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

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 pur...

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Bibliographic Details
Published inNew carbon materials Vol. 34; no. 2; pp. 205 - 210
Main Authors Li, Ji-hui, Hou, Shi-yu, Su, Jia-rui, Li, Kuan, Wei, Lu-bin, Ma, Li-qiang, Shen, Wan-ci, Kang, Fei-yu, Huang, Zheng-hong
Format Journal Article
LanguageEnglish
Published Elsevier Ltd 01.04.2019
Subjects
Electrical conductivity
Exfoliated graphite
Flexible graphite sheets
Ultra-large flake graphite
Ultra-large flake graphite
Exfoliated graphite
Electrical conductivity
Flexible graphite sheets
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Summary: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.
ISSN:1872-5805
1872-5805
DOI:10.1016/S1872-5805(19)60012-0