Patent ID: 9695485
Date: 2017-07-04
CPC Classifications: C04B,C21B,C21C,C22B,Y02P

Claim:
1. A method for processing steel slag to produce a hydraulic mineral binder with high hardening potential and to recover iron, comprising the steps: providing a feed product comprising steel slag with iron compounds and MnO, wherein the MnO may be contained in the steel slag, processing the feed product as melt, incorporating reducing agent into the melt to reduce the iron compounds in order to achieve a lime saturation factor in a mineral part of the melt between 90 and 110, wherein the incorporation of the reducing agent is carried out in a non-oxidizing atmosphere, slow cooling, wherein the melt solidifies in 15 minutes at the earliest, mechanical separation of elementary iron from the solidified melt, and subsequent supply of the solidified melt with a reduced iron content for use as hydraulic mineral binder.