摘要:
以碳酸钠为添加剂, 对钒渣进行钠化焙烧试验研究, 通过XRD半定量法检测产物中钒酸钠的质量含量, 研究影响钒酸钠生成的因素, 并通过SEM、TG等辅助方法对钒渣在碳酸钠存在下焙烧过程中的物相变化及相应温度进行研究。结果表明, 钒渣在钠化焙烧过程中发生复杂的反应, 主要包括橄榄石、尖晶石的氧化分解, 以及钒酸盐、铬酸盐、硅酸盐、钛酸钠、铝酸钠、铁酸钠等的形成。产物中钒酸钠的质量分数随着V2O5、Na2CO3含量的增加而增加, 在试验条件下, 最优的反应温度是730℃, 最优的反应时间是80 min, 此时钒酸钠 (Na4V2O7) 在含钒物相中的含量可达98.09%, 其它含钒物相主要是CrVO3、CrVO4以及FeVO4。
关键词:
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钒渣 /
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钠化焙烧 /
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碳酸钠 /
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钒酸钠
Abstract:
Using sodium carbonate as additive,experimental studies of oxidation roasting of vanadium slag were conducted.The content of sodium vanadate was detected through XRD semi quantitative method and the factors influencing the formation of sodium vanadate were investigated.The phase transitions and their corresponding temperatures of vanadium slag during the roasting process with sodium carbonate（Na2CO3） presence were studied by some assistant methods （e.g.SEM and TG）.Experimental results show that the oxidation roasting process mainly consists of the decomposition of olivine and spinel phases,as well as the formation of vanadates,chromates,silicates,sodium titanate,sodium aluminate and sodium ferrite.The mass fraction of sodium vanadate in products increases with the increase of V2O5 and Na2CO3 content with 730 ℃ of the optimal reaction temperature and 80 min of optimal reaction time when the content of sodium vanadate （Na4V2O7） in vanadium phases is up to 98.09% and other vanadium phases are mainly CrVO3 and CrVO4 and FeVO4.
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