Novel applications of microwaves in the metallurgical processing of a nickel-ferrous laterite ore and an aluminum industry waste

3rd International Conference on Competitive Materials and Technology Processes

Samouhos, M.^1 ; Taxiarchou, M.^1 ; Kouvelos, E.^2

Laboratory of Metallurgy, School of Mining and Metallurgical Engineering, National Technical University of Athens, Zografou Campus, Athens, Greece^1

Demokritos National Center of Scientific Research, Agia Paraskevi, Athens, Attiki, Greece^2

关键词: Aluminum industry;    Gaseous products;    Metallurgical processing;    Nano-structured;    Novel applications;    Pyro-metallurgical process;    Reduction degree;    Spectroscopic technique;   

Others  :  https://iopscience.iop.org/article/10.1088/1757-899X/123/1/012049/pdf
DOI  :  10.1088/1757-899X/123/1/012049

来源: IOP

【 摘 要 】

Microwave radiation is a relatively new source of energy in the pyrometallurgical process. In this study, the application of microwaves in the carbothermic reductive roasting of a nickeliferous hematitic laterite ore and a red mud are investigated. The effective microwave heating (at temperatures above 900°C) of the aforementioned materials is attainable due to the relatively high values of their imaginary permittivity ()- In both two cases, the reduction of the included hematite was attempted, and the reduction degree was calculated as a function of: (a) the heating time and (b) the supplied microwave power. The mechanism of Fe+3 to Fe0 conversion was investigated using Mössbaurer spectroscopy revealing the formation of magnetite, fayalite and nano-structured metallic iron. Finally, it should be noted that that the gaseous products of the microwave pyrometallurgical process were analyzed using a mass spectroscopic technique, which is an important novelty.