Method for separating nonferrous metals from iron-...

Details Method for separating nonferrous metals from iron-... Method for separating nonferrous metals from iron-...

C - Chemistry, Metallurgy

22

B

53/354

C22B 7/02 (2006.01) C22B 1/08 (2006.01) C22B 1/10 (2006.01)

Patent

CA 1211292

ABSTRACT OF THE DISCLOSURE: There is described a method for separating nonferrous metals from iron-oxide-containing residues by thermal chlorination of the residues with elementary chlorine at an elevated temperature and cooling of the reaction gases with a sublimation of the sublimable chlorides formed. As starting material, converter dust from flue gases of the steel production or fine flue dust from blast furnaces is used. As reaction gas, technically pure chlorine gas in an excess of at least 2 : 1 relative to the stoichiometric amount necessary for the chlorination of the nonferrous metals to be separated, if desired mixed with inert gas, is used. The reaction temperature during the chlorination is maintained at between 600 and 800° C.

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