PARTICULATE EMISSIONS FROM ELECTROLYSIS CELLS

摘要

In the dry cleaning of the exhaust gas from the aluminium cellsimpurities are accumulated in the finer fractions of secondaryalumina from the dry scrubbers. The present work describes newmethods for the determination of dust composition, aiming atincreasing the understanding of the effect of cell operation on theamount and the composition of dust in the fume. New andadvanced analysis methods are used to characterize a broadspecter of emissions. An Electrical Low Pressure Impactor is usedto sample and analyze the dust from the cells. The equipmentenables real-time particle size distribution analysis of 12 particleclasses in the range 30 nm - 10 μm. The size classified samplesare analyzed by means of SEM/EDS and XRD to determine thecharacteristic chemical composition of the different fractions.Understanding the evolution, evaporation, and condensation ofparticulates in the cell emissions under different operationalconditions may facilitate new standards for environmentalfriendly and energy efficient high amperage electrolysis cells.