Reuse of by-products from metallurgical processes

摘要

The present invention provides a method of treating contaminated slag 202 from a steelmaking process. The method comprises: separating the slag by particle size; subjecting at least part of the slag to attrition while it is in a flow of water; and magnetically separating 240 at least part of the slag that has been subjected to attrition. In particular the present invention may be used to treat slag produced during Basic Oxygen Steelmaking. Suitably, the method includes carrying out an air blowing separation step on the contaminated slag, for example in an air screen separator 236. The method may also comprise performing a flotation step 220 and/or an eddy current flotation step 248 on the contaminated slag. The step of separating the contaminated slag by particle size can comprise the use of a mesh screen 204. A rotatable shaft comprising an Archimedes screw and/or paddles may be utilised in the attrition step. The present invention may separate out reusable components of the contaminated slag.