Mechanical Characteristics of Magnetite Particles in …
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 ...
Magnetite and Carbon Extraction from Coal Fly Ash Using Magnetic …
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.
Development of magnetic flotation hybrid separation …
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 …
Desulfurization mechanism of high-sulfur coal by
During magnetic separation, a certain amount of coal powder is brought out in the processing of pyrrhotite, resulting in a low recovery rate of clean coal. If the magnetic separation device is improved and wet magnetic separation is adopted, the recovery rate of clean coal will be enhanced, and the desulfurization rate can be …
Coal preparation using magnetic separation. Volume 5.
@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 …
Review on coal-based reduction and magnetic …
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 …
Formation of pyrite in the process of fine coal …
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 …
Magnetic separation of coal fly ash from Bulgarian power plants
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 …
Using microwave pretreatment to improve the high-gradient magnetic …
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 …
Maceral and pyrite partitioning through high-gradient magnetic
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 …
Coal-Based Reduction and Magnetic Separation Behavior …
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 …
Minerals | Free Full-Text | Removal of Iron from …
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 …
Magnetic desulfurization of coal | IEEE Journals
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 …
Developing high gradient magnetic separators for greener …
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 …
Fine coal desulfurization and modeling based on high-gradient magnetic
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].
Coal pyrite microwave magnetic strengthening and electromagnetic
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 …
Application of coal-based direct reduction-magnetic separation …
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 …
Application of Coal-based Direct Reduction-Magnetic Separation …
@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}, …
Recovery of Iron from Lead Slag with Coal-Based Direct …
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 …
Magnetic desulfurization of coal | Semantic Scholar
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 and Magnetic Separation …
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 …
(PDF) Review on coal-based reduction and 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 temperature.
Magnetic Separation | SpringerLink
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.
Review on coal-based reduction and 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 temperature. The metallic iron particles aggregate and grow, and the particle size continuously increases to be suitable for magnetic separation.
Review of Coal-Fired Electrification and Magnetic …
Pre-combustion desulfurization is mainly achieved by gravity separation, flotation, magnetic separation, electric separation, …
Development of magnetic flotation hybrid separation
The increase in magnetic property by microwave heating at 850 W and 2.45 GHz was not sufficient to enhance the removal of considerable amount pyritic sulfur from the coal by magnetic separation at ...
Separation and Purification Technology
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.
Using microwave pretreatment to improve the high-gradient magnetic …
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 …
(PDF) Review on coal-based reduction and magnetic …
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 …
Review of Coal-Fired Electrification and Magnetic Separation …
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 …