隐晶质石墨酸浸提纯试验

Experiment of Acid Leaching Purification for Aphianitic Graphite

试验首先分析了黑龙江鸡西某矿生产的隐晶质石墨浮选精矿中的杂质,并根据石墨中杂质的理化性能,采用先对隐晶质石墨进行单独焙烧再进行碱浸、酸浸的提纯方法进行提纯。试验结果表明,在酸浸条件不变的情况下,使用先焙烧活化再提纯的方法可将石墨的固定碳含量由原来的84.173%提高至92.838%。为继续提高隐晶质石墨的固定碳含量,主要研究酸浸条件对该方法提纯效果的影响,选用价廉易得的盐酸为浸出酸,通过改进、优化酸浸条件,确定较佳酸浸条件为:HCl体积15mL,HCl浓度1.5 mol/L,酸浸温度80℃,酸浸时间30min。在此条件下,取得隐晶质石墨固定碳含量从84.173%提高至94.498%的良好指标。

The impurities in the flotation concentrate of aphianitic graphite produced from a Jixi ore in Heilongjiang were analyzed. According to the physicochemical properties of graphite impurities, first the method of the separate roasting was adopted for purification and then alkali and acid leaching. The results showed that in the same condi- tion of acid leaching the fixed carbon content was improved from 84. 173% to 92. 838%. In order to improve the fixed carbon content of cryptocrystalline graphite, the effect of acid leaching condition on graphite purification was studied in this paper. The cheap hydrochloric acid was selected as leaching acid. Through optimization of the acid leaching condition,the leaching condition was HCl volume as 15mL, HCl concentration as 1.5mol/L,leaching tem- perature as 80℃ and leaching time as 30min. Under this condition, the fixed carbon content of aphanitic graphite was improved from 84. 173% to 94. 498%