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 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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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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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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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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Activated charcoal is thought to offer several other benefits, including less gas and flatulence, lower cholesterol levels, and improved kidney function. Some people claim that it helps whiten ...
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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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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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Several mechanisms were responsible for the NO x reduction, including lower flame temperature from the addition of the water, staged combustion from cofiring in lowNO x burners, and the CWM acting as a reburn fuel when injected in upper level burners.
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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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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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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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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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Preparation of slurry. The slurrying experiments were performed by mixing the coal sample with 5%, 10%, 15%, and 20% (mass ratio of dry sludge to dry coal) modified sludge and sludge. The SCWS and modified sludge coal water slurry (MSCWS) were prepared using a dry slurrying process as follows.
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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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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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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 desalinating coal Fratalocchi, Mazzone, and their team produced was a 20centimeter by 20centimeter slab of coal that turned Red Sea water into drinking water at a rate of liters per square meter per hour. But the system can work at any scale. A 16 by 16 centimeter square of carbonized compressed powder could provide enough water for a ...
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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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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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Wastederived slurries can be burned both in a fluidized bed and when injected into a boiler furnace. This paper is the first to analyze the dynamic characteristics of ignition and combustion of a group of three slurry droplets based on coal slime, water, and waste industrial oil in a lowtemperature air flow with a temperature of 500600 °C and velocity of m/s.
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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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The effects of several parameters in terms of the fuel category, the heating rate, the coal/coke mass flow ratio, the CO2 partial pressure, and the Ca/S molar ratio on the ignition and burnout ...
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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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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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يرغب أحد موردي المواد من بلجيكا في إنتاج مسحوق الحجر الجيري لملابسه...
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