坦桑尼亚某晶质石墨大鳞片保护工艺研究  

Protection Technology of Large Scale Crystalline Graphite from Tanzania

作　　者：刘磊[1,2] 孙华星 郭理想 黄俊玮 赵恒勤 LIU Lei;SUN Huaxing;GUO Lixiang;HUANG Junwei;ZHAO Hengqin(Zhengzhou Institute of Multipurpose Utilization of Mineral Resources,CAGS,Zhengzhou 450006,China;China National Engineering Research Center for Utilization of Industrial Minerals,Zhengzhou 450006,China)

机构地区：[1]中国地质科学院郑州矿产综合利用研究所,河南郑州450006 [2]国家非金属矿资源综合利用工程技术研究中心,河南郑州450006

出　　处：《矿产保护与利用》2023年第3期96-104,共9页Conservation and Utilization of Mineral Resources

基　　金：自然资源部高层次科技创新人才工程项目(121106000000180039-2210);自然资源部部门预算资助项目。

摘　　要：坦桑尼亚某晶质石墨矿固定碳含量为3.74%,鳞片粒径+147μm占比97.18%。对比了高压辊磨机和球磨机两种磨矿方式下浮选粗精矿的分质产品差异,并开展了各分质产品再磨再选试验。试验结果表明,采用层压粉碎(高压辊磨机)—分质分选新工艺效果较好,粗粒低碳分质产品单独再磨避免了脉石对粗精矿中高解离度大鳞片石墨的破坏,且碳品位提升较快,其再选精矿与中粒中碳产品合并成一个产品,与细粒高碳产品分别经两段再磨再选后,精矿碳品位均大于96%,最终获得了碳品位96.24%、回收率95.30%的精矿。层压粉碎—分质分选工艺相比常规粗精矿混目再磨再选工艺减少了五次再磨六次精选,最终精矿碳品位高1.04百分点,+0.30 mm粒级精矿产率高3.25百分点。The fixed carbon content of a crystalline graphite ore from Tanzania is 3.74%,among of which the+147μm size flake graphite accounts for 97.18%.In this paper,the different rough concentrates and further regrinding and reflotation tests between high pressure roller mill and ball mill were compared.The results showed that the effect of the new process of"particles bed comminution(high pressure roller mill)−grading and grading separation"was better.The regrinding of coarse−grained low−carbon products avoided the damage of gangue to large−scale graphite with high dissociation degree in coarse concentrate,and the carbon grade increased rapidly.Its recleaning concentrate and medium−grained medium−carbon were combined into one product,and fine−grained high−carbon products were regrinding and re−concentration in two stages respectively.The fixed carbon content of both concentrates were greater than 96%.Compared with the conventional process,"five times regrinding and six times flotation"were reduced.The final carbon grade of the concentrate was higher than 95%and the+0.15 mm particle size was about 65%in both processes.The+0.30 mm content in the new process was 3.37%higher.

关 键 词：晶质石墨 大鳞片保护 层压粉碎 分质分级 

分 类 号：TD975.2[矿业工程—选矿]