▎ 摘　　要

Several-micrometer-wide at a few-nanometer-thick graphene platelets were successfully prepared from Kish graphite by simple GIC (graphite intercalation compound) via exfoliation process. High crystalline Kish graphite flakes were recovered from the steelmaking by-product using the modified beneficiation process. Sulfuric acid was served as the functional intercalating agent in the GIC formation step. XRD results revealed the stable and clear first-stage state formed in the acid-intercalated GIC. Carbon content in the recovered Kish graphite was found to influence the average thickness of prepared graphene nanoplatelets. Larger Kish graphite flakes were also beneficial to produce thin graphene platelets with the average thickness of 5 nm. (C) 2014 The Korean Society of Industrial and Engineering Chemistry. Published by Elsevier B.V. All rights reserved.