Management of coal processing wastes: Studies on an alternate technology for control of sulfate and chloride discharge

2017 ◽  
pp. 473-483
Author(s):  
Paul T. Behum ◽  
Yoginder P. Chugh ◽  
Liliana Lefticariu
Keyword(s):  
Coal Processing ◽  
Processing Wastes

Emissions in the combustion of coal and coal-processing wastes

2017 ◽  
Vol 60 (4) ◽  
pp. 171-176 ◽  
Author(s):  
G. S. Nyashina ◽  
N. E. Shlegel ◽  
P. A. Strizhak
Keyword(s):  
Coal Processing ◽  
Processing Wastes

scholarly journals Compositional Fibers Based on Coal Tar Mesophase Pitch Obtained by Electrospinning Method

2021 ◽  
Vol 15 (3) ◽  
pp. 403-407
Author(s):  
Aldan Imangazy ◽  
◽  
Gaukhar Smagulova ◽  
Bayan Kaidar ◽  
Zulkhair Mansurov ◽  
...  
Keyword(s):  
Heat Treatment ◽  
Carbon Fibers ◽  
Coal Tar ◽  
Complete Removal ◽  
Mesophase Pitch ◽  
Coal Processing ◽  
Mesophase Formation ◽  
Electrospinning Method ◽  
Processing Wastes ◽  
Sulfur Containing

This research examines the use of coal-processing wastes of Shubarkol deposit (Kazakhstan) in obtaining useful materials such as carbon fibers. For our experiments, mesophase pitch was obtained by coal tar heat treatment at 773 K. Spinnable solution was prepared by crushing mesophase pitch into the pieces with adding poly(methylmethacrylate) as a fiber-forming material and 1,2-dichloroethane as a solvent. Elemental analysis revealed that the chemical composition of mesophase pitch (С – 91.48 %; О – 8.52 %; S – 0.00 %) showed that heat treatment up to 773 K leads to the complete removal of sulfur-containing components which affect the mesophase formation. Raman data of the obtained pitch revealed the appearance of D (1366 cm-1) and G (1605 cm-1) peaks, which are responsible for carbon materials; another peak at 2900 cm-1 shows the presence of C–H bonds. Carbon fibers with the diameter of 0.8–1.75 μm were obtained by electrospinning method in laboratory settings.

Ignition of coal-water fuels made of coal processing wastes and different oils

2018 ◽  
Vol 128 ◽  
pp. 235-243 ◽  
Author(s):  
K.Yu. Vershinina ◽  
D.A. Lapin ◽  
S.Yu. Lyrschikov ◽  
S.A. Shevyrev
Keyword(s):  
Coal Processing ◽  
Processing Wastes

scholarly journals OBTAINING CARBON FIBERS BASED ON COAL TAR BY ELECTROSPINNING METHOD

2021 ◽  
Vol 73 (1) ◽  
pp. 151-159
Author(s):  
A.M. IMANGAZY ◽  
◽  
B. KAIDAR ◽  
Keyword(s):  
Heat Treatment ◽  
Carbon Fibers ◽  
Coal Tar ◽  
Average Diameter ◽  
Mesophase Pitch ◽  
Coal Processing ◽  
Electrospinning Technique ◽  
Electrospinning Method ◽  
Processing Wastes ◽  
Sulfur Containing

This research discusses the use of coal-processing wastes of the Shubarkol Deposit (Karaganda region, Kazakhstan) to produce valuable materials such as carbon fibers. Annually «Shubarkol Komir» JSC alone produces up to 35,000 tons of coal tar as byproduct. In this experiment, mesophase pitch was obtained by coal tar heat treatment at 200 o C. By cracking mesophase pitch into the pieces with the addition of poly (methyl methacrylate) as fiber-forming material and 1,2-dichloroethane as solvent, the spinnable solution was prepared. The elemental analysis of the mesophase pitch showed that the heat treatment up to 200 o C does not contribute to the full elimination of sulfur containing components that influence the forming of mesophase. From the Raman spectra of the pitch, the D peak appearance at ~ 1370 cm-1 and G peak at ~ 1600 cm-1 responsible for carbon products. Carbon fibers with an average diameter of 2.5-3.3 μm were obtained by electrospinning technique in laboratory settings.

scholarly journals Rheological properties of coal water slurries containing petrochemicals

2019 ◽  
Vol 23 (5 Part B) ◽  
pp. 2939-2949 ◽  
Author(s):  
Dmitrii Glushkov ◽  
Sergey Lyrschikov ◽  
Sergey Shevyrev ◽  
Olga Yashutina
Keyword(s):  
Shear Stress ◽  
Rheological Properties ◽  
Storage Time ◽  
Energy Performance ◽  
Coal Preparation ◽  
Coal Processing ◽  
Processing Wastes ◽  
Wetting Agents ◽  
Main Components ◽  
Filter Cakes

In this paper, the rheological properties (viscosity, shear stress, and lamination) of the promising coal-water slurries containing petrochemicals based on filter cakes have been investigated experimentally. The latter are a mixture of water and solid organic wastes produced during coal preparation. It was established that the rheological properties of coal-water slurries containing petrochemicals depend on concentrations and properties of the main components (liquid and solid, flammable, and non-flammable), wetting agents (plasticizers), as well as the storage time and conditions. The rheological properties of the fuel slurries under study were compared with the known properties of coal-water slurries based on different ranks of coal and found to match or even surpass them. Coal processing wastes have high potential as prospective components of coal-water slurries containing petrochemicals in terms of not only their environmental, economic and energy performance but also their rheological properties.

scholarly journals Implications of Sulfur Speciation on the Assessment of Acid Rock Drainage Generating Potential: A Study of South African Coal Processing Wastes

Minerals ◽  
2019 ◽  
Vol 9 (12) ◽  
pp. 776
Author(s):  
Annah Moyo ◽  
Juarez R. do Amaral Filho ◽  
Susan T.L. Harrison ◽  
Jennifer L. Broadhurst
Keyword(s):  
South African ◽  
Acid Rock Drainage ◽  
Acid Neutralizing Capacity ◽  
Total Sulfur ◽  
Coal Processing ◽  
Sulfur Species ◽  
Acid Rock ◽  
Neutralizing Capacity ◽  
Processing Wastes ◽  
Sulfur Speciation

The presence of sulfur in coal processing wastes can lead to environmental impacts, such as acid rock drainage (ARD). However, not all sulfur species are acid-forming, and the implications of sulfur speciation when assessing acid rock drainage potential by means of static chemical tests are not well understood. This study set out to evaluate the implications of different sulfur forms on the assessment of acid rock drainage potential using static laboratory-scale tests and to investigate the reliability of methods for the analysis of such forms for the case of three South African coal processing wastes. Both the International Organization for Standardization (ISO) 157:1996 and Australian Coal Association Research Program (ACARP) C15034 protocols were found to be suitable tools for analyzing the different forms of sulfur. Acid-generating sulfur forms constituted between 53% and 64% of the total sulfur in the wastes evaluated, with the maximum potential acidity (MPA) and net acid-producing potential (NAPP) values calculated on the basis of acid-forming sulfur being significantly lower than those calculated on the basis of total sulfur content. Results also showed that the partial conversion of sulfur species under the relatively aggressive conditions of the acid-neutralizing capacity (ANC) and net acid generation (NAG) tests may overestimate the potential acid generating potential in the case of coal. These findings highlight the uncertainties associated with standard ARD static tests and the importance of taking sulfur speciation into account when calculating the MPA for coal processing wastes.

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