Clarification and solvent extraction studies of a high talc containing copper aqueous solution

Mbuya, Bienvenu; Kime, Méschac-Bill; Kabeya, César Muteba; Kaniki, Arthur Tshamala

doi:10.1016/j.jmrt.2017.05.014

Cited by 3 publications

(5 citation statements)

References 2 publications

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“…They noticed that copper recoveries were 97.63%, 95.13% and 98.98% with rheomax® DR 1050, senfloc® 2660 and brontë 103 respectively. It can be noted that in their studies, the low residual suspensoids were referred to be low 1000 ppm (working industrial conditions) but not the norms as mentioned above (≤75 ppm) and ≤50 ppm [36]. This difference with our findings is also related to the physical characteristics of the TSS and the paradigm of the required concentration for TSS removal.…”

Section: Effect Of Coagulant Dose Silica [Sio2] Concentration and Socontrasting

confidence: 85%

“…This difference with our findings is also related to the physical characteristics of the TSS and the paradigm of the required concentration for TSS removal. The comparison of our findings with those of reference [36] shows that their results are still critical, based on cruds formation, which can occur after solvent extraction (stripping and electrowining) depending on the TSS and silica concentration required for efficient SX. However, their phase's disengagement time were better than the phase disengagement time obtained in our experiment.…”

Section: Effect Of Coagulant Dose Silica [Sio2] Concentration and Sosupporting

confidence: 50%

“…It can be confirmed that fine particles in suspension and colloidal silica contained in the aqueous phase are also responsible for the slowing down of phase separation to solvent extraction. However, our findings compared with studies carried out by [36] with a pregnant leachate solution containing 2000 ppm of TSS by using rheomax® DR 1050, senfloc® 2660 and brontë 103 respectively. It was noted that, under optimal conditions, set flocculant /aqueous or ratio of 1.5 with a a dose of flocculant of 116.28 g/t, the residual concentrations of total suspended solids in the leachate solutions were 1196 ppm, 928 ppm and 954 ppm respectively.…”

Section: Effect Of Coagulant Dose Silica [Sio2] Concentration and Somentioning

confidence: 74%

“…The optimal dose is found in this area and it will also depend on economic parameters. It will be retained at the end of this study of destabilisation of suspended particles using coagulant as MG1597 that deals with silica and solid colloidal particles, which is in two forms: the dissolved form and the colloidal form [36]. The coagulation tests shed light that, each time varying the dose of the coagulant, the problem related to the colloid clearance could be solved largely by treating PLS with the coagulant and with a dose of MG1597 greater than 250 mg/L, as per the rating requirement for effective solvent extraction: a solids content in suspension of less than 75 ppm in the aqueous phase; a content of less than 500 ppm in the copper sulphate solution.…”

Section: Performance Analysismentioning

confidence: 99%

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

Bampole¹,

Bafubiandi²

2018

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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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Section: Effect Of Coagulant Dose Silica [Sio2] Concentration and Socontrasting

confidence: 85%

Section: Effect Of Coagulant Dose Silica [Sio2] Concentration and Sosupporting

confidence: 50%

Section: Effect Of Coagulant Dose Silica [Sio2] Concentration and Somentioning

confidence: 74%

Section: Performance Analysismentioning

confidence: 99%

See 2 more Smart Citations

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

Bampole¹,

Bafubiandi²

2018

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“…4, it is shown that the settling tests with the anionic (Bronté and APAM) yielded good metallurgical performance with a settling velocity of 0.42 m/h and a settling surface of 0.40 m 2 /t/h. This behavior would be attributable to the flocculant properties such as high molecular weight and a large number of active sites on the hydrocarbon chain, added to the physicochemical natures of the ore samples [22].…”

Section: Statistical Treatment Of the Datamentioning

confidence: 99%

Evaluation of Flocculation and Settling Behavior of Leach Residues: Contribution of Principal Component Analysis

Mbuya¹,

Kime

Ntakamutshi

et al. 2018

J. Sustain. Metall.

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Chemical treatment is the best technology for the purification of copper-cobalt aqueous solutions because of its ability to remove suspended solids detrimental to downstream processes. However, the lack of optimization and adaptation of this method for the purification of the solutions obtained from the leaching of copper-cobalt ores with high mineralogical variability leads to significant fluctuations in the efficiency of the purification. This work investigated the batch settlingflocculation of fine solid particles (Al 2 O 3 and SiO 2) from copper-cobalt aqueous solutions using different flocculants (Brontë 234, APAM D8625-10, and CPAM D9640). The experimental variables comprised flocculant type, flocculant dosage, solids concentration, settling area, settling rate, % Al 2 O 3 , % SiO 2 , and particle size. The experimental 12 9 7 matrix was analyzed by principal component analysis, and the resulting principal components (PCs) and Varimax rotated PCs were analyzed using correlation circle plots. The most important settling variables proved to be the solids concentration, together with % Al 2 O 3 and particle size. High settling rate (0.42 m/h) and low settling surface (0.40 m 2 /t/h) were obtained at the flocculant dosage of 20 g/t. In addition, good settling performance was obtained with anionic flocculants (APAM D8625-10 and Bronté 234) rather than the cationic flocculant considered (CPAM D9640). Keywords Multivariate analysis Á Principal component analysis Á Settling Á Flocculation Á Cu-Co ores Á Leaching Á Concentrates The contributing editor for this article was Gabrielle Gaustad.

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Geometallurgy of Cobalt Black Ores in the Katanga Copperbelt (Ruashi Cu-Co Deposit): A New Proposal for Enhancing Cobalt Recovery

et al. 2022

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Copper-cobalt deposits in the Central African Copperbelt belong to the Sediment-Hosted Stratiform Copper (SHSC) type and are situated in the Neoproterozoic Katanga Supergroup. This paper describes in detail the geology, geochemistry and hydrometallurgy of cobalt, with a special focus on the Black Ore Mineralised Zone (BOMZ) unit from the Ruashi Cu-Co deposit as a case study. Based on results from fieldwork and laboratory testing, it was concluded that the BOMZ consists of a succession of massive and stratified dolostones, which are weathered into carbonaceous clay dolostones and clays. The Lower “Calcaire à Minéreaux Noirs Formation” (Lower CMN Formation) consists of stratified and finely laminated dolostones, which are weathered at the surface into clayey to siliceous dolostones. The cobalt concentration in the weathering zone is due to supergene enrichment, a process that is linked to the formation of a cobalt cap. The ore consists of heterogenite associated with minor amounts of chrysocolla and malachite. Minor carrollite, chalcopyrite, chalcocite and bornite are present in unweathered fragments. The cobalt grade in both the BOMZ and Lower CMN decreases within depth while the copper grade increases. These grade changes reflect the variation in mineralogy with depth from heterogenite with minor amounts of malachite and chrysocolla to malachite, chrysocolla with traces of heterogenite, spherocobaltite, chalcocite, chalcopyrite, carrollite and bornite. Based on the Cu (100xAS Cu/TCu) and Co ratio (100 xAS Co/TCo), which is related to the ore mineralogy, oxide ores (Cu ratio ≥ 75%) and oxide dominant mixed ores (Cu ratio < 75%, containing the copper sulphide chalcocite) can be differentiated in both the BOMZ and Lower CMN. The absence of talc and the low concentration of Ni, Mn and Fe, on the one hand, and the high-grade Cu in the BOMZ, on the other hand, facilitate the hydrometallurgy of cobalt but require a specific processing. Consequently, the recovery of Co from the BOMZ requires the application of a processing method that is based on sulphuric acid (30 g/L) leaching under reducing conditions (300–350 mV) and the removal of impurities (Cu > 95% and Mn ≈ 99%) from the pregnant leach solution (PLS) by solvent extraction (SX) prior to the precipitation of cobalt as a high-grade hydroxide (40.5%). The sulphuric acid leaching of the BOMZ enabled achieving, after 8 h of magnetic stirring (500 rpm), a highest yield of 93% Co, with other major elements Mn (84%) and Cu (40%). The latter forms a main co-product of the Co exploitation. In contrast, the highest leaching yield for Fe remained smaller than 5%.

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Clarification and solvent extraction studies of a high talc containing copper aqueous solution

Cited by 3 publications

References 2 publications

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

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

Evaluation of Flocculation and Settling Behavior of Leach Residues: Contribution of Principal Component Analysis

Geometallurgy of Cobalt Black Ores in the Katanga Copperbelt (Ruashi Cu-Co Deposit): A New Proposal for Enhancing Cobalt Recovery

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