摘要
针对黑龙江省鹤岗区域天然鳞片石墨杂质类别和含量,以球形石墨(SG)为原料,采用氟盐固相法对传统碱酸法进行改进,研究了各工艺参数对提纯效果的影响,得到固定碳含量99.95%以上的球形石墨。结果表明,碱酸法在mSG∶mNaOH为10∶3,碱熔温度为450℃,时间为2 h,酸浸反应HCl浓度为3 mol/L,液固比为2∶1,时间为1 h条件下,将球形石墨的固定碳含量从94.73%提高到99.30%;采用氟盐固相法进一步提纯,在m(SG)∶m(NH_(4)HF_(2))为10∶0.5,温度为120℃,时间为2 h条件下,提纯后球形石墨固定碳含量达到99.96%。
In view of the impurity categories and contents of natural flake graphite in Hegang region of Heilongjiang Province,the traditional alkali-acid method was improved using spherical graphite(SG)as raw material by introducing the fluoride salt solid-phase method.The effects of various process parameters on the purification effeciency were investigated,obtaining spherical graphite with a fixed carbon content exceeding 99.95%.The results showed that under optimized alkali-acid conditions(mass ratio of SG to NaOH 10∶3,alkali fusion temperature 450℃for 2 h;acid leaching with 3 mol/L HCl at liquid-solid ratio 2∶1 for 1 h),the fixed carbon content of SG increased from 94.73%to 99.30%.Subsequent purification using fluoride salt solid-phase method(mass ratio of SG to NH_(4)HF_(2)10∶0.5 at 120℃for 2 h)further elevated the fixed carbon content to 99.96%.
作者
袁恒
吕冠辰
张伟君
王阳
YUAN Heng;LYU Guanchen;ZHANG Weijun;WANG Yang(Institute of Advanced Technology,Heilongjiang Academy of Sciences,Harbin 150020,China)
出处
《化学与粘合》
2025年第3期302-306,共5页
Chemistry and Adhesion
关键词
球形石墨
提纯
碱酸法
氟盐固相法
氟化氢铵
spherical graphite
alkali-acid method
fluoride salt solid phase method
ammonium bifluoride
作者简介
袁恒(1994-),男,黑龙江巴彦人,在读硕士研究生,研究方向为无机非金属;通信联系人:王阳。
