Kinetic mechanism of Magnesium Production by Silicothermy in Argon Flowing

Publication date: Available online 3 September 2019Source: Thermochimica ActaAuthor(s): Yusi Che, Zhenhua Hao, Jinpeng Zhu, zhenhua Fu, Jilin He, Jianxun SongAbstractThe experiment of magnesium production was carried out by non-isothermal thermogravimetric analysis (TGA) technique under the conditions, where the reaction equilibrium was shifted by entraining the magnesium vapor into argon. The thermogravimetric (TG) of pellets made of calcined dolomite, ferrosilicon and fluorite were determined at the heating rate of 10, 15 20 and 25 ℃ min−1 in argon flowing and high temperature, respectively. Then on the basis of model-free and model-based analysis, the reaction kinetics were conducted. The results showed that the model that gave the best statistical fit of experimental data is two consecutives probably. When conversion α was less than 48.6%, the reaction mechanism was determined by the N-Dimensional nucleation and growth, otherwise, it was the Nth order formal chemical reaction. And the conversion rate of every step could be described by independent kinetic equation and kinetic parameters. Our research will lay the research basis for the development of a new non-vacuum magnesium metallurgy technology with a lower energy consumption and more efficient.
Source: Thermochimica Acta - Category: Chemistry Source Type: research