Filling cavities in mining

US4786211A · kind A · utility

Assignee

• BASF SE

Inventors

• Bernd Leutner · Bischofswerda, DE
• Berthold Mueller · Salisbury, US
• Wilhelm Volkenborn · Marl, DE

Key dates

• Filing date: Aug 6, 1987
• Grant date: Nov 22, 1988
• Expiry date: Aug 6, 2007

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C04B2111/00724
• WIPO field: Materials, metallurgy
• WIPO sector: Chemistry

Abstract

Cavities in mining are filled by introducing a mixture consisting of a slurry or sludge which evolves CO.sub.2, foams and solidifies and predominantly comprises alpha-hemihydrate, alpha-CaSO.sub.4. 0.5 H.sub.2 O, an alkali metal or alkaline earth metal carbonate and water, by a method in which the mixture is mixed with a bisulfate-containing aqueous solution or suspension of one or more metals before being introduced into the cavities to be filled.