The adsorption of sodium oleate(NaOL)at the microfine hematite/aqueous solution interface was investigated in this paper.Experimental research indicated that negative effects stemmed from the dissolution of the microf...The adsorption of sodium oleate(NaOL)at the microfine hematite/aqueous solution interface was investigated in this paper.Experimental research indicated that negative effects stemmed from the dissolution of the microfine hematite(D50=19.21μm)could be effectively eliminated via the appropriate dosage of NaOL at alkali pH conditions.Solution chemistry calculation and adsorption test results indicated that RCOOand(RCOO)_(2)^(2-) ions were responsible for microfine hematite flotation at pH 8.2.Zeta potential and FTIR measurements confirmed the co-adsorption of molecular and ionic oleate species occurred at pH 8.2.X-ray photoelectron spectroscopy(XPS)results further indicated that oleate species interacted with hematite surfaces mainly through chemisorption,giving rise to molecule/colloid formation of oleate and Fe―OL complex compound.Time-of-flight secondary ion mass spectrometry(ToF-SIMS)results demonstrated that oleate species adsorbed onto the hematite surfaces with a thickness of a few nanometers.Furthermore,the normalized peak intensity of C4H7+ions on the hematite sample at pH 8.2 increased remarkably comparing with corresponding result of hematite sample at pH 6.8.The new findings of the present study well revealed the dissolution of microfine hematite and the pH effects on the hematite flotation,as well as the adsorption characteristics of oleate species.展开更多
ORGANIC minerogenesis is one of the important studies in the field of low-temperature mineralization. Ithas been well documented that organic matter plays a very important role in the transport, precipitationand enric...ORGANIC minerogenesis is one of the important studies in the field of low-temperature mineralization. Ithas been well documented that organic matter plays a very important role in the transport, precipitationand enrichment of gold in the process of mineralization of gold deposits. We have found that manyresearches mainly employed the organic geochemical and experimentally geochemical methods to explorethe role of organic matter in minerogenesis. As kerogen is dispersed in ores and possesses microscopic geological characteristics as observed in its inner parts, little information has been developed about the geological phenomena of minerogenesis developed in the inner part of kerogen. We have adopted a variety ofsophisticated microbeam analysis techniques in the study of microscopic metasomatism and characteristicsof gold occurrence developed in the inner parts of kerogen from the ores of the Yata microfine disseminat-展开更多
基金supported by the Natural Science Foundation of China (No. 52164021)the Natural Science Foundation of Yunnan Province (No. 2019FB078)
文摘The adsorption of sodium oleate(NaOL)at the microfine hematite/aqueous solution interface was investigated in this paper.Experimental research indicated that negative effects stemmed from the dissolution of the microfine hematite(D50=19.21μm)could be effectively eliminated via the appropriate dosage of NaOL at alkali pH conditions.Solution chemistry calculation and adsorption test results indicated that RCOOand(RCOO)_(2)^(2-) ions were responsible for microfine hematite flotation at pH 8.2.Zeta potential and FTIR measurements confirmed the co-adsorption of molecular and ionic oleate species occurred at pH 8.2.X-ray photoelectron spectroscopy(XPS)results further indicated that oleate species interacted with hematite surfaces mainly through chemisorption,giving rise to molecule/colloid formation of oleate and Fe―OL complex compound.Time-of-flight secondary ion mass spectrometry(ToF-SIMS)results demonstrated that oleate species adsorbed onto the hematite surfaces with a thickness of a few nanometers.Furthermore,the normalized peak intensity of C4H7+ions on the hematite sample at pH 8.2 increased remarkably comparing with corresponding result of hematite sample at pH 6.8.The new findings of the present study well revealed the dissolution of microfine hematite and the pH effects on the hematite flotation,as well as the adsorption characteristics of oleate species.
文摘ORGANIC minerogenesis is one of the important studies in the field of low-temperature mineralization. Ithas been well documented that organic matter plays a very important role in the transport, precipitationand enrichment of gold in the process of mineralization of gold deposits. We have found that manyresearches mainly employed the organic geochemical and experimentally geochemical methods to explorethe role of organic matter in minerogenesis. As kerogen is dispersed in ores and possesses microscopic geological characteristics as observed in its inner parts, little information has been developed about the geological phenomena of minerogenesis developed in the inner part of kerogen. We have adopted a variety ofsophisticated microbeam analysis techniques in the study of microscopic metasomatism and characteristicsof gold occurrence developed in the inner parts of kerogen from the ores of the Yata microfine disseminat-
