电化学法制造膨胀石墨的再改进  

Improvement in Electrochemical Synthesis of Expanded Graphite

作　　者：薛美玲[1] 于永良[2] 任志华[2] 张积树[2] 

机构地区：[1]天津大学材料系,天津300072 [2]青岛科技大学应用化学系,山东青岛266042

出　　处：《精细化工》2002年第10期567-570,共4页Fine Chemicals

摘　　要：运用正交实验对电化学法制备膨胀石墨过程中的影响因素进行了分析 ,得出了各因素对膨化率由强到弱的影响次序 :硫酸质量分数、电解电压、反应时间、固液质量比、氧化剂用量。筛选出了以硝酸钾为氧化剂制备可膨胀石墨的最佳工艺条件 :硝酸钾用量为m(H2 SO4 )∶m(KNO3)=2 2∶1 ;硫酸质量分数控制在 85 %左右 ;电解电压 1 8V ;反应时间 3 5h ;固液质量比为每毫升电解液中的石墨为 0 1 1～ 0 1 4g。膨化过程中的最佳温度为 850℃ ,最佳时间为 30s,膨化率可达 2 0 5mL/g。The influential factors during the process of electrochemical production of expanded graphite were investigated by orthogonal method,and the sequence of factors influencing the ratio of expansion was obtained,which was, from strong to weak,the mass fraction of sulfuric acid,the electric voltage of electrolysis,the reaction time,the mass ratio of solid to liquid(the ratio of graphite to sulfuric acid and potassium nitrate) and the content of oxidizing agent. The optimum technical parameters were determined,namely, potassium nitrate used as oxidizing agent, m (H 2SO 4)∶ m (KNO 3)=22∶1,the concentration of sulfuric acid approximately 85%,voltage of electrolysis 1 8 V,electrolysis time 3 5 h and the weight ratio of solid to liquid (0 11-0 14) g/mL.In the expansion process,both the temperature and the expansion time played key roles,which had direct influence on the quality of the product.The optimum conditions of expansive process were determined that the temperature was 850 ℃or so,and the time was 30 s.The ratio of expansion was up to 205 mL/g.

关 键 词：电化学法 制造 膨胀石墨 改进 石墨插层 

分 类 号：TQ165[化学工程—高温制品工业]