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Electrolytic Preparation of Zirconium Metal from a Consumable Zirconium Oxycarbide Anode
Metallurgical and Materials Transactions B ( IF 2.4 ) Pub Date : 2021-07-01 , DOI: 10.1007/s11663-021-02255-x
Shaolong Li , Yusi Che , Jianxun Song , Yongchun Shu , Baoqiang Xu , Jilin He , Bin Yang

A single-phase zirconium oxycarbide was successfully synthesized by carbothermal reduction route at 1600 °C for 8 hours under argon atmosphere using ZrO2 and graphite powder as raw materials (the molar ratio of ZrO2 to graphite is 1:2.6). Effects of temperature, reaction time and molar ratio of ZrO2 to graphite on zirconium oxycarbide preparation were also investigated. The microstructure and composition of the products were characterized by X-ray diffraction, scanning electron microscopy, energy spectroscopy X-ray and ONH analyzer. The hot-pressed single-phase zirconium oxycarbide has good stability in molten NaCl–KCl. Subsequently, anodic dissolution of zirconium oxycarbide and the reduction mechanism of the dissolved zirconium ion in molten NaCl–KCl were investigated by a series of electrochemical technologies. The results show that the zirconium ion species dissolved in molten NaCl–KCl is Zr(II). Zr(II) is transferred from the anode to the cathode in the molten salt and is reduced to zirconium metal. Potentiostatic electrolysis at − 2.9 V was carried out using ZrCxOy as anode. CO gas was detected in the exhaust gas during the electrolysis, which can be explained as the combination of C and O atoms in ZrCxOy. The cathode deposit was detected to be zirconium metal. The results show that zirconium oxycarbide was a suitable anode material for the electrolytic synthesis of zirconium metal.



中文翻译:

从消耗性碳氧化锆阳极电解制备金属锆

单相碳氧化锆已经成功地由碳热还原途径在1600合成℃下进行8小时的ZrO使用氩气气氛下2和石墨粉末为原料的(ZrO的摩尔比2至石墨为1:2.6)。温度、反应时间和ZrO 2摩尔比的影响对石墨对碳氧化锆制备的影响也进行了研究。通过X射线衍射、扫描电镜、能谱X射线和ONH分析仪对产物的微观结构和组成进行表征。热压单相碳氧化锆在熔融 NaCl-KCl 中具有良好的稳定性。随后,通过一系列电化学技术研究了碳氧化锆的阳极溶解和溶解的锆离子在熔融 NaCl-KCl 中的还原机理。结果表明,溶解在熔融 NaCl-KCl 中的锆离子物质是 Zr(II)。Zr(II) 在熔盐中从阳极转移到阴极并被还原成锆金属。使用 ZrC x O y在 − 2.9 V 下进行恒电位电解作为阳极。电解过程中在废气中检测到CO气体,这可以解释为ZrC x O y中C和O原子的组合。检测到阴极沉积物是锆金属。结果表明,碳氧化锆是一种适合电解合成金属锆的负极材料。

更新日期:2021-07-02
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