Composition Modification of ZnO Containing Fayalite Slag from Secondary Source Copper Smelting

Shi, Huayue; Chen, Liugang; Jones, Tom Peter; Blanpain, Bart; Guo, Muxing

doi:10.1007/978-3-319-48093-0_72

Cited by 2 publications

(4 citation statements)

References 6 publications

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“…Industrial slags are used for experiments at Fe saturation (low pO 2 ) and 1423 K. Micrographs of the industrial slag show fayalite, spinel (<10 µm) and tridymite phases within the amorphous slag matrix. The same microstructure is observed in [55] with spinel being a minor part of solids in slag and fayalite being the major precipitate.…”

Section: Spinels In Different Slag Systemssupporting

confidence: 78%

“…For the given conditions the liquid area of the slag system is shifted to lower FeO:SiO 2 ratios with increasing Al 2 O 3 concentration. A similar slag system under different conditions is investigated by Shi et al [54,55]. Industrial slags are used for experiments at Fe saturation (low pO 2 ) and 1423 K. Micrographs of the industrial slag show fayalite, spinel ( < 10 μm) and tridymite phases within the amorphous slag matrix.…”

Section: Slags In Cu Metallurgymentioning

confidence: 99%

“…Al 2 O 3 and ZnO dissolution in the liquid iron silicate slag matrix are important drivers for spinel formation. For example in [55] it is described that Al 2 O 3 solubility in liquid decreases with increasing ZnO content in the slag. Additionally, temperature and atmosphere are relevant parameters.…”

Section: Slags In Cu Metallurgymentioning

confidence: 99%

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Review on operation of spinel-containing slags of the non-ferrous metallurgy

Kleeberg

2022

Materials Science and Technology

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Operation of slags and their valorisation are one major topic in the metallurgical industry. Different phases within the slag have influences on the slag properties, which requires fundamental knowledge on the system to consider effective measures to reach the individual optimisation targets. Solid phases like spinels in slags have an impact on viscosity, resulting in operational issues, increased metal losses and other effects in daily operation. In this document an overview on spinel-containing slags of the non-ferrous metallurgical processes is given, with focus on operation in liquid state. It shows a summary of the current state of experimental and modelling work in this field done by different research groups. The importance of studies on thermodynamic properties and phase diagrams to solve practical operational issues is outlined.

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Section: Spinels In Different Slag Systemssupporting

confidence: 78%

Section: Slags In Cu Metallurgymentioning

confidence: 99%

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Review on operation of spinel-containing slags of the non-ferrous metallurgy

Kleeberg

2022

Materials Science and Technology

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“…In contrast, under rapid cooling rate, an amorphous and glassy slag forms. Because copperbearing phases have not had time to grow enough are primarily encapsulated in the form of fine particles in the rapidly crystallizing glass matrix which are not easily liberated by grinding [15,40,[47][48][49].…”

Section: Applications To Copper Recoverymentioning

confidence: 99%

Mineralogical Properties of the Copper Slags from the SarCheshmeh Smelter Plant, Iran, in View of Value Recovery

Nasab

Bafti

Yarahmadi³

et al. 2022

Minerals

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Annually, hundreds of thousands of tons of slags are involved in the reverberator and flash smelting as well as converting operations of Cu-Fe sulfide concentrates to produce matte in the Sar Cheshmeh copper smelter plant, Iran, disposed in the landfill and cooled in air. Due to their relatively high average copper content (about 1.5 wt%), a mineral processing plant based on the flotation process has recently been established to produce thousands of tons of Cu-sulfide concentrate after slag crushing and fine grinding operation. In order to make the flotation process more efficient, more knowledge is required on the form and origin of the copper losses in the slag. To achieve this, mineralogical studies of the slags using optical microscopy, X-ray diffraction (XRD), and scanning electron microscopy (SEM) methods have been carried out. Mineralogical analyses showed the main part of copper losses into the semi- to fully-crystallized magnetite-rich reverberator and flash slags characterized by crystal–glass matrix ratio ≤ 1 is moderate to coarse particles of Cu-Fe sulfides, i.e., chalcopyrite (CuFeS2) and bornite (Cu5FeS4), that are mainly chemically entrapped. In contrast, the mechanically entrapped fine- to coarse-grain (from 20 up to 200 µm) spherical-shaped of high-grade matte particles with chalcocite (Cu2S) composition containing droplets or veinlets of metallic copper (Cu0) are the dominant forms of copper losses into the converter slags characterized by crystal–glass matrix ratio > 1. From the value recovery point of view, our result show that the fully crystallized slags containing moderate- to coarse-grain copper-bearing particles will result in efficient recovery of a significant amount of entrained copper due to better milling response compared to semi-crystallized ones due to locking the fine- to moderate-grain copper particles in the silicate glassy matrix. Laboratory-scale grinding experiments showed that normal (≤74 μm) to fine (≤44 μm) grinding of high- Cu grade slags lead to a significant increase in the liberation degree of copper particles. in contrast, the increase in fine particle fractions (<37 μm) due to re-grinding or ultra-fine grinding of the originally low-Cu grade slags does not lead to the liberation of copper particles, but it will reduce the efficiency of the flotation process. This study suggests that the highest rate of copper recovery of the slag by the flotation process will be obtained at particle size 80% passing 44 µm which has also reached the optimal liberation degree of copper-bearing particles.

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Composition Modification of ZnO Containing Fayalite Slag from Secondary Source Copper Smelting

Cited by 2 publications

References 6 publications

Review on operation of spinel-containing slags of the non-ferrous metallurgy

Review on operation of spinel-containing slags of the non-ferrous metallurgy

Mineralogical Properties of the Copper Slags from the SarCheshmeh Smelter Plant, Iran, in View of Value Recovery

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