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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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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The effect of addition sequence for mixed collectors comprising of dodecane(D) and nvaleric acid(A) on lowrank coal flotation was explored by the following three sequences: D first and then A(D + A), A first and then D(A + D), D and A were added simultaneously(M). The total organic carbon, contact angle, zeta potential, and Xray photoelectron spectroscopy results revealed that the coal had ...
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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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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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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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Later it also affects the hardened properties of concrete. The associated effect of prolonged mixing exhibits insufficient water for mixing, higher rate of evaporation and higher rate of hydration than expected. Johanson [16] varied mixing time and measured the homogeneity of concrete by fresh and hardened properties.
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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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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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In a coal preparation plant, typical contaminants in the reused water are pyrite oxidation products (Fe 2+, Fe 3+ and SO 4 2−), soluble inorganic ions released from the inorganic matters in the coal (Ca 2+, Al 3+ and Mg 2+), humic acids and residual flotation reagents. These chemical species can have a profound effect on coal processing [[25 ...
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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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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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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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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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After mixing different explosion suppressants with coal dust and testing the ignition temperature, it is found that when Al(OH) 3 is mixed with coal dust and the mass percentage is 60%, the coal ...
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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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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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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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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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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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Synergistic effects of mixing waste activated carbon and coal in coslurrying and CO
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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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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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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Inert powders played an important role in the explosion inhibition of dust removal equipment and coal gasification this paper, SiO 2, dry water, carrageenan dry water, and NaHCO 3 were adopted to explore the influences of inert powders on the deflagration flame propagation characteristics of mixed pulverized coal by a vertical pipeline. The results showed that the flame brightness ...
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The CO present at the outlet of the decoupled NO removal reactor has a certain effect on the NO reduction effect of the coal char/coal char iron powder, ... The effect of adding water has little effect on CO production. ... Roles of oxygen and iron powder mixing could also be revealed. Herein, SEM images of coal char samples are taken before ...
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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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A concrete mixer as shown in Fig. 2 (also commonly called a cement mixer) is a device that homogeneously combines cement with aggregates such as sand or gravel and water. A typical concrete mixer uses a revolving drum to mix the components. Internal blades are arranged in such a manner to lift and tumble the ingredients and direct the concrete into the circulatory path.
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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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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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Abstract. The main objective of this research was to investigate the effect of coal waste powder as filler material in hot mix asphalt. After sampling the coal waste material from a coal washing plant, it was processed to achieve natural coal waste filler. Furthermore, after incinerating the natural coal waste powder at 750 °C, the coal waste ...
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Based on the analysis of the stress intensity factor, the drilling fluid with coal powders exceeding 100 mesh can reduce the capillary force in microfractures, and in combination with other factors (such as reduced filtration loss and sealing and supporting of the microfractures), improves wellbore stability.
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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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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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