Distillation: processes – thermolytic – Feed other than coal – oil shale or wood
Patent
1995-02-06
1997-09-23
Kim, Christopher
Distillation: processes, thermolytic
Feed other than coal, oil shale or wood
201 27, 201 42, 202100, 202131, 202136, 202184, 134 2, 134 10, 422 59, C10B 5100
Patent
active
056700245
DESCRIPTION:
BRIEF SUMMARY
SPECIFICATION
The invention relates to a method of and a device for thermal treatment of waste and/or residual materials, particularly of fiberglass, glass silk, glass wool, glass mats coated with organic materials including products made thereof according to the kind of the claims also with respect to their reuse.
The reuse of fiber glass waste, glass silk waste and products made thereof, and/or glass wool waste and similar materials which include fiber glass, as filling materials, for example, in the plastic products or the building industry, or the recovery for raw products for the glass melting process requires the removal of organic cover materials during the manufacturing process. This can be achieved by rinsing when the cover layer is in a liquid state, that is, has not hardened, yet, which is, however, disadvantageous for environmental reasons and expensive owing to the comparatively high water consumption.
Very often it has been tried to remove an organic envelope from fiber materials by heat treatment. Thus the French Patent Specification FR-PS 2199 856 discloses a method in which the organic materials contained in residuals of anorganic fibers are fed into an electrically heated furnace, the upper zone of which has such a temperature which melts the cover layer from the residual products. Resulting gases pass off via a respective exhaust duct.
Such a solution is disadvantageous since the combination of preparation and melting process leads to deficiencies in quality. Since waste of glass silk is not exclusively for being melted again it is very often thermally treated in plants specially devised for that purpose. So from the Patent Specification DD-PS 113 209 a method for preparation of glass silk waste is known, where the latter is first pressed to form mats, then put on lorries to be heated in a tunnel kiln and then is water quenched. This step is followed by a mechanical crushing. It is further known from the DE-OS 28 49 476 to subject pre-crushed fiber glass waste to a three-stage thermal treatment with gradually rising temperatures. This is achieved by employing horizontally or vertically operating pusher-type furnaces, in which the waste is stage-wise transported and remains a considerable time at each stage.
Furthermore a method is known from the Patent Specification DD-PS 146450 for a recovery of glass raw material from waste resulting from the glass silk spinning process. Said waste is mechanically crushed under the jet assembly tank and passes within a three-hour-period preferably two temperature stages of a gas or electrical continuous heating furnace. In the first stage a cover layer is burnt off and in the second stage a cooling down below 150.degree. C. is carried out which, is followed by a mechanical crushing, whereby resulting gases are suctioned off during the first stage. Such methods require an additional operational step before the thermal treatment, for example, a preliminary crushing of the waste, which, in turn, requires special devices. The furnace transit time of the waste from the glass silk spinning process is relatively long. Furthermore, the DE-OS 23 41 406 discloses a method and device for a recovery of glass fibers from coiled up endless mats of glass fiber waste. After passing a pre-heater the mats are kept floating over a traveling screen by force of the heating gases. The flue gases from the furnace are fed into the pre-heater. The amount of liquid gas required makes the method for recovery of the glass fibers too expensive. The Patent Specification DD-PS 233 994 discloses an electric continuous-heating furnace which operates with circulating air. This invention is disadvantageous since when fine-fibrous material is treated the air stream probably drags along fiber particles or individual fibers which, in turn, leads to short circuits of the electrical heating.
Finally, drying drums or rotating kilns are known from the Patent Specifications DE-PS 258 336 and DE-PS 887 626, respectively, which are provided with lifting paddles or surfaces on the interior walls
REFERENCES:
patent: 3847664 (1974-11-01), Gravel
patent: 3950861 (1976-04-01), Weimer et al.
patent: 5019171 (1991-05-01), Hanson, Jr. et al.
Baltzer Franz
Juptner Horst
Kasper Horst M.
Kim Christopher
WTU Warmetechnik und Umweltschutz GmbH
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