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将Foitite电气石在400～1000℃×2 h进行焙烧处理。采用XRD、FTIR、RAMAN光谱等研究热处理对电气石粉体物相结构、表面结构的影响。结果表明:随着热处理温度升高,电气石晶胞体积逐渐减小,在700℃具有最小值;热处理温度对电气石的表面电性有较大影响,随温度升高,电气石的Zeta电位呈增大趋势,当温度达到500℃时,Zeta电位值最大为-47.5 mV;经过热处理后,电气石物相发生明显变化,由镁电气石转化为布格电气石,当温度高于900℃,出现烧结现象,电气石开始分解,分解产物为Fe2O3和Al4B2O9;热处理不仅可使电气石中的Fe2+氧化成Fe3+,还可改变不同价态铁离子在结构中的占位(Y、Z位置)。
Foitite tourmaline calcined at 400 ~ 1000 ℃ × 2 h. The effects of heat treatment on the phase structure and surface structure of tourmaline powder were investigated by XRD, FTIR and RAMAN spectra. The results show that with the increase of heat treatment temperature, the unit cell volume of tourmaline decreases gradually and reaches the minimum value at 700 ℃. The heat treatment temperature has a great influence on the surface electric properties of tourmaline. With the increase of temperature, the zeta potential The maximum value of Zeta potential is -47.5 mV when the temperature reaches 500 ℃; after the heat treatment, the tourmaline phase changes obviously from magnesium tourmaline to cloth tourmaline, when the temperature is higher than 900 ℃ , The phenomenon of sintering occurs, the tourmaline begins to decompose and the decomposition products are Fe2O3 and Al4B2O9; the heat treatment can not only oxidize the Fe2 + in the tourmaline to Fe3 +, but also change the occupying positions (Y and Z positions) of the ferrous ions in different valence states in the structure, .