A Study on the Selective Leaching of Valuable Metals and the Configuration of Iron Silicon Phases in Copper Smelting Slag by Oxidative Pressure Leaching

Liao, Yalong; Ji, Guangxiong; Shi, Gongchu; Xi, Jiajun

doi:10.1007/s40831-021-00404-9

Cited by 12 publications

(5 citation statements)

References 25 publications

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“…At 220 °C, the extraction efficiencies of cobalt, copper, and zinc reached 96.4, 93.3, and 92.2% in the first 60 min, respectively. Similar findings were reported by Liao et al 73 They stated that when the temperature increased from 140 to 200 °C, under a H 2 SO 4 concentration of 0.4 mol/L, S / L ratio of 1:6, and 0.6 MPa, the leaching efficiency of Cu increased from 58.3 to 95.1% for the leaching of copper smelting slag. As shown in Figure 6 d, the total iron extraction was 1.3% at 180 °C, 1.1% at 200 °C, 0.6% at 220 °C, and 0.5% at 240 °C after 2 h. Changing the leaching temperature under oxidative conditions and a certain S / L ratio had no significant effect on iron dissolution.…”

Section: Resultssupporting

confidence: 88%

Pressure Leaching of Copper Slag Flotation Tailings in Oxygenated Sulfuric Acid Media

Seyrankaya

2022

ACS Omega

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In this study, a hydrometallurgical method for the recovery of copper, cobalt, and zinc from copper slag flotation tailings (SFT) was investigated. SFT contains large amounts of valuable metallic compounds, such as copper, cobalt, and zinc. A representative SFT sample containing 0.50% Cu, 0.148% Co, 3.93% Zn, and 39.50% Fe was used in experimental studies. High-pressure oxidative acid leaching of SFT was carried out to assess the effects of sulfuric acid concentration, oxygen partial pressure, reaction time, solid/liquid ratio, and temperature on the extraction of copper, cobalt, zinc, and iron. The dissolution of metals from the SFT sample increased with temperature and sulfuric acid concentration. However, high acid concentrations and high solid/liquid (S/L) ratios led to gel formation that caused filtration problems and inhibited metal dissolution. The optimum leaching conditions were found to be a leaching time of 90 min, an acid concentration of 250 kg/t, a temperature of 220 °C, an S/L ratio of 1:5, and an oxygen partial pressure of 0.7 MPa. Under these conditions, 93.1 ± 1.1% Cu, 96.3 ± 1.8% Co, and 92.3 ± 1.7% Zn were extracted. Iron dissolution was only 0.5 ± 0.1%. This hydrometallurgical process almost completely recovers valuable metals. In particular, cobalt, which is of great importance in the production of lithium-ion batteries, has been declared a critical metal by the United States, Canada, and the EU and was taken into solution with very high extraction efficiency (>95%). Additionally, oxygen partial pressure enhanced copper, cobalt, and zinc dissolution. When O2 was not introduced into the leaching system, the extraction efficiencies of Co, Cu, and Zn were approximately 24.5, 5.3, and 26.3%, respectively, after 2 h of leaching treatment.

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Section: Resultssupporting

confidence: 88%

Pressure Leaching of Copper Slag Flotation Tailings in Oxygenated Sulfuric Acid Media

Seyrankaya

2022

ACS Omega

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“…On the other hand, the leaching rate of copper was lower than that of Ni and Co and reached a high of 89.42% after 1.5 h, and no further improvements in dissolution were noted. The lower leaching efficiency of copper is likely due to the re-precipitation of the dissolved copper, which has been previously noted [21]. The Fe tenors to the PLS remained around 10% after 1 h of leaching time.…”

Section: Effect Of Leaching Timesupporting

confidence: 56%

“…McDonald and Muir [28] and Han et al [29] also observed that upon increasing the acid and sulfate concentrations, the predominant iron-containing residue formed as jarosite. The silica phase was not detected by XRD; however, XRF analysis (Table 3) indicates almost 90% silica removal in all the solid residues, and this suggests that silica may exist as amorphous silica, rather than in a crystalline form, which has also been confirmed by other studies [11,21]. During the HPAL of slag, the following chemical Reactions ( 1)-( 6) are considered [4,20,[30][31][32].…”

Section: Effect Of Sulfuric Acid Concentrationsupporting

confidence: 54%

“…Iron tenors in the PLS remained low at about 2%; however, the extent of Fe reporting to the PLS seems to significantly increase above 0.4 mol/L H 2 SO 4 concentration. Liao et al noted the possible re-dissolution of hematite from the solid residue, thus increasing the iron concentration in the PLS at high acid concentrations [21]. At 0.6 mol/L H 2 SO 4 concentration, almost all the Co is extracted from the slag, while the Cu and Ni extractions began to decline.…”

Section: Effect Of Sulfuric Acid Concentrationmentioning

confidence: 99%

“…Therefore, the addition of lixiviants such as dichromate compounds or hydrogen peroxide during leaching has largely been studied to address these challenges [15][16][17][18][19]. The high-pressure acid leaching (HPAL) process has been noted to be a robust process in achieving exceptionally high metal extractions and producing a benign residue that is most suitable for safe disposal [5,11,20,21]. However, low metal extractions have consistently been reported during the high-pressure leaching of amorphous slags when compared to crystalline (naturally cooled) slags with HPAL conditions of around 250 • C and oxygen overpressure of about 0.6 MPa [4,10,19].…”

Section: Introductionmentioning

confidence: 99%

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Establishment of a Hydrometallurgical Scheme for the Recovery of Copper, Nickel, and Cobalt from Smelter Slag and Its Economic Evaluation

et al. 2023

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In pursuit of carbon neutrality, the demand for metals that are necessary for the development of clean energy technologies is rapidly increasing. Metallurgical waste, such as slag, presents a promising secondary source of these key metals. This research aims to develop an eco-friendly hydrometallurgical process to recover Cu, Ni, and Co from discarded copper/nickel slag. High-pressure acid leaching (HPAL) was used to selectively leach Ni, Cu, and Co from the fayalite slag, yielding high leaching efficiencies of 99.9%, 89.4%, and 99.9%, respectively, with low Fe and Si tenors to the pregnant leach solution (PLS). The solvent extraction (SX) technique utilizing LIX 984N was used to selectively extract and enrich copper from the dilute PLS to about 23 g/L Cu with a very low Fe concentration of 0.05 g/L. Potassium amyl xanthate (PAX) solution was used to form Ni and Co xanthate complexes from the raffinate solution. Nickel was selectively recovered using ammonia solution, while the cobalt xanthate complex was thermally decomposed and recovered as cobalt oxide solids of about 25 wt.% Co. A comprehensive process flowsheet is presented. Furthermore, to realize the real application of the developed slag cleaning process, a preliminary economic evaluation was performed.

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A novel approach for recovery of iron from copper slag using calcium salts

Bhatti,

Qiao

2024

Environ Sci Pollut Res

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A Study on the Selective Leaching of Valuable Metals and the Configuration of Iron Silicon Phases in Copper Smelting Slag by Oxidative Pressure Leaching

Cited by 12 publications

References 25 publications

Pressure Leaching of Copper Slag Flotation Tailings in Oxygenated Sulfuric Acid Media

Pressure Leaching of Copper Slag Flotation Tailings in Oxygenated Sulfuric Acid Media

Establishment of a Hydrometallurgical Scheme for the Recovery of Copper, Nickel, and Cobalt from Smelter Slag and Its Economic Evaluation

A novel approach for recovery of iron from copper slag using calcium salts

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