Effect of dissolved metal sulphates on gas-liquid oxygen transfer in agitated quartz and pyrite slurries

Zuidervaart, E; Reuter, M.A.; Heerema, RH; Lans, R. G. J. M. van der; Derksen, J. J.

doi:10.1016/s0892-6875(00)00138-2

Cited by 8 publications

(7 citation statements)

References 27 publications

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“…As explained by , Van't Riet (1979), andZuidervaart et al (2000), the mass transfer parameter k L a for aqueous, ionic solutions is higher than water. Koetsier et al and Van't Riet stated that the coalescence rate of gas bubbles in an aqueous, ionic solution is very low compared to water, resulting in an increase in k L a.…”

Section: Mass Transfer Parametersmentioning

confidence: 99%

The oxidation of Fe(II) with Cu(II) in acidic sulfate solutions with air at elevated pressures

Wermink¹,

Spinu²,

Versteeg

2018

Chemical Engineering Communications

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The oxidation of ferrous ions in acidic sulfate solutions in the presence of cupric ions at elevated air pressures was investigated in a high-intensity gas-liquid contactor. The study was required for the design of the regeneration steps of the novel Vitrisol V R desulphurization process. The effects of the Fe 2þ concentration, Cu 2þ concentration, Fe 3þ concentration, initial H 2 SO 4 concentration, and partial oxygen pressure on the reaction rate were determined at three different temperatures, i.e., T ¼ 50 C, 70 C, and 90 C. Most of the experiments were determined to be affected by the mass transfer of oxygen, and therefore true intrinsic kinetics could not be fully determined. An increase in Fe 2þ and Cu 2þ concentrations, as well as the partial pressure of oxygen and temperature, increased the Fe 2þ oxidation rate. H 2 SO 4 did not influence the Fe 2þ oxidation rate. An increase in Fe 3þ concentration decreased the Fe 2þ oxidation rate. Although determined from experiments partially affected by mass transfer, a first order of reaction in Fe 2þ was observed, fractional orders in both Cu 2þ and O 2 were measured, a zero order in H 2 SO 4 was determined, and a negative, fractional order in Fe 3þ was obtained. The activation energy was estimated to be 31.3 kJ/mol. KEYWORDS Gas-liquid reaction; H 2 S removal; Fe(II) oxidation; influence of Cu(II); mass transfer; reaction behavior Fe 2 ðSO 4 Þ 3 þ CuSðsÞ ! 2FeSO 4 þ CuSO 4 þ S o ðsÞ: (2)

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Section: Mass Transfer Parametersmentioning

confidence: 99%

The oxidation of Fe(II) with Cu(II) in acidic sulfate solutions with air at elevated pressures

Wermink¹,

Spinu²,

Versteeg

2018

Chemical Engineering Communications

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“…Zuidervaart et al 28 also observed that increasing the ionic strength by the addition of soluble metal sulphates to a quartz slurry increased the mass-transfer coefficient significantly. Other factors, however, probably contributed to the observation in the current investigation.…”

Section: Oxygen Mass Transfer Into Slurry In Presence Of Corrosion Inmentioning

confidence: 95%

Oxygen mass transfer into flotation slurries—Part 1: effect of mild steel corrosion during grinding of quartz

Khan¹,

Kelebek²

2001

Mineral Processing and Extractive Metallurgy

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“…Zuidervaart et al 16 concluded that the oxygen-water mass-transfer rate was enhanced by up to a factor of 250% when metal sulfate electrolytes [e.g., CuSO 4 , FeSO 4 , ZnSO 4 , and Al 2 (SO 4 ) 3 ] were added to the solution. The researchers mentioned above were focused on enhancing oxygen-water mass transfer, so it is of interest as to whether those results can be extended to CO-water mass-transfer enhancement.…”

Section: Introductionmentioning

confidence: 99%

“…Others have reported the use of additives such as surfactants, alcohols, salts, and small particles in the liquid as possible methods to enhance oxygen−water mass transfer. − Olle et al reported that the oxygen−water mass-transfer rate was enhanced by a factor of approximately 600% upon addition of magnetite (Fe 3 O 4 ) nanoparticles coated with oleic acid and a surfactant. Zuidervaart et al concluded that the oxygen−water mass-transfer rate was enhanced by up to a factor of 250% when metal sulfate electrolytes [e.g., CuSO 4 , FeSO 4 , ZnSO 4 , and Al 2 (SO 4 ) 3 ] were added to the solution. The researchers mentioned above were focused on enhancing oxygen−water mass transfer, so it is of interest as to whether those results can be extended to CO−water mass-transfer enhancement.…”

Section: Introductionmentioning

confidence: 99%

“…Their results indicated that, for a given superficial gas velocity ( u G ), the gas holdup is influenced by both the concentration and the chemical nature of the added electrolyte. Others have also suggested the addition of electrolytes can enhance gas−liquid mass transfer by reducing bubble coalescence. , Despite the results mentioned above, the cause of gas−liquid mass-transfer enhancement when electrolytes are added to a liquid remains inconclusive.…”

Section: Introductionmentioning

confidence: 99%

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Effect of Electrolytes on CO−Water Mass Transfer

Zhu

Shanks

Heindel

2009

Ind. Eng. Chem. Res.

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The influence of various electrolytes such as sulfate, nitrate, and chloride on CO-water mass transfer was investigated in this study. The results indicate that the enhancement in the CO-water volumetric masstransfer coefficient ranged from 1.5 to 4.7 times that of a baseline system without electrolytes, depending on electrolyte type and concentration. For those electrolytes with the same anions, copper-containing electrolytes provided stronger enhancement, whereas for those electrolytes with the same cations, sulfatecontaining electrolytes showed stronger enhancement. By measuring both the CO-water volumetric masstransfer coefficient (kLa) and the mass-transfer coefficient (kL), it was found that the electrolytes inhibit gas bubble coalescence. This leads to an increase in the gas-liquid interfacial area, resulting in CO-water masstransfer enhancement. In contrast, when MCM41 nanoparticles with or without functionalized mercaptopropyl groups were added to water, the mass-transfer coefficient and CO-water interfacial area were both increased. KeywordsMechanical Engineering, baseline systems, functionalized, gas bubbles, gas liquids, interfacial areas, masstransfer coeficients, water mass, chlorine compounds, coalescence, mass transfer The influence of various electrolytes such as sulfate, nitrate, and chloride on CO-water mass transfer was investigated in this study. The results indicate that the enhancement in the CO-water volumetric masstransfer coefficient ranged from 1.5 to 4.7 times that of a baseline system without electrolytes, depending on electrolyte type and concentration. For those electrolytes with the same anions, copper-containing electrolytes provided stronger enhancement, whereas for those electrolytes with the same cations, sulfate-containing electrolytes showed stronger enhancement. By measuring both the CO-water volumetric mass-transfer coefficient (k L a) and the mass-transfer coefficient (k L ), it was found that the electrolytes inhibit gas bubble coalescence. This leads to an increase in the gas-liquid interfacial area, resulting in CO-water mass-transfer enhancement. In contrast, when MCM41 nanoparticles with or without functionalized mercaptopropyl groups were added to water, the mass-transfer coefficient and CO-water interfacial area were both increased.

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Effect of dissolved metal sulphates on gas-liquid oxygen transfer in agitated quartz and pyrite slurries

Cited by 8 publications

References 27 publications

The oxidation of Fe(II) with Cu(II) in acidic sulfate solutions with air at elevated pressures

The oxidation of Fe(II) with Cu(II) in acidic sulfate solutions with air at elevated pressures

Oxygen mass transfer into flotation slurries—Part 1: effect of mild steel corrosion during grinding of quartz

Effect of Electrolytes on CO−Water Mass Transfer

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