Iron and copper recovery from copper slags through smelting with waste cathode carbon from aluminium electrolysis

Mao, Kai-xuan; Li, Lei; Xu, Miao

doi:10.1007/s11771-021-4749-z

Cited by 14 publications

(3 citation statements)

References 30 publications

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“…Thus, the following optimal ore leaching conditions were established: sulfuric acid concentration 50-75 g/l. Under these conditions, the degree of extraction of copper oxides into the solution is 98-99% [7].…”

Section: Resultsmentioning

confidence: 99%

Extraction of copper from copper processing plant waste by leaching

Mirzajanova,

Saidova,

Beknazarova

et al. 2024

E3S Web of Conf.

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On the territory of Uzbekistan, copper is mainly found in chalcopyrite’s and chalcocite’s, the enrichment of copper minerals results in waste and tailings as a result of technological processing. The processes of copper processing plants are complex and are constantly characterized by gradual technological processes. The technology of ore enrichment in its initial state can be enriched in several stages: grinding and crushing, flotation processes, gravitational methods, magnetic separation methods. As a result of technological processes, waste and tailings are formed, i.e. they are very poor and unsuitable for the recycling process. And these wastes harm the environment, accumulate and occupy large areas. An effective technology for extracting metals from waste is the process of leaching in the dump, and the ratio of leaching of sulfuric acid with tailings corresponds according to the technological scheme, that is, T : W = 1 : 15; 1 : 10; 1 : 7,5. The tail analysis was studied, which has a copper content of 0.534%, conducted by experiment after leaching, the amount of copper in the solution formed 1.66%. The copper in the solution turned into a solution 3 times more than in its original form.

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Section: Resultsmentioning

confidence: 99%

Extraction of copper from copper processing plant waste by leaching

Mirzajanova,

Saidova,

Beknazarova

et al. 2024

E3S Web of Conf.

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“…High-grade iron ore resources are decreasing [2]. Accordingly, many researchers are focused on the use of secondary sources of iron [3,4].…”

Section: Introductionmentioning

confidence: 99%

Effect and Mechanism of CaO on Iron Recovery and Desulfurization by Reduction Roasting-Magnetic Separation of High-Sulfur Cyanide Tailings

Jin-zhi

Liu³

et al. 2022

Minerals

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The increasing demand for iron ore in the world causes the continuous exhaustion of mineral resources. The utilization of iron in secondary resources has become of focus. The present study was carried out to recover iron from high-sulfur cyanide tailings by coal-based reduction roasting-magnetic separation. The mechanism of CaO to increase iron recovery and reduce sulfur was investigated by observing CO and CO2 gas composition produced by the reaction, mineral composition and microstructure, distribution characteristics of sulfur, and the intercalation relationship between iron particles and gangue minerals. The results showed that the addition of CaO could increase the gasification rate of the reducing agent, increase the amount of CO2 gas produced, promote the reduction of iron minerals, and improve the metallization degree of iron. When CaO was not added, sulfur was mainly transformed into troilite, which was closely connected with iron particles and was difficult to remove by grinding and magnetic separation. With the addition of CaO, CaO preferentially formed oldhamite with active sulfur, which reduced the formation of troilite. Oldhamite was basically distributed in an independent gangue structure. There was a clear boundary between iron particles and gangue minerals. Oldhamite could be removed by grinding-magnetic separation.

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“…To synergistically reutilize the carbon and fluoride components, the spent cathode carbon was used as a reductant in a dilution process of copper converter slags or smelting slags for recovering Cu and/or Co [22][23][24]. During these processes, the increase of spent cathode carbon both increased the metal recovery and the fluorides solidification efficiency in the final slag [25], and simultaneously the cyanides were transformed to N2 and CO2. The leachable Fand CNcontents in the final slag were less than 5 mg/L and 0.1 mg/L respectively.…”

Section: Introductionmentioning

confidence: 99%

Immobilization of fluorides from spent carbon cathode in a copper smelting slag

Tian

2022

J min metall B Metall

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The fluorides from spent carbon cathodes could be effectively solidified in a molten copper smelting slag (FeO-Fe3O4-SiO2-CaO-Al2O3) in forms of CaF2 and Ca4Si2F2O7. The results of thermodynamic analysis, chemical analysis, and XRD and EPMA analyses showed that the F solidification efficiency increased with the CaO amount and decreased with the addition of Al2O3 and SiO2. In addition, it was noteworthy that the F solidification efficiency decreased with an excessive CaO amount, which could be ascribed to the consumption of SiO2 through forming CaSiO3 and Ca3Si2O7. It restricted the solidification of the fluoride into Ca4Si2F2O7. Under the conditions of melting temperature of 1300?C, residence time of 60 min and N2 flow rate of 40 ml/min, the optimum CaO and NaF amounts were found to be 20 wt.% and 6 wt.% respectively, in which the F solidification efficiency in the copper smelting slag of FeO-Fe3O4-SiO2-CaO-Al2O3 obtained 98.35%.

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Iron and copper recovery from copper slags through smelting with waste cathode carbon from aluminium electrolysis

Cited by 14 publications

References 30 publications

Extraction of copper from copper processing plant waste by leaching

Extraction of copper from copper processing plant waste by leaching

Effect and Mechanism of CaO on Iron Recovery and Desulfurization by Reduction Roasting-Magnetic Separation of High-Sulfur Cyanide Tailings

Immobilization of fluorides from spent carbon cathode in a copper smelting slag

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