【摘要】 用硫酸（９８％）、硝酸（６５％）和草酸的混合液与天然鳞片石墨反应制备低硫可膨胀石墨，最佳反应条件是：石墨、硫酸（９８％）、硝酸（６５％）、草酸的重量比为１∶２．３∶１．７∶０．０５，反应时间为４５ｍｉｎ，反应温度为２５℃．可膨胀石墨的含流量为１．６３％时，膨胀容积为２５０ｍＬ／ｇ，其终端产品柔性石墨的含硫量为７８０ｐｐｍ．更多还原

【Abstract】 The low sulfur expansible graphite was prepared by reacting natural flake graphite with mixing solution made from sulfuric acid(98%), nitric acid(65%) and oxalic acid. The optimum conditions for the preparation were graphite: sulfuric acid(98%): nitric acid (65%): oxalic acid =1:2.3:1.7:0.05 (by weight),25℃, 45min. The expansible graphite with expanded volume of 250m/g contains only 1.63% sulfur. The end product, flexible graphite contains only 780ppm sulfur.更多还原