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 …

The magnetic flotation hybrid separation process, which combines column flotation and magnetic separation, was anticipated to beneficiate a representative coal sample acquired from the El-Maghara coal mine with a relatively high ash percentage of …

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 …

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 novel process involved pyrolysis of high sulfur coal at low temperature and then a dry magnetic separation. For testing the cleaning coal process, a Chinese high sulfur coal, Baisu coal was pyrolyzed in a fixed bed reactor from 400 to 700°C for 30min, and then separated by a dry magnetic separator.

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 …

High gradient magnetic separation technology is a green production technology that has an unparalleled superiority in separating fine and weak magnetic particles. As the characteristics of poor, fine, and heterogeneous in weakly magnetic mineral resources (hematite, wolframite, rhodochrosite, etc.), the importance of …

In magnetohydrostatic separations (MHS), diamagnetic or very weak magnetic materials are separated in paramagnetic or ferrimagnetic solutions placed in a magnetic field. Although MHS has been examined for a variety of materials, it has not been used to separate coal macerals. The work described here represents our preliminary …

For the dry magnetic separation test of Chazhuang coal, the desulphurization rate and ash removal rate are 42.21% and 40.23%, the heat recovery rate is only 57.73%; in the magnetic separation test of Qingdao thermoelectric coal, the desulphurization rate and ash removal rate are 49.10% and 47.88%, respectively, and …

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 …

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 …

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 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 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 …

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 …

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].

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).

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 …

2.1 Introduction. The differences in magnetic susceptibility can be utilized to separate a valuable mineral from its gangue through the magnetic separation method. Similar to other materials, minerals are generally classified into three main categories, namely diamagnetic, paramagnetic, and ferromagnetic.

@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}, …

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 …

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 …

Conventional magnetic separation devices are widely used for the removal of tramp iron from a variety of feed materials and for the beneficiation of ferrous ores. These devices for separation of strongly magnetic materials employ a variety of mechanical designs. Recently developed high gradient magnetic separation devices extend the useful …

@article{osti_6922730, title = {Coal preparation using magnetic separation. Volume 5. Evaluation of magnetic coal desulfurization concepts. Final report}, author = {}, abstractNote = {Magnetic separator designs performed by the four contractors under RP980 were reviewed. A complete plant-conceptual design was developed, based on …

XRD graphs of coal bottom ash separated by wet magnetic separation in 200gauss as a dif ferent particle size. 3.3. State of Ferr ous Material Burned in a Furnace and Thei r Effect of Magnetic ...

Pre-combustion desulfurization is mainly achieved by gravity separation, flotation, magnetic separation, electric separation, …

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 …

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 …

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 ...

In this study, enrichment methods for coal fly ash (CFA) from Omsk thermal power station No. 4 (TPS-4) were investigated. The magnetite and unburned carbon concentrates were obtained by magnetic separation and flotation methods. The wet magnetic separation used in the study increased the magnetite content in the …