Comprehensive recoveries of selenium, copper, gold, silver and lead from a copper anode slime with a clean and economical hydrometallurgical process

Dong, Zhonglin; Jiang, Tao; Xu, Bin; Yang, Junkui; Chen, Yanzhu; Li, Qian; Yang, Yongbin

doi:10.1016/j.cej.2020.124762

Cited by 78 publications

(15 citation statements)

References 39 publications

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“…Since the tailings before the leaching reaction were dense and poreless (Figure S2), the reaction interface could gradually contract toward the cores after the acetic acid molecules reacted with the particles. To better understand the leaching dynamics, the leaching kinetic data were fitted to a shrinking nucleus model (SI section 1.3), which is commonly applied for the heterogeneous reaction, − as illustrated in Figures S11. The sound linear relationship ( R 2 > 0.99, Table S8) fitted with the empirical model of surface chemical control (eq S1), indicating that the Ce leaching may follow the shrinking nucleus model of chemically control.…”

Section: Resultsmentioning

confidence: 99%

Selective Leaching of Rare Earth Elements from Ion-Adsorption Rare Earth Tailings: A Synergy between CeO₂ Reduction and Fe/Mn Stabilization

Zhou

Xiao

Guo

et al. 2021

Environ. Sci. Technol.

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The increasing demand for rare earth elements (REEs) motivates the development of novel strategies for cost-effective REE recovery from secondary sources, especially rare earth tailings. The biggest challenges in recovering REEs from ion-adsorption rare earth tailings are incomplete extraction of cerium (Ce) and the coleaching of iron (Fe) and manganese (Mn). Here, a synergistic process between reduction and stabilization was proposed by innovatively using elemental sulfur (S) as reductant for converting insoluble CeO 2 into soluble Ce 2 (SO 4 ) 3 and transforming Fe and Mn oxides into inert FeFe 2 O 4 and MnFe 2 O 4 spinel minerals. After the calcination at 400 °C, 97.0% of Ce can be dissolved using a diluted sulfuric acid, along with only 3.67% of Fe and 23.3% of Mn leached out. Thermodynamic analysis reveals that CeO 2 was indirectly reduced by the intermediates MnSO 4 and FeS in the system. Density functional theory calculations indicated that Fe(II) and Mn(II) shared similar outer electron arrangements and coordination environments, favoring Mn(II) over Ce(III) as a replacement for Fe(II) in the FeO 6 octahedral structure of FeFe 2 O 4 . Further investigation on the leaching process suggested that 0.5 mol L −1 H 2 SO 4 is sufficient for the recovery of REEs (97.0%). This research provides a promising strategy to selectively recover REEs from mining tailings or secondary sources via controlling the mineral phase transformation.

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Section: Resultsmentioning

confidence: 99%

Selective Leaching of Rare Earth Elements from Ion-Adsorption Rare Earth Tailings: A Synergy between CeO₂ Reduction and Fe/Mn Stabilization

Zhou

Xiao

Guo

et al. 2021

Environ. Sci. Technol.

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“…As can be seen, the leaching of Se, Te and Ag increased significantly by increasing H2SO4 from 0.5 to 2.0 M; at 2.0 M H2SO4, the leaching percentages of the metals are 80.7%, 68.6% and 76.8%, respectively. At still higher H2SO4 concentration, the leaching trends of Se and Te could show marginal improvements, but that of Ag decreased, which is attributed to the formation of Ag2S [6][7][8] to limit the leaching of Ag-related phases [3][4][5]. Therefore, further leaching experiments were performed using 2.0 M H2SO4.…”

Section: Effect Of H2so4 Concentrationmentioning

confidence: 99%

“…The kinetics of leaching reactions of Se, Te and Ag is described by the shrinking core model, wherein the reaction involves the reaction between solid particles and the fluid extractants. Two common equations of shrinking core model, such as diffusion through a product layer (Equation (1)) and surface chemical reaction (Equation ( 2)) [3,13,14], and an empirical mixed kinetic model (Equation ( 3)) [15] were used to study the kinetics of leaching reactions.…”

Section: Kinetic Studymentioning

confidence: 99%

“…HNO3 was used as the oxidant for the leaching of Se from de-copperized CAS, which achieved 97.8% of Se recovery [2]; however, the process faces the issue of the release of harmful NOx gas, which required a complicated sealed-leaching system. H2O2 is a less toxic oxidant, but its stability is sensitive to the higher temperature (it starts to decompose at temperature ≥70 °C) and is unrecyclable as well [3][4][5]. MnO2 provides low environmental impact, high metal recovery, and recyclability; according to Xiao et al [4], sulfuric acid leaching with MnO2 can ensure a profit of $82 per 1 t of CAS treated.…”

Section: Introductionmentioning

confidence: 99%

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Leaching Kinetics of Selenium, Tellurium and Silver from Copper Anode Slime by Sulfuric Acid Leaching in the Presence of Manganese(IV) Oxide and Graphite

Kurniawan

Lee

Kim

et al. 2021

The 1st International Electronic Conference on Metallurgy and Metals

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Sulfuric acid leaching of copper anode slime (CAS) in the presence of manganese(IV) oxide (MnO2) and graphite was investigated for Se, Te and Ag recovery. The study reveals that the leaching of Se, Te and Ag was facilitated by the galvanic interaction with MnO2, and graphite played the role of a catalyst. The leaching process could yield 81.9% Se, 90.8% Te, and 80.7% Ag leaching efficiency when the conditions were maintained as 500 rpm, 2.0 M H2SO4, 0.8/0.8/1 MnO2/graphite/CAS, and 90 °C temperature. The kinetic study showed that Se leaching followed the surface chemical reaction at all the tested temperature range (25–90 °C) with the activation energy of 27.7 kJ/mol. Te and Ag leaching at temperature 25–50 °C followed the mixed and surface chemical reaction models, respectively, and changed to fit the diffusion and mixed control models, respectively, in the temperature range 60–90 °C with the corresponding activation energy of 17.8 and 12.2 kJ/mol.

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“…Zinc is currently the fourth most widely consumed metal in the world after iron, aluminum, and copper, and it has been widely used in automobile, machinery, battery, alloy, construction, shipping, and other industries [1,2]. Sphalerite (zinc sulfide, ZnS) is the primary mineral from which most of the world's zinc is produced [3].…”

Section: Introductionmentioning

confidence: 99%

Selective Flotation of Elemental Sulfur from Pressure Acid Leaching Residue of Zinc Sulfide

Liu

Jiang

Zhang³

et al. 2021

Minerals

Self Cite

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An efficient flotation process was developed to selectively recover elemental sulfur from a high-sulfur pressure acid leaching residue of zinc sulfide concentrate. The process mineralogy analysis showed that the sulfur content reached 46.21%, and 81.97% of the sulfur existed as elemental sulfur which was the major mineral in the residue and primarily existed as pellet aggregate and biconical euhedral crystal. An elemental sulfur concentrate product with 99.9% of recovery and 83.46% of purity was obtained using the flotation process of one-time blank rougher, two-time agent-added roughers, and two-time cleaners with Z-200 as collector and Na2S + ZnSO4 + Na2SO3 as depressant. The flotation experiment using return water indicated that the cycle use of return water had no adverse effect on the flotation performance of elemental sulfur. The process mineralogy analysis manifested that main minerals in the residue directionally went into the flotation products. Most of elemental sulfur entered the concentrate while other minerals almost completely went into the tailing. Main valuable elements lead, zinc, and silver entered the tailing with sulfides and could be recovered by lead smelting. The proposed process can realize the comprehensive recovery of valuable components in the high-sulfur residue and thus it has wide industrial application prospect.

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Comprehensive recoveries of selenium, copper, gold, silver and lead from a copper anode slime with a clean and economical hydrometallurgical process

Cited by 78 publications

References 39 publications

Selective Leaching of Rare Earth Elements from Ion-Adsorption Rare Earth Tailings: A Synergy between CeO₂ Reduction and Fe/Mn Stabilization

Selective Leaching of Rare Earth Elements from Ion-Adsorption Rare Earth Tailings: A Synergy between CeO₂ Reduction and Fe/Mn Stabilization

Leaching Kinetics of Selenium, Tellurium and Silver from Copper Anode Slime by Sulfuric Acid Leaching in the Presence of Manganese(IV) Oxide and Graphite

Selective Flotation of Elemental Sulfur from Pressure Acid Leaching Residue of Zinc Sulfide

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Comprehensive recoveries of selenium, copper, gold, silver and lead from a copper anode slime with a clean and economical hydrometallurgical process

Cited by 78 publications

References 39 publications

Selective Leaching of Rare Earth Elements from Ion-Adsorption Rare Earth Tailings: A Synergy between CeO2 Reduction and Fe/Mn Stabilization

Selective Leaching of Rare Earth Elements from Ion-Adsorption Rare Earth Tailings: A Synergy between CeO2 Reduction and Fe/Mn Stabilization

Leaching Kinetics of Selenium, Tellurium and Silver from Copper Anode Slime by Sulfuric Acid Leaching in the Presence of Manganese(IV) Oxide and Graphite

Selective Flotation of Elemental Sulfur from Pressure Acid Leaching Residue of Zinc Sulfide

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Selective Leaching of Rare Earth Elements from Ion-Adsorption Rare Earth Tailings: A Synergy between CeO₂ Reduction and Fe/Mn Stabilization

Selective Leaching of Rare Earth Elements from Ion-Adsorption Rare Earth Tailings: A Synergy between CeO₂ Reduction and Fe/Mn Stabilization