Method of treating steel works slag and steel works slag prepared in such a manner

摘要

The present invention relates to a steel works slag treatment method comprising: injection of oxygen or a mixture of gases containing gaseous oxygen into the liquid steel works slag; adding and dissolving in the agitated liquid steel works slag aluminium oxide and calcium oxide sources, and optionally silica and iron sources and cooling the slag until solidification; the additions of aluminium oxide and calcium oxide sources and optionally silica and iron sources being carried out in such amounts and the cooling being performed at such speed that the resulting slag has a mineralogical composition having one of the following constituting element: (a) an amorphous glassy phase; (b) a first group of phases (1) consisting of 10 to 40 percent by weight of CA, 20 to 50 percent by weight of Ci2AS, 30 to 50 percent by weight of Ci6AFi2 and 10 to 30 percent by weight of Ci2S; (c) a second group of phases (2) consisting of 20 to 40 percent by weight of Ci2F, 10 to 30 percent by weight of Ci2AS, 20 to 50 percent by weight of Ci6AFi2 and 10 to 40 percent by weight of Ci2S; and (d) a mixture of amorphous glassy phase and of the first or second group of phases. The invention also relates to the steel works slag prepared in the above-described manner.