HF Emission from Dubal`s Electrolysis Cell

The overall goal for this paper is to gain better understanding of the environmental aspect of the aluminium smelting cell. It encompasses a study of the relative contributions of operational practices, duct flow, alumina feeding and ambient conditions to the overall HF generation and the different categories of emission distribution between the recycle system, the pot room roof and the stack. DUBAL has examined the influence of humidity on HF emission during the summer period, when the ambient temperature was 20 to 45°C and humidity pH2O = 1 to 4 kPa. This study was undertaken separately in the cell duct and the pot room roof through continuous HF emission monitoring on different cell technologies, operating amperages and correlated to operating practices flow rate etc.

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