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Yunjiao LI,Xiaoping Huang,Kaihua Huang,Shuai Wang,Zhanfang Cao,Hong Zhong 한국공업화학회 2019 Journal of Industrial and Engineering Chemistry Vol.77 No.-
In this paper, a novel b-Oxo thioamide surfactant 3-(ethylamino)-N-phenyl-3-thioxopropanamide(EAPhTXPA) was synthesized andfirst used asflotation collector for galena and sphalerite. The results ofmicro-flotation tests showed that EAPhTXPA possessed not only stronger collecting ability but also betterselectivity to galena against sphalerite than traditional sulfide collector sodium isobutyl xanthate (SIBX). Adsorption tests indicated that EAPhTXPA could adsorb onto galena surfaces more easily than SIBX, whilethe adsorption affinity of EAPhTXPA to sphalerite was weaker than that of SIBX. The results of FTIR andXPS spectra demonstrated that there was no chemical bond or new chemical state appeared on sphaleritesurfaces after treatment by EAPhTXPA, while Pb-EAPhTXPA complexes were formed on galena surfacesby reaction of EAPhTXPA’sC(¼S) ,C(¼O)andNHgroups with surface Pb atoms to buildPb S, Pb O and Pb N bonds. DFT calculations further gave an evidence that the dominated interactionbetween sphalerite and EAPhTXPA was probably van der Walls forces, and EAPhTXPA reacted with galenaby the formation of Pb S, Pb O and Pb N bonds.
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