碱酸法提纯某微晶石墨

碱酸工艺是当前提纯微晶石墨的主流工艺。为确定固定碳含量为85%、粒度为0.048~0 mm、主要杂质为SiO2、Al2O3、Fe2O3等的湖南某微晶石墨提纯的合适碱酸工艺参数,对NaOH的用量、焙烧温度、焙烧时间以及HCl的用量进行了试验。结果表明,适当提高NaOH的用量、焙烧温度、焙烧时间以及HCl的用量均有利于提高微晶石墨提纯产品的固定碳含量,在NaOH与试样的质量比为0.6,焙烧温度为600℃,焙烧时间为60 min,HCl与试样体积质量比为0.4 mL/g的情况下,可获得固定碳含量为98.79%的提纯产物。

Purification of a Amorphous Graphite Using Alkali-acid Methods

The alkali-acid methods is the major process in purifying amorphous graphite.Purification experiments on dosage of NaOH,roasting time,roasting temperature and dosage of HCl are conducted to find reasonable technological parameters for a graphite with fixed canbon content of 85%,particle size from 0.048 to 0 mm and impurities of SiO₂,Al₂O₃,Fe₂O₃ etc.in Hunan province.The results show that it is benefit to increase the fixed carbon content by properly increasing dosage of NaOH,roasting time,roasting temperature and dosage of HCl.Purified product with fixed carbon content of 98.79% is obtained at the conditions of mass ratio 0.6 of NaOH to the sample,roasting temperature at 600 ℃ for 60 min and the mass ratio of HCl to sample 0.4 mL/g.