| 摘要 |
<p>1. A method for separating nonferrous metals from ironoxide-containing residues by chlorination of the residues by means of elementary chlorine at an elevated temperature and cooling of the reaction gases with the sublimation of the sublimable chloride formed, characterized by the combination of the following measures : a) that converter dust from flue gases of the steel production or fine flue dust from blast furnaces is used as starting material ; b) that the 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 as reaction gas ; c) that the reaction temperature during chlorination is maintained at between 600 and 800 degress C, wherein, for the separation of nonferrous metals that do not form sublimable chlorides, such as calcium and magnesium, either the starting material is processed by treatment with acid, the solution obtained is separated and the residue is dried before being supplied to chlorination, or the starting material residues occuring after chlorination and separation of the sublimate are slurried in water and the slurry is filtered.</p> |
