含金黃鐵礦晶體結(jié)構(gòu)、電子性質(zhì)及浮選行為研究
發(fā)布時(shí)間：2019-05-09 21:34
【摘要】：本文以黃鐵礦和含金黃鐵礦為研究對象,通過對含金黃鐵礦浮選行為的研究,考察了丁黃藥、丁銨黑藥、乙硫氮三種捕收劑,硫酸銅活化劑,pH值以及硫化鈉、石灰兩種抑制劑對礦物浮選性質(zhì)的影響；應(yīng)用電化學(xué)工作站,測試礦物表面與藥劑作用的循環(huán)伏安曲線,探討各種藥劑在黃鐵礦和含金黃鐵礦表面的氧化作用；運(yùn)用密度泛函理論平面波贗勢第一性原理方法,研究了黃鐵礦和含金黃鐵礦的體相性質(zhì)和表面性質(zhì),探索金在黃鐵礦體相和表面的賦存方式。含金黃鐵浮選試驗(yàn)研究結(jié)果表明：自然條件下,黃鐵礦和含金黃鐵礦在丁黃藥和乙硫氮作為捕收劑時(shí)可浮性極為相似；丁胺黑藥作為捕收劑時(shí)兩者的可浮性相差較大。硫酸銅對含金黃體礦比對黃鐵礦的活化作用強(qiáng)。pH不同時(shí)兩種礦物的可浮性差異比很大。黃體礦和含金黃體礦在用石灰作為抑制劑時(shí)可浮性差異很大；而用Na2S作為抑制劑時(shí)可浮性差異不大。電化學(xué)研究結(jié)果表明：在堿性條件下,金促進(jìn)了捕收劑在黃鐵礦表面的氧化反應(yīng)；中性條件下,含金沒有改變黃藥在黃鐵礦表面的氧化作用,但卻抑制了乙硫氮在黃鐵礦表面的氧化反應(yīng)。在硫化鈉作為抑制劑時(shí),金沒有改變黃藥與乙硫氮在黃鐵礦表面的氧化反應(yīng),而黑藥在含金黃鐵礦表面的氧化作用比在黃鐵礦表面的氧化作用強(qiáng)。在氫氧化鈣作為抑制劑時(shí)金沒有影響黃藥和乙硫氮在黃鐵礦表面的電化學(xué)反應(yīng),卻抑制了黃鐵礦與黑藥的電化學(xué)反應(yīng)。含金黃鐵礦晶體結(jié)構(gòu)和性質(zhì)的計(jì)算結(jié)果表明：金更容易取代硫位和間位,原子電荷的計(jì)算表明金以Au1+存在于黃鐵礦中,形成后的黃鐵礦中發(fā)生了Au-S鍵共價(jià)鍵和Au-Fe鍵的反鍵作用,S 3p和Au 5d態(tài)發(fā)生了明顯的雜化,黃鐵礦為P型半導(dǎo)體而含金黃鐵礦為n型半導(dǎo)體。含金對黃鐵礦表面電子結(jié)構(gòu)的影響的研究結(jié)果表明：金容易吸附在在黃鐵礦表面鐵-硫鍵上。
[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.
【學(xué)位授予單位】：廣西大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2015
【分類號】：TD923;TD951
本文編號：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.
【學(xué)位授予單位】：廣西大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2015
【分類號】：TD923;TD951
【參考文獻(xiàn)】
相關(guān)期刊論文 前2條
1 Э·П·特羅普曼,黎辛;新型醇類起泡劑ОФС[J];國外金屬礦選礦;2001年08期
2 陳建華;陳曄;李玉瓊;;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
，本文編號：2473108
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