The results show that some parameters of the drilling fluid, including viscosity, lubrication coefficient, adhesion coefficient, contact angle, and surface tension, increase after adding coal...
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In the "Sample configuration" stage the sample was prepared by mixing coal powder and mineral powder in six different ratios ( 100:0, 96:4, 92:8, 88:12, 84:16, 80:20). ... a pile of coal powder with infinitesimal grain size can be considered as a large size coal core. This means that the effect of grain size on temperature rising rate ...
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As a raw material, applications of waste activated carbon (WAC) in synergy with coal powder to prepare coal water slurry (CWS) and perform hightemperature gasification is a novel strategy for ...
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void fraction of the coal powder beds is the porosity of particle bed when the voids of coal particle bed are filled with water. Void fraction of CWS was calculated by the following equation (Henterson,, 1978). ε = V. s V. c (2) V. s. where ε, V. c, V. s . referred to as void fraction, volume of coal, and volume of slurry ...
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When the coal powder is mixed in, hydrophilic minerals on the coal surface interact with the water in the water cores, causing some of the coal particles to enter the reverse micelles. As a result of this, the hydrophobic chain of Tween 80 reaches into the oil phase and the water core becomes a hydrated film on the surface of the coal particles ...
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1. Introduction. During the industrial preparation and storage of powder in coal mine, coal chemical industry and thermal power, it is easy to produce floating coal dust and form combustible dust clouds [[1], [2], [3], [4]].Floating coal dust will explode when it meets high temperature or open fire in a limited space, causing huge damage to people and property, and is one of the major hazard ...
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2) A specific mass of water is poured into a mixing tank, and the speed of the electric mixer (JHS2) is adjusted to 200 r/min, after which additives are added and fully dissolved in the water. 3) The weighed coal powder is added to the mixing tank, and the speed of the mixer is raised to 1000 r/min and kept there for 15 min. 4) The slurry is ...
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Hiremath and Yaragal [97] evaluated the effect of mixing method (threestage mixing vs. fourstage mixing), speed of mixing (25150 RPM) and time of mixing (1030 min) on RPC properties. The main ...
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In industrial process engineering, mixing is a unit operation that involves manipulation of a heterogeneous physical system with the intent to make it more examples include pumping of the water in a swimming pool to homogenize the water temperature, and the stirring of pancake batter to eliminate lumps (deagglomeration).. Mixing is performed to allow heat and/or mass ...
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Besides, an optimum mix with considerable water resistance was obtained by equal proportions of coal waste and limestone powders, while the CWP and particularly its ash resulted in a more sensitive mix to water [39]. ... Effect of coal waste powder in hot mix asphalt compared to conventional fillers: mix mechanical properties and environmental ...
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This invention relates to a mixed fuel comprising a coal powder or the like and heavy oil obtained by adding and mixing a dilute aqueous solution of a watersoluble highmolecular compound and a carbonaceous solid fuel powder such as coal powder or the like (hereinafter referred to as "coal powder and the like") to heavy oil so as to disperse the coal powder and the like and water (in very ...
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Effect of coal waste powder in hot mix asphalt compared to conventional fillers: mix mechanical properties and environmental impacts ScienceDirect Journal of Cleaner Production Volume 91, 15 March 2015, Pages 262268
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This mix proportion minimizes strength decline in coal gangue powder‐recycled aggregate concrete (CGP‐RAC) while maximizing recycled material replacement. Microscopic analysis revealed that CGP increased the Ca/Si ratio in cement paste, impeding hydration reactions, resulting in a looser internal structure and reduced concrete strength.
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Download Citation | Study on the effect of mixing water on coal mine filling cemented paste backfill performance under pHT coupling conditions | This research is aimed at the influence of...
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Under neutral conditions, it increases with the increase of temperature and age, 37 days; the higher the temperature, the faster the growth rate; the intensity of paste under weak alkaline conditions decreases with the increase of temperature and age.
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Synergistic effects of mixing waste activated carbon and coal in coslurrying and CO
This invention relates to a mixed fuel comprising a coal powder or the like and heavy oil obtained by adding and mixing a dilute aqueous solution of a watersoluble highmolecular compound...
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Chlorides, sulfates, alkalis and solids in mixing water play a substantial role on quality and behavior of fresh and hardened fill from the cementtowater ratio and cement hydration points of view. Table 3 tabulates the chemistry of mixing water. To mix both coal fly ash and OPC, tap water as mixing water was only utilized in this study.
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Performance of fiber reinforced asphalt concrete under environmental temperature and water effects. Constr. Build. Mater. (2010) T. Xu et al. ... Effect of coal waste powder in hot mix asphalt compared to conventional fillers: mix mechanical properties and environmental impacts. Journal of Cleaner Production, Volume 91, 2015, pp. 262268 ...
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Municipal sludge (MS) is used to prepare coal water slurry (CWS). This practice is beneficial for resource utilization and reduces treatment costs and environmental pollution. In this study, alkalimodified municipal sludge (AMS) was prepared with Ca(OH)2 as modifier and mixed with coal to produce AMSCWS. The effect and mechanism of MS and AMS on slurry ability, stability, and combustion ...
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Based on the obtained results in comparison to the reference mix ( a mix containing limestone powder) the coal waste and its ash resulted in higher stability and resilient modulus. Furthermore, the combination of coal waste and limestone powders in equal proportion resulted in a desirable mix with high water resistance.
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For the casting of iron, powdered coal additions or coal substitutes are usually added to greensands to improve surface finish in this way, providing a carbon layer to both the sand grains and the liquid surface. The reactions in the pyrolysis of coal were originally described by Kolorz and Lohborg (1963):. 1. The volatiles are driven out of the coal to form a reducing atmosphere.
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Coal companies generally mix fine coal slime into commercial coal for sale, and some coal companies mix highash fine slime into coal gangue dumps. ... if each reagent has enough time to adsorb at the coalwater interface, a good flotation effect can be obtained. The addition sequence does not seem to be as important as it is considered in ...
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Use the scoop that comes with the can. Other scoops might be slightly different. When measuring the powder, scoop it up and use a clean knife to scrape away excess powder. Don't pack the formula into the scoop. Add the powder to the water and mix well. Never water down formula.
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DOI: / Corpus ID: ; Synergistic effects of mixing waste activated carbon and coal in coslurrying and CO2 cogasification article{Wang2021SynergisticEO, title={Synergistic effects of mixing waste activated carbon and coal in coslurrying and CO2 cogasification}, author={Jianbin Wang and Jian Chen and Jianzhong Liu and He Liu and Mingxia Wang and Jun Cheng ...
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1 Citations Metrics Abstract Watercoal interactions are dominant factors that affect water quality in coal mines. Using lixiviation, the effects of watercoal interactions on pH, salinity, and hazardous elemental enrichment in coal mine water and associated trends were simulated and analyzed.
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When water is adopted as the coal slag discharge medium in the process of drilling in soft coal seams, coal slurry with great agglomerated and viscous is formed after the water invades the coal powders. As the dry coal powders gradually mix with the wet coal slurry, the strength and consistency of the coal slurry will continue to be promoted.
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example, coal rank and type, caloric content, composition, size, and intensity) and weighting them according to the size and intensity of the fire may allow us to estimate areas or volumes of burning coal in order to calculate emissions on larger scales. In May 2009, coal fires in the Powder River Basin of . Wyoming and Montana were studied.
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As illustrated in Fig. 1, the whole briquettes production process involves mixing coal ash with pellet powder, blending water with the mixed powder, briquetting the final blended material, drying the green briquettes, preheating the dry briquettes and carbonizing the preheat briquettes. Bonding strength of different powder briquettes
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