Method for treatment of dust recovered from offgasses in metallurgical processes

Abstract From the Canadian patent

Method of treating dust precipitated from waste gases from metalurgical processes, especially dust precipitated from waste gases in connection with production of steel in order, to transfer the dust to a form in which it can be deposited without danger of environmental pollution and from which the valuable components of the dust can be revovered. According to the method the dust is treated in the following steps:, a) continuous or approximately continuous supply of dust together with reducing agent and possible fluxes to a gastight covered electrothermic smelting furnace. b) smelting and selective reduction together with volatilization of volatile metals in the smelting furnace. c) …