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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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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Herein, a method of mixed combustion of meager coal and SCCB in a pulverized coal furnace for disposal of SCCB is proposed, and thermogravimetric mass spectrometry (TGMS) is used to characterize the combustion and gas release characteristics. The effects of the heating rate and mixing ratio on combustion are analyzed as well.
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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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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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Coal is a nonpolar hydrocarbon whose surface contains a lot of aliphatic hydrocarbons, aromatic hydrocarbons and other hydrophobic groups, which enhance the hydrophobicity of coal powder. Fig. 2 shows that the contact angle of sample c (dried CWS) is °, which is slightly lower than that of sample a (coal dried after soaking in deionized ...
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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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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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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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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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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 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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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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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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Based on the problems of high carbon emission and high cost of traditional mining methods and filling materials, the tailings powder modified Coal Ganguebased Cementitious Backfill Material (CGCBM) was used for paste filling mining. In this study, the samples were prepared with different tailings powder content and different curing ages.
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Numerical simulation has become a useful approach to explore the complex physical and chemical process inside the supercritical water (SCW) fluidized bed reactor. Due to the drastic and nonlinear variation of water properties near pseudocritical point, the flow field and drag coefficient of SCW flow past a cold particle are considerably different from that of conventional flow. Therefore, in ...
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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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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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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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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 ash was ...
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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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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 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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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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