초록 ▼

A method for removing the ash mineral matter content of coal and transporting the ash free coal from the point of ash removal to a coal use point comprising grinding run-of-mine coal to a desired particle size, mixing the coal particles with water and liquid carbon dioxide in a vessel in a swirling,

A method for removing the ash mineral matter content of coal and transporting the ash free coal from the point of ash removal to a coal use point comprising grinding run-of-mine coal to a desired particle size, mixing the coal particles with water and liquid carbon dioxide in a vessel in a swirling, fluidized state at a pressure, temperature, and for a residence time sufficient to free substantially all of the ash mineral matter from the coal and form an ash free coal/mineral matter slurry, separating the ash free coal particles from the slurry by froth floatation, drying the ash free coal particles, forming a slurry of the ash free coal particles with liquid carbon dioxide, transporting the ash free coal/liquid carbon dioxide slurry by pipeline to a coal use point, deslurrying the ash free coal/liquid carbon dioxide slurry, recovering the ash free coal particles for intended use and recycling the coal-free liquid carbon dioxide recovered from deslurrying for treating additional coal in the ash removal step.

대표청구항 ▼

A method for removing the ash mineral matter content of run-of-mine coal comprising: (a) grinding the run-of-mine coal to a particle size to form a suitable slurry; (b) mixing the coal particles with water and liquid carbon dioxide in a vessel; (c) determining the solubility parameter of said coal a

A method for removing the ash mineral matter content of run-of-mine coal comprising: (a) grinding the run-of-mine coal to a particle size to form a suitable slurry; (b) mixing the coal particles with water and liquid carbon dioxide in a vessel; (c) determining the solubility parameter of said coal and maintaining the mixture of coal particles, liquid carbon dioxide, and water in the mixing vessel in a swirling, fluidized state at a pressure, temperature, and for a residence time sufficient to separate ash mineral matter from the coal particles and form an ash free coal/mineral matter slurry; and (d) separating the ash free coal particles from the ash free coal/mineral matter slurry by froth floatation and recovering the coal particles substantially free of ash mineral matter. A method for removing the ash mineral matter content of run-of-mine coal and transporting the low ash content coal from the ash demineralizing point to a coal use point comprising: (a) grinding the run-of-mine coal to a particle size to form a suitable slurry; (b) mixing the coal particles with water and liquid carbon dioxide in a vessel; (c) determining the solubility parameter of said coal and maintaining the mixture of coal particles, liquid carbon dioxide, and water in the mixing vessel in a swirling, fluidized state at a pressure, temperature, and for a residence time sufficient to separate ash mineral matter from the coal particles and form an ash free coal/mineral matter slurry; (d) separating the low ash coal particles from the coal/mineral slurry by froth floatation and recovering the coal particles substantially free of ash mineral matter; (e) drying said recovered ash free coal particles; (f) slurrying said dried ash free coal particles with liquid carbon dioxide to form an ash free coal/carbon dioxide slurry; (g) pumping said slurry through a pipeline to said coal use point; (h) deslurrying said ash free coal/carbon dioxide slurry at said coal use point to separate said ash free coal and said liquid carbon dioxide; and (i) recovering said coal-free liquid carbon dioxide and passing said liquid carbon dioxide through a pipeline for admixture with said coal being treated in step (b).