Determination of a semi empirical kinetic model for dissolution of metallic copper particles in HNO3 solutions

Demir, Hülya; Özmetin, Cengiz; Kocakerìm, M. Muhtar; Yapıcı, Sinan; Çopur, Mehmet

doi:10.1016/j.cep.2003.11.002

Cited by 20 publications

(7 citation statements)

References 8 publications

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“…After comparing different models, it was found that the shrinking core model for a cylindrical geometry suits to the experimental data (Fig. 9) 49,50 . A reaction controlled system was determined for gold-iodine leaching.…”

Section: Resultsmentioning

confidence: 79%

Kinetic Investigation and Dissolution Behavior of Cyanide Alternative Gold Leaching Reagents

Birich

Stopić

Friedrich

2019

Sci Rep

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Raising social awareness and environmental specifications on cyanide application force gold industry to search for alternative leaching reagents. Therefore, researchers worldwide investigate cyanide alternatives for gold recovery since several decades. Often the research activities cannot be compared directly, since different input materials and experimental conditions are used. Over the course of this study, different promising cyanide alternative reagents were investigated in terms of their capability of pure gold dissolution at different temperatures. All experiments took place under identical conditions by using uniform samples of 99.99% gold disks, to enable a comparability. Thiosulfate as one of the most promising reagent thiosulfate according to literature revealed an insufficient leaching behavior. The gold dissolution was hindered due to the formation of a sulfide passive layer. Also in the thiourea trials, a surface precipitation took place, though gold dissolution did not stop. The halogens iodine, bromine and the well-known gold solvent aqua regia dissolved gold very fast (up to ~1,000 mg·h −1 ·cm −2 ). Methanosulfonic acid (MSA) was not capable to extract any gold. The experiments were compared with cyanide trials at identical conditions. The average dissolution rate of investigated reagents at 25 °C shows following order: aqua regia > iodine > bromine > cyanide > thiourea > thiosulfate > MSA.

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Section: Resultsmentioning

confidence: 79%

Kinetic Investigation and Dissolution Behavior of Cyanide Alternative Gold Leaching Reagents

Birich

Stopić

Friedrich

2019

Sci Rep

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“…The equations relating the fractional conversion of solid (X) as function of reaction time (t ) and k exp (experimental rate constant) are described below (e.g. [Costa and Sousa Lobo, 2001, Demir et al, 2004, Reyes et al, 2017, Senanayake, 2011]:…”

Section: Dissolution Rate Modellingmentioning

confidence: 99%

Oxidative transformation of Tungsten (W) nanoparticles potentially released in aqueous and biological media in case of Tokamak (nuclear fusion) Lost of Vacuum Accident (LOVA)

Sobrido¹,

Bernard²,

Angeletti³

et al. 2021

Comptes Rendus. Géoscience

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“…Fluid + Solid Reactants → Fluid and solid product (9) Solid Reactants → Fluid products (10) Solid Reactants → Fluid and solid products (11) In reactions with the excessive liquid phase, the concentration is considered to remain constant during the reaction. 33,35,38,41,47 The equations that is applied to systems where such a liquid component is constant and our evaluations of the results for different models are given in Table 3.…”

Section: Homogeneous Reactionsmentioning

confidence: 99%

“…The variation shape of solid products and solid/ liquid interaction can cause undesired results. [42][43][44][45][46][47] The reactions that will occur are listed below. In reactions with the excessive liquid phase, the concentration is considered to remain constant during the reaction.…”

Section: Kinetic Evaluation Of Ulexite Dissolution In Boric Acid Solutionmentioning

confidence: 99%

Investigation dissolution behaviours and kinetics parameters of ulexite in boric acid solution

Çalımlı

Tunç

Kocakerìm

2020

International Journal of Chemistry and Technology

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Nowadays, boron and its derivatives are widely used in industrial and technological areas. Boron minerals are the main sources for obtaining pure boron chemicals in the usage of different applications such as the defense industry, health, industry, kitchen equipments, etc. In this paper, for the first time, it has been reported the dissolution behaviors and kinetics parameters of ulexite in the boric acid solution. To solve ulexite by boric acid is important, because boric acid as a solvent prevents the formation of impurities, and therfeore our study is a first in the literature. In this context, the dissolution of the ulexite has been investigated under various experimental parameters such as temperatures, acid concentration, solid/liquid ratio, particle size, dissolution rate, and stirring speed. The experimental findings shown that the dissolution kinetics of ulexite increase with an increase in temperature and acid concentration and a decrease in particle size, but decrease with mixing speed in the acid. Moreover, the dissolution of ulexite in boric acid and activation energy were evaluated. As a result, it was found that the dissolution kinetics were compatible with the chemical control model and the activation energy was 22.024 kJ mol-1 .

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Determination of a semi empirical kinetic model for dissolution of metallic copper particles in HNO3 solutions

Cited by 20 publications

References 8 publications

Kinetic Investigation and Dissolution Behavior of Cyanide Alternative Gold Leaching Reagents

Kinetic Investigation and Dissolution Behavior of Cyanide Alternative Gold Leaching Reagents

Oxidative transformation of Tungsten (W) nanoparticles potentially released in aqueous and biological media in case of Tokamak (nuclear fusion) Lost of Vacuum Accident (LOVA)

Investigation dissolution behaviours and kinetics parameters of ulexite in boric acid solution

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