工业生产SiC的副产品石墨废料的提纯

Purification Research on the Graphite from SiC Industry Byproduct

本文报道了"碱融-酸浸"法对工业生产SiC的副产品石墨废料的提纯研究,通过研究焙烧温度、焙烧时间、酸浸浓度、酸浸时间等因素对提纯效果的影响,确定了该类石墨提纯工艺的最佳条件:实验中NaOH与石墨质量比为2∶1,焙烧温度为650℃,焙烧时间为60min;室温下酸浸过程的HCl浓度为10%,酸浸时间为180min,此条件下提纯后的石墨其固定碳含量提升到98%以上。

An ＇ alkali fusion-acid leaching method was proposed to extract graphite out of the SiC industry byproduct in this paper. The technical parameters affecting the extraction results including calcination temperature, calcination time, hydrochloric acid concentration and acid leaching time were tested and optimized. And obtained were the optimum conditions such as NaOH-to-graphite mass ratio of 2： 1, alkali fusion calcination temperature of 650℃and calcination time of 60 rain. The 10 wt% HC1 solution was used as the leaching acid and the leaching time was set 180 rain. As a result, the carbon content in the extracted graphite can be uo to 98%