Glass manufacturing – Processes of manufacturing fibers – filaments – or preforms – With charging or pretreatment of batch material
Patent
1996-10-07
2000-05-30
Hoffmann, John
Glass manufacturing
Processes of manufacturing fibers, filaments, or preforms
With charging or pretreatment of batch material
65 19, 65 27, C03B 508
Patent
active
060678216
ABSTRACT:
A process for making mineral wool fibers having high-temperature stability consisting essentially of: (a) preparing a mixture containing basalt and a quantity of uncalcined raw bauxite sufficient to provide the resulting fibers with an alumina content of at least 18 weight percent, preferably of from 19 to 23 weight percent; (b) heating the mixture to a temperature sufficient to form a substantially homogeneous melt, e.g., in a cupola furnace using coke in a quantity of from about 11 to 25 percent by weight of the mixture; and (c) forming the melt into fibers. The mixture may optionally contain a flux, e.g., limestone and/or dolomite, such as a flux providing a weight ratio of limestone plus dolomite to basalt of less than about 0.6, e.g., 0.1-0.4. The mixture may also contain slag in a weight ratio of slag:basalt of less than about 1.0, more preferably about 0.6. At least about 90% of the uncalcined raw bauxite is of a particle size capable of passing through a 150-mm mesh screen but incapable of passing through a 25-mm mesh screen, more preferably capable of passing through a 125-mm mesh screen but not a 50-mm mesh screen. Preferably, the bauxite has a bound-water content of 10-33 weight percent. The weight ratio of alumina to silica in the fibers is preferably greater than 0.35.
REFERENCES:
patent: 2428810 (1947-10-01), Powell
patent: 2520168 (1950-08-01), Powell
patent: 2520169 (1950-08-01), Powell
patent: 4560606 (1985-12-01), Rapp et al.
patent: 4818221 (1989-04-01), Besne
patent: 5312806 (1994-05-01), Mogensen
Merriam Webster's "Webster's Ninth New Collegiate Dictionary" 1990, p. 709.
"Effects of Chemical Composition of Man-made Vitreous Fibers on the Rate of Dissolution in Vitro at Different pHs" by V.R. Christensen, S. Lund Jensen, M. Gulderg, and O. Kamstrup of Rockwool International A/S, Hedehusene, Denmark, Environ Heeealth Perspect 102 (Suppl 5): 83-86 (1994).
"Investigation on the durability of the stone wool HT in rat lungs" by B. Bellmann and H. Muhle Nov. 1994.
"Nomenclature of Man-Made Vitreous Fibers" by the Nonmenclature Committee of TIMA Inc. Apr. 15, 1991.
Baybutt George D.
Jackson James Roger
Pennington Harry
Rapp Charles F.
Barns Stephen W.
Eckert Inger H.
Hoffmann John
Owens Corning Fiberglas Technology Inc.
LandOfFree
Process for making mineral wool fibers from lumps of uncalcined does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Process for making mineral wool fibers from lumps of uncalcined , we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Process for making mineral wool fibers from lumps of uncalcined will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-1902271