Determining the fineness of a ground material, in particular an ore, in a mill

US9221058B2 · kind B2 · utility

Assignee

• Siemens Aktiengesellschaft · DE

Inventors

• Christoph Huber · Basel, CH
• Günter Lugert · Birkenfeld, DE
• Randolf Mock · Munich, DE

Key dates

• Filing date: Aug 17, 2011
• Grant date: Dec 29, 2015
• Expiry date: Dec 3, 2032

Classification

• Technology area (CPC G): Physics
• CPC primary: G01N2291/02458
• WIPO field: Measurement
• WIPO sector: Instruments

Abstract

Methods and arrangements for determining the fineness of a ground material in a mill are provided, wherein the acoustic spectrum of the mill during the grinding process is used for concluding the fineness. The mill comprises a drum in which the ground material is present during the grinding process, said drum being driven by a magnetic drive having at least one magnetic segment during the grinding process, so that a rotating magnetic field generated with the aid of the magnetic drive causes the drum to rotate. In order to determine the acoustic spectrum, a voltage induced in a coil of the magnetic segment is determined at least intermittently. On the basis of a model, using the detected time-dependent induced voltage, conclusions can be drawn about the acoustic spectrum and therefrom about the fineness.