Method and plant for the production of a starting material for the production of rare earth magnets

US11311933B2 · kind B2 · utility

Assignee

• NETZSCH Trockenmahltechnik GmbH · DE

Inventors

• Frank Winter · Mühlheim, DE
• Wilhelm Fernengel · Kleinostheim, DE

Key dates

• Filing date: May 16, 2019
• Grant date: Apr 26, 2022
• Expiry date: Aug 13, 2039

Classification

• Technology area (CPC Y): Emerging Cross-Sectional Technologies
• CPC primary: Y02W30/50
• WIPO field: Materials, metallurgy
• WIPO sector: Chemistry

Abstract

A method and a plant for the production of a powdery starting material, which is provided for the manufacture of rare earth magnets, are disclosed. First of all, at least one magnetic material, which is comminuted into a powdery intermediate product with a possibly increased concentration of impurities, and/or at least one alloy including rare earth metal are provided, which includes a low concentration of impurities. A classification of the powdery intermediate product to at least one criterion takes place subsequently, wherein, for the classification of the powdery intermediate product with the increased concentration of impurities, at least one dynamic classifier is provided, which divides the powdery intermediate product with impurities into at least two fractions based on the at least one criterion, wherein at least a high concentration of impurities accumulates in a first fraction and no impurities or at least a lower concentration of impurities than in the case of the first fraction accumulate in a second fraction, and wherein the fraction without impurities or with a low concentration of impurities forms the starting material for the manufacture of rare earth magnets.