Vanadium emission during roasting of vanadium-bearing stone coal in chlorine
Vanadium emission during roasting of vanadium-bearing stone coal in chlorine
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DOI：
10.1016/j.mineng.2012.02.003
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发表时间：
2012-04
影响因子：
4.8
通讯作者：
Yi-min Zhang;Yangjia Hu;Shenxu Bao
中科院分区：
文献类型：
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作者：
Yi-min Zhang;Yangjia Hu;Shenxu Bao
研究了含钒石煤在不同温度下氯化焙烧的特性。氯化焙烧可促进石煤中主要含钒矿物白云母和伊利石结构的破坏，在1000°C下焙烧1h，钒损失率达90%以上。管内收集的挥发物主要由氯、钒等金属组成，其物理化学性质与氧化钒（VOCl 3）相似。因此，可以合理地预测在该过程中钒以VOCl 3的形式排放。随着温度的升高，硬石膏逐渐分解，样品中的赤铁矿与氯反应，并在700°C以上消失。在氯化焙烧过程中，出现了堇青石、角闪石等新的耐火矿物相。易熔矿物的减少和难熔矿物的形成，使石煤的灰熔融温度升高，烧结困难。
The characteristics of the vanadium-bearing stone coal during chlorination roasting at different temperature were investigated. Chlorination roasting could promote the breakage of the structure of the main vanadium-bearing minerals, such as muscovite and illite, in the stone coal and more than 90% of the vanadium was lost after the sample was roasted in chlorine at 1000°C for 1h. The volatile collected on the inner surface of the tube is mainly composed of chlorine, vanadium and other metals and it shows similar physical and chemical properties to vanadium oxytrichloride (VOCl3). Hence, it is reasonable to predict that the vanadium was emitted as VOCl3in this process. The anhydrite gradually decomposed with the increasing temperature and the hematite in the samples reacted with the chlorine and disappeared above 700°C. Some new refractory mineral phases such as cordierite and hornblende can be found during the chlorination roasting. The decrease in the fluxing minerals and the formation of the refractory minerals can elevate the ash-fusion temperature of the stone coal and make it hard to sinter.