Patent · US Expired

Process for separating mineral wool fibers from nonfibrous materials

US4254823A · kind A · utility

4Cited by

4References

17Claims

0Family size

Assignee

Berol Kemi AB

Inventors

Nils G. Cederqvist · Lerdala, SE
Karl M. E. Hellsten · Ödsmål, SE
Kerstin E. Henriksson · Kode, SE
Lars A. S. Waag · Stenungsund, SE

Key dates

Filing date	Apr 27, 1977
Grant date	Mar 10, 1981
Priority date	—
Expiry date	Apr 27, 1997

Classification

Technology area (CPC C)Chemistry; Metallurgy
CPC primaryC04B24/12
WIPO fieldMaterials, metallurgy
WIPO sectorChemistry

Abstract

A process is provided for the separation of nonfibrous material from mineral wool fibers which comprises dispersing the fibers in an aqueous solution comprising a surfactant having at least one hydrophobic group containing at least eight carbon atoms and at least one cationic hydrophilic group having at least one nitrogen or sulfur atom, such as a quaternary ammonium surfactant. The fibrous material is dispersible in the surfactant solution, while the nonfibrous material is not and consequently can be separated by centrifuging or settling and decantation.

Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.