| 主权项 |
1. 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, in particular in oxide form, and MnO, whereby the MnO may be contained in the steel slag, processing the feed product as melt in a furnace, incorporating reducing agents into the melt to reduce the iron compounds in order to achieve a lime saturation factor in the mineral melt part of between 90 and 110, wherein the incorporation of the reducing agent is carried out in a non-oxidising furnace atmosphere, defined cooling, wherein the melt solidifies in 15 minutes at the latest, mechanical separation of at least part of the elemental iron from the solidified melt, and subsequent direct supply of the solidified melt with a reduced iron content and an alite content of at least 40 wt. % with a content of crystalline phases of at least 60 wt. % for use as hydraulic mineral binder. |
