微波非热效应改善天然石墨提纯效果

基金项目: 四川省科技攻关项目（2010GZ0117 ）.

Purification of natural graphite by microwave assisted acid leaching

Department of Materials Science,Sichuan University,Chengdu 610064, China|
Deep-processing Laboratory of Graphite, Panzhihua University, Panzhihua 617000, China

Funds: Science and Technology Brainstorm Item of Si Chuan Province(2010GZ0117)

摘要: 研究了微波非热效应对天然石墨提纯效果的影响。结果表明，微波场的引入可将样品的碳质量分数由95.840%提高到99.%以上。微波功率、反应压力和反应时间对提纯效果都有一定影响。采用XRD和SEM对提纯产品的形貌和结构进行了表征，证明微波辅助酸法提纯后的天然鳞片石墨的表面形貌及晶体结构没有改变。在最佳条件下（混酸配比为1∶1，反应罐内压力为1.0MPa，辐照时间为25min，微波功率为800W），石墨经纯化后碳质量分数可达99.432%。
- 微波 /
- 石墨 /
- 提纯 /
- 非热效应
Abstract: Natural graphite was leached under microwave irradiation by acid mixtures containing HCl (12 mol/L) and HNO3 (16 mol/L). It was found that the purification efficiency was affected by microwave power, reaction pressure, reaction time and the acid ratio. The carbon content of the graphite increased from 95.84 to 99. 43% under optimized leaching conditions with an acid volume ratio of 1∶1, pressure of 1.0 MPa, reaction time of 25 min and microwave power of 800 W. SEM indicated that the morphology remained unchanged and XRD indicated that there was no apparent change in the 2θ peak position, peak height and full width at half maximum after the leaching.
- Microwave /
- Graphite /
- Purify /
- Non-thermal effect