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 HG to a purity of 99.9%. The puri...

Full description

Saved in:
Bibliographic Details
Published in:Carbon (New York) 2019-09, Vol.150, p.552-552
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: Article
Language:English
Subjects:
Beneficiation
Conductivity
Crystallites
Electrical resistivity
Flakes
Graphite
Graphitization
Heating
Organic chemistry
Sheets
Sodium hydroxide
Online Access:Get full text
Tags: Add Tag
No Tags, Be the first to tag this record!
Description
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 HG 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 ULFC-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 x 10s S/m.
ISSN:0008-6223
1873-3891
DOI:10.1016/j.carbon.2019.04.100