METHOD FOR WORKING-UP WASTE SLAG FROM THE OXYGEN STEEL PRODUCTION

摘要

The invention relates to a method for working-up a waste slag from the oxygen steel production (L.D.-slag), comprising reducing metal oxides being present in the slag to metal by means of a reducing agent with the addition of an Al2O3-containing additive and separating these from the slag, said method being characterized in that the L.D.-slag is mixed beforehand with an additive (additives) at least containing the oxides of aluminium and silicon said additive(s) being used in a ratio of 45 - 2? parts of additive to 55 - 97? parts of L.D.-slag and with carbon as a reducing agent and the reduction substantially takes place in the solid phase, whereafter between about 1250.degree.C and 1500.degree.C the iron is separated from the newly formed slag and is subsequently removed and furthermore the invention relates to portland cemont clinker produced from raw materials obtained from L.D.-slag treated according to the above-described method.