Study On Surface Modification Of Ultra-fine Powder Of Tourmaline From The Second Mica Mine In Xinjiang Altai

China is rich in tourmaline resource.Tourmaline is not only has spontaneous polarizability,pyroelectricity and piezoelectricity,but also has characters of emitting far-infrared ray and releasing negative ion.It has been used as an excellent material in environment and health care. Ultra-fine powder of tourmaline can reflect its special characters easily because of its tiny particle size, large specific surface and high surface energy. but ultra-fine powder is likely to agglomerate together. Agglomeration of ultra-fine powder will influence its applied performances.Therefore it's important and significative to improve the dispersion property of ultra-fine powder.Tourmaline from the second mica mine in xinjiang altai area was studied by means of electron probe analysis,chemical composition analysis and X-ray diffraction ,and proved to be dravite. Inclusions were found such as quartz, magnetitean, microlith of tourmaline based on thin section arbitration.Different particle sizes were analyzed and the optimal particle size of dravite was 0.619um. Chemical composition analysis indicated the chemical composition of samples afer surface modification has changed slightly because of mechanochemistry effect.By semidry surface modification process,it was found the optimal surface modification technical conditions were: modifier sodium polyacrylate and sodium polyphosphate, optimal dosage 1.2% and 0.6%;assitant modifier silica hydrated, optimal dosage 4.0%; optimal pH 11. The treated samples showed better stability of dispersion.Samples before and afer surface modification were tested for infrared radiation ratio and negative ion concentration. The result showed: infrared radiation ratio of the samples afer surface modification decresed a little, the sample after surface modification increased .Modifier was absorbed on the surface of tourmaline particles by chemical and physical reaction. It's found that there were two adsorption layers on the surface of tourmaline particles: Inner layaer was chemical absorption that modifier chemically absorbed on the surface of tourmaline particles by reaction with hydroxide radical on it and outer layer was physical absorption.Thin section arbitration and chemical composition analysis indicated"zhenbaoshi"was not one of granite porphyry but one of quartz andesite.The data of infrared radiation ratio of"zhenbaoshi"and tourmaline showed that"zhenbaoshi"was not better than tourmaline, but the negative ion concentration showed"zhenbaoshi"was a little better than tourmaline.