特大片鳞片石墨的分选及其制备的柔性石墨

李吉辉; 侯诗宇; 宿家瑞; 李宽; 韦鲁滨; 马力强; 沈万慈; 康飞宇; 黄正宏

doi:10.1016/S1872-5805(19)60012-0

特大片鳞片石墨的分选及其制备的柔性石墨

doi: 10.1016/S1872-5805(19)60012-0

1.
清华大学材料学院新型陶瓷与精细工艺国家重点实验室, 北京 100084;
2.
清华大学材料学院先进材料教育部重点实验室, 北京 100084;
3.
中国矿业大学(北京) 化学与环境工程学院, 北京 100083

详细信息

作者简介:
李吉辉,博士,助理研究员.E-mail:lijihui@mail.tsinghua.edu.cn

通讯作者:
黄正宏,教授.E-mail:zhhuang@mail.tsinghua.edu.cn

中图分类号: TQ165
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- 文章访问数: 396
- HTML全文浏览量: 123
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- 被引次数: 0
出版历程
- 收稿日期: 2019-01-01
- 录用日期: 2019-04-30
- 修回日期: 2019-03-31
- 刊出日期: 2019-04-28

Beneficiation of ultra-large flake graphite and the preparation of flexible graphite sheets from it

1.
State Key Laboratory of New Ceramics and Fine Processing, School of Materials Science and Engineering, Tsinghua University, Beijing 100084, China;
2.
Key Laboratory of Advanced Materials(MOE), School of Materials Science and Engineering, Tsinghua University, Beijing 100084, China;
3.
School of Chemical and Environmental Engineering, China University of Mining and Technology(Beijing), Beijing 100083, China

摘要

摘要: 为了保护近期中国发现的特大片鳞片石墨矿的超大鳞片不受分选加工过程的破坏，设计出"多破少磨+风选+分级磨浮"的联合工艺，对其进行了物理分选，采用碱熔+酸洗法进一步化学提纯，石墨插层化合物法制备出可膨胀石墨，并利用快速加热法得到膨胀石墨。结果显示，提纯后的特大片鳞片石墨的石墨化度高达99.9%，其膨胀石墨产品的膨胀体积高于400 mL/g，随机选取的膨胀石墨单个颗粒的长度大于40 mm，由此膨胀石墨轧制得的柔性石墨电导率高达2.78×10⁵ S/m。
- 特大片鳞片石墨 /
- 膨胀石墨 /
- 柔性石墨 /
- 电导率
Abstract: A graphite ore with ultra-large flakes (ULFG) found in China (Wulate County, Inner Mongolia Autonomous Region, China), was first jaw-crushed and pneumatically separated to remove rocks, before being subjected to two froth-flotations and finally leached with NaOH and HCl to a purity of 99.9%. The purified ULFG was used to prepare exfoliated graphite by a combined chemical intercalation and rapid heating method and the latter was rolled into flexible graphite sheets of different densities. Results show that the beneficiation and purification methods preserve the graphite crystallites. The purified ULFG has a high degree of graphitization (99.9%). The volume of the ULFG-based exfoliated graphite is more than 400 mL/g, and some randomly selected individual exfoliated graphite particles are larger than 40 mm. A ULFG-based flexible graphite sheet with a density of 1.8 g/cm³ shows an excellent electrical conductivity of 2.78×10⁵ S/m.
- Ultra-large flake graphite /
- Exfoliated graphite /
- Flexible graphite sheets /
- Electrical conductivity

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参考文献(22)

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