FTIR studies of xanthate adsorption on chalcopyrite, pentlandite and pyrite surfaces

Abstract:The flotation and adsorption of a new polysaccharide konjac gum (KG) on pyrite and talc in the presence of pre-adsorbed potassium butyl xanthate (PBX) is investigated. The micro-flotation results show that KG is a quality depressant for talc and that conditioning the minerals initially with PBX before KG will increase the recovery difference between pyrite and talc. The results of artificially mixing the minerals show that compared with adding KG before PBX, when minerals are pre-adsorbed with PBX, the grade and the recovery of sulfur (S) increases by 1.96% and 5.44%, respectively. The contact angle results show that the addition of PBX before KG will increase the contact angles of pyrite, but the addition order of KG/PBX has little influence on the contact angles of talc. The adsorption tests show that KG can adsorb on pyrite and talc surfaces, while PBX can only adsorb on the pyrite surface. The addition order of KG/PBX affects the adsorption of KG and PBX on the pyrite surface but not on the talc surface. Fourier transform infrared (FTIR) spectra analysis further demonstrates the chemical adsorption of KG on pyrite and talc surfaces, while PBX chemisorbs on the pyrite surface. Based on these analyses, a schematic illustration of the reagent adsorption forms on pyrite and talc surfaces is drawn to explain the competitive adsorption of KG and PBX on mineral surfaces.

Section: Ftir Spectra Analysissupporting

confidence: 80%

“…In the IR spectrum of PBX, the peak at 1064 cm −1 is attributed to the C=S stretching vibration. The intense peak at 1114 cm −1 belongs to the C-O-C symmetric stretching vibration [23].…”

Section: Ftir Spectra Analysismentioning

confidence: 99%

Flotation and Adsorption of a New Polysaccharide Depressant on Pyrite and Talc in the Presence of a Pre-Adsorbed Xanthate Collector

Deng

Tian

et al. 2017

“…The spectra are given for the region 600-1600 cm −1 where all the absorption bands are characteristic of the NaBX and (BX)2 polar groups. The characteristic IR spectral peaks of these collectors are very similar to that gained by other researcher [20]. In Figure 9, the characteristic peaks at 1168.92 and 1191.95 cm −1 arise from asymmetric stretching vibration of C-O-C in NaBX.…”

Section: Ftir Analysissupporting

confidence: 74%

The Desulfurization of Magnetite Ore by Flotation with a Mixture of Xanthate and Dixanthogen

Cai

2016

Abstract:The contamination of sulfur emanating from pyrrhotite in magnetite concentrates has been a problem in iron ore processing. This study utilized froth flotation to float pyrrhotite away from magnetite using collectors of xanthate and dixanthogen. It was found that xanthate or dixanthogen alone could not achieve selective separation between pyrrhotite and magnetite in flotation. A high loss of magnetite was obtained with xanthate, while a low desulfurization degree was obtained with dixanthogen. It was interesting that a high desulfurization ratio was achieved with little loss of magnetite when xanthate was mixed with dixanthogen as the collector. The synergistic effect of the mixed collector on pyrrhotite was studied by electrokinectic studies and FTIR measurements. It was found that xanthate was the anchor on pyrrhotite and determined its selectivity against magnetite, while dixanthogen associated with xanthate, enhancing its hydrophobicity. This study provides new insights into the separation of iron minerals.

“…The spectral differences between KBX (Figure 1a) and the CCP-KBX reaction products (Figure 1b) are based on the new chemical structure of the compounds obtained after KBX conditioning on the CCP surface, an effect that is known for flotation reactions [50][51][52] as the composition of the reaction products varies strongly on the conditioning parameters. The reaction products have been investigated by several groups with FT-IR [7], XPS [53], and other X-ray techniques [54], leading to the conclusion that the reaction product is dominated by cuprous xanthate and dixanthogen.…”

Section: Atr Ft-ir Measurementsmentioning

confidence: 99%

Near-Field Optical Examination of Potassium n-Butyl Xanthate/Chalcopyrite Flotation Products

Firkala

Kuschewski²,

Nörenberg³

et al. 2018

Abstract:The present study introduces scattering-type scanning near-field infrared optical nanospectroscopy (s-SNIM) as a valuable and well-suited tool for spectrally fingerprinting n-butyl xanthate (KBX) molecules adsorbed to chalcopyrite (CCP) sample surfaces. The collector KBX is well known to float CCP and is used in beneficiation. We thus identified KBX reaction products both by IR optical far-and near-field techniques, applying attenuated total internal reflection Fourier-transform infrared spectroscopy (ATR FT-IR) in comparison to s-SNIM, respectively. The major KBX band around 880 cm −1 was probed in s-SNIM using both the tunable free-electron laser FELBE at the Helmholtz-Zentrum Dresden-Rossendorf facility, Germany, and table-top CO 2 laser illumination. We then were able to monitor the KBX agglomeration in patches <500 nm in diameter at the CCP surface, as well as nanospectroscopically identify the presence of KBX reaction products down to the 10 −4 M concentration.