QSL Queneau-Schumann-Lurgi


QSL Queneau-Schumann-Lurgi : A submerged smelting process for extracting lead from its ores and secondary sources. Pellets of sulfide ore concentrate are fed into a bath of molten slag held in a rotating cylindrical furnace. Oxygen is fed into the bath below the surface of the slag, forming sulfur dioxide and generating heat. Powdered coal is added further along the pool, reducing the lead oxide to metal
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