The expanded graphite was prepared by using HClO4/H3PO4/CrO3 as the oxidant and intercalation agent. The factors affecting the volume of expanded graphite were obtained by studying re-actants ratio,reaction temperature,reaction time,watered temperature,watered degree,dried temperature,expanded temperature. It was showed that m(C) : m(HClO4) :m(H3PO4) : m(CrO3) = l: 3. 0 : 1. 5 :0. 8,the reaction temperature was 45 ℃,reaction time was 70 min,the graphite was watered at 0～20 "C and stopped until its pH was 5~6,dried at 60 ℃,then expanded at 300 °C ,the volume of expanded graphite was 350 mL/g. The expanded graphite was completely expanded at 500 °C and the largest volume was 550 mL/g.%采用HClO4/H3 PO4/CrO3氧化插层体系制备低温可膨胀石墨,通过对反应物用量、反应温度及反应时间、水洗温度及水洗程度、干燥温度、膨胀温度进行研究,确定了膨胀石墨体积的影响因素.结果表明:反应物m(C)∶m(HClO4)∶m(H3PO4)∶m(CrO3)=1∶3.0∶1.5∶0.8,反应温度45℃,反应时间70 min,于0～20℃水洗至pH=5～6,在60℃干燥箱中干燥制得的可膨胀石墨,在膨胀温度300℃时,膨胀石墨体积即可达到350 mL/g.在膨胀温度500℃时,可膨胀石墨完全膨胀,最大膨胀体积550 mL/g.
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