煤泥浮选中Ca^(2+)吸附对高岭土和石英抑制作用的研究  

Study on Ca^(2+)adsorption inhibition of kaolin and quartz in coal slime flotation

作　　者：杜瑞康 庹必阳[1,2] 顾点发 王建丽 聂光华[1,2] 唐云[1,2] DU Ruikang;TUO Biyang;GU Dianfa;WANG Jianli;NIE Guanghua;TANG Yun(School of Mining,Guizhou University,550025 Guiyang,China;National and Local Joint Laboratory of Engineering for Effective Utilization of Regional Mineral Resources form Karst Areas,550025 Guiyang,China;College of Material and Advanced Manufacturing,Hunan University of Technology,412000 Zhuzhou,China;Panzhou Xiangyu Songshan Resources Recovery Company Limited,553537 Panzhou,China)

机构地区：[1]贵州大学矿业学院,贵阳550025 [2]喀斯特地区优势矿产资源高效利用国家地方联合工程实验室,贵阳550025 [3]湖南工业大学材料与先进制造学院,湖南株洲412000 [4]盘州市翔宇松山资源回收有限公司,贵州盘州553537

出　　处：《煤炭转化》2023年第3期92-99,共8页Coal Conversion

基　　金：国家自然科学基金资助项目(51464007);贵州省科技计划项目([2021]一般482)。

摘　　要：为探清Ca^(2+)对煤泥中其他杂质矿物的抑制作用,改善浮选效果,采用CaCl_(2)为抑制剂,柴油为捕收剂,松醇油起泡剂,探索实验得到柴油和松醇油最佳用量分别为1000 g/t和300 g/t。利用煤泥浮选和人工混合矿浮选考察了Ca^(2+)对煤泥中高岭土和石英的抑制效果,浮选实验均采用单元浮选实验流程,人工混合矿为4 g纯煤与1 g高岭土或1 g石英的混合矿。浮选实验开始前矿浆中分别加入0 mmol/L,2 mmol/L,4 mmol/L,6 mmol/L,8 mmol/L,10 mmol/L的CaCl_(2)溶液。结果显示:煤泥浮选中Ca^(2+)浓度由0 mmol/L增加到4 mmol/L时,可燃体回收率增加了8.24%,抑制效果明显,Ca^(2+)浓度大于4 mmol/L时,精煤灰分含量显著提高,不利于浮选;纯煤与高岭土混合矿浮选时,随着Ca^(2+)浓度增加,可燃体回收率一直保持稳定上升趋势,回收率从87.16%增加至96.18%;纯煤与石英混合矿浮选时,Ca^(2+)浓度增加到4 mmol/L后,可燃体回收率在91%上下波动且精煤灰分含量开始明显增加;通过粒度分析、Zeta电位测试研究Ca^(2+)吸附对高岭土和石英抑制机理,发现Ca^(2+)浓度由0 mmol/L增加到10 mmol/L时,高岭土粒径和石英粒径分别增加了0.71μm和0.84μm,高岭土和石英Zeta电位绝对值分别降低了10.57 mV和7.98 mV,矿物颗粒之间静电斥力减弱,更易聚集;浓度适中的Ca^(2+)对高岭土和石英抑制效果较好,浓度过低的Ca^(2+)对高岭土和石英抑制效果不明显,浓度过高的Ca^(2+)会导致煤泥浮选选择性降低,精煤灰分含量升高,浮选效果变差。In order to investigate the inhibitory effect of Ca^(2+)on other impurity minerals in coal slime and improve the flotation effect,CaCl_(2) was used as an inhibitor,while diesel oil and pine oil were employed as collectors and frothers,respectively.Optimal dosages of diesel oil and pine oil are determined to be 1000 g/t and 300 g/t,respectively.Flotation experiments were conducted on both coal slime and artificially mixed ores to evaluate the inhibitory effect of Ca^(2+)on kaolin and quartz in the coal slime.The flotation process followed a single-cell flotation test procedure,and the artificially mixed ore contained 4 g of pure coal mixed with 1 g of kaolin or 1 g of quartz.Prior to commencing the flotation experiment,CaCl_(2) solutions with concentrations of 0 mmol/L,2 mmol/L,4 mmol/L,6 mmol/L,8 mmol/L,10 mmol/L were added to the slurry.The results show that when the Ca^(2+)concentration in coal slime flotation increases from 0 mmol/L to 4 mmol/L,the recovery rate of combustibles increases by 8.24%,signifying a significant inhibitory effect.However,an increase in the Ca^(2+)concentration above 4 mmol/L results in an obvious increase in the ash content,which is not conducive to flotation;when flotation is carried out on the mixed ore of pure coal and kaolin,the recovery rate of combustibles increases steadily as the Ca^(2+)concentration increases,the recovery rate increases from 87.16% to 96.18%;in terms of the flotation of mixed ore containing pure coal and quartz,the recovery rate of combustibles fluctuates around 91%after the Ca^(2+)concentration increases to 4 mmol/L,and the ash content begins to increase significantly;the inhibitory mechanism was analyzed via particle size analysis and Zeta potential testing,the results show that when the Ca^(2+)concentration rises from 0 mmol/L to 10 mmol/L,the particle size of kaolin and quartz increases by 0.71μm and 0.84μm,respectively,and the absolute value of the Zeta potential of kaolin and quartz decreases by 10.57 mV and 7.98 mV,respectively.The electrostatic repu

关 键 词：煤泥浮选 CA^(2+) 抑制作用 粒度分析 ZETA电位 

分 类 号：TD943.4[矿业工程—选矿]