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.
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.
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.
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.
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 ...
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.
Some powder additions require special inline mixing equipment to rapidly combine and disperse powders into a liquid stream. Adding powders under vacuum is difficult, but may be the only way to reduce bubbles in a viscous product. Emulsification. Emulsification is almost an art, since it involves both mixing intensity and the use of stabilization
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 ...
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
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 ...
This paper determines the optimal surfactant concentration for enhancing coal's wettability and explores the wetting mechanism at surfactant concentrations above the critical micelle concentration (CMC) during coal seam water injection. In this study, laboratory experiments and field tests were used to investigate the influence of monomeric surfactants and compound surfactants at various ...
The generated waste is among the prominent 62 environmental problems. Fortunately, the washery rejects are used in many sectors 63 such as the construction industry, as underground backfill ...
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 ...
Synergistic effects of mixing waste activated carbon and coal in coslurrying and CO
2) A specific mass of water is poured into a mixing tank, and the speed of the electric mixer (JHS2) is adjusted to 200 r/min, after which additives are added and fully dissolved in the water. 3) The weighed coal powder is added to the mixing tank, and the speed of the mixer is raised to 1000 r/min and kept there for 15 min. 4) The slurry is ...
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 ...
Download Citation | Study on the effect of mixing water on coal mine filling cemented paste backfill performance under pHT coupling conditions | This research is aimed at the influence of...
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 ...
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 ...
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.
example, coal rank and type, caloric content, composition, size, and intensity) and weighting them according to the size and intensity of the fire may allow us to estimate areas or volumes of burning coal in order to calculate emissions on larger scales. In May 2009, coal fires in the Powder River Basin of . Wyoming and Montana were studied.
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 ...
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 ...
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 ...
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 ...
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 ...
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 ...
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 ...
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.
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.
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 ...
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 ...
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.
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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