Bogoslovsk Aluminium Smelter (BAS)

The construction of the facility started in 1941, and in 1945, it produced its first aluminium. The BAZ alumina complex was designed to process highly carbonised bauxite from the North Urals Bauxite Mine (SUBR), located 37 kilometers from BAZ.

In 2012–2013, the aluminium production line at BAZ was mothballed as part of the Metals Segment's initiative to close inefficient facilities.

Alumina is now the main product that BAZ supplies to the Company's aluminium smelters.

The refinery produces alumina using a technique that combines the Bayer and sintering processes.

The productivity of the Bayer branch has been improved by reconstructing its red mud separation units. This involved installing single-deck thickeners and the washers that use synthetic flocculants; re-equipping the piston pump fleet with GEHO and FELUWA units; improving the raw bauxite slurry heaters; and equipping the Precipitation-1 floor with new precipitators.

The productivity of the sintering branch was improved by reducing the moisture content of the bauxite-soda-limestone mixture fed to the sintering furnace.The construction of a new OPTsU-1000 swirl calcination furnace was completed in 2024.

Development plans

Between 2025 and 2035, the refinery plans to renovate the dust and gas treatment equipment, specifically the electrostatic filters, in its rotary sintering and calcination kilns. This will reduce emissions and losses of alumina and alkali to prevent the risk of production capacity loss and negative impact on the environment.

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