Abstract: In this paper, float-sink test for ZhunDong coal was studied. Then the ash chemical compositions and melting characteristics are analyzed to explore the segregation of minerals in ZhunDong coal in different density degree. The research results show that because of different formation, density, etc of minerals in ZhunDong coal, the contents of SiO2, Al2O3 and Fe2O3 of coal ash chemical composition assemble to the high level density degree samples. The contents ofCaO, MgO and SO3gather to lower density degrees. And the contents of TiO2 and K2O+Na2O are stable. The mullite (3Al2O3.2SiO2)generated from Al2O3 and SiO2 under high temperature is the main reason that ash fusion temperature of ZhunDong coal showed a rising trend with density increased. Due to generation of low melting point compounds, such as Al2O3.SiO2.Fe2O3, FeO.SiO2 and 2FeO.SiO2 in reducing atmosphere because of the low SiO2 and high Fe2O3, the coal ash melting temperature of enrichment samples from of 1.5-1.8 density degree is low.In addition, the slagging indices, such as acid to alkali, silicon value, sodium oxide content and sulfur content, indicates that the ZhunDong coal showed lower fouling and slagging characteristicsafter flotation segregation of minerals.