Recirculating grinding mill with external risers

US8210458B2 · kind B2 · utility

Assignee

• KHD Humboldt Wedag GmbH · DE

Inventors

• Siegfried Strasser · Much, DE
• Stefan Seemann · Mettmann, DE

Key dates

• Filing date: Apr 8, 2009
• Grant date: Jul 3, 2012
• Expiry date: Apr 8, 2029

Classification

• Technology area (CPC B): Performing Operations; Transporting
• CPC primary: B07B9/02
• WIPO field: Chemical engineering
• WIPO sector: Chemistry

Abstract

A recirculating grinding mill, including at least two rolling presses for comminuting the material to be ground, at least two first classifiers for classifying a coarse-grain fraction, at least one second classifier for classifying a fine-grain fraction and a medium-grain fraction from the fractions classified in the at least two first classifiers. The feedstock is fed into the recirculating grinding mill passing the at least two rolling presses and the at least two first classifiers and then the at least one second classifier and the medium-grain fraction and the coarse fraction of the at least two first classifiers being fed once again to the rolling presses, and the at least two first classifiers being arranged underneath the at least two rolling presses. The rolling presses are placed between at least two risers for transporting the circulating material being ground.