磁种团聚对细粒矿物浮选的影响（英文）
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摘要
磁种团聚(MSA),即通过向浮选矿浆中引入磁种和低强度预磁场,使细粒矿物发生团聚,然后将该团聚应用到煤泥、黄铁矿及赤铁矿细泥浮选中。通过粒度分析和浮选试验发现,磁种团聚提高了细粒浮选的回收率和黄铁矿矿泥的浮选速率,但对浮选选择性造成了一定损失;在聚丙烯酰胺和淀粉分别存在条件下,煤泥和赤铁矿细泥的团聚浮选皆得到了增强,磁种与絮凝剂之间存在着协同作用。机理分析和计算证实了磁种在矿物表面发生了吸附,该吸附降低了细粒磁种团聚所需要的临界磁场强度。原子力测试表明磁种与矿物颗粒间存在着一种长程作用力,该作用力有利于磁种在矿物颗粒上的吸附。红外分析表明,聚丙烯酰胺和淀粉在矿物和磁种表面皆发生了吸附,起到了桥联作用,强化了矿物粒子间的团聚。探讨了磁种团聚的表面特征(SEM)和吸附模型。
Magnetic seeding agglomeration(MSA), i.e., adding magnetic seeds and a low intensity pre-magnetization for fine agglomeration, was applied to the flotation of coal, pyrite and hematite ore slimes. Size analysis and flotation tests highlight that the MSA improved flotation recovery and kinetics of pyrite ore while causing some loss in selectivity, and in the presences of the polyacrylamide for coal and starch for hematite the agglomeration flotation was further strengthened due to the synergetic effect between the flocculants and magnetic seeds. Magnetism analyses and calculation confirmed the adsorption of magnetic seeds onto minerals, resulting in a decreased threshold magnetic field intensity for the MSA to happen. Then atomic force microscope(AFM) study found that there exists a long range force between magnetic seeds and minerals, which facilitates the adsorption of magnetic seeds on minerals. FTIR shows both the polyacrylamide and starch adsorbed onto minerals and magnetic seeds, thus acting as the bridging media between minerals and magnetic seeds, intensifying the agglomeration in flotation. Surface characterization of the MSA was understood by SEM imaging, and models of the MSA were proposed.
Magnetic seeding agglomeration(MSA), i.e., adding magnetic seeds and a low intensity pre-magnetization for fine agglomeration, was applied to the flotation of coal, pyrite and hematite ore slimes. Size analysis and flotation tests highlight that the MSA improved flotation recovery and kinetics of pyrite ore while causing some loss in selectivity, and in the presences of the polyacrylamide for coal and starch for hematite the agglomeration flotation was further strengthened due to the synergetic effect between the flocculants and magnetic seeds. Magnetism analyses and calculation confirmed the adsorption of magnetic seeds onto minerals, resulting in a decreased threshold magnetic field intensity for the MSA to happen. Then atomic force microscope(AFM) study found that there exists a long range force between magnetic seeds and minerals, which facilitates the adsorption of magnetic seeds on minerals. FTIR shows both the polyacrylamide and starch adsorbed onto minerals and magnetic seeds, thus acting as the bridging media between minerals and magnetic seeds, intensifying the agglomeration in flotation. Surface characterization of the MSA was understood by SEM imaging, and models of the MSA were proposed.
引文
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[33]WU Xi-qing,YANG Ping-wei,CHENG Zheng,DAI Liang.Surface magnetization of hematite by metal ions[J].Advanced Materials Research,2013,785-786:1104-1110.(in Chinese)
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[35]WU Xi-qing,XU Peng-yun,DUAN Yun-feng,HU Cong,LIGuo-ping.Surface magnetization of siderite mineral[J].International Journal of Mining Science and Technology,2012,22(6):825-830.
[36]LV Yu-ting,ZHAO Li-ying,SHI Qi-lei.The influence of magnetic field on the flocculation and sedimentation of coal slimes[J].Heilongjiang University of Science and Technology,2013(5):424-426,448.(in Chinese)
[37]SVOBODA J.A theoretical approach to the magnetic flocculation of weakly magnetic minerals[J].International Journal of Mineral Processing,1981,8(4):377-390.
[38]SVOBODA J.Magnetic flocculation and treatment of fine weakly magnetic minerals[J].IEEE Transactions on Magnetics,1982,18(2):796-801.
[39]DAI Liang.The magnetic seed-polymer agglomeration of coal slime[D].Changsha:School of Minerals Processing and Bioengineering,Central South University,2015.(in Chinese)
[40]WATSON J H P.Magnetic separation at high magnetic fields[C]//Proceedings of the Sixth International Cryogenic Engineering Conference.Grenoble:ICEC,1976.
[41]TANG M,LIU Q.The acidity of caustic digested starch and its role in starch adsorption on mineral surfaces[J].International Journal of Mineral Processing,2012,112:94-100.(Edited by HE Yun-bin)
[2]PEASE J D,CURRY D C,YOUNG M F.Designing flotation circuits for high fines recovery[J].Minerals Engineering,2006,19(6):831-840.
[3]LASKOWSKI J S,LOPEZ-VLADIVIESO A.Fine particle aggregation in mineral processing circuits[C]//Proceedings of 5th UBC-McGill-UA Symposium.Met Soc,Hamilton,Canada.2004:17-32.
[4]FORBES E.Shear,selective and temperature responsive flocculation:A comparison of fine particle flotation techniques[J].International Journal of Mineral Processing,2011,99(1):1-10.
[5]HU W B,WANG D Z,QU G Z.Autogenous carrier flotation[C]//Proceedings of International of Mineral Processing Congress,1988,16:329-335.
[6]VALDERRAMA L,RUBIO J.High intensity conditioning and the carrier flotation of gold fine particles[J].International Journal of Mineral Processing,1998,52(4):273-285.
[7]ZHU Y G,ZHANG G F,FENG Q M,LU Y P,OU L M.Autogenous-carrier flotation of fine ilmenite[J].The Chinese Journal of Nonferrous Metals,2009(3):554-560.(in Chinese)
[8]ATESOK G,BOYLU F,EL?K M S.Carrier flotation for desulfurization and deashing of difficult-to-float coals[J].Minerals Engineering,2001,14(6):661-670.
[9]LIU J,VANDENBERGHEA J,MASLIYAHA J,XU Z,YORDAN J.Fundamental study on talc-ink adhesion for talc-assisted flotation deinking of wastepaper[J].Minerals Engineering,2007,20(6):566-573.
[10]LU Y P,ZHONG H,HUANG X H.Flotation of fine wolframine flocs using polyarcylic acid as flocculant[J].Mining and Metallurgical Engineering,1994,14(1):30-33.(in Chinese)
[11]SONG S X,ZHANG X W,YANG B Q,LOPEZ-MENDOZA.Flotation of molybdenite fines as hydrophobic agglomerates[J].Separation and Purification Technology,2012,98:451-455.
[12]NG W S,SONSIE R,FORBES E,FRANKS G V.Flocculation/flotation of hematite fines with anionic temperature-responsive polymer acting as a selective flocculant and collector[J].Minerals Engineering,2015,77:64-71.
[13]RUBIO J,CAPPONI F,RODRIGUES R T,MATIOLO E.Enhanced flotation of sulfide fines using the emulsified oil extender technique[J].International Journal of Mineral Processing,2007,84(1):41-50.
[14]DUZYOLA S,OZKAN A.Role of hydrophobicity and surface tension on shear flocculation and oil agglomeration of magnesite[J].Separation and Purification Technology,2010,72(1):7-12.
[15]YIN W Z,YANG X S,ZHOU D P,LI Y J,LüZ F.Shear hydrophobic flocculation and flotation of ultrafine Anshan hematite using sodium oleate[J].Transactions of Nonferrous Metals Society of China,2011,21(3):652-664.
[16]BAKKER M G,SPEARS D R,MURPHY D D,TURNER GL.Whatever happened to shear-flocculation[J].Fluid-Particle Separation Journal,2002,14:155-168.
[17]CAPES C E,DARCOVICH K.Size enlargement[M]//Kirk-Othmer Encyclopedia of Chemical Technology.New York:John Wiley&Sons,Inc.,1997.
[18]LASKOWSKI J S,YU Z.Oil agglomeration and its effect on beneficiation and filtration of low-rank/oxidized coals[J].International Journal of Mineral Processing,2000,58(1):237-252.
[19]LI H,FRANKS G V,LI H,FRANKS G V.Role of temperature sensitive polymers in hydrophobic aggregation/flotation of silicate minerals[C]//24th Int.Minerals Processing Congress China Scientific.Beijing,China:Book Service,2008:1261-1269.
[20]FRANKS G V,LI H,O'SHEA J P,QIAO G G.Application of poly(N-isopropyl acrylamide)(PNIPAM)as a multifunction process aid in mineral flotation and solid/liquid separation[C]//24th International Minerals Processing Congress.Beijing,China:China Scientific Book Service,2008:2099-2106.
[21]FRANKS G V,LI H,O'SHEA J P,QIAO G G.Temperature responsive polymers as multiple function reagents in mineral processing[J].Advanced Powder Technology,2009,20(3):273-279.
[22]BURDUKOVA E,LI H,ISHIDA N,O'SHEA J P,FRANKSG V.Temperature controlled surface hydrophobicity and interaction forces induced by poly(N-isopropylacrylamide)[J].Journal of Colloid and Interface Science,2010,342(2):586-592.
[23]FORBES E,BRADSHAW D J,FRANKS G V.Temperature sensitive polymers as efficient and selective flotation collectors[J].Minerals Engineering,2011,24(8):772-777.
[24]AKDEMIRü,S?NMEZ I.Investigation of coal and ash recovery and entrainment in flotation[J].Fuel Processing Technology,2003,82(1):1-9.
[25]KUMAR S,RAWAT V.Froth flotation of refuse coal fines and process optimization using 2D surface plots[J].Journal of Central South University,2016,23(10):2520-2525.
[26]CUI Guang-wen,ZHANG Ji-zhu,FU Xiang-tong,CAOMeng-chang,TAN-Jing,DONG Hong-jian.Study on the influence of size composition on the flotation of coal[J].Coal Preparation Technology,2007(4):20-22.(in Chinese)
[27]LITTLEFAIR M J,LOWE N R S.On the selective flocculation of coal using polystyrene latex[J].International Journal of Mineral Processing,1986,17(3,4):187-203.
[28]SHAHBAZI B,REZAI B,KOLEINI S M J.Bubble-particle collision and attachment probability on fine particles flotation[J].Chemical Engineering and Processing:Process Intensification,2010,49(6):622-627.
[29]CHIPFUNHU D,ZANIN M,GRANO S.Flotation behaviour of fine particles with respect to contact angle[J].Chemical Engineering Research and Design,2012,90(1):26-32.
[30]AHMADI R,KHODADADI D A,ABDOLLAHY M,FANM.Nano-microbubble flotation of fine and ultrafine chalcopyrite particles[J].International Journal of Mining Science and Technology,2014,24(4):559-566.
[31]WU Xi-qing,DAI Chuan,DAI Liang.Magnetic seeding flotation(MSF):CN 104117432A[P].2014-7-10.(in Chinese)
[32]WU Xi-qing,XIE Xin,CAO Yang-fan.Self-magnetization of pyrite and its application in flotation[J].Transactions of Nonferrous Metals Society of China,2016,26(12):3238-3244.
[33]WU Xi-qing,YANG Ping-wei,CHENG Zheng,DAI Liang.Surface magnetization of hematite by metal ions[J].Advanced Materials Research,2013,785-786:1104-1110.(in Chinese)
[34]WU Xi-qing,CAO Yang-fan.A stirring pre-magnetizer:CN20449700OU[P].2015-7-22.(in Chinese)
[35]WU Xi-qing,XU Peng-yun,DUAN Yun-feng,HU Cong,LIGuo-ping.Surface magnetization of siderite mineral[J].International Journal of Mining Science and Technology,2012,22(6):825-830.
[36]LV Yu-ting,ZHAO Li-ying,SHI Qi-lei.The influence of magnetic field on the flocculation and sedimentation of coal slimes[J].Heilongjiang University of Science and Technology,2013(5):424-426,448.(in Chinese)
[37]SVOBODA J.A theoretical approach to the magnetic flocculation of weakly magnetic minerals[J].International Journal of Mineral Processing,1981,8(4):377-390.
[38]SVOBODA J.Magnetic flocculation and treatment of fine weakly magnetic minerals[J].IEEE Transactions on Magnetics,1982,18(2):796-801.
[39]DAI Liang.The magnetic seed-polymer agglomeration of coal slime[D].Changsha:School of Minerals Processing and Bioengineering,Central South University,2015.(in Chinese)
[40]WATSON J H P.Magnetic separation at high magnetic fields[C]//Proceedings of the Sixth International Cryogenic Engineering Conference.Grenoble:ICEC,1976.
[41]TANG M,LIU Q.The acidity of caustic digested starch and its role in starch adsorption on mineral surfaces[J].International Journal of Mineral Processing,2012,112:94-100.(Edited by HE Yun-bin)