|About this Abstract
||2017 TMS Annual Meeting & Exhibition
||Magnesium Technology 2017
||Thermal Decomposition Kinetics of Pre-prepared Pellets for the Novel Silicothermic Process
||Lukui Guan, Zhang Ting'an, Zhihe Dou, Daxue Fu, Ming Wen
|On-Site Speaker (Planned)
A novel silicothermic process was put forward in order to solve the problems in Pidgeon process, including a loss of five percent fine powder produced during the calcination of dolomite and the easily deliquescence for calcined dolomite. For this method, pre-prepared pellets, which consist dolomite, ferrosilicon, fluorite and binder, are prefabricated before calcination, and then the calcined pellets are used directly for magnesium production. The difference of decomposition behavior and thermal decomposition kinetics between pre-prepared pellets and pure dolomite have been studied by thermogravimetry (TG) and differential thermal analysis (DTA) under non-isothermal conditions at different heating rates (4, 8, 16, and 30K/min). The thermal decomposition data were analyzed using some isoconversional methods. The decomposition temperature of pre-prepared pellets was lower than pure dolomite due to the higher thermal conductivity of ferrosilicon. The activity energy of decomposition of dolomite in pre-prepared pellets was lower than pure dolomite.