QCM-D研究油酸钠浮选体系浮选药剂与磁铁矿的吸附机理
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摘要
为了研究磁铁矿在反浮选过程中与药剂的吸附作用,分别在自然和强碱性两种pH值条件下,依次加入蒸馏水、氢氧化钠、淀粉、氧化钙、油酸钠和蒸馏水,应用具有耗散因子功能的石英晶体微天平(QCM-D)研究了它们在磁铁矿表面的吸附特性.结果表明:自然pH值条件下,淀粉会轻微吸附在磁铁矿表面,Ca~(2+)会大量吸附于磁铁矿表面,加入油酸钠溶液会对Ca~(2+)有一定的脱附作用,油酸钠分子和离子缔合物会吸附在Ca~(2+)活化后的磁铁矿表面,添加药剂之后的磁铁矿表面疏水;在强碱性条件下,淀粉会轻微吸附在磁铁矿表面,CaOH~+和Ca(OH)_2(aq)会大量吸附于磁铁矿表面,油酸根离子对吸附CaOH~+和Ca(OH)_2(aq)的磁铁矿表面没有吸附作用,添加药剂之后的磁铁矿表面亲水.吸附机理研究结果证明在自然pH值条件下可以实现磁铁矿的正浮选,在强碱性条件下可以实现磁铁矿的反浮选,这与浮选试验数据和工业实践完全一致.
In order to study the adsorption of flotation chemicals on magnetite, distilled water, sodium hydroxide, starch, calcium oxide, sodium oleate, and distilled water were sequentially added at natural pH and strongly alkaline conditions, respectively. The quartz crystal microbalance(QCM-D) with dissipation was employed to study the adsorption characteristics of flotation reagents on the magnetite surface. The results have shown that sodium hydroxide and starch slightly while Ca~(2+) substantially adsorbe on the surface of magnetite under natural pH conditions. The addition of sodium oleate solution has a certain desorption effect on Ca~(2+). Sodium oleate molecules and its ionic associates are adsorbed on the surface of magnetite activated by Ca~(2+), rendering the surface of magnetite hydrophobic. Under strongly alkaline conditions, sodium hydroxide and starch are slightly adsorbed on the surface of magnetite. CaOH~+ and Ca(OH)_(2(aq)) are adsorbed on the surface of magnetite in large quantities. Oleate ions show no adsorption on the surface of magnetite with adsorbed CaOH~+ and Ca(OH)_(2(aq)), and magnetite surface remains hydrophilic. The adsorption results have indicated that direct and reverse floatation of magnetite can be achieved under natural pH and strongly alkaline conditions, respectively, which is consistent with laboratory flotation results and industrial flotation practices.
In order to study the adsorption of flotation chemicals on magnetite, distilled water, sodium hydroxide, starch, calcium oxide, sodium oleate, and distilled water were sequentially added at natural pH and strongly alkaline conditions, respectively. The quartz crystal microbalance(QCM-D) with dissipation was employed to study the adsorption characteristics of flotation reagents on the magnetite surface. The results have shown that sodium hydroxide and starch slightly while Ca~(2+) substantially adsorbe on the surface of magnetite under natural pH conditions. The addition of sodium oleate solution has a certain desorption effect on Ca~(2+). Sodium oleate molecules and its ionic associates are adsorbed on the surface of magnetite activated by Ca~(2+), rendering the surface of magnetite hydrophobic. Under strongly alkaline conditions, sodium hydroxide and starch are slightly adsorbed on the surface of magnetite. CaOH~+ and Ca(OH)_(2(aq)) are adsorbed on the surface of magnetite in large quantities. Oleate ions show no adsorption on the surface of magnetite with adsorbed CaOH~+ and Ca(OH)_(2(aq)), and magnetite surface remains hydrophilic. The adsorption results have indicated that direct and reverse floatation of magnetite can be achieved under natural pH and strongly alkaline conditions, respectively, which is consistent with laboratory flotation results and industrial flotation practices.
引文
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[15] 林园,黄庆荣,苏朝晖.QCM-D研究蛋白质与多糖的相互作用[J].应用化学,2010,27(5):505-509.LIN Yuan,HUANG Qingrong,SU Zhaohui.Interaction between protein and polysaccharide studied by QCM-D[J].Chinese Journal of Applied Chemistry,2010,27(5):505-509.
[16] 罗溪梅.含碳酸盐铁矿石浮选体系中矿物的交互影响研究[D].沈阳:东北大学,2014:42-53.LUO Ximei.Research on interactive effect among minerals in flotation system of carbonate-containing iron ore[D].Shenyang:Northeastern University,2014:42-53.
[2] 寇珏,郭玉,孙体昌,等.2种阴离子捕收剂在石英表面的吸附机理[J].中南大学学报(自然科学版),2015,46(11):4005-4014.KOU Jue,GUO Yu,SUN Tichang,et al.Adsorption mechanism of two different anionic collectors on quartz surface[J].Journal of Central South University (Science and Technology),2015,46(11):4005-4014.
[3] 孙体昌,寇珏,Daniel Tao,等.精炼塔尔油在磷酸盐浮选中的应用及QCM -D吸附研究[J].北京科技大学学报,2010,32(11):1393-1399.SUN Tichang,KOU Jue,Daniel Tao,et al.Phosphate flotation and QCM-D adsorption study of refined tall oil[J].Journal of University of Science and Technology Beijing,2010,32(11):1393-1399.
[4] 寇珏,杨葆华,徐世红,等.十二烷基磺酸钠在赤铁矿表面吸附动力学[J].工程科学学报,2016,38(10):1359-1368.KOU Jue,YANG Baohua,XU Shihong,et al.Adsorption kinetics of sodium dodecyl sulfonate onto hematite[J].Chinese Journal of Engineering,2016,38(10):1359-1368.
[5] 张兆元.赤铁矿阴离子反浮选体系药剂作用机理与抑制剂研究[D].沈阳:东北大学,2010:96-97.ZHANG Zhaoyuan.Study on mechanism of reagents in anionic reverse flotation system of hematite and depressants[D].Shenyang:Northeastern University,2010:96-97.
[7] LUO Ximei,YIN Wanzhong,WANG Yunfan,et al.Effect and mechanism of siderite on reverse anionic flotation of quartz from hematite[J].Journal of Central South University,2016,23(1):52-58.
[8] LUO Ximei,YIN Wanzhong,WANG Yunfan,et al.Effect and mechanism of dolomite with different size fractions on hematite flotation using sodium oleate as collector[J].Journal of Central South University,2016,23(3):529-534.
[9] LUO Ximei,WANG Yunfan,WEN Shuming,et al.Effect of carbonate minerals on quartz flotation behavior under conditions of reverse anionic flotation of iron ores[J].International Journal of Mineral Processing,2016,152:1-6.
[10] LUO Ximei,WANG Yunfan,SUN Chuanyao,et al.Improved flotation performance of hematite fines by using cirtic acid as a dispersant[J].International Journal of Minerals Metallurgy and Materials,2016,23(10):1119-1125.
[11] LUO Ximei,WANG Yunfan,MA Mingze,et al.Role of dissolved mineral species in quartz flotation and siderite solubility simulation[J].Physicochemical Problems of Mineral Processing,2017,53(2):1241-1254.
[12] KEITH QUAST.Direct measurement of oleate adsorption on hematite and its consequences for fotation[J].Minerals Engineering,2018,118:122-132.
[13] 陈达,葛英勇.改性淀粉对石英-磁铁矿浮选体系的影响[J].矿产综合利用,2016(6):12-15.CHEN Da,GE Yingyong.Effect of modified starch on flotation system of silica-magnetite[J].Multipurpose Utilization of Mineral Resources,2016(6):12-15.
[14] 覃文庆,邹松,刘三军,等.油酸钠浮选菱锰矿的溶液化学机理研究[J].武汉理工大学学报,2014,36(7):124-129.QIN Wenqing,ZHOU Song,LIU Sanjun,et al.Solution chemistry mechanism of flotation of sodium oleate on rhodochrosite[J].Journal of Wuhan University of Technology,2014,36(7):124-129.
[15] 林园,黄庆荣,苏朝晖.QCM-D研究蛋白质与多糖的相互作用[J].应用化学,2010,27(5):505-509.LIN Yuan,HUANG Qingrong,SU Zhaohui.Interaction between protein and polysaccharide studied by QCM-D[J].Chinese Journal of Applied Chemistry,2010,27(5):505-509.
[16] 罗溪梅.含碳酸盐铁矿石浮选体系中矿物的交互影响研究[D].沈阳:东北大学,2014:42-53.LUO Ximei.Research on interactive effect among minerals in flotation system of carbonate-containing iron ore[D].Shenyang:Northeastern University,2014:42-53.