RESEARCH ON SURFACE ELECTRICITY PROPERTY OF TOURMALINE POWDER

The surface electricity property of micrometer tourmaline powder, divided into three groups in terms of different component, size and heat treated temperature, is tested accurately by means of Laser Size Analyzer and Zeta Potential Analyzer.The testing result show that the tourmaline powder particle in water is electronegative under neutral condition; that the Elbaite powder has higher zeta potential than other species of the tourmaline; that the tourmaline size is smaller, its surface potential is higher, and its surface activity is stronger correspondingly; that the tourmaline powder heat-treated under deoxidization condition has higher surface potential than that heat-treated under oxidation condition; and that the is o electric point of tourmaline is in the range of acidity, and the isoelectric point spot of dravite is 5.38.