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 ...
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 ...
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.
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 ...
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 ...
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.
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 ...
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 ...
Synergistic effects of mixing waste activated carbon and coal in coslurrying and CO
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.
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.
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 ...
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.
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.
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.
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.
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 ...
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 ...
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 ...
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 ...
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
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.
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.
Fly ash is a fine powder recovered from gases created by the burning of coal. It is the largest component of coal combustion waste, totaling around 70 million tons annually in the United States ...
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.
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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