Abstract: Pore wetting is one of the important factors affecting the floatability of porous minerals,i.e.cinder,lignite,metallurgical slag,etc.However,there are few studies on the accurate and quantitative characterization method of pore wetting.The essential relationship between the properties of wetting liquids and the pore wetting law has not been revealed yet.Therefore,in this investigation,the raw and hydrophobic active carbons are used to study the pore wetting law based on the physical properties of liquids.The quantitative relationship between 1H LF NMR porosity detected by 1H LF NMR and weighting porosity by weighting method is established.The feasibility of 1H LF NMR detection on the pore wetting of raw and hydrophobic samples in four liquids for different times is explored.The wetting law of pores of different sizes in raw and hydrophobic samples wetted by four liquids is discussed.The Crispation number is calculated to reveal the mechanism of physical properties of liquids affecting the pore wetting process of raw and hydrophobic samples.The result shows that the 1H LF NMR porosity has a linear function correlation with the weighting porosity after the raw and hydrophobic samples are wetted by four liquids.Thus,this device can quantitatively characterize the pore wetting percentage of raw and hydrophobic samples.The pores of different sizes conform to the “fast unchanged” wetting law when the raw and hydrophobic samples are wetted by four liquids.The turning point of the wetting rate from fast to slow occurs at 5 min.The relationship between the wetting percentage of the total pores and the wetting time is a first order kinetic equation.Pure water has the largest total pore wetting percentage for the raw sample but the smallest for hydrophobic sample.For raw sample,pure water achieves the largest wetting percentages of micro pores and transition pores.The n propanol and n hexadecane have the largest wetting percentage of meso pores,which are similar to hydrophobic sample.However,silicone oil has the lowest wetting percentage for pores of all sizes.The 60 min wetting percentages of pores in raw sample (except meso pores) decrease linearly with the increase of Crispation number,indicating that liquid viscosity dominates the pore wetting process.The wetting percentages of micro pores and transition pores in the hydrophobic sample from large to small are n propanol,n hexadecane,pure water and silicone oil.The 60 min pore wetting percentages in the hydrophobic sample (except meso pores) increase first and then decrease as the Crispation number increases.The synergistic effects of surface tension and viscosity on the pore wetting process are reflected.