Two-stage micronizer for reducing oversize particles

US6286771A · kind A · utility

Inventors

• Charles Brown · New Delhi, IN
• David Brown · Surrey, CA

Key dates

• Filing date: Apr 30, 1999
• Grant date: Sep 11, 2001
• Expiry date: Apr 30, 2019

Classification

• Technology area (CPC B): Performing Operations; Transporting
• CPC primary: B02C19/0037
• WIPO field: Chemical engineering
• WIPO sector: Chemistry

Abstract

Integrated first stage and second stage reduction mechanisms reduce coal, minerals, biomass, and other materials. A portion of the reductive work is done in the first stage by passing centrally fed feed material centrifugally from rotating rings to counter-rotating rings with destructive effects. The resulting material, significantly reduced in size, subsequently is stripped of oversize in the second stage by passing through a closely spaced and specially contoured final pair of annular rings or crushing elements between which particles larger than the limited space are crushed.