| 摘要 |
1,156,063. Recovering HCl from pickling liquors. METALLGESELLSCHAFT A.G. 10 March, 1967 [11 March, 1966], No. 11445/67. Addition to 1,078,769. Heading C1A. The process of the parent Specification 1,078,769 in which pickling acid is withdrawn at a rate which corresponds to the loss of iron from articles being treated in a bath, the acid is concentrated by evaporation in a direct heat exchange with hot gases in a tower almost to the saturation limit of the salts dissolved in the acid, and heated in a kiln at least to the temperature which is required for decomposing FeCi 2 , the heating in the kiln being effected in a fluidized bed, which consists of an inert material and into which the heat required for decomposition is introduced by injecting on introducing fluid fuel and a free oxygencontaining fluidizing gas, the resulting metal oxides are removed from the gases and the HCI in the gases is absorbed after removal of dust is modified in that concentration of the acid by evaporation is effected by heat exchange with hot gases from a kiln in a contact apparatus, into which aqueous liquid is introduced to achieve temperature control. |
