PARTICULATE EMISSIONS FROM ELECTROLYSIS CELLS

摘要

In the dry cleaning of the exhaust gas from the aluminium cellsrnimpurities are accumulated in the finer fractions of secondaryrnalumina from the dry scrubbers. The present work describes newrnmethods for the determination of dust composition, aiming atrnincreasing the understanding of the effect of cell operation on thernamount and the composition of dust in the fume. New andrnadvanced analysis methods are used to characterize a broadrnspecter of emissions. An Electrical Low Pressure Impactor is usedrnto sample and analyze the dust from the cells. The equipmentrnenables real-time particle size distribution analysis of 12 particlernclasses in the range 30 nm - 10 μm. The size classified samplesrnare analyzed by means of SEM/EDS and XRD to determine therncharacteristic chemical composition of the different fractions.rnUnderstanding the evolution, evaporation, and condensation ofrnparticulates in the cell emissions under different operationalrnconditions may facilitate new standards for environmentalrnfriendly and energy efficient high amperage electrolysis cells.