Preparation and Performance-measurement of Ultra-fine Tourmaline Powder

摘要

Tourmaline has the characteristics of piezoelectricity,thermoelectricity,spontaneous polarization and far-off infrared radiations.Ultra-fine powders of tourmaline have extensive applications in the fields of electron,chemical and environment protection,as well as health protection.The preparation technology of ultra-fine tourmaline powder is discussed.The key equipment of a pilot plant for producing ultra-fine tourmaline powder with jet mill and stirred ball mill is described.Using this pilot plant facility it is possible to produce tourmaline powder with particle size smaller than 100 nm,and a continuous production process can be realized.The final powder product has many superior performance such as high whiteness and large specific surface area,and it's a negative ions emission can reach the value of 7190 ions per cubic centimeter.