Experimental study on desulfurization and ash reduction of high sulfur coal by magnetic separation and flotation combined process

In order to reduce the ash and sulfur content,carried on the magnetic separation for the coal after crushing and grinding under the conditions of the grinding fineness（＜ 0. 074 mm particle mass fraction） 97%,the flux density 1. 45 T,pulse 25 times/min; And then took the magnetic separation coal for flotation under this conditions of the coal slurry concentration 80 g/L,inhibitor dosage 1 500 g/t,collector dosage 1 700 g/t,foaming agent dosage 90 g/t. The test results showed that: the coal after crushing and grinding can obtained yield 69. 98%,sulfur content 2. 02%,ash 9. 98% under the best magnetic separation flotation conditions which could meet the requirements of production.