大田细鳞片石墨的提纯试验研究

Study on Purification of the Finely Squamose Graphite from Datian County

以福建大田县产细鳞片石墨(含碳量为90.94%)为原料,采用碱酸法对其进行提纯实验研究,并分析了各工艺因素对提纯效果的影响。最佳工艺条件为:碱熔过程中焙烧温度600℃,时间90min,NaOH溶液浓度38%,NaOH/石墨质量比26.8%;酸浸过程中酸浸温度70℃,酸浸时间120min,盐酸浓度10%,HCl/石墨质量比3.84,在此条件下所制得的石墨固定碳含量达到98.74%。

With the finely squamose graphite produced in Datian County（carbon content 90.94%） as raw materials, study on purification of finely squamose graphite through alkali fusion and acid leaching approach was carried out, and process factors on purifying effect were invertigated. The optimum process conditions were as follows： alkali fusion temperature 600℃, time 90min, NaOH concentration 38%, NaOH-to-graphite ratio 26.8%; acid leaching temperature 70℃, time 120min, HCl concentration 10%, HCl-to-graphite ratio 3.84. In this condition the content of C in the finely squamose graphite can reach 98.74 %.