A Research On Surface-Modification And Brighten Of Tourmaline Powder

Tourmaline is a kind of mineral which has the spontaneous electrode quality ; asthe representative mineral, which can help us study crystal electricity. and it is alsoone of the minerals which are utilized most generally in many fields now. Becauseof the exist of spontaneous electrode, Tourmalines are applied in many fields ,suchas in the protection of environment, ecological field, commodity, the industry ofdope, electromagnetism shielding and so on. The experiment of grinding has been carried out in order to study the affection ofthe size of tourmaline powder on the white degree and negative ion.The resultsshows that as the size of tourmaline powder minishs, the white degree increases andthe number of negative ion released reduce at the same time . After the primal powder being modified, we made a research on its the whitedegree and the release ratio of negative ion, we got the best condition for coatingtechnics as follows:choosing the granularity of material by the demand of facts; thebest amount coated presents when the proportionment of the quality of tourmalinepower and ceria power is 1:1; the higher is the temperature, the better is the result ,pH=6 is best for neutralization, the neutralization velocity is 26.5ml/min,theconsistence of the tourmalin powder is 9%。 The best condition for calcining asfollows : the time is half an hour at 500 centigrade, the calcine temperature isdepended on the demands of it`s use in fact ,we got anatase when the temperature isbelow 500 centigrade, when the temperature is between 500 centigrade and 800centigrade, both anatase and rutitle exist, and we got rutitle when the temperatureis above 850 centigrade. The innovation of this research is that we first use the method of deposition incovering tourmalin by TiO2. It improves the white degree of tourmalin, from 15.9 %to 60%, and the release ratio of negative ion from 600 unit/cm3 to 3000 unit/cm3above.These are important to expend the use of tourmalin. This kind tourmalin powder has abroad foreground in application. It can be used in producing white paint and whitecoating field, and also in the spinning field. It will create great valueapplications and -II-ABSTRACTeconomy. This paper gives the elements to the expending of the best condition forproducing.