FIELD: construction materials industry; methods of processing of steel-casting slag for production of construction materials.
SUBSTANCE: the invention is pertaining to methods of processing of steel-casting slag and may be used in production of construction materials. The method of treatment of the source steel-casting slag includes an oxidative treatment with feeding of oxygen or air, or their mixture under pressure within the limits from 1 up to 15 bar, predominantly from 5 up to 10 bar at the temperature within the limits from 1650 to 1400°C, predominantly from 1550 to 1450°C. The method provides, that the source steel-casting slag contains at least 45 % - CaO and less of 30 %-Fe2O3 from the total mass of the source slag, addition to the slag of a source of lime added if necessary with a source of silicon oxide and-or a source of aluminum oxide. Amounts of the source of lime and possibly sources of silicon oxide and-or aluminum oxide select so, that the slag after transformation and at the room temperature had contents of Fe2O3 - at least 13 mass % and a mineral composition including (counting upon total mass of the treated final slag), at least of 40 % of mineralogical phase - C3S and exceeding 10 %, but preferably - at least of 40 % of calcium ferrites in the form of the mineralogical phase C2F and-or C4AF. The technical result is transformation of the slag into a hydraulic binding, which is, at least, an equivalent to a portland-cement clinker.
EFFECT: the invention ensures transformation of the slag into a hydraulic binding - an equivalent to a portland-cement clinker.
12 cl, 2 dwg, 7 tbl, 27 ex
