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Journal of Sustainable Metallurgy

, Volume 4, Issue 4, pp 470–484 | Cite as

Comparative Study of Simultaneous Removal Performance of Silica and Solid Colloidal Particles from Chalcopyrite Bioleachate Solution by Washing and Coagulation Methods

  • David Lukumu Bampole
  • Antoine F. Mulaba-Bafubiandi
Research Article
  • 62 Downloads

Abstract

Most of the surface reserves of copper minerals are oxidized while underground mining leads to rich silica–chalcopyrite–pyrite ore. Based on the challenges of the twenty-first century, the (bio)-hydrometallurgy processing is suggested as an alternative route to replace conventional techniques. However, the search for a sustainable metallurgy and/or more effective method to decrease impurities for efficient solvent extraction led to a comparative study of the removal performances of silica and solid colloidal particles from bioleachate solution by comparing the techniques using Shellsol set #2325 and Magnafloc set #1597, respectively. Three ratios (thinner/aqueous) or/and (coagulant /aqueous) of 1/2, 1, and 3/2 were assessed, along with the disengagement time and the required absorbed dose of Magnafloc 1597. The search for the alternative route also sought to ensure that the requirements in terms of concentration values at solvent extraction stage did not exceed 500 and 75 ppm, respectively. Findings show that the diluent/wash method is less efficient in terms of the removal performances of silica and solid colloidal particles from the bioleachate solution, but the phase disengagement time was similar, being comparatively around 150 s. The results of Magnafloc 1597 coagulation tests show removal performances of silica and colloidal particles from the bioleachate solution to be greater than 300 ppm, with a volume ratio of 1/1 for recovery rates of 68 and 58%, respectively, for SiO2 and colloidal solids in suspension. In comparison, the employment of Shellsol 2325 achieved silica removal efficiencies of 20.92 and 40%, respectively, of SiO2 and colloidal fine particles in suspension. A decreased phase separation time in aqueous continuity from 245 to 148 s has been recorded with a ratio of 1/1 (thinner or coagulant/aqueous). On the other hand, coagulant concentration of 300 ppm was retained. Hence, it could be assumed that the coagulation showed better results than the washing method.

Keywords

Silica Solid colloidal particles Bioleachate solution Greener environment Sustainable metallurgy 

Abbreviations

SX

Solvent extraction

PLS

Pregnant leach solution

PDT

Phase disengagement time

TSS

Total solids in suspension

Rpm

Revolution per minute

Rdt or Rec

Yield of the operation

AC

Aqueous continuity

CA

Continuity in aqueous phase

OC

Organic continuity

CO

Continuity in organic phase

Notes

Acknowledgements

The first author wishes to extend his gratitude not only to the University of Johannesburg (UJ), South Africa, for providing the means and facilities for this research—but also to the Mineral Processing &Technology Research Centre and the Metallurgy Department.

Compliance with Ethical Standards

Conflict of interest

All the authors declare that there are no conflict of interests to disclose in this study.

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Copyright information

© The Minerals, Metals & Materials Society 2018

Authors and Affiliations

  • David Lukumu Bampole
    • 1
    • 2
  • Antoine F. Mulaba-Bafubiandi
    • 1
  1. 1.Mineral Processing & Technology Research Centre, Department of Metallurgy, Faculty of Engineering and the Built EnvironmentUniversity of JohannesburgJohannesburgSouth Africa
  2. 2.Department of Industrial Chemistry, Faculty of PolytechnicUniversité de LikasiLikasiDemocratic Republic of the Congo

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