摘要
为了确定莫桑比克某天然鳞片石墨制备可膨胀石墨的工艺条件及其性能,进行了制备工艺条件研究,并对其性能及机理进行了研究。结果表明,+0.5 mm、0.5～0.3 mm粒级鳞片石墨在HAc和HClO4与石墨的体积质量比分别为1.3 mL/g和5 mL/g,KMnO4与石墨的质量比为0.13,反应温度为50℃,反应时间为60 min条件下的可膨胀石墨在850℃的膨胀体积分别为450 mL/g,400 mL/g;0.3～0.18 mm粒级鳞片石墨在HAc和HClO4与石墨的体积质量比分别为1.3 m L/g和5 mL/g,KMnO4与石墨的质量比为0.17,反应温度为50℃,反应时间为60 min条件下的可膨胀石墨在850℃的膨胀体积为320 mL/g;不同粒级的鳞片石墨的膨胀体积受条件变化的影响大体相近,相对来说,粒度越粗,氧化插层反应的效果越好,制得的可膨胀石墨的膨胀体积也越大;经过氧化插层反应,鳞片石墨层间空隙嵌入了ClO-4和Ac-,制得的可膨胀石墨经过高温膨胀,层间空隙的ClO-4和Ac-迅速气化分解,产生的大量气体破坏了石墨层间的分子作用力,撑开了石墨片层,形成了体积大、蠕虫效果良好、具有丰富孔隙的膨胀石墨。
In order to determine the process conditions and properties for preparing expandable graphite from a natural flake graphite from Mozambique,the preparation conditions were studied,and its properties and mechanism were studied.The results show that the volume to mass ratio of HAc and HClO4 to graphite of +0.5 mm and 0.5~0.3 mm is 1.3 mL/g and 5 mL/g,the mass ratio of KMnO4 to graphite is 0.13,the reaction temperature is 50 ℃,the reaction time is 60 min,the expansion volume of expandable graphite at 850 ℃ is 450 mL/g and 400 mL/g,respectively;the volume to mass ratio of HAc and HClO4 to graphite of 0.3~0.18 mm is 1.3 mL/g and 5 mL/g,the mass ratio of KMnO4 to graphite is 0.17,the reaction temperature is 50 ℃,the reaction time is 60 min,the expansion volume of expandable graphite at 850 ℃ is 320 mL/g;the expansion volume of flake graphite of different grain sizes is roughly affected by the change of conditions,relatively speaking,the coarser the particle size,the better the effect of the oxidation intercalation reaction,and the larger the expansion volume of the produced expandable graphite;after the oxidation intercalation reaction,the gaps between the flake graphite layers are embedded with ClO-4 and Ac-,the obtained expandable graphite is expanded by high temperature,rapid gasification decomposition of ClO-4 and Ac-in inter-layer voids,and the large amount of gas generated destroys the molecular force between the graphite layers,spread the graphite sheet,formed expanded graphite with large volume,good worm effect and rich pores.
作者
钟友来
邱杨率
张凌燕
陈俐全
袁韵茹
何富超
Zhong Youlai;Qiu Yangshuai;Zhang Lingyan;Chen Liquan;Yuan Yunru;He Fuchao(School of Resources and Environmental Engineering,Wuhan University of Technology,Wuhan 430070,China;Key Liboratory of Mineral Resources Processing and Environment,Hubei Province,Wuhan 430070,China)
出处
《金属矿山》
CAS
北大核心
2019年第3期119-124,共6页
Metal Mine
关键词
鳞片石墨
石墨层间
氧化插层
可膨胀石墨
膨胀体积
Flake graphite
Graphite interlayer
Oxide intercalation
Expandable graphite
Expandable volume
