C - Chemistry – Metallurgy – 10 – C
Patent
C - Chemistry, Metallurgy
10
C
259/1, 6/158
C10C 3/00 (2006.01) C08K 3/04 (2006.01) C08L 95/00 (2006.01) E01C 7/18 (2006.01)
Patent
CA 1086457
IMPROVED ASPHALT MIXTURE ABSTRACT A process for preparing an improved asphalt mixture by adding coal materials thereto. Low carbon content coal materials are separated into first and second portions, the first portion being soft-burned at approximately 600°F and the second portion being exposed to a number of wetting and drying cycles, followed by a thorough leaching. The first and second portions are crushed and screened to produce a fine particulate coal material having a maximum diameter passing through a 200 mesh screen, and a larger size coal material having a maximum diameter of 3/4 of an inch. In a first embodiment, an asphalt paving material is produced by adding the fine particulate coal materials to an asphalt- aggregate mixture in a proportion of approximately 75% of the first portion and approximately 25% of the second portion of the fine particulate coal materials, such that the coal materials equal approximately 6 to 8% by weight of the total mixture. The resulting asphalt mixture is heated at approx- imately 300°F., and may be stored at this temperature in order to increase the mechanical bonds between the asphalt and aggregate. In a second embodiment the larger size coal materials and/or the fine particulate coal materials are used as a filter medium to remove pollutants from a liquid effluent stream, and are then added to an asphalt mixture with the fine particulate coal materials in the same prop- ortions as in the first embodiment. The asphalt-coal mater- ial mixture is then heated at approximately 300°F, and may be stored for a period of time to increase the mechanical bonds between the asphalt and coal materials. The resulting mixture may be compressed into any desirable shape, the poll- utants being effectively sealed within the coal materials, providing safe and efficient long term storage or disposal. - 1 -
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