The effects of the fineness of coal gangue powder, microwave temperature, and type and amount of chemical activator on the activity and cementitious properties of coal gangue were explored. ... After all the water is added, mixing was continued for 2 min. ③ The mixture was placed into a mold of mm × mm × mm for molding. After ...
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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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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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This chapter contains the findings of the Subcommittee on Adsorption of the National Research Council's Safe Drinking Water Committee, which studied the efficacy of granular activated carbon (GAC) and related adsorbents in the treatment of drinking water. Some attention is given to an examination of the potential health effects related to the use of these adsorbents, but detailed toxicological ...
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This research is aimed at the influence of the hydration environment on the performance of cemented paste backfill (CPB). In this experiment, the CPB was prepared by mixing water at three temperatures (5°C, 15°C, 30°C) and three pH (4, 7, 10). Testing the setting time of CPB and uniaxial compressive strength (UCS) of different ages, a scanning electron microscope (SEM) was used to explore ...
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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]. A study by Xu et al. (2019) examined the effects of coal waste as filler on the functional characteristics of asphalt mastics and ...
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Coal mining. Mining operations can negatively impact water supplies, often with longlasting effects. The fundamental issue involves contamination of nearby rivers, lakes, and aquifers by what comes out of a coal mine—usually highly acidic water containing heavy metals like arsenic, copper, and lead. The process is known as acid mine happens when certain substances (typically ...
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Utilization of iron coke hot briquette (ICHB), prepared by carbonizing coaliron ore composite agglomerate, is considered as an effective countermeasure to achieve low carbon emission blast furnace (BF) ironmaking. ICHB shows high reactivity and thereby presents low postreaction strength, which could have serious impact on the permeability of this paper, the effects of coal and iron ore ...
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On the basis of a variety of mixture models,, the PGM, the Tanaka formula, and the modes of operation shifts, mm fine coal and magnetite powder were uniformly mixed. According to analysis with highspeed dynamic camera technology, the mixing of fine coal and magnetite was controlled by lateral mixing and supplemented by axial mixing.
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Coal mine paste filling technology can effectively solve the problems caused by coal mining and is a key technology to realize green mining and is widely used in coal mining (Qi et al. 2019;;Qi2020). In coal mine paste filling technology, the performance of filling materials directly determines the filling effect of a coal mine ...
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The numerical simulation results showed that as the water supply pressure increased, the internal pressure and water flow velocity in the mixing chamber of the nozzle increased while the air flow rate decreased sharply, resulting the continuous decrease in the relative velocity between gas and liquid.
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Mangi SA, Wan Ibrahim MH, Jamaluddin N, Arshad MF, Ramadhansyah PJ (2019) Effects of ground coal bottom ash on the properties of concrete. J Eng Sci Technol 14(1):338350. ... Admilson J, Zhang W (2018) The effect of mixing and curing sea water on concrete strength at different ages. In: MATEC Web of Conferences, vol 142, pp 16.
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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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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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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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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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Coal gasification slag (GS) is a potential pozzolanic industrial waste discharged during coal gasification. The study aimed to investigate the effect of finely ground GS powder on the fluidity, rheology and viscoelasticity properties of cement paste, which is essential for utilizing GS as a supplementary cementitious material for building materials.
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Further, it is unsafe to store as it is a potential explosive. To address these issues, coalwater mix is a wiser alternative. Coal liquefaction and gasification is economical compared to its pulverized counterpart. It behaves like a liquid fuel in combustion as a fuel [11]. Another advantage of it is that it could be transported in pipeline ...
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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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To accurately verify the effect of coal cuttings on waterbased polymer dril ling fluids, we add coal powders to the drilling fluid, and measure their performance after mixing the coal powders.
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Synergistic effects of mixing waste activated carbon and coal in coslurrying and CO
The effects of the mix proportion and curing temperature on the pozzolanic reaction of fly ash in cement paste were investigated by examining the productions of calcium hydroxide and the pozzolanic reaction ratio of fly ash. It is possible to accurately determine the reaction ratio of fly ash in cement paste from the insoluble residue and the quantity of dissolved Al 2 O 3.
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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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In addition, coal may be made into a coaloil mixture or coalwater mixture to replace petroleum. This type of technology is developing rapidly, with General Motors in the United States currently conducting research and experiments using 3 μm coal powder as automotive fuel. b Developing nuclear energy
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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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The objective of this study was to investigate the influence of mixture composition and water content of the powders on mixing and mixture quality of three binary spice powder mixtures with significant differences in mixing behaviour. Furthermore, powder flowability of the mixture's constituents at various moisture contents were measured, as ...
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Abstract. The preparation of coal water slurry (CWS) as a new substitute for oil and the factors affecting the stability of CWS were studied in this paper. Dry method was used to prepare CWS. Dry coal water slurry refers to the preparation of CWS by grinding coal into powder, then adding water and additives, mixing and stirring.
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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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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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Modarres et al. (2015) investigated the effect of coal waste powder on hot mix asphalt compared to conventional fillers (a combination of mechanical properties and environmental impacts). In this ...
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A material supplier from Belgium would like to produce limestone powder for his custome...
India is rich in various mineral resources and it is an important mineral processing market
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