碱酸法制备高纯石墨试验研究  

Experimental Study on the Preparation of High Purity Graphite by Alkali-acid Method

作　　者：刘玉海[1] 李海明 LIU Yuhai;LI Haiming(Bureau of Land and Resources of Luobei County,Luobei 154200 Heilongjiang,China)

机构地区：[1]黑龙江省萝北县国土资源局,黑龙江萝北154200

出　　处：《矿产保护与利用》2018年第5期73-78,共6页Conservation and Utilization of Mineral Resources

摘　　要：以黑龙江某地细鳞片石墨浮选精矿为原料进行碱酸法提纯试验,探讨了碱酸法提纯的最佳工艺条件。研究表明:在Na OH用量3. 0 g(碱固比0. 6∶1)、焙烧温度750℃、焙烧时间40 min、浸出水用量50 m L、酸浸HCl浓度1. 0 mol/L、用量40 m L、酸浸时间40 min的条件下,通过碱熔焙烧—水浸出—酸浸的工艺可将石墨固定碳含量由95. 89%提升至99. 94%。随着反应的进行以及物相的变化,杂质最终演变成可溶性物质,以洗涤的方式被去除;水浸出过程中保持弱碱性环境,有利于硅酸钠的溶解。Experiments were carried out on a fine flaky graphite flotation concentrate in Heilongjiang Provence by alkali-acid purification method.The optimum technological parameters were investigated.The results showed that under the conditions of NaOH dosage 3.0 g(ratio of alkali to solid 0.6 GA6FA 1),roasting temperature 750℃,roasting time 40 min,leaching water dosage 50 mL,acid leaching HCl concentration 1.0 mol/L,dosage 40 mL and acid leaching time 40 min,the fixed carbon content in graphite was increased from 95.89%to 99.94%by the process of alkali fusion roasting-water leaching-acid leaching.As the reaction proceeds and the phase changes,the impurities are eventually transformed into soluble matters and are washed with pure water.Maintaining a weak alkaline environment during water leaching is beneficial to the dissolution of sodium silicate.

关 键 词：石墨 提纯 碱酸法 硅酸钠 机理 

分 类 号：TD957.2[矿业工程—选矿]