Vanadium Extraction from Carbonaceous Stone Coal by Calcination with Biomass
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摘要: 以湖北地区含钒量较低的碳质石煤为原料,研究石煤与生物质及添加剂混合共焙烧过程中五价钒的转化率,确定合理的焙烧参数。结果发现:生物质的添加对石煤的脱碳和焙烧过程起促进作用,石煤与生物质7:3混合在850℃的温度下焙烧取得最佳反应效果;加入4%的复合添加剂后(其中w((Na2CO3)):w((CaCO3))=6:4),在950℃温度下焙烧2 h后,熟样中钒的转化率最高,五价钒的转化率为60%。Abstract: The conversion rate of pentavalent vanadium in the calcination process of stone coal with biomass and additives was investigated to determine favourable parameters using Hubei carbonaceous stone coal with low vanadium concentration as raw material.It is found that the addition of biomass enhances the decarburization and roasting processes of the stone coal and the optimal reaction efficiency can be obtained by calcination at 850℃ with ratio of stone coal to biomass 7:3. Adding 4% composite additives(w(Na2CO3):w(CaCO3)=6:4) and roasting at 950℃ for 2 h,the conversion rate of vanadium in the clinker reaches the highest value with 60% of conversion rate for pentavalent vanadium.
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Key words:
- carbonaceous stone coal /
- vanadium /
- conversion rate /
- biomass /
- composite additives /
- roasting
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