Plant and method for the thermal treatment of solids

US10793928B2 · kind B2 · utility

Assignee

• OUTOTEC (FINLAND) OY · FI

Inventors

• Michael Ströder · Neu-Anspach, DE
• Roberto Valery · Oberursel, DE
• Sebastian Lang · Darmstadt, DE
• Suvi Rannantie · Frankfurt am Main, DE
• Vincent Siauw · Frankfurt am Main, DE
• Gergö Rimaszeki · Oberursel, DE

Key dates

• Filing date: Feb 24, 2020
• Grant date: Oct 6, 2020
• Expiry date: Feb 24, 2040

Classification

• Technology area (CPC Y): Emerging Cross-Sectional Technologies
• CPC primary: Y02P10/134
• WIPO field: Materials, metallurgy
• WIPO sector: Chemistry

Abstract

A method and its related plant for the thermal treatment of iron containing oxide, in which fine-grained solids are heated in a preheating calcining stage and exposed to a reduction gas in a subsequent reduction stage. Off-gas from the reduction stage is guided through a separation device wherein water originating from the reduction stage is separated. The water separated in the separation device is recycled into a water treatment section, from which the recycled water is supplied to a water electrolysis plant and/or a steam reforming plant producing hydrogen, and the produced hydrogen is supplied to the reduction stage as reductant and/or to the preheating calcining stage as fuel and/or to the gas heater as fuel and/or from which the recycled water is supplied to the separation device.