In order to improve desulfurization and deashing efficiency of fine coal,taking the fine coal which was prepared by jigging medi-um-sulfur Gansu coal as research object,the grinding-magnetic separation test,high precision magnetic separation test and clean coal re-flotation test were conducted. The results showed that,when magnetic flux density was 1. 57 T,pulse strength was 25 times in one minute, fine mesh wasnˊt added copper sleeve poly magnetic medium,the flotation effects was the best. The sulfur content and yield of clean coal was 1. 25% and 95% ,the loss of coal samples was the least. The reflotation test on clean coal was conducted under optimum condition, when the dosage of CaO and kerosene was 1 kg/ t and 1360 g/ t,the sulfur and ash content of clean coal could decreased to 1. 09% and 7. 54% . The desulfurization and deashing efficiency was 32. 05% and 45. 63% ,the removal efficiency of pyrite was 50. 55% . The experi-mental results showed that,the jigging-breaking-screening-magnetic separation- flotation process could reduce the sulfur and ash content of clean coal to 1. 09% and 7. 54% and improve the yield of clean coal to 86. 03% .%为提高细粒煤的脱硫率和脱灰率，以甘肃中硫煤经跳汰机处理后的细粒煤为试验煤样，进行磨矿-磁选试验、高精度磁选试验和磁选精煤再浮选试验。结果表明，磁通密度1.57 T，脉冲强度25次/ min，采用细网不加铜套聚磁介质时，煤泥磁选效果最好，精煤硫分为1.25%，精煤产率达到95%，煤样损失量最小。在最佳磁选条件下进行磁选精煤再浮选试验，CaO 用量1 kg / t，煤油用量1360 g / t时，煤泥浮选效果最好，得到硫分1.09%，灰分7.54%的精煤，精煤脱硫率为32.05%，脱灰率为45.63%，黄铁矿硫脱除率为50.55%。细粒煤磁选-浮选试验数质量流程表明，原煤经跳汰—破碎—筛析—磁选—浮选后，可获得产率86.03%，硫分1.09%，灰分7.54%的精煤产品，基本达到矿山要求。
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