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Defluorination Study of Spent Carbon Cathode by Microwave High-temperature Roasting by Zhi Zhu; Lei Xu; Zhaohui Han; Jianhua Liu; Libo Zhang; Chuxuan Yang; Zhangbiao Xu; Peng Liu is a Environmental Science article available to read on EtoBox.

What is Defluorination Study of Spent Carbon Cathode by Microwave High-temperature Roasting about?

Spent carbon cathode (SCC) produced in the process of aluminum electrolysis is a typical toxic and hazardous solid waste. Therefore, the harmless treatment of SCC is extremely important for the green development of aluminum electrolysis industry. In this paper, the microwave-assisted high-temperature roasting technology was developed to remove fluorides in SCC for recycling of this cathode. The melting point, dielectric parameter, crystalline structure, surface chemical property, elemental composition, morphological structure, carbon graphitization and surface area were characterized using thermogravimetric analysis and differential scanning calorimetry, high-temperature composite conductivity analyzer, X-ray diffraction, X-ray fluorescence, X-ray photoelectron spectroscopy, scanning electronic microscopy, transmission electron microscopy, Raman spectroscopy and isothermal N 2 adsorption-desorption method. The content of fluorides in raw and treated SCC was measured by ion activity meter. The results showed that the phase of sodium fluoride and cryolite would transform from solid to liquid when the temperature was higher than 1098.5 • C, and the SCC exhibited good performance on wa

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Author

Zhi Zhu; Lei Xu; Zhaohui Han; Jianhua Liu; Libo Zhang; Chuxuan Yang; Zhangbiao Xu; Peng Liu

Publisher

Elsevier BV

Published

2021

Language

EN

Field

Environmental Science (Physical Sciences)