| 摘要 |
A process for treating a raw steel industry slag, for converting same into a hydraulic binder at least equivalent to a Portland cement clinker, comprising: an oxidative treatment process with an oxygen or air supply, or their mixture at a pressure ranging from 1 to 15 bars, preferably from 5 and 10 bars, at a temperature ranging from 1,650° to 1,400° C., preferably ranging from 1,550° C. to 1,450° C., more preferably equal to 1,500° C., of a raw steel industry slag containing, based on the raw slag total weight, at least 45% in weight of CaO and less than 30% in weight of Fe2O3; and the addition, to such a slag, of a lime source supplemented, if necessary, with a silica source and/or an alumina source, the proportions of the lime source and, optionally, of the silica and/or alumina sources being selected such that the slag has, after conversion and at room temperature, a Fe2O3 rate of at least 13% in weight and a mineral composition comprising at least 40% in weight of the C3S mineralogical phase and more than 10% in weight, preferably at least 40% in weight, of calcium ferrite in the form of a C2F and/or C4AF mineral phase, based on the final treated slag total weight.
|
