Recovery of Cobalt from Copper Slags

Yücel, Onuralp; Addemir, O.; Tekin, Ahmet; Nizamoglu, S.

doi:10.1080/08827509208914078

Cited by 24 publications

(5 citation statements)

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“…The results show that the recoveries of valuable metals in EF slag cleaning can be affected by the reduction time, the amount and quality of the used reductant and the settings (power etc.) of the furnace [38,79].…”

Section: Discussionmentioning

confidence: 99%

Battery Scrap and Biochar Utilization for Improved Metal Recoveries in Nickel Slag Cleaning Conditions

et al. 2020

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Cobalt is a critical, high-value metal used extensively in batteries and other sustainable technologies. To secure its supply in future, it is utmost important to recover cobalt efficiently from industrial wastes and recycled End-of-Life batteries. This study aims at finding ways to improve the reduction of cobalt as well as valuable metals nickel and copper in nickel slag cleaning furnace conditions by using both traditional fossil-based coke and a more sustainable option, low-CO2 footprint biochar, as reductants. A cobalt-rich fraction of battery scrap (25.5 wt% Co) was also used as a secondary feed. The experimental technique consisted of reduction experiments with different times at 1400 °C under inert atmosphere, quick quenching and Electron Probe X-ray Microanalysis. The use of biochar resulted in faster reaction kinetics in the reduction process, compared to coke. Moreover, the presence of battery scrap had a clear impact on the behavior and reduction kinetics of the elements and/or enhanced settling and separation of matte and slag. The addition of scrap increased notably the distribution coefficients of the valuable metals but consequently also the iron concentration in matte which is the thermodynamic constraint of the slag cleaning process.

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Section: Discussionmentioning

confidence: 99%

Battery Scrap and Biochar Utilization for Improved Metal Recoveries in Nickel Slag Cleaning Conditions

et al. 2020

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“…molten slag and recover metals. The roles of coke have been discussed in detail [17][18][19]. Sulfurizing agent was found to act as a collector phase to promote removal of the valuable metals from the slag, decrease the liquidus temperature of the final cobalt-containing product and provide sufficient volume of matte product to allow separation from slag [18].…”

Section: J Min Metall Sect B-metall 54 (1) B (2018) 73 -79mentioning

confidence: 99%

Reductive-sulfurizing smelting treatment of smelter slag for copper and cobalt recovery

Yang

Tang

et al. 2018

J min metall B Metall

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Recovery of copper and cobalt from smelter slag using reductive-sulfurizing smelting method was performed in this study. The effects of reductive agent (coke), sulfurizing agent (pyrite), slag modifier (CaO) and smelting temperature and duration on the extractive efficiencies of Cu, Co and Fe were discussed. The phase compositions and microstructure of the materials, copper-cobalt matte and cleaned slag were determined. The results showed that copper and cobalt contents in cleaned slag could decrease averagely to 0.18% and 0.071% respectively after cleaning. 91.99% Cu and 92.94% Co and less than 38.73% Fe were recovered from the smelter slag under the optimum conditions: 6 wt.% coke, 20 wt.% pyrite and 6 wt.% CaO addition to the smelter slag, smelting temperature of 1350°C and smelting duration of 3h. The addition of CaO can increase the selectivity of Co recovery. The cleaning products were characterized by XRD and SEM-EDS analysis. The results showed that the main phases of copper-cobalt matte were iron sulfide (FeS), geerite (Cu 8 S 5), iron cobalt sulfide (Fe 0.92 Co 0.08 S) and Fe-Cu-Co alloy. The cleaned slag mainly comprised fayalite (Fe 2 SiO 4), hedenbergite (CaFe(Si 2 O 6)) and magnetite (Fe 3 O 4).

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“…Silica, in spite of its low price, could be re-used in the smelting plant as flux, and to fix iron oxides in slag. Precious metals such as gold, silver and cobalt, ever in small quantities, have a market in the medium and/or small-size mining sector (Yucel et al, 1992;Derin et al, 2003). Thus, rather than disposing of the slag, it can be considered a new 'mining resource' for specific products.…”

Section: Introductionmentioning

confidence: 99%

Thermal decomposition of pyrometallurgical copper slag by oxidation in synthetic air

et al. 2010

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The purpose of this study was to investigate the possibility of separating pyrometallurgical copper (fayalite) slag by oxidation in a synthetic air atmosphere into ferrous and silicate phases suitable for resources to be recovered from them. Isothermal oxidation kinetics and the most probable reaction models are studied in the temperature range of 773 to 1173 K using thermogravimetric analysis data and the classical Johnson-Mehl-Avrami-Yerofeev-Kolmogorov (JMAYK) equation. Depending on the model applied, the activation energies of fayalite slag oxidation in the temperature range of 773-973 K were: D1: 37.55 kJ mol(-1); D2: 43.27 kJ mol(-1); D3: 50.52 kJ mol(-1); and D4: 45.65 kJ mol(-1). Depending on the model applied, the activation energies of fayalite slag oxidation in the temperature range of 1073-1173 K were: F1: 20.48 kJ mol(-1); R2: 20.45 kJ mol(-1); R3: 20.18 kJ mol(-1); A2: 21.54 kJ mol( -1) and A3: 22.34 kJ mol(-1). The transformation of fayalite to hematite and amorphous silica was completed after 1435, 1350 and 1080 s at temperatures of 1073, 1123 and 1173 K, respectively. The following oxidation products were identified by X-ray diffraction: (1) fayalite, hematite and magnesioferrite (Fe(2)MgO(4)) in the temperature range 773 to 973 K; and (2) hematite and magnesium iron oxide (Mg(1.55)Fe( 1.6)O(4)) in the temperature range of 1073 to 1173 K.

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Recovery of Cobalt from Copper Slags

Cited by 24 publications

References 0 publications

Battery Scrap and Biochar Utilization for Improved Metal Recoveries in Nickel Slag Cleaning Conditions

Battery Scrap and Biochar Utilization for Improved Metal Recoveries in Nickel Slag Cleaning Conditions

Reductive-sulfurizing smelting treatment of smelter slag for copper and cobalt recovery

Thermal decomposition of pyrometallurgical copper slag by oxidation in synthetic air

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