Abstract: The filtration performance of different sinters after fine grinding is obviously different， and most of them are difficult to filter after fine grinding. In order to study the influence factors on the filtration performance of different fine grinding sinter fines， five kinds of sinter powders， namely Roy Hill powder， Brazilian powder， Angora powder， Kenya powder and Mauritania powder， were finely ground to -0.074 mm accounting for 86.60%. The filtration test was carried out under the conditions of pulp concentration of 60%， pressure of 0.06 MPa and filtration time of 180 s， and the relationship between the surface morphology， specific surface area， surface water adsorption and filtration performance was studied. The results showed that after the fine grinding of the five kinds of sinter fines， the filter cake with rough surface and more adherent fine particles has higher moisture content and lower filtration rate. The specific surface area value of the mineral powder with higher moisture content and lower filtration rate is also higher， and the correponding surface roughness degree are high. The maximum molecular binding water adsorbed on the surface of ore powder and the capillary water that cannot be removed by filtration determine the moisture content of filter cake. The adsorption capacity of bound water on the surface of mineral powder with high water content of filter cake and capillary effect among these particles are stronger. Therefore， improving the surface properties of fine grinding sinter powder could be used as a way to improve the filtration performance of fine grinding sinter powder.

Key words: fine grinding sinter powder, filtration performance, surface roughness degree, specific surface area, water adsorbed on the surface