The kinetics of leaching galena concentrates with ferric methanesulfonate solution

Wu, Zhenghui; Dreisinger, David; Urch, Henning; Fassbender, Stefan

doi:10.1016/j.hydromet.2013.10.017

Cited by 42 publications

(12 citation statements)

References 13 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Meanwhile, MSA has certain excellent properties, such as high conductivity, stability against volatilization and hydrolysis, and low corrosiveness and toxicity [24][25][26]. Besides, aqueous copper methanesulfonate can be directly used in electroplating and in the electronics industry.…”

Section: Introductionmentioning

confidence: 99%

Leaching of Copper from Malachite with Methane-sulfonic Acid

Feng

Wen

Zhao

et al. 2015

SERDJ

View full text Add to dashboard Cite

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.

show abstract

Section: Introductionmentioning

confidence: 99%

Leaching of Copper from Malachite with Methane-sulfonic Acid

Feng

Wen

Zhao

et al. 2015

SERDJ

View full text Add to dashboard Cite

show abstract

“…Among others, these properties established the use of MSA in various hydrometallurgical and electrometallurgical processes. Several authors reported the use of MSA in the leaching of malachite [8], chalcopyrite [9], jarosite [10], galena [11], cerussite [12], hemimorphite [13] or in the refining of lead [14].…”

Section: Methanesulfonic Acid In Leaching and Metal Recovery-a Literature Reviewmentioning

confidence: 99%

Refining of Precious Metal Bearing Materials from Secondary Sources-Methanesulfonic Acid Leaching of Raw Silver Granules as a Promising Approach towards a Green Way of Silver Refining

et al. 2021

View full text Add to dashboard Cite

The state-of-the-art technology of raw silver refining in a silver nitrate-based electrorefining process (Moebius-electrolysis) is accompanied by several disadvantages, both from a technological and from an ecological point of view. In addition, increasing concentrations of critical impurities from secondary sources, like palladium, in raw silver are a further challenge for the future of silver refining. Thus, there is strong motivation for the development of an adequate, alternative process of raw silver refining to substitute the existing Moebius-electrolysis. Due to its less environmentally toxic character and the high aqueous solubility of its silver salt, methanesulfonic acid (MSA) is a possible base chemical for the design of an efficient refining method based on leaching of raw silver followed by electrowinning, with less ecological and technological complications. In this paper the results of some fundamental investigations on the leaching of raw silver granules, containing approx. 94% silver, with methanesulfonic acid and hydrogen peroxide as an oxidation agent are presented. Agitation leaching experiments were conducted on a laboratory scale and the effects of the solid concentration, the hydrogen peroxide dosage and the temperature as leaching parameters were studied. The obtained results indicate that silver leaching yields of more than 90% are achievable with leaching at elevated temperatures of 65 °C or 80 °C, solid concentrations of 500 g/L and at a stoichiometric H2O2:Ag-ratio of 3:1. Increased solid concentrations greater than 500 g/L and elevated temperatures of 65 °C or 80 °C additionally improved the selectivity of the process regarding the leaching of Pd.

show abstract

“…When reaction temperature increases from 50°C to 90°C, the leaching rate of roasting products enhances from 84.67% to 98.60%. The reason for significant improvement on the leaching rate most likely is that the increase of temperature accelerates the molecules thermal motion and increases the contact surface between single particle and leaching agent, and that the barrier of products layer becomes thinner and diffusion flux increases with the temperature rising [21]. Additionally this result could also be attributed to the fact that reaction takes place only among effective colliding particles, and it is in line with the fact that particles which obtain more kinetic energy collide more frequently while a substance is heated.…”

Section: Effect Of Temperature On Leaching Efficiencymentioning

confidence: 99%