Removal Performance of Silica and Solid Colloidal Particles from Chalcopyrite Bioleaching Solution: Effect of Coagulant (Magnafloc Set #1597) for Predicting an Effective Solvent Extraction

  • David Lukumu Bampole University of Johannesburg
  • Mulaba Bafubiandi University of Johannesburg

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Abstract

Silicon dioxide is a compound containing two of the most abundant elements in Earth’s crust. One of the main obstacles for upright solvent extraction in a copper (bio)-hydrometallurgical production chain relates to the high silica content and solid colloidal particles in the pregnant leach solution (PLS) during the treatment chain. This study assesses by way of laboratory tests the removal performance of silica and fine colloidal particles in the bioleachate solution. Their concentration requirement at solvent extraction stage could not exceed 500 ppm and 75 ppm respectively. The contact time and three ratios (coagulant/PLS): 1/2; 1/1 and 1/3 settled. The removal method from coagulation with Magnafloc (set #1597) was performed by varying its concentration in contact with the bioleachate solution. The coagulation tests consisted of finding optimal conditions with the coagulant from 0.50 to 1000 ppm, while outcomes related to the interaction of bioleached solution with coagulant consisted of the search for the optimal ratio (volume ratio). From the above, the outcomes of coagulation tests revealed a removal optimisation of silica and solid colloidal particles from bioleachate solution, which has to be greater than 200 ppm, either 300 ppm and up, keeping a volume ratio of 1/1, for a recovery rate of 68% and 58% respectively for a removal efficiency of SiO2 and solids in suspension. A reduction of the phase separation time in aqueous continuity was observed from 230 to 148 seconds. It can be noted from the results mentioned above that the removal method will promote an effective copper solvent extraction stage, affecting the operating cost and greener environment with the possibility for recycling the organic wastes.

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Author Biographies
David Lukumu Bampole

Mineral Processing & Technology Research Centre, Department of Metallurgy, Faculty of Engineering and the Built Environment, University of Johannesburg, 2028, Doornfontein Campus, P.O. Box 17911. South Africa


Universite de Likasi, Department de chimie industrielle Faculte polytechnique, Congo

Mulaba Bafubiandi

Mineral Processing & Technology Research Centre, Department of Metallurgy, Faculty of Engineering and the Built Environment, University of Johannesburg, 2028, Doornfontein Campus, P.O. Box 17911. South Africa

Published
Vol 22 No 5, Sep 30, 2018
How to Cite
D. Bampole and M. Bafubiandi, “Removal Performance of Silica and Solid Colloidal Particles from Chalcopyrite Bioleaching Solution: Effect of Coagulant (Magnafloc Set #1597) for Predicting an Effective Solvent Extraction”, Eng. J., vol. 22, no. 5, pp. 123-139, Sep. 2018.

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