Abstract The potential of purification of natural graphite by a hydrodifluoride technology was studied by the example of treatment of deposits of the Southern Far East of Russia. It was determined that impurities contained in graphite can be nearly completely fluorinated with a 20% excess of NH 4 HF 2 . The formed complex ammonium fluoride salts and alkali metal fluorides are removed from the fluorinated concentrate by leaching with water. Treatment of the purified product with ammonium sulfate at 300–350°C gives graphite containing up to 99.9% carbon.

中文翻译：

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滨海边疆区高碳岩石生产低灰分石墨技术基础的发展

摘要 以处理俄罗斯远东南部矿床为例，研究了采用氢氟酸技术提纯天然石墨的潜力。已确定石墨中包含的杂质可以用过量20%的NH 4 HF 2 几乎完全氟化。通过用水浸出从氟化浓缩物中除去形成的复合氟化铵盐和碱金属氟化物。用硫酸铵在 300–350°C 下处理纯化产物，得到含碳高达 99.9% 的石墨。