Measures to Prevent Baked Anode Density Drop When Using High Porosity Cokes
In the last years, coke quality has been deteriorating throughout the world. One of the most affected properties is the coke porosity, commonly measured by the Vibrated Bulk Density (VBD). It is well known that the drop in VBD has a direct impact in the Baked Anode properties, especially Baked Apparent Density (BAD). This paper describes some measures taken at Alumar Smelter that enabled the BAD to be kept constant when using low VBD cokes.
A complete analysis of the system was carried out and several aspects were considered as potential for improving density. The most significant being the changes made in the fines fraction and optimization of mixing and forming. Whenever applicable, anode properties were compared before and after the changes, in order to estimate each action impact.
KeywordsCarbon Anode Coke Density VBD BAD
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