In this paper, coal tar pitch binder and BJ additive were used in briquetting and carbonizing process of coal powder. The results showed that BJ effectively activated cold state cohesiveness of the pitch and make it bond the coke particles to a firm briquette at room temperature .Carbonizations of coal and coal tar pitch achieved obvious ...
The present work elucidates the compaction and the densification behavior of iron powder and coal fly ash (CFA) mixtures during powder metallurgy (P/M) processing. The flowability and the compressibility characteristics of the starting materials were exhibited through Hausner ratio and Carr's index. Morphological, elemental and …
The explosibility of the coal used in the system was measured, and the hazards of the process were analyzed. Explosion prevention and protection methods ap-plied in the …
The coal powder prepared by the coal powder and the preparation process thereof has the advantages of good hydrophobicity, easy storage and transportation and high combustion heat efficiency. The invention discloses coal powder, the surface of which is provided with a hydrophobic layer made of hydrophobic materials, and the coal powder …
Coal-based Carbon Dots (C-CDs) have gradually become a research focus due to the abundant raw materials and low preparation cost. Still, before coal-based carbon dots are widely used, a systematic biological toxicity study is the basis for the safe utilization of C-CDs. However, the level of toxicity and the mechanism of toxicity of C …
@article{Liang2024IntensificationOF, title={Intensification of flotation separation process of residual carbon from coal gasification fine slag using ultrafine carbon particles conditioning}, author={Yannan Liang and Hainan Wang and Ruifeng Chen and Danlong Li and Quanzhi Tian and Lei Li and Haijun Zhang}, journal={International Journal of Coal ...
According to Fig. 1, it can be found that the particle size of FS-A (D 50 = 351.30 µm) is significantly larger than FS-B (D 50 = 17.29 µm), which is because FS-A is the slag that settles first at the bottom of the settling tank in the process of CGFS collection. Both FS-A and FS-B are mainly composed of SiO 2, anorthite, tephrite, Fe 2 O 3 and …
Low ash coal demand has been increased in integrated steel plants, coal-fired power plants and, cement industries due to global warming gas emissions cut and increase in productivity (Wang et al., 2019; Sriramoju et al., 1016).Typical Indian coal washeries adopted dense medium cyclone for coarse coal separation and froth flotation …
3.4. Preparation Process of Coal Gangue Powder. CG has high crystallinity and low activity, making it difficult to generate hydration products to provide strength. To use CG as a geopolymer raw material, CG needs to be ground into powder to improve its activity. Figure 9 shows the preparation process of CGP. CG is first …
This process decouples the two steps, among them, coal pyrolysis converts the hydrogen in coal to H 2 to the maximum extent without being consumed, and char gasification causes the coke react with the water vapor in the gasification agent (C + H 2 O ↔ H 2 + CO) to generate H 2 and CO. Through cooperative matching of the two stages, …
In this work, SiC ceramics were prepared by spark plasma sintering (SPS) using alumina and rare earth oxides (RE2O3, RE = Gd, Y, Sc) as liquid phase sintering additives. Displacement shrinkage curve with the temperature, as well as with temperature and time, has been drawn by recording the displacement, time, and temperature of the …
The optimum preparation conditions for the porous sound-absorbing material were a proportion of fly ash of 50% (wt.%), percentage of coal powder of 30% (wt.%), sintering temperature of 1130°C, and sintering time of 6.0 hr, which were determined by analyzing the properties of the sound-absorbing material.
The U.S. coal industry serves a vital role in the nation's economy by producing fuel for more than half of its electricity. Despite the industry's importance, industry financial data for 2005—the strongest year for the coal industry in recent years—shows that it is a relatively small industry with revenues totaling $20 billion to $25 billion and net income between …
The flowsheet for a coal preparation plant can typically be represented by a series of sequential unit operations for sizing, cleaning, and dewatering (Fig. 18.1).This sequence of steps is repeated for each size fraction, since the processes used in modern plants have a limited range of applicability in terms of particle size (Osborne, 1988).As a …
Coal gasification slag (CGS) is a solid waste produced in the process of coal gasification reaction. Coal gasification is the process of reacting coal with gasification agents (hydrogen, air, oxygen, and water vapor) at a certain temperature and pressure to convert the combustible part of coal into combustible gas, while the ash in coal is …
The optimum curing temperature of coal gangue concrete is 100°C, the optimum water-binder ratio is 0.43, and the optimum sand ratio range is 0.37 to 0.40. In addition, the water-binder ratio should be strictly controlled during the preparation process of dry powder activator coal gangue concrete.
1. Introduction. Cement, as a powdered hydraulic cementitious material, is the most widely used cementitious material [[1], [2], [3], [4]].However, the cement production process emits a large amount of CO 2, which causes a great harm to the natural environment [[5], [6], [7]].Therefore, the study of new eco-friendly cementitious materials …
The small particle size, large surface area, and high ambient temperature of the coal powder preparation process distinguish spontaneous combustion that takes place in the high-temperature environment of a power plant from the coal spontaneous combustion process in coal mines, coal storage, coal bunkers, and other conditions. …
1. Introduction. Coal is the world's largest fossil strategic energy reserve, and mining and utilization technologies are constantly innovating. Driven by carbon neutral and carbon emission reduction policies, the clean utilization technology of coal has also achieved continuous breakthroughs [1, 2].Coal gasification is the core process for coal …
For the clean and efficient utilization of coal, coal preparation is an important measure to solve the problem of air pollutant emissions, solid waste generation and save coal resources in the world [1, 2].Screening is the basic process for cleaning and efficient utilization of coal, and is mainly realized via vibrating screen [3].A conventional large …
1. Introduction. Coal gasification slag is a by-product from coal gasification process in Integrated Gasification Combined Cycle (IGCC) system. In the gasifier, molten ash originated from the mineral component in coal flows down into a water quenching system, which leading to the formation of glassy coal gasification slag [1], [2], [3].Before …
Characteristics of pulverized coals have significant influence on the spontaneous combustion and explosion processes. This paper presents an experimental and theoretical framework on physico-chemical characteristics of coal and their interrelations from spontaneous combustion and explosion perspectives. The chemical …
Compared with using C1 chemicals and low molecular weight organics, the process and preparation time when inexpensive low-rank pulverized coal is employed as a carbon source to prepare CNTs directly via catalytic pyrolysis are considerably shorter and the preparation cost is lower [31, 52]. Therefore, catalytic pyrolysis has received …
The coal tar pitch powder was used with each of 22 kinds of dispersants prepared coal tar pitch water slurry, and 6 kinds of dispersants were selected to prepare coal tar pitch water slurry with ...
Why Coal Preparation? Remove extraneous, non-combustible material. Ash reduction. lower particulates. reduced ash handling at power station. Sulfur reduction (lower SO X …
1. Introduction. Steam coal is an important coal resource and that is used as a fuel in electric power plants to generate steam for producing electricity, it accounts for large proportion in the coal structure [[1], [2], [3]].Coal preparation is a key link to achieve effective improvement in the quality of steam coal for its clean utilization [[4], [5], [6]].
Acknowledgements. This work had received the financial support from the National Natural Science Foundation of China (No. U21A20325), the National Key Research and Development Project (Grant No. 2019YFC1904301), the Joint Fund of the Yulin University and the Dalian National Laboratory for Clean Energy (No. YLU-DNL …
In this study, effectiveness of KAT Process, dry coal preparation process developed by KIGAM (Korea Institute of Geoscience and Mineral Resources), was …
Characterisation of frother properties in coal preparation process water. Minerals Engineering, Volume 110, 2017, pp. 47-56. Ghislain ... A hybrid intelligent optimization approach to improving quality for serial multistage and multi-response coal preparation production systems. Journal of Manufacturing Systems, Volume 47, 2018, …
International Journal of Coal Preparation and Utilization publishes original research papers, short communications, review articles, book reviews, and symposium announcements covering all aspects of coal preparation. The journal is significant reading for all individuals involved with coal preparation, including those in operations, …