| 摘要 |
A process is disclosed for recovering re-usable bitumen from waste bituminous roofing felt and the like. The waste material is cooled, preferably to 0 DEG C. to 5 DEG C., and then comminuted to a particle size less than 5 mm, for example using a flail. The comminuted material is added to water and the material which floats is collected, melted and then filtered to remove particulate or fibrous impurities. Additives may be added to the molten material to adjust its melting point, according to the eventual use of the recovered bitumen. Any fibrous impurities filtered out may be treated with white spirit or kerosene to extract further bitumen, which is then recovered from the solvent.
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