石墨晶体结构与浮选速率的关系研究  

Study on the Relationship Between Graphite Crystal Structure and Flotation Rate

作　　者：魏少巍 张凌燕[1,2] 邱杨率[1,2] 丁大发 刘淮亮 WEI Shaowei;ZHANG Lingyan;QIU Yangshuai;DING Dafa;LIU Huailiang(School of Resources and Environmental Engineering,Wuhan University of Technology,Wuhan 430070,China;Hubei Key Laboratory of Mineral Resources Processing and Environment,Wuhan 430070,China)

机构地区：[1]武汉理工大学资源与环境工程学院,湖北武汉430070 [2]矿物资源加工与环境湖北省重点实验室,湖北武汉430070

出　　处：《金属矿山》2021年第11期104-109,共6页Metal Mine

摘　　要：石墨晶体结构特征与其浮选速率的关系研究具有重要的意义,针对莫桑比克、湖北宜昌、吉林汪清等10个来源的石墨精矿开展了接触角测试、晶体结构特征分析及浮选速率试验。结果表明:①大鳞片石墨和致密晶质石墨普遍具有相对较大的接触角,而细鳞片石墨和隐晶质石墨一般接触角相对较小。②各石墨精矿中石墨晶体轴长a_(0)范围为0.24651~0.24827 nm,c_(0)范围为0.67129~0.67568 nm,晶胞体积V范围为0.03533~0.03599 nm^(3),石墨化度范围为68.78%~94.57%;大鳞片石墨晶胞体积更小,晶体结构更完整,石墨化度更高,细鳞片石墨及隐晶质石墨晶体结构边缘接入了较多含氧官能团,晶体缺陷更多,石墨化度更低;石墨晶体中3R多型含量与其石墨化度成负相关。③石墨精矿浮选速率符合经典一级动力学模型;石墨化度与浮选速率成正相关,石墨化度越高的石墨,其浮选速率越快,精矿固定碳含量越高;大鳞片石墨一般具有较高的石墨化度,其浮选速率较细鳞片石墨及隐晶质石墨快,因此其精矿固定碳含量较高。The study on the relationship between graphite crystal structure characteristics and flotation rate is of great significance.The contact angle test,crystal structure characteristics analysis and flotation rate test were carried out for graphite concentrates from Mozambique,Hubei Yichang,Jilin Wangqing and so on.The results showed that:①Large flaky graphite and dense crystalline graphite generally have relatively large contact angles,while fine flaky graphite and aphanitic graphite generally have relatively small contact angles.②The axial length a_(0) and c_(0) of graphite crystal in various graphite concentrates ranges from 0.24651 to 0.24827 nm and 0.67129 to 0.67568 nm respectively.The cell volume V ranges from 0.03533 to 0.03599 nm^(3),and the graphitization degree ranges from 68.78%to 94.57%.The large flaky graphite is with smaller cell volum,more complete crystal structure and higher graphitization degree.While the edge of the fine flaky graphite and aphanitic graphite crystal structure is connected with more oxygen-containing functional groups,and showed more crystal defects and lower graphitization degree.There is a negative correlation between content of 3R-polytypic and graphitization degree in graphite crystals.③The flotation rate of graphite concentrate accords with the classical first-order kinetic model.The graphitization degree is positively correlated with the flotation rate.The higher the graphitization degree is,the faster the flotation rate is and the higher the fixed carbon content of the concentrate is.Large flaky graphite generally has a higher degree of graphitization,and its flotation rate is faster than fine flaky graphite and aphanitic graphite,so its concentrate has a higher fixed carbon contents.

关 键 词：接触角测试 晶胞体积 石墨化度 3R多型含量 浮选速率 

分 类 号：TD97[矿业工程—选矿]