Process for the production of hydraulic binders and/or alloys, such as for examples, ferrochromium or ferrovanadium

A method of refining basic steel slag containing chromium and/or vanadium to produce at least one of hydraulic binders, crude steel, and alloys from basic steel slags comprising:

• mixing said basic steel slag in liquid form with one or more additives selected from the group consisting of blast furnace slag, electric arc furnace slag, dusts from steel production, metallic waste substances, refuse incineration residues, and acid additives for lowering viscosity and forming a slag mixture;
• removing sedimented steel that results from said mixing step as a first product;
• reducing said slag mixture in a first reduction stage with a first reducing agent so that an iron oxide content of greater than 1 wt % but less than 5 wt % remains in the slag mixture and removing metallic iron that is formed as a second product;
• further reducing said slag mixture, absent said metallic iron, in a second reduction step with a second reducing agent, said second reducing agent in said second reduction step having a higher reduction potential than said first reducing agent, and forming metallic Cr or metallic V or ferroalloys thereof as a third product;
• separating a hydraulically active slag;
• and
• working up the hydraulically active slag to a hydraulic binder as a fourth product.

A process for recovering products from basic steel slag comprising:

• mixing basic steel slag in liquid form containing at least one member selected from chromium and vanadium with an additive selected from the group consisting of blast furnace slag, electric arc furnace slag, dusts from steel production, metallic waste substances, refuse incineration residues, and acid additives for lowering viscosity and thereby forming a slag mixture and a sediment of steel;
• removing said sediment of steel;
• reducing said slag mixture over an iron bath to produce a slag mixture having an iron oxide content of above 1 wt % and below 5 wt % while maintaining said chromium and/or vanadium in said slag mixture and forming a metallic iron;
• removing said metallic iron;
• reducing said slag mixture further to produce metallic Cr or metallic V or ferroalloys thereof;
• removing said metallic Cr or metallic V or ferroalloys thereof;
• wherein a remaining hydraulic slag is recovered.

A process for the production of at least one member selected form the group consisting of hydraulic binders, crude steel, and alloys from basic steel slags containing at least one member selected from chromium and vanadium, said process comprising the steps of:

• mixing a basic steel slag with at least one additive selected from the group consisting of blast furnace slag, electric arc furnace slag, dusts from steel production, metallic waste substances, refuse incineration residues, and acid additives for lowering the viscosity and forming a slag mixture,
• affecting sedimentation of crude steel out of the slag mixture;
• reducing the slag mixture that is remaining in a first reduction stage, with a first reducing agent comprising an iron bath and optionally one or more additives selected from the group consisting of coke, coal and synthesis gas so that an iron oxide content of greater than 1 and less than 5 wt % remains in the slag mixture and removing a metallic iron that is formed,
• further reducing the slag mixture that is remaining, with a second reducing agent which has a higher reduction potential as compared to said first reducing agent, said second reducing agent being one or more members selected from the group consisting of calcium, aluminum, silicon and iron, in a second reduction stage and removing a metallic Cr or a metallic V or ferroalloys thereof that are formed,
• separating a hydraulically active slag;
• and
• working up the hydraulically active slag to a hydraulic binder.