The Phase Transition and Element Distribution of Copper Smelting Slag in the Cooling—Sulfidation Process

Cao, Shuheng; Liu, Zhihong; Xing-wu, LU; Zhang, Leru; Li, Qihou; Xia, Longgong

doi:10.1007/s11663-023-02740-5

Cited by 4 publications

(1 citation statement)

References 37 publications

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“…The matte quantities are given in Table 3. Since the metal coalescence and the formation of a matte are based on elemental diffusion, sufficient time and temperature should be provided [26]. However, gravity is the main driving force for elemental diffusion, allowing elements with a higher density to sink to the bottom of the containing vessel, which otherwise would remain in the slag [27].…”

Section: Recoveriesmentioning

confidence: 99%

Feasibility of Recovering Valuable and Toxic Metals from Copper Slag Using Iron-Containing Additives

Mitrašinović,

Yuankun,

Stopic

et al. 2023

Metals

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One of the greatest environmental challenges in metal extraction is the generation of a large amount of slag. Most of these slags contain insufficient amounts of valuable metals for economical revalorization, but these concentrations may be harmful for the environment. At present, more than 80% of the global copper products are obtained by the smelting process, where the major by-products are various slags containing a broad range of almost all known elements. In this study, valuable and potentially harmful elements were recovered from mining waste using gravity separation and gravity settling. The settling process was enhanced by injecting coke, ferrocarbon, ferrosilicon, and ferrosulfide. In total, 35 elements were detected in the samples using electron probe microanalysis. After the treatment, 89.4% of the valuable, toxic, and trace elements gathered in the newly formed matte after maintaining the copper slag for four hours at 1300 °C and adding ferrosilicon. The metallic constituents of slags could be an important source of raw materials and they could be considered an environmentally beneficial source of copper and other materials. Suggested practices can prevent harmful elements from entering the environment, generate value from the gathered metals, and make the remaining slag suitable for construction or mine backfill materials. The present article also assesses the challenges in slag processing by the pyrometallurgical route and provides a roadmap for further investigations and large-scale studies.

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Section: Recoveriesmentioning

confidence: 99%

Feasibility of Recovering Valuable and Toxic Metals from Copper Slag Using Iron-Containing Additives

Mitrašinović,

Yuankun,

Stopic

et al. 2023

Metals

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Removal of the heavy metals from copper slag by using carbonless additives

Mitrašinović,

Stopic,

2024

Waste Management

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Structural Changes in Copper Slags During Slow Cooling

Sukurov,

Kvyatkovskiy,

Kozhakhmetov

et al. 2024

Metals

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The objects of the study were converter slags from the Balkhash copper plant in their initial state and after heat treatment. Using mineralogical and X-ray phase analysis, scanning electron microscopy (SEM), and electron probe microanalysis (EPMA), it was found that the initial converter slag and its thermally treated samples have identical matrices with almost complete coincidence in mineral and phase compositions. The distinguishing feature is the quantitative ratio of mineral components in the slag mass. Almost all of the iron is oxidized and present in the form of fayalite, magnetite, and magnetite, with other elements (silicon, copper, zinc, and aluminum) incorporated into its lattice. The structure of all slag samples indicates an association of sulfur exclusively with copper. Copper in the slags was identified in both metallic and sulfide forms. Slow cooling of the converter slag after its remelting contributes to the reduction in the sulfide–metal suspension in the volume of the melt and its coarsening. During slow cooling, structural changes occur not only in the main oxide part of the slag but also in the polymetallic globules.

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The Phase Transition and Element Distribution of Copper Smelting Slag in the Cooling—Sulfidation Process

Cited by 4 publications

References 37 publications

Feasibility of Recovering Valuable and Toxic Metals from Copper Slag Using Iron-Containing Additives

Feasibility of Recovering Valuable and Toxic Metals from Copper Slag Using Iron-Containing Additives

Removal of the heavy metals from copper slag by using carbonless additives

Structural Changes in Copper Slags During Slow Cooling

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