碱酸法制备高纯石墨试验研究

Study on Preparation of High Purity Graphite by Alkali-Acid Process

以黑龙江鹤岗某地石墨精粉为原料,采用碱酸法工艺进行高纯石墨制备试验研究。结果表明,碱酸法工艺可以有效去除石墨精粉中的石英、云母等杂质矿物,从而进一步提高固定碳含量;在NaOH用量为500 g/t,煅烧温度为700℃,煅烧时间为1.0 h,HCl用量为1500 g/t,酸浸温度为80℃,酸浸时间为4 h的条件下,可以获得产率为87.20%、固定碳含量为99.92%的提纯产品,达到GB/T 3518-2008《鳞片石墨》标准中高纯石墨的要求。

The preparation of high purity graphite was studied by alkali-acid process with graphite from Hegang,Heilongjiang.The results show that the alkali-acid process could effectively remove lode minerals such as quartz and mica in the graphite,and increase the fixed carbon content.Under the conditions of NaOH dosage of 500 g/t,calcination temperature of 700℃,calcination time of 1.0 h,HCl dosage of 1500 g/t,acid leaching temperature of 80℃and acid leaching time of 4 h,purified products with yield of 87.20%and fixed carbon content of 99.92%could be obtained,which meet high purity graphite standard of GB/T 3518-2008"Flake graphite".