Storage-stable spent potlining material, method for the production thereof, and use of the same as fuel

US12325835B2 · kind B2 · utility

Assignee

• Speira GmbH · DE

Inventors

• Ralf Lemke · Nettetal, DE
• Olaf Güßgen · Langenfeld, DE
• Kathrin Eckhard · Cologne, DE
• Joachim Höfler · Roetgen, DE
• Andreas Beermann · Stuttgart, DE
• Thorsten Kensy · Hückelhoven, DE

Key dates

• Filing date: May 17, 2024
• Grant date: Jun 10, 2025
• Expiry date: May 17, 2044

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C25C3/06
• WIPO field: Basic materials chemistry
• WIPO sector: Chemistry

Abstract

Spent potlining material contains spent potliner from aluminium electrolysis cells, and at least one hydrophobic binder. The hydrophobic binder being selected from wax, a waxlike compound or mixtures thereof. A method for producing a spent potlining material includes the steps of (a) providing spent potliner from aluminium electrolysis cells, (b) comminuting the spent potliner in at least one comminuting apparatus, (c) fractionating the spent potliner through a separating apparatus, (d) mixing the spent potliner with at least one hydrophobic binder, selected from wax, a waxlike compound or mixtures thereof, in a mixing apparatus, (e) portioning the mixture obtained in step (d), (f) withdrawing the spent potlining material The steps (b) to (d) are carried out in an inert gas atmosphere. Also, spent potlining material is used as fuel in power stations and also in connection with the production of mineral wool, cement and steel.