Reactivity of xanthate and dixanthogen in aqueous solutions of different pH

Tipman, R.N; Leja, J.

doi:10.1007/bf01419251

Cited by 36 publications

(11 citation statements)

References 5 publications

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“…Extensive studies on the chemistry of aqueous solutions of alkyl xanthates have been carried out by numerous workers [15][16][17]. The reactions of xanthates have been found to be very complex because of the formation of various decomposition products.…”

Section: Resultsmentioning

confidence: 99%

Molecular modeling study on the relative stabilities of the flotation products for arsenic-containing minerals: dixanthogens and arsenic(III) xanthates

Yekeler

2005

Journal of Colloid and Interface Science

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Section: Resultsmentioning

confidence: 99%

Molecular modeling study on the relative stabilities of the flotation products for arsenic-containing minerals: dixanthogens and arsenic(III) xanthates

Yekeler

2005

Journal of Colloid and Interface Science

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“…The decrease of DTP concentration in the mineral solution can be traced with the depletion of one UV absorbance band at 227 nm [10]. The one band of UV absorbance is because of the dimer of dithiophosphates is insoluble with solubility at about 5×10 -7 M in comparison to that of diethyl dixanthogen at about 1.25×10 -5 M [11]. Thus, the dimer is less likely to appear in the UV spectra of the solution, simplifying the adsorption measurement.…”

Section: Observation Using Uv-vis Spectrophotometrymentioning

confidence: 99%

Study of diethyl dithiophosphate adsorption on chalcopyrite and tennantite at varied pHs

et al. 2011

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The kinetics of diethyl dithiophosphate adsorption on chalcopyrite and tennantite has been studied by UV-visible spectroscopy at pH values of 4, 6, and 9. The concentration of diethyl dithiophosphate in the solution has been monitored as a function of time and pH for both minerals. It was found that the adsorption tendency of diethyl dithiophosphate on both minerals decreased with the increasing pH treatments. This is due to the existence of metal hydroxide species onto the mineral surface in more alkaline condition inhibiting the adsorption of diethyl dithiophosphate species. In comparison to that of chalcopyrite, tennantite possessed slightly higher adsorption of diethyl dithiophosphate in acid condition, while vice versa correlation observed at other pH treatments at where the coverage of metal hydroxide species obtained higher than that of chalcopyrite showing that the rate oxidation of tennantite is higher. An adsorption mechanism has been proposed and tested against the experimental kinetic data. Both the kinetic data and flotation studies are consistent with the proposed mechanism.

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“…Iwasaki et al (Iwasaki and Cooke, 1958), Finkelstein (Finkelstein, 1967), and Tipman et al (Tipman and Leja, 1975) indicated that oxygen did not affect decomposition in acidic and alkaline solutions. It This permits studying xanthate decomposition under ambient conditions; i.e.…”

Section: Introductionmentioning

confidence: 99%

“…Ballard et al (Ballard et al, 1954), Klein et al (Klein et al, 1960) and Iwasaki et al (Iwasaki and Cooke, 1964) proposed such a maximum when pH reached a certain low level while others did not Cooke, 1958, 1959). Under alkaline conditions, Tipman et al (Tipman and Leja, 1975) found that decomposition remained almost unchanged with pH, while Finkelstein (Finkelstein, 1967(Finkelstein, , 1977 observed that it still decreased.…”

Section: Introductionmentioning

confidence: 99%

Study of xanthate decomposition in aqueous solutions

Shen

Nagaraj²,

Farinato³

et al. 2016

Minerals Engineering

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Xanthate is one of the commonly used collectors in froth flotation beneficiation of sulfide ores. It could decomposes and generates toxic compounds such as carbon disulfide (CS 2) which is a concern in the mining industry. A vast body of literature exists for studies on xanthate/mineral interactions, but xanthate decomposition under various conditions (e.g., in solutions or flotation pulps) is not fully understood. We have undertaken detailed studies to fill this knowledge gap, and this paper shows our study of the xanthate decomposition in aqueous solutions in the absence of minerals. This condition has not been appropriately examined by past researchers, while decomposition under this condition is used as control to other complicated ones (e.g., in flotation pulps). A GC-MS based method was developed to directly measure the decomposition products in the gas phase. Decomposition kinetics was then established based on the generation of CS 2. Decomposition followed the first order kinetics, and the rate constant for Sodium iso-Butyl Xanthate (SIBX) at neutral pH level was determined to be 9.3x10-4 h-1 at 25 °C, 1.7x10-2 h-1 at 50 °C and 1.3x10-1 h-1 at 70 °C. The effect of pH on decomposition behavior was examined in the pH range of 1.5 to 12.5. We determined experimentally a maximum in the extent of decomposition extent as a function of pH, which was predicted theoretically in literature. A mechanism involving multiple reactions that occurred in parallel or in sequence sequentially along with the decomposition was proposed to explain the observed change of xanthate decomposition in over the entire pH range. These results offer valuable insights and can serve as the basis to mitigate the detrimental effects of xanthate decomposition in plant

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Reactivity of xanthate and dixanthogen in aqueous solutions of different pH

Cited by 36 publications

References 5 publications

Molecular modeling study on the relative stabilities of the flotation products for arsenic-containing minerals: dixanthogens and arsenic(III) xanthates

Molecular modeling study on the relative stabilities of the flotation products for arsenic-containing minerals: dixanthogens and arsenic(III) xanthates

Study of diethyl dithiophosphate adsorption on chalcopyrite and tennantite at varied pHs

Study of xanthate decomposition in aqueous solutions

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