超声-混酸法提纯微晶石墨
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摘要
采用超声-混酸法对湖南郴州微晶石墨进行了提纯实验,通过XRD、SEM和激光粒度分析等测试手段对提纯前后的样品进行了物相、形貌和粒度分析。结果表明:采用优化的提纯工艺可将微晶石墨固定碳含量从81.54%提高到99.97%;超声处理不会显著影响微晶石墨的层状结构,但颗粒因机械效应和空化作用而破碎;随着超声时间的增加,微晶石墨粒度逐渐减小,颗粒表面变光滑,固定碳含量也相应增加。
The microcrystalline graphite from Chenzhou, Hunan province was purified by mixed acid of hydrofluoric acid(HF) and hydrochloric acid(HCl) combined with ultrasonic treatment. The mineral components, morphology, and size of samples before and after purification were studied via XRD, SEM and laser particle size analysis. The results show that the fixed carbon content of microcrystalline graphite can be increased from 81.54% to 99.97% by using the optimized purification process. The ultrasonic treatment has no significant effect on the lamellar structure of microcrystalline graphite, but the particles become small fragments due to the mechanical effect and cavitation. With the increase of ultrasonic time, the particle size of microcrystalline graphite is gradually reduced, the surface of the particles becomes smooth, and the content of fixed carbon increases correspondingly.
The microcrystalline graphite from Chenzhou, Hunan province was purified by mixed acid of hydrofluoric acid(HF) and hydrochloric acid(HCl) combined with ultrasonic treatment. The mineral components, morphology, and size of samples before and after purification were studied via XRD, SEM and laser particle size analysis. The results show that the fixed carbon content of microcrystalline graphite can be increased from 81.54% to 99.97% by using the optimized purification process. The ultrasonic treatment has no significant effect on the lamellar structure of microcrystalline graphite, but the particles become small fragments due to the mechanical effect and cavitation. With the increase of ultrasonic time, the particle size of microcrystalline graphite is gradually reduced, the surface of the particles becomes smooth, and the content of fixed carbon increases correspondingly.
引文
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[2]王琪,冯雅丽,李浩然,等.石墨的浮选动力学模型及浮选行为研究[J].非金属矿,2016,39(3):11-13,52.
[3]林前锋.天然微晶石墨的提纯方法:中国,201410705623.9[P].2015-04-08.
[4]LU X J,FORSSBERG E.Preparation of high-purity and low-sulphur graphite from Woxna fine graphite concentrate by alkali roasting[J].Minerals Engineering,2002,15(15):755-757.
[5]洪泉,何月德,刘洪波,等.纯化处理对天然微晶石墨电化学性能影响的研究[J].非金属矿,2010,33(3):45-48.
[6]宋春玉,张杰.贵州某煤矿煤中隐晶质石墨脱硅除杂研究[J].非金属矿,2012,35(2):24-27.
[7]黄如柏.微晶石墨提纯方法研究[J].非金属矿,1996,19(6):38-39.
[8]姜芳,宾晓蓓,涂秉峰,等.盐酸一氢氟酸法纯化制备微晶石墨研究[J].炭素技术,2014(5):23-25.
[9]CHELGANI S C,RUDOLPH M,KRATZSCH R,et al.A review of graphite beneficiation techniques[J].Mineral Processing&Extractive Metallurgy Review,2015,In press(1):58-68.
[10]杜林虎,潘伟.超声波对鳞片状石墨的粉碎作用及结构影响[J].硅酸盐通报,2000,19(4):27-30.
[11]彭德强,李青侠,郑丽娟.超声波净化鳞片石墨表面的试验研究[J].硅酸盐通报,2014(3):662-665.