Leaching and kinetic modeling of calcareous bornite in ammonia ammonium sulfate solution with sodium persulfate

Liu, Zhi Xiong; Yin, Zhou Lan; Xiong, Shao Feng; Chen, Yi Guan; Chen, Qi Yuan

doi:10.1016/j.hydromet.2014.01.011

Cited by 31 publications

(14 citation statements)

References 21 publications

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“…However, the recovery of copper by conventional pyrometallurgical techniques is associated with the undesirable emissions of harmful sulfur oxides into the atmosphere [6,7]. Moreover, rapid economic and technical developments have resulted in an increasing demand for copper and gradual depletion of copper sulfide ores [8][9].…”

Section: Introductionmentioning

confidence: 99%

Leaching of Copper from Malachite with Methane-sulfonic Acid

Feng

Wen

Zhao

et al. 2015

SERDJ

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The process of leaching copper from malachite using methane-sulfonic acid (MSA) as an organic leaching reagent was investigated in this study. The effects of acid concentration, reaction temperature, particle size, and stirring speed on the copper leaching fraction were determined. Results indicated that leaching reagent concentration and reaction temperature exerted significant effects on copper extraction, whereas particle size and stirring speed exerted a relatively minor effect on the leaching rate. The kinetics of the dissolution process followed the shrinking core model, and a new kinetic model was found suitable to represent the rate-controlling step. The apparent activation energy of this process was determined to be 24.48 kJ/mol, and a semi-empirical rate equation was obtained to describe the process.

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Section: Introductionmentioning

confidence: 99%

Leaching of Copper from Malachite with Methane-sulfonic Acid

Feng

Wen

Zhao

et al. 2015

SERDJ

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“…However, chalcopyrite was leached out partly, with the oxygen dissolved in the solution as an oxidant [6]. Liu [11] has reported that the copper sulfides can be oxidized and dissolved effectively in ammonia solution with sodium persulfate as an oxidant, so we can infer that a more efficient oxidant will promote the dissolution of copper sulfides during bioleaching. Figure 8 shows the results of the comparison of bioleaching and chemical leaching at the pulp density of 1%.…”

Section: Phase Transformation Of Copper Ore After Bioleachingmentioning

confidence: 99%

“…Ammonia has been extensively used as an effective lixiviant in copper leaching [11,12]. Ammonia leaching can solve the corrosion problems encountered in the acidic systems and extract copper from ore selectively, leaving undesired components in the residue [9].…”

Section: Introductionmentioning

confidence: 99%

A New Heterotrophic Strain for Bioleaching of Low Grade Complex Copper Ore

Wang

et al. 2016

Minerals

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Abstract:A new heterotrophic strain, named Providencia sp. JAT-1, was isolated and used in bioleaching of low-grade complex copper ore. The strain uses sodium citrate as a carbon source and urea as a nitrogen source to produce ammonia. The optimal growth condition of the strain is 30˝C, initial pH 8, sodium citrate 10 g/L and urea 20 g/L, under which the cell density and ammonia concentration in the medium reached a maximum of 4.83ˆ10 8 cells/mL and 14 g/L, respectively. Ammonia produced by the strain is used as the main lixiviant in bioleaching. Bioleaching results revealed that higher strain growth led to a higher copper recovery, while higher pulp density will cause a greater inhibitory effect on strain growth and ammonia production. The copper extraction reached the highest value of 54.5% at the pulp density of 1%. Malachite, chrysocolla and chalcocite are easy to leach out in this bioleaching system while chalcopyrite is difficult. Results of comparative leaching experiments show that bioleaching using JAT-1 is superior to ammonia leaching at the same condition. The metabolites produced by the strain other than ammonia are also involved in bioleaching.

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“…Shrinking core model had been reported to be applied in the fluid extraction and leaching process, laying a foundation for the application of finite reaction model in bioactive components extraction from plants (Jin et al, 2012;Liu et al, 2014). In the finite reaction model, the fluid fraction can pass through the "reaction interface" referred to in the shrinking core model and penetrate into the area with a certain thickness inside the solid substrate particles.…”

Section: Finite Reaction Model Of Flavonoids Extraction From Fig Leafmentioning

confidence: 99%