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Carbon anodes, used in the Hall-Héroult electrolysis process, are subject to an overconsumption caused by CO2 attack. Several attempts have been made to understand the mechanism of CO2 gasification based on the study of the reactivity of anode cores or anode constituents (coke, pitch and binder matrix). In this study, the specific surface area and the pore volume of carbon anode and of three coke/pitch...
The objective of the present work is to distinguish and quantify the role of porosity and external surface of particles in gasification of carbon anodes and to determine a critical pore size. For this purpose nine particle size ranges with an average diameter varying from 33 to 4380μm were reacted with CO2 at 960°C and the pore size distribution of the samples were determined. Pore volume classification...
Carbon anodes, used in Hall–Héroult electrolysis process, are subject to carboxy gasification. It is generally thought that the baked pitch of anode is more chemically reactive than coke and thus it preferentially reacts with CO 2 , resulting in premature disintegration of anode. In this study, the apparent reaction rates of anode and its constituents (coke, pitch and butt) were measured separately...
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