Kinetics of dissolution of synthetic covellite in aqueous acidic ferric sulphate solutions

Thomas, George J.; Ingraham, T. R.

doi:10.1179/cmq.1967.6.2.153

Cited by 26 publications

(17 citation statements)

References 12 publications

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“…This conclusion can be supported by the investigations conducted by Thomas and Ingraham [25]. These two researchers investigated the effect of temperature on the dissolution of pure covellite in a 0.1-M H 2 SO 4 solution with the addition of iron (III) sulphate the concentration of which was 13 g/l Fe 3+ ions.…”

Section: The Effect Of Temperaturementioning

confidence: 50%

Investigation of the possibility of copper recovery from the flotation tailings by acid leaching

Antonijević

Dimitrijević

Stevanović

et al. 2008

Journal of Hazardous Materials

105

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Section: The Effect Of Temperaturementioning

confidence: 50%

Investigation of the possibility of copper recovery from the flotation tailings by acid leaching

Antonijević

Dimitrijević

Stevanović

et al. 2008

Journal of Hazardous Materials

105

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“…The relative insensitivity of the covellite dissolution rate to all "normal" ferric ion concentrations is of interest since it means that the maximum rate would be obtained at all ferric strengths likely to be encountered during actual comlnercial leaching. Table I indicates that, with the exception of King (9), all previous workers have found the covellite dissolution reaction to be either independent of changes in the ferric ion concentration above a certain level (4, 8,11) or to be only slightly dependent on this variable (10). There also seems to be general agreement that the critical Fe 3 + concentration above which the dissolution rate is independent of the ferric strength is 0.005 M Fe 3 +.…”

Section: Effect Of Ferric Ion Concentrationmentioning

confidence: 91%

The kinetics of dissolution of covellite in acidified ferric sulphate solutions

Dutrizac¹,

MacDonald²

1974

Canadian Metallurgical Quarterly

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Pure synthetic CuS disks and high-grade natural covellite were dissolved in acidified ferric sulphate solutions in the temperature range 25 to 95°C. For both materials, the rates were relatively slow and increased during the initial stages of the dissolution, eventually becoming nearly linear. The activation energy, as determined from the initial dissolution rates of the synthetic covellite, was 17.8 ± 2.0 kcal/mole. Microscopic examination of both the natural and the synthetic sulphide revealed that the attack occurred preferentially in certain areas. It was felt that the progressive development of such pits was responsible for the gradual rate increase observed during the initial leaching stage. From 0 to 6% of the leached sulphur reported in the sulphate form. The rate of copper dissolution decreased sharply with increasing ferrous sulphate concentrations in the leaching medium. The rate varied directly with the ferric concentration for initial concentrations below 0.005 M Fe3+ but was insensitive to higher ferric strengths. Natural covellite dissolved at approximately the same rate and with essentially the same temperature dependence as the synthetic material. The rate controlling step for the dissolution of CuS was felt to be a chemical reaction occurring on the surface of the sulphide.

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“…Thomas and Ingraham reported a first-order dependency in Fe 3+ for Fe 3+ concentrations below 0.005 M, and a zero-order dependency for Fe 3+ concentrations above 0.005 M.…”

Section: Literature Reviewmentioning

confidence: 97%

“…Thomas and Ingraham studied the dissolution of synthetic covellite disks in acidic ferric sulfate solutions. Covellite was synthesized from metallic copper and elemental sulfur and subsequently ground, pelletized, and sintered.…”

Section: Literature Reviewmentioning

confidence: 99%

“… a Thomas and Ingraham reported a first-order dependency in Fe 3+ for Fe 3+ concentrations below 0.005 M, and a zero-order dependency for Fe 3+ concentrations above 0.005 M. b Thomas and Ingraham reported an activation energy of 92.1 kJ/mol for temperatures ranging from 25 to 60 °C and an activation energy of 33.5 kJ/mol for temperatures ranging from 60 to 80 °C. c Mulak reported a first-order dependency in Fe 3+ for Fe 3+ concentrations below 8.95 × 10 –5 M, and a zero-order dependency for Fe 3+ concentrations above 8.95 × 10 –5 M. d Dutrizac and MacDonald reported a first-order dependency in Fe 3+ for Fe 3+ concentrations below 0.005 M, and a zero-order dependency for Fe 3+ concentrations above 0.005 M. e Dutrizac and MacDonald reported an activation energy of 74.5 kJ/mol for synthetic covellite and an activation energy of 82.0 kJ/mol for natural covellite. …”

Section: Literature Reviewmentioning

confidence: 99%

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Dissolution of CuS Particles with Fe(III) in Acidic Sulfate Solutions

Wermink¹,

Versteeg

2018

Ind. Eng. Chem. Res.

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The dissolution of CuS particles with Fe 3+ in acidic sulfate solutions was investigated in an oxygen-free environment. CuS particles, used in this study, were obtained from H 2 S removal operations from biogas with an acidic CuSO 4 solution in a Vitrisol pilot absorber. The CuS particles were porous with an average diameter of 5.8 × 10 −6 m. Zero orders of reaction for both Fe 3+ and H 2 SO 4 were determined. Full conversion of CuS could be obtained independent of temperature. The activation energy was determined to be E A = 22.0 kJ/ mol. It seems plausible that the CuS dissolution reaction was affected by diffusion.

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Kinetics of dissolution of synthetic covellite in aqueous acidic ferric sulphate solutions

Cited by 26 publications

References 12 publications

Investigation of the possibility of copper recovery from the flotation tailings by acid leaching

Investigation of the possibility of copper recovery from the flotation tailings by acid leaching

The kinetics of dissolution of covellite in acidified ferric sulphate solutions

Dissolution of CuS Particles with Fe(III) in Acidic Sulfate Solutions

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