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Physicochemical Problems of Mineral Processing

Tytuł artykułu

Mechanism and leaching kinetics of molybdenite concentrate in a hydrogen peroxide-acid system

Autorzy Aracena, Alvaro  Azocar, Alan  Ibáñez, Juan Patricio  Jerez, Oscar 
Treść / Zawartość
Warianty tytułu
Języki publikacji EN
EN The mechanism and leaching kinetics of a molybdenite concentrate in a H2O2-H2SO4 system were studied. The experimental work was performed in a batch reactor equipped with a condenser, a mechanical agitator and a temperature control system. The effects of the temperature, H2O2 and H2SO4 concentrations, particle size, liquid/solid ratio and agitation speed on the Mo recovery were investigated. The thermodynamic results showed that the leaching mechanism it was governed by several intermediate reactions; however, the influences of sulfuric acid and passivation were not observed in the reaction. The most predominant experimental result was the maximum Mo recovery of 81.3% by leaching 64 μm particles at 333 K (60 °C) for 5400 s (90 min). The molybdenum recovery was generally enhanced by increasing the H2O2 and H2SO4 concentrations. However, at H2SO4 concentrations higher than 1.0 mol/dm3, the Mo recovery decreased. Although the agitation speed affected the Mo recovery considerably, high recoveries could be still obtained without mixing. The experimental results and XRD analysis confirmed the reaction mechanisms. The leaching kinetics were analyzed using a shrinking core model in which the rate was controlled by diffusion through a porous layer with radius ro. The reaction rate orders were 1.0 and 0.2 for the H2O2 and H2SO4 concentrations, respectively, and the rate was inversely proportional to the square of the initial particle radius. The calculated activation energy was 75.2 kJ/mol in the temperature range of 278-333 K (5-60 °C).
Słowa kluczowe
EN molybdenite concentrate   hydrogen peroxide   kinetics   mechanism of reaction  
Wydawca Oficyna Wydawnicza Politechniki Wrocławskiej
Czasopismo Physicochemical Problems of Mineral Processing
Rocznik 2019
Tom Vol. 55, iss. 1
Strony 140--152
Opis fizyczny Bibliogr. 9 poz., rys., tab.
autor Aracena, Alvaro
  • Escuela de Ingeniería Química, Pontificia Universidad Católica de Valparaíso, Avenida Brasil 2162, Cod. Postal 2362854, Valparaíso, Chile,
autor Azocar, Alan
  • Departamento de Ingeniería Metalúrgica y de Materiales, Universidad Técnica Federico Santa María, Avenida España 1680, Valparaíso, Chile
autor Ibáñez, Juan Patricio
  • Departamento de Ingeniería Metalúrgica y de Materiales, Universidad Técnica Federico Santa María, Avenida España 1680, Valparaíso, Chile
autor Jerez, Oscar
  • Instituto de Geología Económica Aplicada (GEA), Universidad de Concepción, Casilla 160-C, Concepción, Chile
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MADEJA AS., 2011. Kinetics of Mo, Ni, V and Al leaching from a spent hydrodesulphurization catalyst in a solution containing oxalic acid and hydrogen peroxide. J. Hazard Mater. 186. 2157-2161
ROINE A., 1999. HSC Chemistry 6.0. Pori, Finlandia: OutoKumpu Research Py
SHON HY. and WADSWORTH ME., 1979. Rate processes of extractive metallurgy. New York: Plenum Press
Opracowanie rekordu w ramach umowy 509/P-DUN/2018 ze środków MNiSW przeznaczonych na działalność upowszechniającą naukę (2019).
Kolekcja BazTech
Identyfikator YADDA bwmeta1.element.baztech-ab1b92fa-ea0a-4b48-82a2-0afff3addf41
DOI 10.5277/ppmp18139