Methods and apparatus for two-stage crushing

US4690335A · kind A · utility

Assignee

• Krupp Polysius AG · DE

Inventors

• Tyark Allers · Sendenhorst, DE
• Gotthardt Blasczyk · Beckum, DE

Key dates

• Filing date: Mar 10, 1986
• Grant date: Sep 1, 1987
• Expiry date: Mar 10, 2006

Classification

• Technology area (CPC B): Performing Operations; Transporting
• CPC primary: B02C25/00
• WIPO field: Chemical engineering
• WIPO sector: Chemistry

Abstract

A method and apparatus for two-stage crushing of material wherein the material is subjected to crushing first in a constant speed roll mill and then in a second mill. Grit resulting from the crushing is returned to the first mill in a proportion to maintain the filling level of combined fresh material and grit substantially constant even when the quantity of such fresh material changes.