Anode butt cores: Physical characterization and reactivity measurements

Characterization of carbon anode constituents under CO 2 gasification: A try to understand the dusting phenomenon

“…Oliveira [27] validated the chemical regime by TGA for coke particles (from 0.2 to 1.0 mm) and coke slices (thickness: 2.5 mm) at a temperature range of 800-1100°C and a CO 2 gas flow between 100 and 450 ml/min at atmospheric pressure. Suriyapraphadilok et al [19] have found that an initial sample size of 9-11 mg of butt particles is necessary to allow the elimination of the mass transport effects in TGA; other conditions being: particle size smaller than 200 US Mesh (74 lm), 100 ml/min of CO 2 and temperature of 976°C. The first step in this work was thus to choose the appropriate conditions under which the chemical regime can be achieved for raw materials used for anode manufacturing.…”

“…Furthermore, considering the size of the coke and anode samples as well as the temperature of the reaction (at least 960°C), a gas concentration gradient could be created inside the samples [7,19,20]. Thus, the CO 2 reactivity of these samples could be affected by two main parameters: the chemical reactivity, influenced by the level of impurities and L C , and the mass transport limitations, influenced by the gas concentration gradient.…”