2016-08-242016-08-241996-06-04http://hdl.handle.net/10919/72314An apparatus for separating impurities from coal, includes a device for removing a predetermined amount of ash-forming substances from the coal and a device for removing a predetermined amount of high specific gravity (e.g., pyrite) from the coal having been processed by the ash-forming substance removing device. The ash-forming substance removing device and the high specific gravity material removing device each possess characteristics that allow them to more efficiently reject different types of mineral impurities from coal.application/pdfenPatenthttp://pimg-fpiw.uspto.gov/fdd/10/225/055/0.pdf8076730209/170209/12.1209/18209/164209/168B03B9/005B03B9/005522510