ABSTRACT
Fines particles of material treated in furnaces are partially carried out of the unit in the exit gas. For example the blast furnace gas may contain up to 170 kg of dust per ton of pig iron produced. This dust must be captured for two reasons: to recover its valuable metal content and to prevent pollution of the environment. Solid-gas separating equipment is more efficient than the previous type and occupies less space. The dust-laden gas enters a cylindrical or conical chamber tangentially. Bag filters are not suitable for handling hot gases containing excessive moisture, for example, blast furnace gas because: The fabrics usually disintegrate at high temperature and if water condenses on the cloth, a deposit is formed that is difficult to remove. Dust separation in this equipment is based on the fact that if the solid particles carried in a gas are given an electrical charge, they will be attracted to a collection device carrying the opposite charge.
