Beneficiation of metal slags for use as cement material
AssigneeCemVision AB
InventorsPaul Johan Sandberg, Claes Göran Kollberg, Mats Erik Åhlin, Francis Louis Kemeny
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Abstract
Methods and systems are provided for forming a cement material incorporating an industrial byproduct. In at least one embodiment, a method for forming a cement material includes maintaining a slag as an at least partially molten material and adding one or additives to modify the at least partially molten material. The method further comprises cooling the at least partially molten material to comprise a solid non-metallic fraction with a substantially amorphous molecular structure and a metal fraction that is substantively separated from the solid non-metallic fraction.
Claims20
A method for forming a cement material, the method comprising:
- maintaining a slag, the slag to leave a furnace as an at least partially molten material;
- adding one or more additives to the at least partially molten material;
- and
- cooling the at least partially molten material to comprise a solid non-metallic fraction and a metal fraction that is substantively separated from the solid non-metallic fraction,
- wherein the solid non-metallic fraction has an amorphous content of greater than 90%.
A method for forming a cement material, the method comprising:
- maintaining a slag, the slag to leave a furnace as an at least partially molten material;
- adding one or more additives to the at least partially molten material;
- cooling the at least partially molten material to comprise a solid non-metallic fraction and a metal fraction that is substantively separated from the solid non-metallic fraction;
- determining if the solid non-metallic fraction has an amorphous content greater than 90%;
- if the solid non-metallic fraction is determined to have the amorphous content greater than 90%, preparing the solid non-metallic fraction for use as a cement replacement material or a supplementary cementitious material;
- and
- if the solid non-metallic fraction is determined to have an amorphous content less than 90%, preparing the solid non-metallic fraction for use as a raw material in a cement clinkering process.
A method for forming a cement material, the method comprising:
- adjusting a chemical composition of a molten slag to obtain a basicity, the basicity a ratio of (CaO+MgO)/SiO2 of less than 1.4;
- adding one or more reducing agents, the one or more reducing agents comprising one or more of silicon or aluminum, to the molten slag to recover one or more metals from the molten slag;
- and
- rapidly cooling a remaining portion of the metal slag to maintain an amorphous content of the cooled remaining portion at greater than 90% by weight.
Dependencies are inferred from the claim text.