Methods and systems for recovering products from iron and steel slag
OwnerAh-Hyung Alissa Park, Xiaozhou Zhouinventors
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Abstract
Systems and methods for processing slag produced by iron and steel making processes are disclosed. The slag is treated produce a series of valued industrial products, such as metal oxides, metal carbonates, rare-earth metals, and water glass. The systems and methods also integrate slag processing with CO2 sequestration and flue gas desulphurization. Processing slag minimizes the land use for stockpiling or landfilling wastes produced from iron and steel making processes and protects the ground water underneath. Overall, the solid and gaseous emissions of an energy-intensive and highly polluted industrial process have been largely reduced, recycled and valorized in order to achieve a near zero-emission goal.
Claims15
A method of recovering products from a slag generated from an iron or steel making process comprising the following steps:
- 1) collecting an amount of the slag generated from the iron or steel making process;
- 2) isolating a non-magnetic-material-enriched portion from the slag by fracturing the slag into particles comprising a magnetic material and a non-magnetic material, and
- applying a magnetic separation force to the slag particles to produce a magnetic-material enriched portion and the non-magnetic-material enriched portion;
- 3) collecting a leachate from the non-magnetic-material-enriched portion comprising metal oxides, metal carbonates, metal silicates, and rare-earth elements;
- 4) precipitating at least one of the metal oxides and the metal carbonates from the leachate;
- and
- 5) collecting waste water and rare-earth elements from the leachate.
Dependencies are inferred from the claim text.