Authors : Mungwa Kalundu Gaylord; Dumb Kayemb Syntyche; Ndala Mbavu Bavon; Zeka Mujinga

Volume/Issue : Volume 10 - 2025, Issue 10 - October

Google Scholar : https://tinyurl.com/bd3dbb58

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DOI : https://doi.org/10.38124/ijisrt/25oct826

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Abstract : This study seeks to resolve a practical problem encountered in solvent extraction. This problem relates to the copper extraction yield in the high-grade circuit. Between July and September 2024, constraints related to increased production and increased demand for HG raffinate led to an increase in feed flow, which increased transfer but resulted in a decrease in copper extraction yield to average values of 80%. Low extraction yield would mean potentially lower copper recovery at the stripping stage, raffinate richer in residual copper and, in addition, low overall plant productivity. The main objective of this research was therefore to improve copper extraction efficiency, taking into account the increase in feed flow rate, in order to ensure an optimal amount of copper transfer, which would enable the plant to meet its annual production targets. To do this, a sample of the discharged organic phase and another of the solution from the PLS leaching process were taken at the plant and then characterised for use in laboratory extraction tests. Thirty extraction tests were carried out, varying four parameters in turn to the following values: pH (1.2; 1.4; 1.6; 1.8; 2; 2.2 and 2.4), the O/A ratio (1/3, 1/2, 1, 2/1, 3/1, 4/1, 5/1), the residence time (1; 2; 3; 4 and 5 min) and agitation speed (400; 600; 800; 1000; 1200; 1500 and 1700 rpm). The optimum values for these parameters will be used to establish simulation isotherms in order to adapt the flow rate to the flowsheet. At the end of this study, the results obtained when applied to a simulation with ISOCALC showed that an efficiency of 84.76% could be achieved by feeding 900m3/h into a series-parallel circuit with a flow rate of 500m3/h on the series stages and 400m3/h on the parallel stage, with a parallel O/A ratio of 2.8, a pH of 1.28, a residence time of 3 minutes and an agitation speed of 100 rpm.3/h on the parallel stage at an O/A ratio of 2.8; a pH of 1.28; a residence time of 3 minutes with an agitation speed of 800 rpm for an organic extractant of 23.12%. These conditions would also minimise the co-extraction of iron to 31.32%. An extractant was added up to 28% under the same conditions and we obtained an extraction yield of 92.32% and a transfer of 277.15 tonnes/day.

Keywords : Solvent Extraction, Copper Extraction Efficiency, Hydrometallurgy, High Grade Circuit, Kamoto Copper Company (KCC), Process Optimization, Organic/Aqueous Ratio (O/A), LIX 984N, ISOCALC Simulation, Iron Co-Extraction, Series–Parallel Configuration, Feed Flow Rate, Loaded Organic, PLS, Copper Stripping.

References :

1. Anderson. (2007) - Operation of flottweg Tricanter centrifuge for crud teatement at Bwana Mukubwa solvent extraction plant, Ndola Zambia. pp. 340-404.
2. Ashbrock, G. (1984) - Solvent Extraction: Principles and application to process. Amsterdam : Elsevier, Vol. 1.
3. Cognis. (2005) – Guide pratique sur la conduite des usines d’extraction par solvant, Vue d’ensemble par Cognis Guerdouh, A. (2017) - Effet du Solvant sur l’extraction liquide-liquide du Cuivre (II) et du Chrome (III) par l’acide laurique et la Salicylidèneaniline, Génie des Procédés et Environnement, Université Mohamed Khider Biskra, p. 220, Thèse doctorale.
4. Hidaya, I. (2017) - Contribution à l’étude de l’extraction par solvant des aromatiques en vue de l’obtention des huiles lubrifiantes, Département de Génie des Procédés, Universite Kasdi Marbah Ouargla, p. 189, Thèse doctorale.
5. Hossein, D. (1999) - Modélisation et simulation des opérations d'extraction par solvant et d'électrolyse (SX-EW), Département des mines et métallurgie, Université de Laval, pp. 1059, Thèse doctorale.
6. Kabeya, D. (2019) - Etude comparative de trois types de configuration des étages de strippage S1 et S2 de l'usine hydrométallurgique de LUILU/KCC en vue d'une amélioration de ses performances, Polytechnique, Université de Lubumbashi, Mémoire de fin de cycle.
7. Nkulu,G. (2015) – Improving the efficiency of solvent extraction of copper by combination of hydroxyoximic extractants, international conference on metal solvent extraction, three gorges, China.
8. Nkulu, G. (2023) – Procédés hydrométallurgiques : cours inédit à l’usage des étudiants de troisième bachelier, Polytechnique, Université de Lubumbashi.
9. Rydberg et al. (2004) - Solvent extraction: principles and practice. 2e. New York: Taylor & Francis Group, LLC, 2004. pp. 11-35. ISBN 0-8247-5063-2.
10. Nzemba, K. (2023) -Optimisation du rendement d’extraction au circuit low grade (MMG)
11. Baba, A. A., Adekola, F. A., Bale, R. B., Okewole, B., & Folorunso, I. O. (2013). A review on hydrometallurgical extraction and recovery of copper. Journal of Minerals & Materials Characterization & Engineering, 1(1), 1–15.
12. Davenport, W. G., King, M., Schlesinger, M., & Biswas, A. K. (2011). Extractive Metallurgy of Copper (5th ed.). Elsevier.
13. Flett, D. S. (2019). Solvent extraction in hydrometallurgy: The role of organophosphorus extractants. Solvent Extraction and Ion Exchange, 37(4), 329–356.
14. Habashi, F. (1999). Hydrometallurgy: Principles and Applications. Metallurgie Extractive Québec.
15. Moyo, T., & Kime, M. (2014). Effect of phase ratio and agitation on copper extraction using LIX reagents. Hydrometallurgy Journal, 152, 67–74.
16. Mwema, M. (2016). Optimization of copper and cobalt extraction from oxidized ores in the Luilu Plant (DRC). Journal of African Mining Science, 8(3), 45–56.
17. Outotec. (2018). ISOCALC Software User Manual – Solvent Extraction Modeling. Outotec Oyj.
18. Ritcey, G. M. (2006). Solvent Extraction: Principles and Applications to Process Metallurgy (2nd ed.). Elsevier.
19. Schlesinger, M. E., Sole, K. C., & Davenport, W. G. (2013). Solvent extraction design and simulation in copper processing. Metallurgical Reviews, 58(2), 119–138.
20. Sole, K. C., & Hiskey, J. B. (2005). Solvent extraction in the hydrometallurgical processing and purification of metals. In M. A. Hanson (Ed.), Solvent Extraction Principles and Practice (pp. 917–944). Marcel Dekker.
21. Tutu, H., & Manda, B. (2017). Modelling and simulation of solvent extraction circuits in copper hydrometallurgy. Journal of the Southern African Institute of Mining and Metallurgy, 117(10), 1007–1016.