Perfluorocarbon emissions from electrolytic reduction of rare earth metals in fluoride/oxide system
Perfluorocarbon emissions from electrolytic reduction of rare earth metals in fluoride/oxide system
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DOI：
10.1016/j.apr.2017.06.006
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发表时间：
2018
影响因子：
4.5
通讯作者：
Lizhi Zhang;Xiufeng Wang;Bin Gong
中科院分区：
文献类型：
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作者：
Lizhi Zhang;Xiufeng Wang;Bin Gong
全氟碳化物（PFC）是重要的温室气体。在铝电解工业中，PFC的排放已受到重视。稀土金属在碳阳极钨阴极氟化物/氧化物体系中的电解还原也有PFC排放。但稀土金属行业的PFC排放问题却较少受到关注。通过跟踪钕电解和镝铁合金电解烟气中CF 4浓度的变化，研究了电解过程中PFC的排放情况。结果表明，在电解过程中，CF 4存在连续的溢流现象。当阳极效应发生时，CF 4发生了爆发。阳极效应总是伴随着电解温度的降低。此外，由于电解镝铁合金需要较高的槽电压，PFC排放量也高于稀土电解。一般而言，稀土金属电解产生的PFC排放量与铝电解工业相当。
Perfluorocarbons (PFC) are important greenhouse gas. In the aluminum electrolysis industry, PFC emission had been valued. The electrolytic reduction of rare earth metals in fluoride/oxide system with carbon anode and tungsten cathode also has PFC emission. But the PFC emission in rare earth metals industry received less attention. The PFC emissions during the electrolysis were studied by tracking the change of CF4concentration in the flue gas of neodymium electrolysis and dysprosium-iron alloy electrolysis. The results showed that there were continuous CF4overflows in the electrolysis process. The CF4was outburst when anode effect occurred. The anode effect was always accompanied with the low electrolysis temperature. In addition, because of the electrolytic dysprosium-iron alloy requires higher cell voltage, the PFC emissions are higher than rare earth electrolysis. In general, PFC emissions from rare earth metal electrolysis are quite same as the aluminum electrolysis industry.