Method for treating slag
Assigneevoestalpine Stahl GmbH
InventorHerbert Schmid
Life of this patent
Estimating the term…
Abstract
A method for treating converter slag for the purpose of recirculating iron, wherein a converter slag is brought into contact with oxygen in such a way that by means of turbulence, the slag is mixed, the iron and iron oxide components that are present are oxidized, and the slag is then allowed to stand in the vessel or a vessel until a segregation into a solidifying, silicate and phosphorus-rich first fraction and an underlying liquid iron oxide-rich second fraction has taken place, with the converter slag that is used being mixed with a partial flow from the iron oxide-rich second fraction in such a way that the total FeO content of the slag that is to be treated with oxygen is over 35% by weight, thus enabling the segregation into two fractions.
Claims6
A method for treating converter slag for the purpose of recirculating iron, the method comprising the steps of:
- a) contacting a converter slag with oxygen in such a way that by means of turbulence, the converter slag is mixed, and iron and iron oxide components that are present are oxidized;
- b) resting the converter slag such that it is allowed to stand until a segregation into a solidifying, silicate- and phosphorous-containing first fraction and an underlying liquid iron oxide-containing second fraction has taken place;
- c) measuring an FeO content and an iron content of a first liquid melt of the converter slag before step a) and measuring the iron content of the second fraction as a second liquid melt generated after steps a) and b);
- and
- d) after step c), calculating and mixing a ratio of the first liquid melt and the second liquid melt to give a mixed liquid melt such that after the mixing, an FeO content of over 35% by weight of the mixed liquid melt is achieved.
Dependencies are inferred from the claim text.