Dry scrubbing for modern pre-bake cells

Abstract

The two fundamental "raw materials" for pot room gas treatment systems are alumina, and process off-gases. Modern dry scrubbing systems offer very efficient removal technology. However, increases in the kilograms per ton of fluoride evolution from reduction cells and increases in fume evacuation rates can challenge the abilities of existing dry scrubbers. This is especially so if the goal is to provide both state of the art removal efficiency and alumina at the pot that is low in fines content. In this paper the authors discuss trends in our industry and propose solutions that include more efficient utilization of alumina and process gas flow to meet emerging needs.