Fluidized bed opposed jet mill for producing ultrafine particles from feed material of a low bulk density and a process for use thereof

US11833523B2 · kind B2 · utility

Assignee

• HOSOKAWA ALPINE Aktiengesellschaft · DE

Inventors

• Tobias A. Fuchs · Wellesley, US
• Michael Muller · Munich, DE
• Bernhard Renner · Augsburg, DE

Key dates

• Filing date: Sep 30, 2021
• Grant date: Dec 5, 2023
• Expiry date: Dec 9, 2041

Classification

• Technology area (CPC B): Performing Operations; Transporting
• CPC primary: B02C19/068
• WIPO field: Chemical engineering
• WIPO sector: Chemistry

Abstract

In consideration of increasing throughput rate of a stable operating process as well as making the process energy-efficient, the aim is to optimise a fluidised bed opposed jet mill and a dedicated process to produce ultrafine particles from a feed material of low bulk density with a housing in vertical design, with a product feed point and a product discharge, with a grinding zone located in the lower area of the housing which has grinding nozzles spaced evenly around the circumference whose jets intersect at one central point and with a classifying device installed in the upper area of the housing. This is achieved by the feed material dosed to the mill from the bottom into the mill sump as a gas-particle mixture, whereby a deflector hood is located above the feed point and below the grinding nozzle level, and the grinding gas nozzles designed to be flush with the walls.