阳离子捕收剂对高岭石的捕收性能及动力学模拟
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摘要
通过单矿物浮选试验、Zeta动电位测定、红外光谱测试和MS 6.0分子动力学模拟,分析了十二胺盐酸盐(DAH)和十二胺聚氧乙烯醚(AC1201)对煤系高岭石的浮选行为和作用机理。结果表明,药剂浓度为750g/t时,AC1201可较好地浮选高岭石。借助MS软件模拟,构建DAH和AC1201单分子在高岭石(001)面的最优吸附构型,计算结果表明:AC1201分子距高岭石(001)面的最小距离小于DAH分子距高岭石表面的最小距离,而且AC1201分子与矿物表面的接触面积大于DAH,吸附能更低。理论计算和浮选实验结果相互一致,可为探索高岭石浮选药剂提供理论基础。
Pure kaolinite flotation test,Zeta potential measurements,IR spectra and the MS 6.0molecular dynamics simulation are conducted to study the flotation behavior and interaction mechanism of dodecyl-amine ethoxylate(AC1201)and dodecy-lamine hydrochloride(DAH)on coal kaolinite.The results show that AC1201 can separate kaolinite effectively at lower concentration of 750 compared with DAH.Based on the MS simulation,the adsorption models of DAH and AC1201 on kaolinite(001)plane were constructed and optimized.It shows that the contact area of AC1201 on kaolinite(001)plane is larger than DAH,the minimum distance between AC1201 and the kaolinite(001)plane is less than DAH.In addition,higher adsorption energy will be released when AC1201 is adsorbed on kaolinite surface.The theoretical computations match remarkably well with the experimental results.Therefore,it can provide a theoretical basis for exploring new reagent in kaolinite flotation.
Pure kaolinite flotation test,Zeta potential measurements,IR spectra and the MS 6.0molecular dynamics simulation are conducted to study the flotation behavior and interaction mechanism of dodecyl-amine ethoxylate(AC1201)and dodecy-lamine hydrochloride(DAH)on coal kaolinite.The results show that AC1201 can separate kaolinite effectively at lower concentration of 750 compared with DAH.Based on the MS simulation,the adsorption models of DAH and AC1201 on kaolinite(001)plane were constructed and optimized.It shows that the contact area of AC1201 on kaolinite(001)plane is larger than DAH,the minimum distance between AC1201 and the kaolinite(001)plane is less than DAH.In addition,higher adsorption energy will be released when AC1201 is adsorbed on kaolinite surface.The theoretical computations match remarkably well with the experimental results.Therefore,it can provide a theoretical basis for exploring new reagent in kaolinite flotation.
引文
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[2]杜振宝,路迈西,丁靖洋.煤系高岭土资源开发利用现状[J].煤炭加工与综合利用,2010(2):47-49.
[3]李晓辉.山西省应大力发展煤矸石煅烧高岭土精品[J].科技情报开发与经济,2014,14(11):101-102.
[4]Zhao S M,Wang D Z,Hu Y H,et al.A series of aminoamides used for flotation of kaolinite[J].Journal of University and Technology Beijing,2005,12(03):208-212.
[5]Cao X F,Liu C M,Hu Y H.Flotation of kaolinite with dodecyl tertiary amines[J].Journal of Central South University of Technology,2009(5):749-752.
[6]张国范,冯其明,卢毅屏,等.油酸钠对一水硬铝石和高岭石的捕收机理[J].中国有色金属学报,2001,11(2):298-301.
[7]Wang Y H,Hu Y H,Chen X Q.Aluminum-silicates flotation with quaternary ammonium salts[J].Transactions of Nonferrous Metals Society of China,2003(3):715-719.
[8]李海普,胡岳华,王淀佐,等.阳离子表面活性剂与高岭石的相互作用机理[J].中南大学学报:自然科学版,2004(2):228-233.
[9]Liu C.M.,Feng A.S.,Guo Z.X.,et al.Dynamics simulation of tertiary amines adsorbing on kaolinite(001)plane[J].Transactions of Nonferrous Metals Society of China,2011(8):1874-1879.
[10]徐华龙,蒋昊,董发勤,等.DTAC对不同粒级高岭石浮选行为的影响[J].中国矿业大学学报,2013,42(5):832-837.
[11]陈攀,孙伟,岳彤.季鏻盐在高岭石(001)面上的吸附动力学模拟[J].中国矿业大学学报,2014,43(2):294-299.
[12]岳彤,孙伟,陈攀.季铵盐类捕收剂对铝土矿反浮选的作用机理[J].中国有色金属学报,2014,24(11):2873-2878.
[13]郭静楠,王方平.羧基羟肟酸浮选一水硬铝石高岭石的理论研究[J].广州华工,2012,40(11):6-8.
[14]罗思岗,王福良.分子力学在研究浮选药剂与矿物表面作用中的应用[J].矿冶,2009,18(1):1-4.
[15]Reimer U.,Wahab M.,Schiller P.,M9gel H.-J.Monte Carlo study of surfactant adsorption on heterogeneous solid surfaces[J].Langmuir,2005,21(4):1640-1646.
[16]Tarek M.,Bandyopadhyay S.,Klein M.L.Molecular dynamics studies of aqueous surfactants systems[J].Journal of Molecular Liquids,1998,78:1-6.
[17]Leermakers F.A.M.,Koopal L.K.,Goloub T.P.,et al.Confinement induced symmetry breaking of interfacial surfactant layers[J].The Journal of Physical Chemistry Part B:Condensed Matter,Materials,Surfaces,Interfaces&Biophysical,2006,110(17):8756-8763.
[18]宋其圣,郭新利.十二烷基苯磺酸钠在SiO2表面聚集的分子动力学模拟[J].物理化学学报,2009,25(6):1053-1058.
[19]Huang Z.Q.,Zhong H.,Wang S.,et al.Gemini trisiloxane surfactant:Synthesis and flotation of aluminosilicate minerals[J].Minerals Engineering,2014(56):145-154.
[20]魏克武,牟杏妹.高岭石和石英的分离[J].非金属矿,1992(2):53-57.
[21]刘安.非极性油辅助十二胺混溶捕收剂提效机理研究[D].太原:太原理工大学,2015:67-68
[22]刘安,樊民强.十二胺聚氧乙烯醚对石英的捕收性能[J].金属矿山,2014(10):51-55.
[23]余新阳,钟宏,刘广义.阳离子反浮选脱硅捕收剂研究现状[J].轻金属,2008(6):6-10.
[24]Fox J R,Andersen H C.Molecular dynamics simulations of a supercolled monatomic liquid and glass[J].J.Phys.Chem,1984,88(18):4019-4027.
[25]Brown D,Clarke J H R.Molecular dynamics simulation of an amorphous polymer under tension.1.Phenomenology[J].Macromolecules,1991,24(8):2075-2082.
[26]Pradip,Rai B.Design of tailor-made surfactants for industrial applications using a molecular modeling approach[J].Colloids Surfaces A:Physicochemical and Engineering Aspects,2002,205:139-148.