Alternative Reduction of Copper Matte in Reduction Process of Copper Slag

Zhang, Baojing; Niu, Leilei; Zhang, Ting‐an; Li, Zhiqiang; Zhang, Dongliang; Zheng, Chao

doi:10.2355/isijinternational.isijint-2016-631

Cited by 24 publications

(6 citation statements)

References 12 publications

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“…It suggests that gold remains in cyanide tailings can be captured and enriched in metallic iron if a high-temperature reduction process is conducted. The direct reduction-magnetic separation can effectively recover iron from converter slag [28], vanadium tailings [29], copper slag [30,31], and lead smelting slag [32] to produce iron powders. In this work, direct reduction roasting is applied to produce gold containing iron powders, namely Fe-rich Au-Fe alloy (Fe x Au 1−x ), from cyanide tailings.…”

Section: Introductionmentioning

confidence: 99%

Recovery of Gold and Iron from Cyanide Tailings with a Combined Direct Reduction Roasting and Leaching Process

Feng

et al. 2018

Metals

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Cyanide tailings are the hazardous waste discharged after gold cyanidation leaching. The recovery of gold and iron from cyanide tailings was investigated with a combined direct reduction roasting and leaching process. The effects of reduction temperature, coal dosage and CaO dosage on gold enrichment into Au-Fe alloy (FexAu1−x) were studied in direct reduction roasting. Gold containing iron powders, i.e., Au-Fe alloy, had the gold grade of 8.23 g/t with a recovery of 97.46%. After separating gold and iron in iron powders with sulfuric acid leaching, ferrous sulfate in the leachate was crystallized to prepare FeSO4·7H2O with a yield of 222.42% to cyanide tailings. Gold enriched in acid-leaching residue with gold grade of 216.58 g/t was extracted into pregnant solution. The total gold recovery of the whole process reached as high as 94.23%. The tailings generated in the magnetic separation of roasted products, with a yield of 51.33% to cyanide tailings, had no toxic cyanide any more. The gold enrichment behaviors indicated that higher reduction temperature and larger dosage of coal and CaO could promote the allocation of more gold in iron phase rather than in slag phase. The mechanism for enriching gold from cyanide tailings into iron phase was proposed. This work provided a novel route to simultaneously recover gold and iron from cyanide tailings.

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Section: Introductionmentioning

confidence: 99%

Recovery of Gold and Iron from Cyanide Tailings with a Combined Direct Reduction Roasting and Leaching Process

Feng

et al. 2018

Metals

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“…To recover the valuable metals from CS, various processes have been proposed, which can be summarized as pyrometallurgical, hydrometallurgical, and combined techniques (Jadhav and Hocheng, 2012). In the pyrometallurgy field, a typical treatment for these slags is reduction smelting (Gonzalez et al, 2005;Zhang, B.-j. et al, 2017;Zhou et al, 2019;).…”

Section: J O U R N a L P R E -P R O O Fmentioning

confidence: 99%

A potential industrial waste–waste co-treatment process of utilizing waste SO2 gas and residue heat to recover Co, Ni, and Cu from copper smelting slag

Wan

Taskinen

Shi

et al. 2021

Journal of Hazardous Materials

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“…Our research group proposed a new craft for the preparation of Cu–Fe alloy by reducing copper slag [ 1 , 2 ]. Copper and iron can be used as raw materials to make copper-containing steel or copper-containing cast iron, and copper and iron in slag are comprehensively utilized [ 17 , 18 ]. In the copper smelting process, copper slag is produced in the process of preparing matte.…”

Section: Introductionmentioning

confidence: 99%

Desulfurization of Cu–Fe Alloy Obtained from Copper Slag and the Effect on Form of Copper in Alloy

Zhang

Feng²,

Zhang³

2022

Materials

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In order to realize the high-value utilization of copper slag, a process for preparing Cu–Fe alloy through the reduction of copper slag is proposed. The sulfur in the alloy exists in the form of matte inclusions, which is different from sulfur in molten iron. The reaction of CaO with Cu2S is difficult. It is necessary to add a reducing agent to promote desulfurization. To avoid the introduction of other elements, Fe‒Mn and CaC2 additions were used as desulfurizers for the desulfurization of Cu‒Fe alloy. The thermodynamics of the desulfurization reaction were calculated and the experimental process was studied. It was found that the Gibbs free energy of desulfurization reactions was negative for Fe‒Mn and that CaC2 can reduce the sulfur in the alloy to 0.0013% and 0.0079%, respectively. The desulfurization process affected the shape of copper in the alloy. Part of copper in this alloy exists in the form of nano-copper spheres, and the size of the spheres is found to increase after desulfurization. Reducing agents can facilitate the desulfurization process of stable sulfides.

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Alternative Reduction of Copper Matte in Reduction Process of Copper Slag

Cited by 24 publications

References 12 publications

Recovery of Gold and Iron from Cyanide Tailings with a Combined Direct Reduction Roasting and Leaching Process

Recovery of Gold and Iron from Cyanide Tailings with a Combined Direct Reduction Roasting and Leaching Process

A potential industrial waste–waste co-treatment process of utilizing waste SO2 gas and residue heat to recover Co, Ni, and Cu from copper smelting slag

Desulfurization of Cu–Fe Alloy Obtained from Copper Slag and the Effect on Form of Copper in Alloy

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