초록 ▼

An integrated method of removing alkali metal compounds from sulfur-bearing coal is disclosed. The coal is comminuted (4) and mixed (10) with water (8) to form a slurry (12). In the preferred embodiment, the slurry (12) is comingled with an SO2-bearing gas (16) in a transport pipeline (52) to form a

An integrated method of removing alkali metal compounds from sulfur-bearing coal is disclosed. The coal is comminuted (4) and mixed (10) with water (8) to form a slurry (12). In the preferred embodiment, the slurry (12) is comingled with an SO2-bearing gas (16) in a transport pipeline (52) to form an acidic slurry which dissolves the alkali compounds out of the coal. The slurry is then separated (22) into a solid portion (24) and a liquid portion (26), the solid portion (24) being combusted (34) to form the SO2-bearing gas (16).

대표청구항 ▼

A process for beneficiating a sulfur-bearing coal by removing at least a portion of any alkali metals present therein, comprising the steps of: comminuting said coal; forming an acidic liquid-solid slurry of the comminuted coal and water by comingling an SO2-bearing gas with the water to induce the

A process for beneficiating a sulfur-bearing coal by removing at least a portion of any alkali metals present therein, comprising the steps of: comminuting said coal; forming an acidic liquid-solid slurry of the comminuted coal and water by comingling an SO2-bearing gas with the water to induce the formation of a sulfur-based acid therein; maintaining the pH of said acidic liquid-solid slurry to a value equal to or less than 5 for a period of time sufficient to dissociate any alkaline metals present within the coal by forming dissolved sulfur compounds in the liquid portion of said slurry by reaction with the sulfur-based acid; separating the liquid portion of said acidic slurry containing the dissolved alkali metal compounds from the solid portion of said slurry containing the now beneficiated coal; and combusting the beneficiated coal in air to oxidize any sulfur compounds present therein, forming an SO2-bearing gas of which a portion is used to form said acidic liquid-solid slurry.