含金黄铁矿晶体结构、电子性质及浮选行为研究
发布时间：2019-05-09 21:34
【摘要】：本文以黄铁矿和含金黄铁矿为研究对象,通过对含金黄铁矿浮选行为的研究,考察了丁黄药、丁铵黑药、乙硫氮三种捕收剂,硫酸铜活化剂,pH值以及硫化钠、石灰两种抑制剂对矿物浮选性质的影响；应用电化学工作站,测试矿物表面与药剂作用的循环伏安曲线,探讨各种药剂在黄铁矿和含金黄铁矿表面的氧化作用；运用密度泛函理论平面波赝势第一性原理方法,研究了黄铁矿和含金黄铁矿的体相性质和表面性质,探索金在黄铁矿体相和表面的赋存方式。含金黄铁浮选试验研究结果表明：自然条件下,黄铁矿和含金黄铁矿在丁黄药和乙硫氮作为捕收剂时可浮性极为相似；丁胺黑药作为捕收剂时两者的可浮性相差较大。硫酸铜对含金黄体矿比对黄铁矿的活化作用强。pH不同时两种矿物的可浮性差异比很大。黄体矿和含金黄体矿在用石灰作为抑制剂时可浮性差异很大；而用Na2S作为抑制剂时可浮性差异不大。电化学研究结果表明：在碱性条件下,金促进了捕收剂在黄铁矿表面的氧化反应；中性条件下,含金没有改变黄药在黄铁矿表面的氧化作用,但却抑制了乙硫氮在黄铁矿表面的氧化反应。在硫化钠作为抑制剂时,金没有改变黄药与乙硫氮在黄铁矿表面的氧化反应,而黑药在含金黄铁矿表面的氧化作用比在黄铁矿表面的氧化作用强。在氢氧化钙作为抑制剂时金没有影响黄药和乙硫氮在黄铁矿表面的电化学反应,却抑制了黄铁矿与黑药的电化学反应。含金黄铁矿晶体结构和性质的计算结果表明：金更容易取代硫位和间位,原子电荷的计算表明金以Au1+存在于黄铁矿中,形成后的黄铁矿中发生了Au-S键共价键和Au-Fe键的反键作用,S 3p和Au 5d态发生了明显的杂化,黄铁矿为P型半导体而含金黄铁矿为n型半导体。含金对黄铁矿表面电子结构的影响的研究结果表明：金容易吸附在在黄铁矿表面铁-硫键上。
[Abstract]:In this paper, pyrite and gold-bearing pyrite were taken as the research objects. Through the study of the flotation behavior of gold-bearing pyrite, three kinds of collector, butylxanthate, ammonium butylammonium black agent, ethyl sulfur nitrogen collector, copper sulfate activating agent, pH value and sodium sulfide, were investigated. Effects of lime two inhibitors on mineral flotation properties; The cyclic volt-ampere curves of the interaction between mineral surface and reagent were measured by electrochemical workstation, and the oxidation of various reagents on pyrite and gold-bearing pyrite surface was discussed. By using the first principle method of plane wave pseudopotential of density functional theory, the bulk phase and surface properties of pyrite and gold-bearing pyrite are studied, and the occurrence mode of gold in Huang Tie orebody phase and surface is explored. The results of Huang Tie flotation test show that under natural conditions, the floatability of pyrite and gold-bearing pyrite is very similar when butylpyrite and ethylthio-nitrogen are used as collector, and there is a great difference between them when butylamine black agent is used as collector. Copper sulfate has a stronger activation effect on gold-bearing yellow ore than pyrite, and the floatability of the two minerals is very different from each other at different pH. There is a great difference in floatability between yolk ore and gold-bearing yellow ore when lime is used as inhibitor, but there is no difference in floatability when Na2S is used as inhibitor. The results of electrochemical study show that gold promotes the oxidation of collector on the surface of pyrite under alkaline conditions. Under neutral conditions, gold content did not change the oxidation of xanthate on pyrite surface, but inhibited the oxidation of ethylthio-nitrogen on pyrite surface. When sodium sulfide is used as an inhibitor, gold does not change the oxidation reaction of xanthate with ethylthio-nitrogen on the surface of pyrite, but the oxidation of black medicine on the surface of gold-bearing pyrite is stronger than that on the surface of pyrite. When calcium hydroxide was used as inhibitor, gold did not affect the electrochemical reaction of xanthate and ethanesulfon on the surface of pyrite, but inhibited the electrochemical reaction of pyrite and black medicine. The calculation results of crystal structure and properties of gold-bearing pyrite show that gold is easier to replace sulfur site and interposition, and the calculation of atomic charge shows that gold exists in pyrite with Au1. The counterbonding of Au-S bond covalent bond and Au-Fe bond occurs in the formed pyrite, and the S 3p and Au 5 d states are obviously hybrid. Pyrite is a P type semiconductor and gold bearing pyrite is an n type semiconductor. The effect of gold content on the electronic structure of pyrite surface shows that gold is easily adsorbed on the iron-sulfur bond on pyrite surface.
【学位授予单位】：广西大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TD923;TD951
本文编号：2473108
[Abstract]:In this paper, pyrite and gold-bearing pyrite were taken as the research objects. Through the study of the flotation behavior of gold-bearing pyrite, three kinds of collector, butylxanthate, ammonium butylammonium black agent, ethyl sulfur nitrogen collector, copper sulfate activating agent, pH value and sodium sulfide, were investigated. Effects of lime two inhibitors on mineral flotation properties; The cyclic volt-ampere curves of the interaction between mineral surface and reagent were measured by electrochemical workstation, and the oxidation of various reagents on pyrite and gold-bearing pyrite surface was discussed. By using the first principle method of plane wave pseudopotential of density functional theory, the bulk phase and surface properties of pyrite and gold-bearing pyrite are studied, and the occurrence mode of gold in Huang Tie orebody phase and surface is explored. The results of Huang Tie flotation test show that under natural conditions, the floatability of pyrite and gold-bearing pyrite is very similar when butylpyrite and ethylthio-nitrogen are used as collector, and there is a great difference between them when butylamine black agent is used as collector. Copper sulfate has a stronger activation effect on gold-bearing yellow ore than pyrite, and the floatability of the two minerals is very different from each other at different pH. There is a great difference in floatability between yolk ore and gold-bearing yellow ore when lime is used as inhibitor, but there is no difference in floatability when Na2S is used as inhibitor. The results of electrochemical study show that gold promotes the oxidation of collector on the surface of pyrite under alkaline conditions. Under neutral conditions, gold content did not change the oxidation of xanthate on pyrite surface, but inhibited the oxidation of ethylthio-nitrogen on pyrite surface. When sodium sulfide is used as an inhibitor, gold does not change the oxidation reaction of xanthate with ethylthio-nitrogen on the surface of pyrite, but the oxidation of black medicine on the surface of gold-bearing pyrite is stronger than that on the surface of pyrite. When calcium hydroxide was used as inhibitor, gold did not affect the electrochemical reaction of xanthate and ethanesulfon on the surface of pyrite, but inhibited the electrochemical reaction of pyrite and black medicine. The calculation results of crystal structure and properties of gold-bearing pyrite show that gold is easier to replace sulfur site and interposition, and the calculation of atomic charge shows that gold exists in pyrite with Au1. The counterbonding of Au-S bond covalent bond and Au-Fe bond occurs in the formed pyrite, and the S 3p and Au 5 d states are obviously hybrid. Pyrite is a P type semiconductor and gold bearing pyrite is an n type semiconductor. The effect of gold content on the electronic structure of pyrite surface shows that gold is easily adsorbed on the iron-sulfur bond on pyrite surface.
【学位授予单位】：广西大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TD923;TD951
【参考文献】
相关期刊论文 前2条
1 Э·П·特罗普曼,黎辛;新型醇类起泡剂ОФС[J];国外金属矿选矿;2001年08期
2 陈建华;陈晔;李玉琼;;Quantum-mechanical study of effect of lattice defects on surface properties and copper activation of sphalerite surface[J];Transactions of Nonferrous Metals Society of China;2010年06期
，本文编号：2473108
本文链接：https://www.wllwen.com/kejilunwen/kuangye/2473108.html
