Agglomerated stone for using in shaft, corex or blast furnaces, method for producing agglomerated stones and use of fine and superfine iron ore dust

US8025727B2 · kind B2 · utility

Assignee

• Thyssenkrupp Steel AG · DE

Inventors

• Horst Mittelstädt · Bochum, DE
• Stefan Wienströer · Hamm, DE
• Reinhard Fusenig · Moers, DE
• Ronald Erdmann · Dortmund, DE
• Klaus Kesseler · Dortmund, DE
• Matthias Rohmann · Duisburg, DE

Key dates

• Filing date: May 25, 2005
• Grant date: Sep 27, 2011
• Expiry date: Aug 1, 2027

Classification

• Technology area (CPC Y): Emerging Cross-Sectional Technologies
• CPC primary: Y02P10/20
• WIPO field: Materials, metallurgy
• WIPO sector: Chemistry

Abstract

In order to also be able to economically use iron ore dust which is created by the extraction and preparation of iron ore and has not been usable until now, the invention proposes an agglomerated stone comprising (in wt. %) 6-15% of a cement binding agent, up to 20% of a carbon carrier, up to 20% of residual and recyclable substances, optionally up to 10% of a coagulation and solidification accelerator and the remainder consisting of iron ore in a stone format in the form of particles having a particle size of less than 3 mm as well as possessing after three days an initial strength of at least 5 N/mm2 and after 28 days a cold compression strength of at least 20 N/mm2. As a result of the particular hardness St and form stability thereof even at high temperatures T, agglomerated stones according to the invention are especially suitable for use in shaft, corex or blast furnaces. The invention also relates to a method for producing agglomerated stones according to the invention.