Modernization of gas treatment equipment from pollutants in alumina production

Abstract

In this paper, it is the previous system of gas treatmenton sintering furnaces used at JSC “RUSAL Achinsk”, consisting of a dust chamber and electro filters, did not provide the necessary treatment degree. Old four-field electro filters were not effective and required constant replacement and adjustment of electrode systems and shaking mechanisms. Shown that the modernization of gas treatment equipment in alumina production reduces the emissions of polluted substances into the air. The introduction of technical solutions for modernization of obsolete and worn-out electric filters to more modern and efficient five-layer electro filters increases the degree of gas treatment from sintering furnaces from inorganic dust. The introduction of an additional stage of “wet” gas treatment on sintering furnaces in scrubbers has been confirmed by industrial tests, while ensuring high efficiency of gas treatment from fine-disperse dust. When using sub-sludge water as an irrigation liquid at the stage of “wet” gas treatment, it was not necessary to build additional treatment facilities, since the modernization project provides for its subsequent return to the hydrochemistry shop for technological needs.