In this paper the conductivities and pH values of 6 pairs of mineral dusts were measured and a comparative analysis was performed of the influences of the shape, granularity, temperature and time on their electric chemistry. The research results show that there is a positive correlation between the pH values/conductivities and finenesses of the minerals in water medium and that the conductivity is sensitive to temperature change with its maximum located at ca.60℃and a turning point showing a large_amplitude decrease appearing after 80℃in all samples. The pH values of most samples show a trend of rising progressively with time and all the samples approach stable values during balance after 8 hours. A new type of model has been proposed for the dissolution, ionization and conductivity of mineral dusts with cation exchange property. The dissolution rates of minerals are influenced by the granularity, surface activity,temperature, differential concentration, time etc. The pHand conductivity of mineral dusts are their surface characteristic values and can all_sidedly reflect the behavior tendencies of their sol- ubility, chemical activity, surface electricity, decomposition and remaining, preservation, compatibility etc.