自然氧化对黄铁矿可浮性的影响及其机理研究
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摘要
为了弄清黄铁矿在自然条件下的氧化规律及黄铁矿表面氧化对浮选的影响。研究了自然氧化条件下氧化时间对黄铁矿单矿物可浮性的影响,黄铁矿的回收率随着氧化时间的延长而降低。X射线光电子能谱分析(XPS)结果显示,氧化后的黄铁矿表面新出现了硫单质、硫酸铁和氢氧化铁等物质的相关特征峰,且黄铁矿氧化过程以氢氧化铁覆盖其表面为终止。浮选过程中,氧化后黄铁矿表面的氢氧化铁等亲水性物质改变了黄铁矿的表面性质,阻碍了捕收剂的吸附,降低了黄铁矿的可浮性。研究结果可以为硫化矿浮选中降低黄铁矿可浮性以实现其与贵金属等的浮选分离提供参考。
In order to clarify the oxidation law of pyrite under natural conditions and the effect of surface oxidation of py?rite on flotation. The effect of oxidation time on the floatability of pyrite single mineral under natural oxidation conditions was studied. The recovery of pyrite decreased with the increase of oxidation time. The results of X-ray photoelectron spectroscopy(XPS) show that there are new characteristic peaks of sulfur,ferric sulfate and ferric hydroxide on the surface of oxidized py?rite,and the oxidation of pyrite terminated when ferric hydroxide covered its surface. During the flotation process,hydrophilic substances such as iron hydroxide formed on the surface of oxidized pyrite and changed the surface properties of pyrite,hin?dered the adsorption of collectors and reduced the floatability of pyrite. The results provide some references for the flotation separation of precious metal from pyrite by decrease the floatability of pyrite.
In order to clarify the oxidation law of pyrite under natural conditions and the effect of surface oxidation of py?rite on flotation. The effect of oxidation time on the floatability of pyrite single mineral under natural oxidation conditions was studied. The recovery of pyrite decreased with the increase of oxidation time. The results of X-ray photoelectron spectroscopy(XPS) show that there are new characteristic peaks of sulfur,ferric sulfate and ferric hydroxide on the surface of oxidized py?rite,and the oxidation of pyrite terminated when ferric hydroxide covered its surface. During the flotation process,hydrophilic substances such as iron hydroxide formed on the surface of oxidized pyrite and changed the surface properties of pyrite,hin?dered the adsorption of collectors and reduced the floatability of pyrite. The results provide some references for the flotation separation of precious metal from pyrite by decrease the floatability of pyrite.
引文
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[3]涂志红.黄铁矿氧化过程中硫形态转化及其表面氧化电化学研究[D].广州:华南理工大学,2017.Tu Zhihong.Studies of Sulfur Transformation in Oxidation of Pyrite and Surface Electrochemistry of Pyrite Oxidation[D].Guangzhou:South China University of Technology,2017.
[4]邱廷省,罗仙平,方夕辉.黄铁矿氧化抑制行为及机理研究[J].矿产综合利用,2001(5):17-20.Qiu Tingsheng,Luo Xianping,Fang Xihui.Study on depression behavior and oxidation mechanism of pyrite[J].Multipurpose Utilization of Mineral Resources,2001(5):17-20.
[5]周源,余新阳.无机氧化剂对黄铁矿和黄铜矿可浮性的影响[J].金属矿山,2005(2):36-38.Zhou Yuan,Yu Xinyang.Effectof inorganic oxidizer on floatabilityof pyrite and chalcopyrite[J].Metal Mine,2005(2):36-38.
[6]Yu X R,Liu F,Wang Z Y,et al.Auger parameters for sulfur-containing compounds using a mixed aluminum-silver excitation source[J].Journal of Electron Spectroscopy&Related Phenomena,1990,50(2):159-166.
[7]Volmer Uebing M,Stratmann M.A surface analytical and an electrochemical study of iron surfaces modified by thiols[J].Applied Surface Science,1992,55(1):19-35.
[8]Allen G C,Curtis M T,Hooper A J,et al.X-ray photoelectron spectroscopy of iron oxygen systems[J].Journal of the Chemical Society Dalton Transactions,1974(14):1525-1530.
[9]Brion D.Etude par spectroscopie de photoelectrons de la degradation superficielle de FeS2,CuFeS2,ZnS et PbS a l'air et dans l'eau[J].Applications of Surface Science,1980,5(2):133-152.
[10]Holmes P R,Crundwell F K.The kinetics of the oxidation of pyrite by ferric ions and dissolved oxygen:an electrochemical study[J].Geochimica Et Cosmochimica Acta,2000,64(2):263.
[11]Schippers A,Jozsa P G,Sand W.Sulfur chemistry in bacterial leaching of pyrite[J].Applied and Environmental Microbiology,1996,62(9):3424-3431.
[12]Sun Heyun,Chen Miao,Zou Laichang,et al.Study of the kinetics of pyrite oxidation under controlled redox potentia[lJ].Hydrometallurgy,2015,155:13-19.