超声波强化氧化磁黄铁矿浮选的机理研究
|
摘要
为探讨超声波强化氧化后磁黄铁矿浮选的机理,通过单矿物浮选试验、超声波溶解试验、X光电子能谱表面检测分析、动电位测定和捕收剂在磁黄铁矿表面的吸附量检测,研究了超声波对被氧化后磁黄铁矿表面溶解、表面性质及可浮性的影响,并对其机理进行分析。结果表明:超声波能促进磁黄铁矿表面氧化物的溶解,超声波作用后磁黄铁矿表面富铁贫硫氧化层中FeOOH、Fe_2(SO_4)_3溶解,暴露出富硫贫铁表面及部分新鲜磁黄铁矿表面,进一步超声处理不会改变磁黄铁矿表面性质;超声波作用后磁黄铁矿零电点负移,疏水性增强,提高了被捕收剂吸附的概率;超声波能改善磁黄铁矿浮选指标,且过度超声不会对浮选产生不利影响。试验结果对超声强化表面被氧化的硫化矿浮选具有重要的指导意义。
In order to investigate the flotation mechanism of the oxidized pyrrhotite treated by ultrasonic,the surface property,surface dissolution and the flotation behavior of oxidized pyrrhotite were investigated through flotation experiments,ultrasonic dissolution experiments,X-ray photoelectron spectroscopy,Zeta potential measurements and collector adsorption testing. The results show that ultrasonic can promote the dissolution of the oxides. Treated by ultrasonic,iron oxides such as FeOOH,Fe_2(SO_4)_3 are dissolved,making the surface rich in sulfur as well as small part of fresh pyrrhotite surface exposed. Further ultrasonic treatment won't change the surface property. After treated by ultrasonic,the point of Zero charge shift towards the negative direction. The pyrrhotite become more hydrophobic,making the collector more easily adsorb on its surface and promoting the flotation behavior of pyrrhotite. There is no bad effect even treated by excessive ultrasonic. The results may provide additional insights into the flotation improvement of the oxidized sulfide minerals by ultrasonic.
In order to investigate the flotation mechanism of the oxidized pyrrhotite treated by ultrasonic,the surface property,surface dissolution and the flotation behavior of oxidized pyrrhotite were investigated through flotation experiments,ultrasonic dissolution experiments,X-ray photoelectron spectroscopy,Zeta potential measurements and collector adsorption testing. The results show that ultrasonic can promote the dissolution of the oxides. Treated by ultrasonic,iron oxides such as FeOOH,Fe_2(SO_4)_3 are dissolved,making the surface rich in sulfur as well as small part of fresh pyrrhotite surface exposed. Further ultrasonic treatment won't change the surface property. After treated by ultrasonic,the point of Zero charge shift towards the negative direction. The pyrrhotite become more hydrophobic,making the collector more easily adsorb on its surface and promoting the flotation behavior of pyrrhotite. There is no bad effect even treated by excessive ultrasonic. The results may provide additional insights into the flotation improvement of the oxidized sulfide minerals by ultrasonic.
引文
[1]Rocha L,Can?ado R Z L,Peres A E C.Iron ore slimes flotation[J].Minerals Engineering,2010(23):842-845.
[2]Becker M,Villiers J D,Bradshaw D.The flotation of magnetic and non-magnetic pyrrhotite from selected nickel ore deposits[J].Minerals Engineering,2010(23):1045-1052.
[3]Pan Hanjiang,Zhou Guohua,Cheng Zhizhong,et al.Advances in geochemical survey of mine tailings project in China[J].Journal of Geochemical Exploration,2014(9):193-200.
[4]Pratt A R.The Low Temperature Surface Geochemistry and Kinetics of Pyrrhotite Weathering:Influence on Acid Mine Drainage(AMD)[D].Ontario:University of Western Ontario,1995.
[5]Pratt A R,Muir I J,Nesbitt H W.X-ray photoelectron and Auger electron spectroscopic studies of pyrrhotite and mechanism of air oxidation[J].Geochimica et Cosmochimica Acta,1994(5):827-841.
[6]Niemczewski B.Cavitation intensity of water under practical ultrasonic cleaning conditions[J].Ultrasonics Sonochemistry,2014(21):354-359.
[7]张明超.超声清洗影响因素与空化场研究[D].西安:陕西师范大学,2013.Zhang Mingchao.Study on Influencing Factors in Ultrasonic Cleaning and Cavitation Field[D].Xi’an:Shaanxi Normal University,2013.
[8]?zkan?G,Kuyumcu H Z.Design of a flotation cell equipped with ultrasound transducers to enhance coal flotation[J].Ultrasonics Sonochemistry,2007(14):639-645.
[9]M·密斯拉,谭程鹏,李长根.超声波预处理改善毒砂浮选[J].国外金属矿选矿,2004(1):35-38·.Mystra M,Tan Chengpeng,Li Changgen.The improvement of arsenopyrite flotation by ultrasonic pretreatment[J].Metallic Ore Dressing Abroad,2004(1):35-38.
[10]陈经华,孙传尧.超声波清洗对方铅矿、闪锌矿和黄铁矿可浮性的影响[J].矿冶,2005(14):13-16.Chen Jinghua,Sun Chuanyao.Effect of ultrasonic cleaning on floatability of galena,sphalerite and pyrite[J].Mining and Metallurgy,2005(14):13-16.
[11]Clarke P,Fornasiero D,Ralston J,et al.A study of the removal of oxidation products from sulfide mineral surfaces[J].Minerals Engineering,1995(8):1347-1357.
[12]Newell A J H,Bradshaw D J,Harris P J.The effect of heavy oxidation upon flotation and potential remedies for Merensky type sulfides[J].Minerals Engineering,2006(19):675-686.
[13]Miller J D,Li J,Davidtz J C,et al.A review of pyrrhotite flotation chemistry in the processing of PGM ores[J].Minerals Engineering,2005(18):855-865.
[14]Janzen M P,Nicholson R V,Scharer J M.Pyrrhotite reaction kinetics:reaction rates for oxidation by oxygen,ferric iron,and for nonoxidative dissolution[J].Geochimica et Cosmochimica Acta,2000(64):1511-1522.
[15]Brion D.Etude par spectroscopie de photoelectrons de la degradation superficielle de FeS2,CuFeS2,ZnS et PbS a l'air et dansl'eau[J].Applications of Surface Science,1980(5):133-152.
[16]Barr T L.An ESCA study of termination of the passivation of elemental metals[J].The Journal of Physical Chemistry,1978(82):1801-1810.
[17]Nesbitt H W,Muir I J.X-ray photoelectron spectroscopic study of a pristine pyrite surface reacted with water vapour and air[J].Geochimica et Cosmochimica Acta,1994(58):4667-4680.
[2]Becker M,Villiers J D,Bradshaw D.The flotation of magnetic and non-magnetic pyrrhotite from selected nickel ore deposits[J].Minerals Engineering,2010(23):1045-1052.
[3]Pan Hanjiang,Zhou Guohua,Cheng Zhizhong,et al.Advances in geochemical survey of mine tailings project in China[J].Journal of Geochemical Exploration,2014(9):193-200.
[4]Pratt A R.The Low Temperature Surface Geochemistry and Kinetics of Pyrrhotite Weathering:Influence on Acid Mine Drainage(AMD)[D].Ontario:University of Western Ontario,1995.
[5]Pratt A R,Muir I J,Nesbitt H W.X-ray photoelectron and Auger electron spectroscopic studies of pyrrhotite and mechanism of air oxidation[J].Geochimica et Cosmochimica Acta,1994(5):827-841.
[6]Niemczewski B.Cavitation intensity of water under practical ultrasonic cleaning conditions[J].Ultrasonics Sonochemistry,2014(21):354-359.
[7]张明超.超声清洗影响因素与空化场研究[D].西安:陕西师范大学,2013.Zhang Mingchao.Study on Influencing Factors in Ultrasonic Cleaning and Cavitation Field[D].Xi’an:Shaanxi Normal University,2013.
[8]?zkan?G,Kuyumcu H Z.Design of a flotation cell equipped with ultrasound transducers to enhance coal flotation[J].Ultrasonics Sonochemistry,2007(14):639-645.
[9]M·密斯拉,谭程鹏,李长根.超声波预处理改善毒砂浮选[J].国外金属矿选矿,2004(1):35-38·.Mystra M,Tan Chengpeng,Li Changgen.The improvement of arsenopyrite flotation by ultrasonic pretreatment[J].Metallic Ore Dressing Abroad,2004(1):35-38.
[10]陈经华,孙传尧.超声波清洗对方铅矿、闪锌矿和黄铁矿可浮性的影响[J].矿冶,2005(14):13-16.Chen Jinghua,Sun Chuanyao.Effect of ultrasonic cleaning on floatability of galena,sphalerite and pyrite[J].Mining and Metallurgy,2005(14):13-16.
[11]Clarke P,Fornasiero D,Ralston J,et al.A study of the removal of oxidation products from sulfide mineral surfaces[J].Minerals Engineering,1995(8):1347-1357.
[12]Newell A J H,Bradshaw D J,Harris P J.The effect of heavy oxidation upon flotation and potential remedies for Merensky type sulfides[J].Minerals Engineering,2006(19):675-686.
[13]Miller J D,Li J,Davidtz J C,et al.A review of pyrrhotite flotation chemistry in the processing of PGM ores[J].Minerals Engineering,2005(18):855-865.
[14]Janzen M P,Nicholson R V,Scharer J M.Pyrrhotite reaction kinetics:reaction rates for oxidation by oxygen,ferric iron,and for nonoxidative dissolution[J].Geochimica et Cosmochimica Acta,2000(64):1511-1522.
[15]Brion D.Etude par spectroscopie de photoelectrons de la degradation superficielle de FeS2,CuFeS2,ZnS et PbS a l'air et dansl'eau[J].Applications of Surface Science,1980(5):133-152.
[16]Barr T L.An ESCA study of termination of the passivation of elemental metals[J].The Journal of Physical Chemistry,1978(82):1801-1810.
[17]Nesbitt H W,Muir I J.X-ray photoelectron spectroscopic study of a pristine pyrite surface reacted with water vapour and air[J].Geochimica et Cosmochimica Acta,1994(58):4667-4680.