from the conferences organized by TANGER Ltd.
Approximately 1 billion tons of ash and slag waste are produced annually from coal-fired power plants worldwide, including 6,8 million tones in Ukraine. The total amount of accumulated ash and slag waste in Ukraine exceeds 380 million tones. Their accumulation creates serious environmental risks and economic problems. Many methods based on physical, chemical and combined approaches are known for ash and slag waste disposal. Most often these wastes are used in the production of building and road construction materials. However, ash and slag wastes contain significant amount of metal oxides that can be extracted to form alloys. The total content of Fe, Al and Si oxides in ash and slag waste can reach 60%. However, the instability of the chemical composition is a serious problem in their metallurgical processing. Traditionally, the metallurgical methods for processing these wastes are based on carbon reduction, which involves significant CO2 emissions to the environment. This approach is not in line with the current trend towards decarbonisation of industrial production. To find alternatives, the possibility of using the electrometallurgical smelting process with extraction of metals into an alloy in the recycling chain is being investigated using the ash and slag waste from Trypilska TPP. The aluminum waste is used as a metal oxide reducing agent. Laboratory experiments on the remelting of ash and slag waste by the method of reductive electroslag melting have shown the possibility of implementing a waste processing with the production of iron or aluminum-based alloys at the first stage of recycling.
Keywords: Ash and slag waste, electroslag smelting, aluminum reducing agent, ferrosilicoaluminum© This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.