碱酸法提纯鳞片石墨的试验研究

Experimental study on purification of flake graphite by alkaline acid method

针对传统碱酸法石墨提纯度不高的问题,提出了一种利用十六烷基三甲基溴化铵(CTAB)辅助碱酸法制备高纯鳞片石墨的方法,以鸡西天然鳞片石墨浮选精矿为原料,考察碱熔焙烧温度与时间、石墨与氢氧化钠及水的质量比、酸浸盐酸用量与浓度、表面活性剂用量及时间等因素对石墨提纯效果的影响。结果表明,CTAB辅助碱酸法优于传统碱酸法制备高纯石墨,石墨固定碳质量分数由99.91%提升至99.93%。

This paper is aimed at addressing low graphite purification with traditional basic acid method and proposes hexadyl trimethyl ammonium bromide(CTAB)auxiliary basic acid method to prepare high pure scale graphite.By taking Jixi natural scale graphite flotation concentrate as raw material,the study exams the influence of factors,including the alkali melting roasting temperature and time,graphite and sodium hydroxide and water quality ratio,acid immersion hydrochloric acid dosage and concentration,surfactant dosage and time,on graphite purification effect.The results show that the CTAB assisted basic acid method is better than the conventional basic acid method to prepare high purity graphite,and the fixed carbon mass fraction of graphite increases from 99.91%to 99.93%.