▎ 摘　　要

NOVELTY - Preparing high-purity coal series graphite involves crushing natural coal-series graphite and pressing in coal-based graphite sheet; mixing sulfuric acid salt water solution with hydrogen fluoride (HF) solution to obtain mixed solution; taking inert electrode as cathode; connecting anode and cathode with direct current power supply; soaking in electrolyte; keeping for 1-5 minutes at constant voltage + 1.5-4 Volt to obtain expanded graphite anode sheet; rising voltage to + 5-10 Volt, starting peeling off graphite-anode sheet until voltage is 0 Volt; stirring or ultrasonic processing electrolytic solution and leaving still, and washing and drying suspension liquid to obtain high-quality graphite powder. USE - Method for preparing high-purity coal series graphite used as raw material for preparing graphene from top to bottom and became hot spot in recent years. ADVANTAGE - The method enables to prepare high purity coal series graphite, which has reduced structure defect, ash removal rate, fixed carbon content, and product recovery rate of more than 80%.