Removal of ethyl, isobutyl, and isoamyl xanthates using cationic gemini surfactant-modified montmorillonites

Huang, Qidong; Li, Xin; Ren, Sili; Luo, Wuhui

doi:10.1016/j.colsurfa.2019.123723

Cited by 34 publications

(7 citation statements)

References 45 publications

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“…This confirmed that P-O was the main functional groups in the SP molecule. For IAX, the peaks at 2922 and 2864 cm−1 corresponded to -CH2 and -CH3 stretching vibrations Huang et al, 2019).…”

Section: Ftir Measurementsmentioning

confidence: 99%

Dispersion of sodium phytate on muscovite and the implications for arsenopyrite flotation

Zhang¹,

Wang²,

Zhao³

et al. 2022

Physicochem. Probl. Miner. Process.

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The effective flotation separation of sulfides and sliming silicate minerals is always a difficult problem. In this paper, the selective flotation of arsenopyrite from muscovite was studied by using sodium phytate (SP) as dispersant, and the mechanism was investigated through SEM/EDS, zeta potential, FTIR and XPS measurements. Single mineral flotation results showed that with the increasing isoamyl xanthate (IAX) dosage the recovery of arsenopyrite increased, until 8×10-5 mol/L IAX (79.40% recovery, pH=7), after that it decreased slightly. While muscovite floated poorly at any IAX concentration. For the mixed minerals, arsenopyrite recovery was only 54.63% while that of muscovite was 42.70%, which was attributed to the coverage of muscovite on arsenopyrite surface. When 6×10 -5 mol/L SP was added into the mixed minerals system, the recovery of arsenopyrite recovered to 68.26% while that of muscovite was 8.48% (approximate the value of the single mineral). SEM/EDS results showed that SP could disperse muscovite and prevented its coverage on arsenopyrite surface. Zeta potential results showed that the electrokinetic potential of muscovite and arsenopyrite decrease from -26.60mV to -39.01 mV and from -26.90 mV to -27.84 mV at pH=7, respectively. It was obvious that the negatively charged phytate ions selectively adsorbed on the surface of muscovite. FTIR and XPS resulted co-proved the chemisorption of SP with active sites on muscovite while arsenopyrite spectrum did not change significantly, which was consistent with flotation and zeta potential results. The selective adsorption of SP on muscovite compared to arsenopyrite was responsible for the effective separation of them.

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Section: Ftir Measurementsmentioning

confidence: 99%

Dispersion of sodium phytate on muscovite and the implications for arsenopyrite flotation

Zhang¹,

Wang²,

Zhao³

et al. 2022

Physicochem. Probl. Miner. Process.

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“…In destructive methods, xanthates are cleaved to smaller molecules by acid decomposition or either conventional or advanced chemical oxidation. Advanced chemical oxidation includes ozone oxidation, as well as Fenton and photocatalytical methods. − Materials that collect the xanthate from wastewaters are usually based on zeolite-type materials. ,− These materials produce a great amount of waste, as they can be used only once. For sulfate anions, there are already some re-useable materials under development, based on resins and modified silica gels. , Even biological methods ,− are available for xanthates, utilizing divergent bacteria and algae, but these methods cannot be applied during cold winters of the arctic regions.…”

Section: Introductionmentioning

confidence: 99%

Uptake of Ethyl Xanthate to Metal Organic Frameworks

Kuosmanen,

Sievänen,

Lahtinen

2023

ACS Omega

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As the mining industry spreads to new areas in the arctic regions, the need for re-useable efficient methods for mine chemicals' recycling increases. Especially in the case of xanthates, which are used as collectors for many metals from ore. Xanthates are very toxic to aquatic life either directly or indirectly and cause potentially severe health problems to humans after long-term exposure. In the present work, potassium ethyl xanthate (KEX) was observed to coordinate into metal organic frameworks (MOFs). HKUST-1 and its post-synthetically modified forms were observed to behave most effectively of the studied MOFs at low concentrations of KEX. Differences in the uptake of KEX were detected regarding the synthesis method in the case of MIL-100(Fe) synthetized by solvothermal and mechanochemical methods. Other studied MOFs, UiO-66 and MIL-100(Al)/MIL-96(Al), were not observed to be effective in KEX uptake.

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“…In recent years, several methods have been developed to remove the residual xanthate from the aqueous solutions, such as chemical oxidation by ozone [13,14], hydrogen peroxide, Fenton and simulated solar photo-Fenton processes [15]; biodegradation [16], adsorption by bentonite [17,18], modified montmorillonites [19] and activated carbon [20]. Chemical oxidation is an efficient method, however considering the generation of the by-products that may be harmful to the process, it is not efficient in practice.…”

Section: Introductionmentioning

confidence: 99%

Effects of Residual Xanthate on Flotation Efficiency of a Cu-Zn Sulfide Ore

2022

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Reuse of process water in the flotation of sulfide ores has crucial importance for environmental sustainability and improved process economy. However, the chemistry of process water may be a critical subject for the flotation efficiency as the dissolved ion concentration increases with water reuse. In this study, the effects of water reuse on the flotation efficiency of a Cu-Zn sulfide ore were investigated. The flotation flowsheet consists of a pre-flotation section to remove the naturally floatable talc particles, and sequential copper and zinc flotation sections. Calcium, sulfate, thiosulfate, and xanthate were found as major contaminating ionic species in the process water discharged from flotation circuits. The flotation tests with recirculated water from the zinc rougher tailing revealed that the presence of residual xanthate caused unintentional activation of copper minerals in the pre-float section. Copper recovery increased in the pre-flotation section and resulted in the loss of copper to the pre-float concentrate, which is considered as a tailing stream in the current flowsheet. Various types of activated carbon samples were tested to remove the residual xanthate from the tailing water. The carbon samples could be regenerated by heat treatment and reused for water treatment. Performance of the activated carbon samples was directly related to the pore size and surface area. Carbon-treated tailing water could be re-used in flotation without affecting the flotation performance.

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Removal of ethyl, isobutyl, and isoamyl xanthates using cationic gemini surfactant-modified montmorillonites

Cited by 34 publications

References 45 publications

Dispersion of sodium phytate on muscovite and the implications for arsenopyrite flotation

Dispersion of sodium phytate on muscovite and the implications for arsenopyrite flotation

Uptake of Ethyl Xanthate to Metal Organic Frameworks

Effects of Residual Xanthate on Flotation Efficiency of a Cu-Zn Sulfide Ore

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