膨胀石墨制备及其对柔性石墨抗拉强度的影响  

Preparation of Expanded Graphite and Its Effect on Tensile Strength of Flexible Graphite

作　　者：张然[1,2] 刘磊 刘岩[1,2] Zhang Ran;Liu Lei;Liu Yan(Zhengzhou Institute of Multipurpose Utilization of Mineral Resources,CAGS,Zhengzhou,Henan 450006;China National Engineering Research Center for Utilization of Industrial Minerals,Zhengzhou,Henan 450006)

机构地区：[1]中国地质科学院郑州矿产综合利用研究所,河南郑州450006 [2]国家非金属矿资源综合利用工程技术研究中心,河南郑州450006

出　　处：《非金属矿》2021年第3期60-63,共4页Non-Metallic Mines

基　　金：中国地质调查局地质调查项目(DD20190186)。

摘　　要：以莫桑比克某鳞片石墨为原料,采用层压粉碎-分质分选工艺提纯,筛选+0.30 mm精矿制备膨胀石墨。结果表明,一次插层采用硫酸-过氧化氢氧化插层工艺;二次插层最佳条件:鳞片石墨10 g,KMnO4与石墨质量比为3∶10,冰乙酸44 mL,硝酸6 mL,反应温度20℃,反应时间2 h。制得的膨胀石墨膨胀容积为420 mL/g,碎屑率为1.8%,压制成的柔性石墨抗拉强度为10.28 MPa。The expanded graphite was prepared by using+0.30 mm flotation concentrate of flake graphite from Mozambique,applying particle bed breakage-grading separation technology.The results showed that the flake graphite was oxidized and intercalated by sulfuric acid and hydrogen peroxide in the first step;the optimum conditions in the second step were that flake graphite was 10 g,mass ratio of potassium permanganate to graphite was 3∶10,glacial acetic acid was 44 mL,nitric acid was 6 mL,reaction temperature was 20℃,reaction time was 2 hours.The expanded volume of expanded graphite was 420 mL/g,the debris rate was 1.8%,and the tensile strength of the flexible graphite was 10.28 MPa.

关 键 词：膨胀石墨 柔性石墨 膨胀容积 碎屑率 抗拉强度 

分 类 号：TQ127.1[化学工程—无机化工]