Search for Articles:
Title / Keyword
Author / Affiliation / Email
Journal
Article Type
 
 
Advanced Search
 
Section
Special Issue
Volume
Issue
Number
Page
 
5.5
3.2
Journals
Energies
Special Issues
Low-Grade Coal Beneficiation
energies-logo
Submit to Energies Review for Energies Propose a Special Issue

Journal Menu

► Journal Menu

Journal Browser

► Journal Browser
share announcement

Low-Grade Coal Beneficiation

A special issue of Energies (ISSN 1996-1073). This special issue belongs to the section "H3: Fossil".

Deadline for manuscript submissions: closed (16 April 2024) | Viewed by 7034

Special Issue Editors

Dr. Binoy K. Saikia

E-Mail Website
Guest Editor
Coal Chemistry Division, CSIR-North East institute of Science & Technology, Jorhat-785006, Assam, India
Interests: Carbon Nanomaterials and their Application; Environmental Nano-mineralogy; Aerosol Chemistry
Dr. Xing Fan

E-Mail Website
Guest Editor
College of Chemical and Biological Engineering, Shandong University of Science and Technology, Qingdao 266590, China
Interests: coal chemistry

Special Issue Information

Dear Colleagues,

Coal is a naturally occurring carbonaceous material used as a source of energy. The quality of coal is determined from its various physico-chemical properties such as moisture content, volatile content, ash content, calorific value, fouling or slagging propensities, sulfur/nitrogen/mercury contents, hardgrove grind ability Index. The iron and steel industries all over the world have grown rapidly, but prime coking coal with adequate properties that yield metallurgical coke is becoming increasingly difficult to obtain. Thus, there is a considerable economic incentive to use low-quality/grade coals instead of coking coals whenever possible. Thus, there is growing importance of beneficiation of low-grade (low-quality) coals considering the declining of high-grade coal around the world. Approximately one-third of the coal produced in the world, except for China, is low-grade. The low-quality coals cannot be used directly in industries due to it’s poor physico-chemical properties. Thus, the different aspects of value addition/beneficiation to low-quality coals are very much essential. Therefore, attempts are essentially important to identify the potential of such low-quality/grade coal as a source of energy and value-added products for the future. The cleaning of low-quality coal (coal beneficiation) by using physical and chemical methods has been studied since long back, however there is a need for the advanced and non-toxic process for the cleaning and conversion of low-grade coal needs to be developed. This special issue aims to report some of the efficient and facile beneficiation processes for utilization of the low-grade coals along with the application of advanced level coal characterization techniques in order to open up a new avenue for utilization of such low-grade coals and coal fines all over the world.

We look forward to receiving your contributions. It is recommended to send a tentative title and a short summary of the manuscript to Energies Editor Ms. Laura Chen <>.

Dr. Binoy K. Saikia
Dr. Xing Fan
Guest Editors

Manuscript Submission Information

Manuscripts should be submitted online at www.mdpi.com by registering and logging in to this website. Once you are registered, click here to go to the submission form. Manuscripts can be submitted until the deadline. All submissions that pass pre-check are peer-reviewed. Accepted papers will be published continuously in the journal (as soon as accepted) and will be listed together on the special issue website. Research articles, review articles as well as short communications are invited. For planned papers, a title and short abstract (about 100 words) can be sent to the Editorial Office for announcement on this website.

Submitted manuscripts should not have been published previously, nor be under consideration for publication elsewhere (except conference proceedings papers). All manuscripts are thoroughly refereed through a single-blind peer-review process. A guide for authors and other relevant information for submission of manuscripts is available on the Instructions for Authors page. Energies is an international peer-reviewed open access semimonthly journal published by MDPI.

Please visit the Instructions for Authors page before submitting a manuscript. The Article Processing Charge (APC) for publication in this open access journal is 2600 CHF (Swiss Francs). Submitted papers should be well formatted and use good English. Authors may use MDPI's English editing service prior to publication or during author revisions.

Keywords

  • low-grade coal
  • low-quality coal
  • coal characterization
  • chemical beneficiation of coal
  • physical beneficiation of coal
  • dry coal beneficiation
  • value addition to low-grade coal
  • value added products from low-grade coal
  • low-grade coal and environmental issues
  • energy from low-grade coal

Published Papers (3 papers)

Download All Papers
Order results
Result details
Show export options expand_more Show export options expand_less
Select all
Export citation of selected articles as:

Research

14 pages, 3432 KiB  
Article
Study of the Microstructural Characteristics of Low-Rank Coal under Different Degassing Pressures
by Yuanzhen Ma, Meng Wang, Xinzhuo Zhao, Xuguang Dai and Ye He
Energies 2022, 15(10), 3691; https://0-doi-org.brum.beds.ac.uk/10.3390/en15103691 - 18 May 2022
Cited by 3 | Viewed by 1127
Abstract
Low-rank coal samples from the Xishanyao Formation in the southern Junggar basin of Xinjiang were processed under different negative pressures in order to examine the microstructural characteristics of low-rank coal reservoirs. The pore structures of low-rank coal under different negative pressures were tested [...] Read more.
Low-rank coal samples from the Xishanyao Formation in the southern Junggar basin of Xinjiang were processed under different negative pressures in order to examine the microstructural characteristics of low-rank coal reservoirs. The pore structures of low-rank coal under different negative pressures were tested using scanning electron microscopy, low-temperature nitrogen adsorption–desorption, and water saturation and centrifugal low-field NMR experiments. The results showed that for the low-rank coal samples from the study area, a high portion of the porosity and surface area came from micropores and small pores; the fractal dimension of the adsorption pores of the low-rank coal samples was divided into surface fractal dimension D1 and structural fractal dimension D2, which showed that the microstructure of the low-rank coal from the study area was complex. The transverse relaxation times T2 of the low-rank coal samples in the test were approximately 0.1~2.5, approximately 10, and greater than 100 ms; the T2 spectrum had basically three peak types. By combining scanning electron microscopy and nuclear magnetic resonance tests, it was concluded that the pore connectivity of the low-rank coal reservoirs in the study area was poor and the effective porosity was relatively low, which may be unfavorable for the exploration and development of coalbed methane. Full article
(This article belongs to the Special Issue Low-Grade Coal Beneficiation)
►▼ Show Figures

Figure 1

16 pages, 4072 KiB  
Article
Processing Studies on Banded Hematite Quartzite’s of Sandur Sciht, Karnataka, India
by Aspari Kumara Swamy, Suresh Nikkam and Palthur Sharath Kumar
Energies 2022, 15(7), 2542; https://0-doi-org.brum.beds.ac.uk/10.3390/en15072542 - 30 Mar 2022
Viewed by 2620
Abstract
The greater demand for high-quality iron ores has forced the iron and steel industries to utilize low-grade iron ores, such as banded hematite quartzite (BHQ). In the present work, a striped hematite quartzite sample from the Haraginadoni area, in the Sandur schist belt, [...] Read more.
The greater demand for high-quality iron ores has forced the iron and steel industries to utilize low-grade iron ores, such as banded hematite quartzite (BHQ). In the present work, a striped hematite quartzite sample from the Haraginadoni area, in the Sandur schist belt, Ballari District, Karnataka, India, was subjected to characterization studies and conventional mineral processing methods to produce pellet-grade concentrate, assayed as Fe > 63.0%, SiO2 + Al2O3 < 7%, (Al2O3/SiO2 < 0.5). The sample was analyzed as 35.70% Fe, 47.44% SiO2, 0.75% Al2O3, 0.06% Mn, 0.07% TiO2, 0.03% P, 0.02% S, and 0.83% LOI. We focused on two routes of beneficiating BHQ samples: (1) conventional gravity followed by reverse floatation and (2) magnetic separation followed by cleaning of magnetic concentrate by reverse floatation. Route 1, achieved pellet-grade concentrate through assaying, and was 63.73% Fe, 6.20% SiO2, 0.19% Al2O3, 0.03% Al2O3/SiO2, and 0.23% LOI, D80 45 µm, with 70.1% Fe recovery and 62.8% concentration efficiency at 39.6 wt% yield. Using Route 2, the process consisted of WHIMS at −74 µm, D80 54 µm, 10,000 Gauss, and with a 3 mm ball matrix, followed by flotation of the WHIMS concentrate, which produced a concentrate through assaying and was 63.34% Fe, 6.30% SiO2, 0.20% Al2O3 (0.03 Al2O3/SiO2), and 0.20% LOI with 77.4% Fe recovery, achieving a 68.8% concentration efficiency at 44.0 wt% yield, meeting pellet-grade specifications. Comparing and analyzing both routes for the concentration methods, Route 2, i.e., WHIMS and the reverse flotation of WHIMS concentrate, was amenable compared to Route 1. Full article
(This article belongs to the Special Issue Low-Grade Coal Beneficiation)
►▼ Show Figures

Figure 1

10 pages, 1707 KiB  
Article
Insight into Relationship between Thermal Dissolution of Low-Rank Coals and Their Subsequent Oxidative Depolymerization
by Yugao Wang, Xiaochen Liu, Zhilei Wang, Chuan Dong, Jun Shen and Xing Fan
Energies 2022, 15(1), 32; https://0-doi-org.brum.beds.ac.uk/10.3390/en15010032 - 21 Dec 2021
Cited by 5 | Viewed by 2123
Abstract
Oxidative depolymerization of low-rank coals is promising for obtaining benzene carboxylic acids (BCAs). However, it is hindered by the low yield of BCAs along with a large number of alphatic acids. Thermal dissolution could modify the physico-chemical structural features of low-rank coals, which [...] Read more.
Oxidative depolymerization of low-rank coals is promising for obtaining benzene carboxylic acids (BCAs). However, it is hindered by the low yield of BCAs along with a large number of alphatic acids. Thermal dissolution could modify the physico-chemical structural features of low-rank coals, which is expected to improve the oxidation of LRCs. In this paper, lignite and subbituminous coal were firstly subjected to thermal dissolution with cyclohexane at 250 °C for 2 h. Then, the raw coal and the corresponding thermal insoluble portion (TIP) were oxidized by NaOCl under the same conditions. The residual yields of TIPs oxidation were both lower than those of raw coals oxidation, indicating that TIPs were more easily oxidized than the raw coals. The yield of BCAs obtained by TIPs oxidation was above 19% higher than that from the oxidation of raw coals. Meanwhile, the selectivity of BCAs was improved in the resulting oxidation products from TIPs compared with that from the raw coals. The relationship between BCAs generation and thermal dissolution of low rank coals was investigated by ultimate analysis, Fourier transform infrared spectroscopy, and nitrogen adsorption-desorption analysis. The results suggested that thermal dissolution could enrich aromatic portion in the remaining TIPs, resulting in an increasing of the yield and selectivity of BCAs. Simultaneously, thermal dissolution raised the specific surface area and expanded the looser space structure of TIPS, which were beneficial for the sufficient collision between aromatic structures and oxidant, facilitating the oxidative depolymerization of TIPs. This investigation would provide a novel route for promoting BCAs production by mild oxidative depolymerization of low-rank coals. Full article
(This article belongs to the Special Issue Low-Grade Coal Beneficiation)
►▼ Show Figures

Graphical abstract

Show export options expand_more Show export options expand_less
Select all
Export citation of selected articles as:
 
Displaying articles 1-3
Back to TopTop