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Kinetic Study of the Acidic Leaching of a Domestic Copper Oxide Ore and Optimization of the Process Using Statistical Design of Experiments

SSRN, ISSN: 1556-5068
2022
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Metrics Details

  • Usage
    273
    • Abstract Views
      218
    • Downloads
      55
  • Ratings
    • Download Rank
      762,801

Article Description

Sulfuric acid leaching behavior of a complex oxide copper ore from Sungun copper mine with azurite and malachite as the main copper-containing phases and average copper content of 1.28wt.% was investigated using bottle roll leaching. The kinetic model governing the leaching process was determined. Measurement of copper recovery over time in different conditions showed that the leaching process was diffusion-controlled, and best fitted with an R value of 0.977 in the well-known D equation [Formula prestented], which suggests that the activities of the reactants control the diffusion process. Design of experiments (DOE) methods was used to characterize the leaching behavior and optimize the copper recovery using two software packages, namely, Minitab and Design Expert. Taking particle size, rolling speed, sulfuric acid concentration, and pulp density as the process variables, the obtained model included all linear, interaction, and quadratic terms with R, adjusted R, and predicted R values of 0.95, 0.91, and 0.84, respectively. The predicted optimized conditions targeting maximized recovery were concluded to be ore particle size of 3.95 mm, rolling speed of 120 rpm, the acid concentration of 12gl, and pulp density of 120gl. The application of the predicted optimum conditions to practical experiments resulted in an average copper extraction percentage of ~93%.

Bibliographic Details

Mohammad Amin Shariat-Ahmadi; Mandana Adeli; Mohammad Sh. Bafghi; Alireza Zakeri; Hadi Sharifidarabad

Elsevier BV

Multidisciplinary; Copper oxide ore; leaching; Kinetics; Design of experiments (DOE); Bottle roll; Optimization

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