The fayalite formation creates localized melt zones that form' hot-spots' for microwaves and enhances the heating rate and, consequently, the reduction kinetics. This study evaluates the carbothermal microwave reduction of low-grade banded hematite jasper iron ore for the preparation of potential feedstock for the a

The major phases, in the copper slag are fayalite and magnetite while spinel, ulvospinel, metallic iron, calcium oxide and barium sulphide are minor phases and all these are devoid of gold or platinum. ... Pre-concentration, by physical beneficiation, can be carried out to recover the two different types of by-products such as magnetite and the ...

Iron in the form of fayalite in copper tailings poses a challenge for traditional beneficiation methods due to its fine particle size. In this work, iron present in copper tailings was efficiently recovered by reducing fayalite to metallic iron and subsequently separating it from gangue using the low-intensity magnetic separation.

The smaller amount of SiO 2 content might not promote the fayalite formation. However, Li et al. [15] reported that the addition of sodium sulfate could suppress the formation of fayalite ...

2.1. Raw Materials. The chemical compositions of copper slag used in this study are given in Table 1.The total iron content of copper slag is 39.85%, and the content of SiO 2, Cu, Pb and Zn are 30.81%, 0.33%, 0.22% and 2.81%, respectively.The minerals of copper slag determined by X-ray diffraction (XRD) are mainly fayalite and magnetite, as shown in Fig. 1.

The beneficiation of low-grade ores particularly with a complex mineralogical association of iron with silica and alumina particles is a challenging proposition to all mineral scientists. Thus, many iron ore deposits of India require alternate beneficiation approaches to produce an acceptable feed for iron and steel making.

the fayalite phase or glass phase. Spot analysis from electron probe micro – analyzer (EPMS) images indicated an unusually high content of copper compared to any other metal. We elucidate that, this was due to the inefficient processing techniques employed during operational years of the mine. The relative compositions of Co, Fe, Ni and

Direct reduction is critical for converting iron ore into metallic iron at temperatures below 1200 °C, and the presence of fayalite can significantly impact the reduction process's …

fayalite is about 1208 ℃, the reduction of fayalite can be divided into two regions, i.e., the solid reduction region from 806.79 ℃ to 1208 ℃, which is a solid reduction reaction of fayalite, and smelting redution region from 1208 ℃ to 1400 ℃, where the state of fayalite is liquid. With the increase of temperature, the

The fayalite structural changes indicated that the [AsO 4] tetrahedron in sodium arsenate combined with the ... Mechanism of mineral phase reconstruction for improving the beneficiation of copper and iron from copper slag [J]. JOM, 2016, 68(9): 2341âˆ'2348. [31] BANCROFT G M, NESBITT H W, HENDERSON G S, O'SHAUGHNESSY C, WITHERS A C ...

The traditional beneficiation techniques have difficulty recovering metals from copper slag because of the tight mineral embedding. Furthermore, ... Fayalite is formed by the reaction of FeO and SiO 2 during the smelting of copper concentrate. As can be seen, the magnetite and fayalite phases coexisted in the feed, and their characteristic ...

In this study, the flotation behavior of 38–74 μm, 15–38 μm and −15 μm fayalite and magnetite were studied, and the effects of particle size fraction and −15 μm fayalite content on flotation …

The slag is composed of magnetite (Fe 3 O 4) and fayalite (Fe 2 SiO 4), validated using XRD, as shown in Figure 2, and, lastly, analytic grade activated carbon from Sigma-Aldrich/Merck. The concentrate went through a froth flotation process for four hours at a pH of 11–11.4. The pH was raised using calcium oxide and 40 g/ton of xanthate, and ...

Recovery of Zinc and Copper from Lead Slag by the Combined Process of Beneficiation and Roasting ... and fayalite is the main crystalline phase. Nickel and cobalt are mainly distributed in fayalite phase in the form of ferrite and silicate . From the viewpoint of environmental protection, copper slag is classified as a hazardous solid waste ...

From the present study of fayalite crystal phases in two types of copper slag - flash smelting furnace slag and converter slag the following conclusions can be drawn: • Despite the complex ...

This study investigates upgrading of low-grade banded hematite quartzite iron ore (Fe ~31%). Conventional beneficiation was found to be futile. The susceptibility of iron phases to microwave exposure and their selective absorption assists in the liberation of iron values. Microwave exposure of coarse particles at 540 W for 10 min yielded a concentrate with Fe …

Elemental iron in the copper slag mainly existed in the form of fayalite and magnetite, and the copper was present in sulfide form with fine size, as well as being closely embedded in the fayalite matrix, revealing that traditional physical beneficiation process may result in poor valuable metal recovery. (2)

Flotation is the dominant beneficiation method at present, ... However, in order to float out copper sulfide encapsulated in fayalite, a large amount of energy is required to fully grind the ...

The coal-based reduction of fayalite was characterized using thermogravimetric (TG) and differential TG methods with reduction temperatures from 1123 to 1273 K. The results of fayalite isothermal reduction indicate that …

The iron resources in nickel slag were recycled by oxidation and magnetic separation. The effects of holding time, temperature, air flow rate and basicity on the crystallization of magnetite were investigated systematically. Moreover, the influence of particle size and magnetic flux density on the recovery and grade of iron during the magnetic …

La fayalite, est une espèce minérale du groupe des silicates et du sous-groupe des nésosilicates constituée de dioxyde de silicium (SiO2) et de fer.Elle possède ainsi la formule chimique Fe 2 SiO 4 avec des traces ou impuretés en manganèse (Mn). Relativement rare dans la nature elle est très fréquente dans les scories de l'industrie du fer.

beneficiation, oxidation-magnetic separation and carbothermal reduction process. Han et al. [10] utilized the grinding and beneficiation method to explore the recovery of Fe from ... fayalite is ...

Fig. 2 illustrates the iron ore beneficiation process, particularly magnetic separation, resulting in the generation of inevitable tailings. Due to the characteristics of iron ores and the conditions during beneficiation, it is inevitable that approximately 2.5–3 tons of IOTs are generated for every 1 ton of iron ore concentrate produced [7].In 2019, the global annual …

The results of fayalite isothermal reduction indicate that the reduction process is divided two stages. The corresponding apparent activation energy E was gained using the isoconversional and ...

Flotation is the dominant beneficiation method at present, which mainly aims at utilizing the residual copper in the slag (Zhou et al., 2021; Piatak and Parsons, 2015).However, in order to float out copper sulfide encapsulated in fayalite, a large amount of energy is required to fully grind the copper slag, while other valuable elements are not utilized (Guo et al., 2018a).

How to utilize low grade complex iron resources is an issue that has attracted much attention due to the continuous and huge consumption of iron ores in China. High-aluminum iron ore is a refractory resource and is difficult to upgrade by separating iron and alumina. An innovative technology involving synergistic reducing and synergistic smelting a high-aluminum iron ore …

The iron content in fayalite, wasted from the copper production, is high and can be used as a raw material in the ferrous extractive metallurgy. ... Ultimately, the beneficiation efficiency of ...

The separation of copper and arsenic has always been a major problem of the flotation beneficiation process, which is affected by the multiple factors: the chemical speciation and mineralogical structure of elements in slag as well as the processing conditions such as pH of the pulp, the concentration of agents and the number of additives, etc. (Ma et al., 2016; Alter, …

The broadened peak areas at 23.4 • are assigned to the presence of primarily amorphous silica [48]. The raw silica obtained in 3 M H 2 SO 4, 6 M HNO 3, and also for 12 M of HCl and HNO 3 ...

Fayalite (47.4%) was identified as the main phase in CSS by XRD refinement along with other phases of hedenbergite (38.7%), magnetite (11.0%) and iron (2.9%). ... products (concentrate and tailings), Zhou et al. revealed the factors affecting the separation of Cu and As in the beneficiation process from the perspectives of mineralogy and ...