Separating and Recycling of Fe, Cu, Zn from Dumped Copper  Slag by Microwave Irradiation Assisted Carbothermic Method

Liao, Yalong; Zhou, Juan; Huang, Feirong

doi:10.12783/issn.1544-8053/13/s1/22

Cited by 8 publications

(3 citation statements)

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“…The processing technologies differ depending on the metals to be recovered from copper slag. Hydrometallurgical treatment is widely used for the recovery of copper slag, including direct leaching in sulfuric acid, and leaching in sulfuric acid through H 2 S gas or ferric chloride [10,11]. However, leaching of copper slag may be too expensive because it requires milling costs for leaching, and high consumption of strong acid and reagents.…”

Section: Introductionmentioning

confidence: 99%

A Study on Reduction of Copper Smelting Slag by Carbon for Recycling into Metal Values and Cement Raw Material

Wang

Erdenebold

2020

Sustainability

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Copper smelting slag is a solution of molten oxides created during the copper smelting and refining process, and about 1.5 million tons of copper slag are generated annually in Korea. The oxides in copper smelting slag include ferrous (FeO), ferric oxide (Fe2O3), silica (SiO2 from flux), alumina (AI2O3), calcia (CaO) and magnesia (MgO). The main oxides in copper slag, which are iron oxide and silica, exist in the form of fayalite (2FeO·SiO2). Since copper smelting slag contains high content of iron, and copper and zinc, common applications of copper smelting slag can be used in value-added products such as abrasive tools, roofing granules, road-base construction, railroad ballast, fine aggregate in concrete, etc. Some studies have attempted to recover metal values from copper slag. This research was intended to recover ferrous alloy contained Cu, a raw material of zinc, from copper slag, and produce reformed slag such as blast furnace slag for Portland cement. As a result, it was confirmed that with reduction smelting by carbon at temperatures above 1400 °C, it is possible to recover pig iron containing copper from copper smelting slag, and the addition of CaO in reduction smelting helped to reduce iron oxide in the fayalite and change the chemical and mineralogical composition of the slag. The copper oxide in the slag can be easily reduced and dissolved in the molten pig iron, and zinc oxide is also reduced to a volatile zinc, which is removed from the furnace as fumes, by carbon during the reduction process. When CaO addition is above 5%, acid slag is completely transformed into calcium silicate slag and is observed to be like blast furnace slag.

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Section: Introductionmentioning

confidence: 99%

A Study on Reduction of Copper Smelting Slag by Carbon for Recycling into Metal Values and Cement Raw Material

Wang

Erdenebold

2020

Sustainability

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“…Copper slags have been used as abrasives (polishing and cleaning) for metallic structures [15,16] and mainly in the building industry: concrete manufactured with copper slag [5]; copper slags as fine particles in concrete manufacturing [13]; copper slag as a replacement for the sand in cements [9]; copper slag as a filler in glass-epoxy composites [17]; and copper slag as a construction material in bituminous pavements [18]. Research has also focused on the recovery of iron from the slag: by using coke as reductant of the copper oxide and the magnetite [19]; by modifying the molten slag with the purpose of promoting the mineralization of recoverable mineral phases and inducing the growth of the mineral phases [20]; by using a method based on coal, Direct Reduction Iron (DRI), and magnetic separation [21]; by means of a process based on aluminothermic reduction [22]; by reduction in an electric furnace with the objective of obtaining a Cu-Pb-Fe alloy [23]; by carbothermic reduction to transform the copper slag into pig iron and glassy material [24]; by irradiation with a microwave as a support of the carbothermal method [25]; or by reduction with coke powders and magnetic separation [26].…”

Section: Introductionmentioning

confidence: 99%

Recovery of Copper and Magnetite from Copper Slag Using Concentrated Solar Power (CSP)

González

Prażuch

Ruiz-Bustinza

et al. 2021

Metals

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On the one hand, copper slag is nowadays a waste in copper pyrometallurgy despite the significant quantities of iron (>40 wt. %) and copper (1 to 2 wt. %). On the other hand, solar energy, when properly concentrated, offers great potential in high-temperature processes. Therefore, concentrated solar power (CSP) could be used in the treatment of copper slag to transform fayalite into magnetite and copper sulfides and oxides into copper nodules. This is the objective of this paper. The results show that fayalite was partially decomposed into magnetite and silica. Moreover, copper nodules (65–85 wt. % Cu) were identified in the treated samples, while the initial slag, analyzed by X-ray diffraction, X-ray fluorescence, and SEM-EDX, did not show the presence of metallic copper. Finally, the treated copper slag was crushed and grinded down to 40 μm, and two fractions were obtained by magnetic separation. The magnetic fraction (85%) was mainly comprised of magnetite, while the non-magnetic fraction (15%) had 5–10 wt. % Cu. Considering the experimental results, 7.5–18 kg Cu/t slag might be recovered from the slag. A preliminary economic analysis, considering the current copper price, indicates that only the recovery of copper could represent a significant economic benefit (>30 €/t slag). Therefore, CSP might be a potential candidate for the treatment of copper slag to recover copper and iron.

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“…In the cement industry, it is used as a raw material for cement clinker, cement concrete mixed material, and used as an iron correction agent to produce Portland cement clinker (Shi et al, 2008;Feng et al, 2019;Wang et al, 2020) In the construction industry, it is used in brick making and various cutting blocks and is an alternative to sand for concrete preparation (Kalusuraman et al, 2019;Lan et al, 2020). At home and abroad, research on the recovery of single metal copper from copper slag has been more in-depth and has achieved fruitful results (Zhang et al, 2015;Heo et al, 2016;Liao et al, 2016;Guo et al, 2017;Li et al, 2017). In summary, the current technology mainly includes pyrometallurgy, mineral processing, and the wet method.…”

Section: Introductionmentioning

confidence: 99%

Element Distribution and Migration Behavior in the Copper Slag Reduction and Separation Process

et al. 2021

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Copper slag is a solid pollutant with high recyclability. Reduction and separation are regarded as effective disposal methods. However, during the melting process, the separation and migration behavior of elements in the copper slag is complicated. Thus, the formation of pollutants cannot be controlled merely by optimizing the operation parameters. The elemental distribution and migration behavior are discussed in this work. In reduction experiments, the copper slag smelting liquid was divided into three layers: a reduction slag layer, a reactive boundary layer, and an iron ingot layer. Reduction slag and ingot iron were on the top and bottom of the liquid, respectively. Residual carbon oozed at the interface. C can react with reducible “O” atoms, which exist in 2FeO·SiO2, Fe3O4, and CuO. Meanwhile, CO was generated and overflowed from the liquid layer. After reduction by C or CO, metallic iron and copper were produced and migrated to the iron ingot layer. In the liquid, S gradually diffused into the upper layer. Some of the ZnO and CuS spilled from the liquid into the flume. After reduction, CaO·SiO2 was generated and moved to the upper layer.

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Separating and Recycling of Fe, Cu, Zn from Dumped Copper Slag by Microwave Irradiation Assisted Carbothermic Method

Cited by 8 publications

References 0 publications

A Study on Reduction of Copper Smelting Slag by Carbon for Recycling into Metal Values and Cement Raw Material

A Study on Reduction of Copper Smelting Slag by Carbon for Recycling into Metal Values and Cement Raw Material

Recovery of Copper and Magnetite from Copper Slag Using Concentrated Solar Power (CSP)

Element Distribution and Migration Behavior in the Copper Slag Reduction and Separation Process

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