Size of Vanadium Spinel and Sodium Roasting
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摘要: 对三种不同冷却方式得到的水冷钒渣、风冷钒渣和缓冷钒渣的物相结构、钒尖晶石颗粒大小进行了分析,考察了氮气气氛下1 000℃保温时间对钒尖晶石颗粒大小的影响,并对水冷钒渣、风冷钒渣和缓冷钒渣在相同条件下的钠化焙烧效果进行了比较。研究结果表明,缓冷和1 000℃保温有利于钒尖晶石颗粒长大;-0.125 mm钒渣在不添加提钒尾渣焙烧时,不同粒度范围的水冷钒渣焙烧钒转化率比同粒度范围的缓冷钒渣低1~2个百分点;-0.125 mm钒渣添加提钒尾渣焙烧时,水冷钒渣焙烧钒转化率比缓冷钒渣低0.56个百分点。Abstract: Phase structures and spinels’ particle size of water-cooled vanadium slag,air-cooled vanadium slag and slowly cooled vanadium slag are analyzed,and the effect of holding time at 1 000 ℃ under nitrogen atmosphere on particle size of the vanadium spinel is studied.In addition,comparisons of sodium roasting of water-cooled vanadium slag,air-cooled vanadium slag and slowly cooled vanadium slag under the same conditions are made.According to the research,slow cooling and holding at 1 000 ℃ benefits the growth of vanadium spinel particles;for the vanadium slag of-0.125 mm roasted without vanadium extraction tailings,the conversion rate of water-cooled vanadium slag at different size range is 1%~2% lower than that of slowly cooled vanadium slag at the same size range;for the vanadium slag of-0.125 mm roasted with vanadium extraction tailings,the conversion rate of water-cooled vanadium slag is 0.56% lower than that of slowly cooled vanadium.
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Key words:
- vanadium slag /
- cooling scheme /
- vanadium spinel /
- roasting effect /
- particle size
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