Thermal analysis techniques applied to study corrosion mechanisms of SEN used in the steel continuous casting process

Journal of Thermal Analysis and Calorimetry - Recent advances in the technology of black refractories for steel continuous casting promote the development of materials that operate at extreme...     

Application of thermal analysis to the rhenium recovery process from copper and molybdenum sulphides minerals

Journal of Thermal Analysis and Calorimetry - Rhenium production from copper and molybdenum sulphides involves the use of a pyrometallurgical process. In traditional pyrometallurgy processes, gases...     

Study on fluoride evaporation from casting powders

Journal of Thermal Analysis and Calorimetry - Casting powders are commonly used in continuous casting of steels. The chemical composition of these powders is based on various oxides, carbonaceous...     

Decomposition kinetic of carbonaceous materials used in a mold flux design

Mold fluxes develop important functions during steel continuous casting process. To obtain a free-defect product the melting rate of mold flux is an important property to be controlled. The melting rate depends on the reactivity of carbonaceous material added to these powders as carbon source. In this article, the decomposition kinetic of two carbonaceous materials added to mold flux: petroleum coke and synthetic graphite, was analyzed. By measuring mass loss at different heating rates the decomposition reaction was determined on both types of materials. Applying several kinetic models of non-isothermal decomposition, the average activation energy E = 48 kJ/mol to mold powder with 15 wt% coke and E = 67 kJ/mol to one with 15 wt% graphite was determined. A first order of reaction (n = 1) associated to the decomposition process was assumed to both types of materials. The lower activation energy presented by mold powder-15 wt% petroleum coke indicated a higher reactivity of this material. A higher level of variation of E and n values with decomposition degree and temperature observed in the powder with petroleum coke was associated to a less thermally stable material along with a more complex degradation process.