Correlation of Surface Adsorption and Oxidation with a Floatability Difference of Galena and Pyrite in High-Alkaline Lime Systems

doi:10.1021/acs.langmuir.7b04189

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	Correlation of Surface Adsorption and Oxidation with a Floatability Difference of Galena and Pyrite in High-Alkaline Lime Systems
	Niu, Xiaopeng 1,3; Ruan, Renman 1; Xia, Liuyin 2; Li, Li 1; Sun, Heyun 1; Jia, Yan 1; Tan, Qaoyi 1
刊名	LANGMUIR
	2018-02-27
卷号	34 期号:8 页码:2716-2724
ISSN号	0743-7463
DOI	10.1021/acs.langmuir.7b04189
文献子类	Article
英文摘要	When it comes to Pb-Zn ores with high amounts of pyrite, the major problem encountered is the low separation efficiency between galena and pyrite. By virtue of high dosage of lime and collector sodium diethyl dithiocarbamate (DDTC), pyrite and zinc minerals are depressed, allowing the galena to be floated. However, there have been significant conflicting reports on the flotation behavior of galena at high pH. In this context, correlation of the surface adsorption and oxidation with the floatability difference of galena and pyrite in high-alkaline lime systems would be a key issue for process optimization. Captive bubble contact angle measurements were performed on freshly polished mineral surfaces in situ exposed to lime solutions of varying pH as a function of immersion time. Furthermore, single mineral microflotation tests were conducted. Both tests indicated that the degree of hydrophobicity on the surfaces of galena and pyrite increased in the presence of DDTC at natural or mild pulp pH. While in a saturated lime solution, at pH 12.5, DDTC only worked for galena, but not for pyrite. Surface chemistry analysis by time-of flight secondary ion mass spectrometry (Tof-SIMS) confirmed the preference of DDTC on the galena surface at pH 12.5, which contributed to a merit recovery. Further important evidence through measurements of Tof-SIMS, ion chromatography, and highperformance liquid chromatography indicated that in high-alkaline lime systems, the merit floatability of galena could exclude the insignificant contribution of elemental sulfur (S-8) and was dominantly attributed by the strong adsorption of DDTC. In contrast, the poor flotation response of pyrite at high pH was due to the prevailing adsorption of CaOH+ species. This study provides an important surface chemistry evidence for a better understanding of the mechanism on the better selectivity in the galena-pyrite separation adopting high-alkaline lime systems.
WOS关键词	RAY PHOTOELECTRON-SPECTROSCOPY ; ETHYL XANTHATE ADSORPTION ; ION MASS-SPECTROMETRY ; FLOTATION SEPARATION ; SULFIDE MINERALS ; GRINDING ENVIRONMENT ; THIOL COLLECTORS ; DISSOLVED-OXYGEN ; BUTYL XANTHATE ; AIR BUBBLE
WOS研究方向	Chemistry ; Materials Science
语种	英语
WOS记录号	WOS:000426614100016
资助机构	National Natural Science Foundation of China(51674231 ; Bureau of International Cooperation, Chinese Academy of Sciences(122111KYSB20150013) ; Science and Technology Service Network Initiative, Chinese Academy of Sciences(KFJ-SW-STS-148) ; 41401541)
内容类型	期刊论文
源URL	[http://ir.ipe.ac.cn/handle/122111/24126]
专题	过程工程研究所_湿法冶金清洁生产技术国家工程实验室
作者单位	1.Chinese Acad Sci, Inst Proc Engn, CAS Key Lab Green Proc & Engn, Beijing 100190, Peoples R China 2.Univ Western Ontario, Surface Sci Western, Res Pk, London, ON N6G 0J3, Canada 3.Univ Chinese Acad Sci, Beijing 100049, Peoples R China
推荐引用方式 GB/T 7714	Niu, Xiaopeng,Ruan, Renman,Xia, Liuyin,et al. Correlation of Surface Adsorption and Oxidation with a Floatability Difference of Galena and Pyrite in High-Alkaline Lime Systems[J]. LANGMUIR,2018,34(8):2716-2724.
APA	Niu, Xiaopeng.,Ruan, Renman.,Xia, Liuyin.,Li, Li.,Sun, Heyun.,...&Tan, Qaoyi.(2018).Correlation of Surface Adsorption and Oxidation with a Floatability Difference of Galena and Pyrite in High-Alkaline Lime Systems.LANGMUIR,34(8),2716-2724.
MLA	Niu, Xiaopeng,et al."Correlation of Surface Adsorption and Oxidation with a Floatability Difference of Galena and Pyrite in High-Alkaline Lime Systems".LANGMUIR 34.8(2018):2716-2724.