magnetic separation coal

Iron recovery from a lead slag in Henan province was carried out with the technique of coal-based direct reduction followed by magnetic separation. Scanning electron microscopy (SEM) was used to investigate the transformation of iron-containing minerals and the particle size of metallic iron generated by coal reduction. The results …

Coal-based reduction followed by magnetic separation is proposed, which adopts coal as the reductant to reduce iron oxides to metallic iron below the melting temperature. The metallic iron particles aggregate and grow, and the particle size continuously increases to be suitable for magnetic separation.

The magnetic separation technology of fine coal desulfurization is shown in Fig. 1. The high-sulfur fine coal was classified as 0.5 mm/0.25 mm. Microwave energy of different frequencies obtained using a micro-processing system was applied to −0.5 mm/0.25 mm fine coal. The electromagnetic properties of different minerals were used to …

Coal fly ash (CFA) is a technogenic waste formed during coal combustion in thermal power plants (TPPs). The extraction of valuable components from CFA is complicated by the presence of a large amount of amorphous glassy mass and iron. ... After conventional wet magnetic separation, followed by the proposed method for desilication …

In the metallurgical extraction of rare earth elements (REEs), the ratio of contaminant ions to REEs in the leachate dictates the cost and operational efficiency of the downstream processes. The current study …

Abstract: This work is probably the first systematic attempt at using high gradient magnetic separation techniques in coal slurries. The rationale for magnetic desulfurization of …

A technique with coal-based direct reduction followed by magnetic separation is presented in this study for recovering and reusing iron otherwise wasted in vanadium tailings. Process parameters such as usage of additives, tailings/reductant/additives ratio, reduction temperature and time, as well as particle size …

The basic principle involved in high gradient magnetic separation (HGMS) lies in coal being diamagnetic (repulsed by a magnet) while pyrite is paramagnetic (attracted to a magnet). The mag- netic susceptibility of pyrite is 0.3 X 10-6 emu/g while this susceptibility of coal is --0.4 X 10-6 to --0.8 X 10-4 emu/g {1 emu = 1 gauss). If no …

The efficiency of magnetic separation is directly related to the magnetism of the feed ore, and a magnetic difference between the iron minerals and the gangue would facilitate magnetic separation [23], [24]. In coal gangue, kaolinite is nonmagnetic, quartz (SiO 2) and calcite (CaCO 3) are diamagnetic, and minerals containing Mn 2+ ions are ...

Based on this theory, the magnetite particle stress at six typical representative points of the three-product mag-netic separation column is studied, and the relationship between the rising-water flow velocity and the magnetic field strength suitable for the separation of different components is obtained. The friction between the particles and ...

This work is probably the first systematic attempt at using high gradient magnetic separation techniques in coal slurries. The rationale for magnetic desulfurization of coal resides in the paramagnetism of pyrites and their liberation from the coal substance. Principles of magnetic separation are discussed. A model based on the balance of …

Coal-based reduction followed by magnetic separation is proposed, which adopts coal as the reductant to reduce iron oxides to metallic iron below the melting temperature.

Environmentally friendly magnetic coal-based activated carbon (MCAC) with high adsorption performance has been synthesized by using a facile one-step method. ... Cyclic adsorption and magnetic separation. Fig. 7 shows adsorption effect of MCAC-2:1 in 150 ml solution with an initial concentration of 100 mg/L, recorded every 10 min in 60 …

Abstract. Pyrite in fine coal was heated selectively by microwave energy to strengthen its magnetism in this study. Then, the inorganic sulfur in fine coal (−0.5 mm) …

The effect of ore particle size on the magnetic separation products was shown in Fig. 8 (b). The result demonstrates that the iron recovery and metallization rate of coal-based reduction-magnetic separation products increased first and then decreased, while the iron grade was basically constant.

The magnetic properties of pyrite in coal are enhanced by using this method, benefiting magnetic separation [26], [27]. For a low-rank coal, microwave heating decreases the moisture content of coal and increases its calorific value and fixed carbon content, thus improving the quality of lignite energy [28], [29].

The desulphurization effect of graded magnetic separation before combustion of pulverized coal below 0.5 mm is studied.. The main factors affecting specific susceptibility and desulfurization rate are obtained.. The response degree of three factors on desulfurization degree is expressed. • Main influencing factors and the optimization …

Therefore, the magnetic properties of CMAC could accelerate the solid–liquid separation with an applied magnetic field and improve recovery efficiency of the adsorbent. 4. Conclusion. In summary, a series of coal-based magnetic activated carbons were prepared using various Fe sources as additives through a one-step physical …

Magnetic separation of pyrite (FeS 2) from coal for desulfurization is also a common process (Maxwell and Kelland, 1978). The weakly magnetic nature of pyrite, however, requires that the raw ore be pre-treated thermally to convert the pyrite (FeS 2, M s =0.3 emu/g) to more strongly magnetic pyrrhotite (Fe 7 S 8, M s =22 emu/g).

As a result, several previous studies note that upgrading metallurgical solid wastes using coal-based direct reduction-magnetic separation (CBDRMS) can effectively manage metallurgical solid waste. In this process, metallurgical solid waste is converted to sponge iron using CBDR, and subsequently, magnetic separation is carried out to …

Fly ash from three coal-burning power plants in Bulgaria: 'Maritza 3', 'Republika' and 'Rousse East' were subjected to wet low-intensity magnetic separation. The tests were performed at different combinations of magnetic field intensity, flow velocity and diameter of matrix elements. It was found that all parameters investigated affected …

Application of Coal-based Direct Reduction-Magnetic Separation Process for Recycling of High-Iron-Content Non-Ferrous Metallurgical Wastes: Challenges and …

The wet magnetic separation used in the study increased the magnetite content in the magnetic fraction from 10.48 to 12.72 wt % compared to dry magnetic separation.

Coal-based reduction followed by magnetic separation is proposed, which adopts coal as the reductant to reduce iron oxides to metallic iron below the melting …

This article presents the results of research aimed at optimizing the process of recovery of valuable components from ash and slag waste from thermal power plants. In this work, both experimental and theoretical studies were carried out to substantiate the use of magnetic separation methods for ash and slag waste processing. Ash and slag …

The magnetic desulfurization separation process on fine coal is illustrated in Fig. 1.First, the high sulfur fine coal was graded to 0.5 mm/0.25 mm.The microprocessing system administers microwave energy to the 0.5 mm/0.25 mm high sulfur fine coal with different frequencies.The microwave energy is selectively absorbed by different minerals …

In this work, an improved strategy for alumina recovery and Fe–Si alloy production from CFA by employing vacuum thermal reduction, alkali dissolving, and magnetic separation was suggested. The reduction mechanism of coal fly ash with CaO and Fe 2 O 3 as the additives was examined comprehensively.

DOI: 10.1080/19392699.2022.2059659 Corpus ID: 248042016; Formation of pyrite in the process of fine coal desulfurization by microwave enhanced magnetic separation @article{Zhang2022FormationOP, title={Formation of pyrite in the process of fine coal desulfurization by microwave enhanced magnetic separation}, author={Zhenxing Zhang …

@article{Xu2023ApplicationOC, title={Application of Coal-based Direct Reduction-Magnetic Separation Process for Recycling of High-Iron-Content Non-Ferrous Metallurgical Wastes: Challenges and Opportunities}, author={Xianqing Xu and Zheng-qi Guo and De‐qing Zhu and Jian Pan and Cong-cong Yang and Si-wei Li}, …

The magnetic differences in CGFS in various regions result in different magnetic separation effects [35]. The flotation of CGFS with higher fine–particle content continues to be the preferred method for carbon–ash separation. However, the reagents consumption is large, and the separation effect is low.

The magnetic properties of pyrite in coal are enhanced by using this method, benefiting magnetic separation [26], [27]. For a low-rank coal, microwave heating decreases the moisture content of coal and increases its calorific value and fixed carbon content, thus improving the quality of lignite energy [28], [29] .

The magnetic separation as well as froth flotation has long been utilized to upgrade minerals and materials. Combining both can treat a wide range of types of materials from colloidal to large size, from non-magnetic to strongly magnetic, and from hydrophilic to hydrophobic in many applications such as steel production, coal …

The main sulfur-containing impurity present in coal, pyrite, has a higher permittivity and heats up faster than the bulk coal. Further, the magnetic properties of pyrite in coal are enhanced after heat treatment, which is conducive to the development of magnetic separation technology [24]. Hence, microwave pretreatment of pulverized …

Through the magnetic separation of coal-based reduced products, it is demonstrated that the separation of Cr, V, Ti, and non-magnetic phases can be preliminarily realized. Coal-based reduction and magnetic separation behavior of low-grade vanadium-titanium magnetite pellets were studied in this paper. It is found that …