One of the most important wastes in iron metallurgy is the blast furnace sludge. This sludge consists of fine particles of iron ore, coke and fine particles of flux. The furnace sludge is characterized by the chemical composition similar to that of the furnace load, the major difference being the concentration of zinc and lead. Due to the similarity with the blast furnace load, this material, after pelletization, can be recycled in the technological process. However, this recirculation is limited by the zinc content, which significantly disrupts the operation of the furnace. This paper presents tests to reduce the zinc content of the furnace sludge by hydrometallurgical and pyrometalurgical processes.
Metallurgical slag is one of the most common industrial wastes. Many of these wastes are not stable over time, by reacting with water and air, continuously generating emissions of heavy metals. Metallurgical slag processing is necessary for at least two reasons: reducing pollutant emissions and broadening the raw material base. The recovery of these slags is very difficult because they are the result of metallurgical processes that aimed to fix metals considered impurities in chemical matrices as stable as possible. This paper presents the initial research on the behavior of metallurgical slags against different leaching technologies.
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