Carbon dioxide reduction in steelworks

US9322597B2 · kind B2 · utility

Assignee

• Siemens Aktiengesellschaft · DE

Inventors

• Manfred Baldauf · Erlangen, DE
• Günter Schmid · Hemhofen, DE

Key dates

• Filing date: Jun 12, 2012
• Grant date: Apr 26, 2016
• Expiry date: Dec 25, 2032

Classification

• Technology area (CPC Y): Emerging Cross-Sectional Technologies
• CPC primary: Y02P20/133
• WIPO field: Chemical engineering
• WIPO sector: Chemistry

Abstract

A method reduces carbon dioxide resulting from a steel production process. The carbon dioxide is reacted with an electropositive metal in combustion to produce carbon monoxide. The resultant carbon monoxide is fed back into the steel production process. In this method, the carbon monoxide can be used in a direct reduction method as a reduction gas or can be fed to a blast furnace process. The reacted metal can also be recovered by electrochemical conversion from its oxides or salts. In particular, a form of regenerative energy can be used to recycle the electropositive metal.