【摘要】 以青海都兰某微晶石墨浮选精矿为原料,通过高温焙烧制备高纯石墨。利用XRF、XRD、SEM-EDS等分析原料成分、物相、形貌,系统考查焙烧温度与时间对石墨含碳量和回收率的影响。以含碳量为目标优化了焙烧时间、NaOH/石墨配料比、盐酸浓度、酸浸温度、酸浸时间等参数。结果表明,焙烧温度1 000℃,焙烧时间为20 min,NaOH与石墨矿的质量比为0.75,盐酸浓度为0.6 mol/L,酸浸温度为40℃,酸浸时间为60 min条件下,固定碳含量提高到99.898%,回收率为64.32%。高温碱熔酸浸法是用微晶石墨制备高纯石墨的有效方法,为微晶石墨的高效利用开辟新途径。更多还原

【Abstract】 A high purity graphite was prepared by high temperature calcination for a microcrystalline graphite flotation concentrate from Dulan in Qinghai province. Based on XRF, SEM and XRD analysis, the effects of calcination temperature and time on the carbon content and recovery of graphite were investigated. The parameters including the calcination time, NaOH/graphite ratio, hydrochloric acid concentration, acid leaching temperature, acid leaching time and other parameters were optimized with carbon content. The experimental data show that a high purity graphite with the fixed carbon content of 99.898% and the recovery rate of 64.32% was obtained at the calcination temperature of 1 000 ℃, the calcination time of 20 min, the ratio of NaOH to graphite of 0.75, the concentration of hydrochloric acid of 0.6 mol/L, the acid leaching temperature of 40 ℃, and the time of acid leaching of 60 min. High temperature alkali fused acid leaching is an effective method for the preparation of high purity graphite from microcrystalline graphites, which develops a new way for the efficient use of microcrystalline graphite.更多还原