Patent ID: 6500229
Filing Date: 2002-12-31
Classification: B03B,C22B,C25C,Y02P,Y10S

Abstract:
A method of treating steelworks dust with a view to retrieval of the recoverable elements, said method comprising an attrition in water (2) to obtain a charge followed by a water grading (6) of the charge (5) thus obtained wherein an overflow (10) issues from said water grading, said method being characterized in that it also comprises:washing (11) of a charge collected at the overflow (10) issuing from the water grading (6), said charge being charged with dissolved heavy metals and salts, with a view to separating water-soluble saline fractions from insoluble oxides, treating under heat (16) of the whole of the charge, washed in the previous washing step (11) without prior magnetic separation, with a view to eliminating the metals in the form of free oxides, treating by thermal means (20) of a charge (17) obtained after treatment under heat (16) at a temperature between 240 and 800Â° C.