Technical actions for decrease in harmful effects on the surrounding environment from the rotating furnaces of agglomeration of JSC RUSAL Achinskare offered. Additional technical solution on tertiary treatment of flue gases of the furnace of agglomeration in a scrubber electric precipitators and the direction of purified gases on repartition of carbonization of the aluminous shop is developed. the providing decrease in harmful emissions in the atmosphere to the level of maximum-permissible concentration. The carried-out trial tests of the offered technology confirmed that except effective purification of flue gases of furnaces of agglomeration of inorganic dust and carbon dioxide the high extent of decomposition of alyuminatny solution necessary for technology of receiving alumina is provided.

The environmental problems of alumina production, caused by the formation of waste gas treatment plants are considered. The phase and chemical composition and microstructure of dust from gas treatment facilities of thermal power plants has been studied. It has been suggested to use gas-cleaning plant wastes as active mineral additives in road mixtures. The possibility of using electrofilter dust as a mineral powder for asphalt concrete has been experimentally verified. It has been established that the properties of asphalt concrete using the dust from gas cleaning facilities of heat-power equipment of alumina production are practically the same as those of asphalt concrete prepared on the crushed limestone rock of Mazul limestone mine.

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.

Methods of utilization of process dust by returning it to the rotary kiln are considered. To reduce the emission of fine dust of electrostatic precipitators into the atmosphere and to increase the efficiency of its utilization it was proposed to remove it from the furnace turnover, not to mix it with the dust of the dust chamber, and then to dispose of it according to a separate scheme. It has been established that the return to the correction pool of the raw materials workshop of JSC RUSAL Achinsk of fine technological dust caught in the 1st, 2nd and 3rd electric field of the sintering furnace electrofilters will reduce the consumption of limestone to 530 thousand tons per year, while improving the overall environmental situation at the industrial enterprise.

The installation of an additional stage of the "wet" waste gas purification unit at the alumina sintering furnaces ensured the achievement of a high degree of purification of gas emissions from fine impurities up to 96 % and the standards of maximum permissible emissions of solid pollutants into the atmosphere established for an industrial enterprise. The formed slude after gas cleaning is proposed to be sent for further processing to the hydrochemistry workshop, thereby ensuring its disposal without contamination of the natural environment. The analysis of air pollution indicators confirmed a decrease in emissions of solid pollutants in the atmospheric air of Achinsk.