Compositions – Exfoliated or intumesced
Patent
1986-06-24
1990-06-05
Lander, Ferris H.
Compositions
Exfoliated or intumesced
252378P, C04B 2006
Patent
active
049312111
ABSTRACT:
Obsidian having less than one percent of combined water is expanded to a volume many times the original by a two stage heating process carried out in at least one refractory-lined, rotary kiln. It is heated gradually by a first flame to a temperature of 1800-1900 F., then subjected to a second flame at a temperature of 2400-2500 F. for a very few minutes. The heating is carried out in the presence of dust which has a softening point considerably above those temperatures. The dust prevents the softened obsidian from sticking to itself or to the lining of the kiln. In some embodiments, the entire process is carried out in a single kiln with both flames entering the discharge end of the kiln, the first flame being directed toward the feed end and the second flame directed transversely or toward the discharge end. In another embodiment, the obsidian is gradually heated in a first kiln, then immediately fed to a second rotary kiln where the second flame enters the feed end and is directed toward the discharge end. In the second embodiment, combustion gases from the second kiln are recycled back to the first kiln to aid in the gradual heating step.
REFERENCES:
patent: 2501698 (1950-03-01), Stecker
patent: 2501699 (1950-03-01), Stecker
patent: 2602782 (1952-06-01), Zoradi
patent: 2621160 (1952-12-01), Johnson et al.
patent: 2639269 (1953-05-01), Dube
patent: 3456933 (1969-07-01), Brouk
Kozu, "Thermal Studies of Obsidian . . . Japan", pp. 225-238 1929.
Mudd, "Industrial Minerals & Rocks" pp. 748-751 1949.
Johnson William J.
Martenson Alfred J.
Lander Ferris H.
Pyrofoam, Inc.
Sharp Robert Keith
LandOfFree
Process of expanding obsidian 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 of expanding obsidian, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Process of expanding obsidian will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-490281