《Table 1.XRF chemical analysis of the fresh hemimorphite sample》

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《Improved hemimorphite flotation using xanthate as a collector with S(Ⅱ) and Pb(Ⅱ) activation》

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wt%

A high-purity natural hemimorphite（Zn4 （H2O）[Si2O7]（OH）2） sample（Yunnan province，China）was used in this study.The chemical composition of the sample was studied by X-ray fluorescence（XRF，Philips X Unique2）；the results are shown in Table 1.The sharp and narrow peaks observed in the X-ray diffraction（XRD，Bruker D8 Advance powder diffractometer with Co Kαradiation source）pattern indicate that the hemimorphite sample was pure（Fig.1）.Some cubic pieces from the large specimens of hemimorphite were used for contact-angle measurements.The other samples were dry ground with a ceramic mortar and pestle and then screened with stainless steel sieves.The+38 to-106μm size range was used in the microflotation tests，and the<38μm size fraction was further ground in an agate mortar to obtain a particle size of<5μm；this sample was subsequently used in the zeta-potential，SEM–EDS，and DRIFTS measurements.