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AssigneePelt & Hooykass B.V.
InventorCarel W. J. Hooykaas
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The invention relates to a method for preparing a hydraulically settable cement base material starting from steel slags formed in a steel-making process, which method comprises the formation, in steel slags in the liquid state, of a ferrite gradient by adding a ferrite-precipitating compound, the separation, if required, of the high-ferrite fraction formed, the separation of at least the low-ferrite fraction formed, the cooling and the comminution thereof to obtain a hydraulically settable material. The ferrite-precipitating compound used has preferably acid components, and can expediently generate silicic acid. At least before the cooling of the low-ferrite fraction, the aluminum content of the liquid slag material is regulated by the addition of an aluminate-containing material, such as bauxite. The high-ferrite fraction separated can be returned to the steel-making process to reduce or remove the addition of a flux in the production of steel.
A method for preparing a hydraulically settable cement base material and a flux for steel making starting from steel slags formed in a steel-making process, which method comprises the steps of adding an aluminate-containing material to the liquid slag material in the steel making vessel, separating the thus obtained slag material, forming a ferrite gradient in the obtained slags in the liquid state, in the absence of liquid steel, by adding a ferrite-precipitating compound, to obtain a high-ferrite fraction and a low-ferrite fraction, separating the low-ferrite fraction from the high ferrite fraction, cooling and comminuting the low ferrite fraction to obtain said hydraulically settable cement base material, and adding a flux to the steel making process by returning the high-ferrite fraction thereto.
Dependencies are inferred from the claim text.