The newly developed systems for gas removal from the reduction of cells increases the gas removal efficiency in terms of the key contaminant – fluorine compounds (F, fluorides) to 97.5% and reduces emissions by 3.5 times, thus bringing the environmental efficiency of the Eco-Soderberg technology to baked anode technologies, stresses Rusal. Moreover, the dry and wet gas-cleaning complex allows for capturing both fluorides and sulphur (SO2). The company points up that only a few plants worldwide have installed this kind of integrated gas cleaning system with an fluoride capture efficiency of more than 99% and an SO2 capture efficiency of at least 96.5%. The project is a milestone of the environmental protection programmes being implemented at the aluminium smelters of Rusal.
About 70% of capacity of Krasnoyarsk Aluminium Smelter has already been switched to the Eco-Soderberg technology. The Bratsk Aluminium Smelter has switched about 70% of one of its potrooms to the Eco-Soderberg technology, and two series of potrooms feature a cutting-edge gas cleaning system. Pilot task areas each consisting of six new reduction cells have been launched at the Irkutsk and Novokuznetsk Aluminium Smelters. Plans are in place to expand the technology to cover the entire smelter of IrkAZ after the technology is developed, and the modernization at NkAZ has already started in two potrooms.
Vladislav Soloviev, CEO of Rusal, commented: “Implementing the Eco-Soderberg technology is among the key projects underway to eco-upgrade Rusal’s facilities, which would allow to reduce emissions as well as increase production efficiency in general. Developing and implementing green technologies is an essential requirement for maintaining a leadership position in today’s aluminium industry. By growing in this area, Rusal not only develops new technologies and products, but also promotes Russia’s scientific expertise on a global scale.”
Eco-Soderberg is a proprietary technology developed by Rusal’s Engineering and Technology Centre based in Krasnoyarsk. It is included in the ‘Guide to the Best Available Technologies in Aluminium Production’ approved by the order of Rosstandart.