Coal powder was placed in a xanthan gum solution having concentration identical to that of the WCWS. The adsorbed suspension was subjected to highspeed centrifugation to separate the wet coal powder. The coal powder was dried in an oven at 60 °C, and pressurized and polished into a tablet with a thickness of mm and diameter of 2 cm.
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1. Introduction. Coal is the world's largest fossil strategic energy reserve, and mining and utilization technologies are constantly innovating. Driven by carbon neutral and carbon emission reduction policies, the clean utilization technology of coal has also achieved continuous breakthroughs [1, 2].Coal gasification is the core process for coal to produce syngas products, and coal ...
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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.
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Some collectors are made by mixing the common oily collectors with the surfactants to enhance the flotation of low rank/oxidized coals because the surfactants can improve the dispersion properties of common oil droplets in flotation pulp and the adsorption of oil droplets on the coal particle surface (Çelik, 2004, Chander et al., 1994, Polat ...
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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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In view of the disadvantage that coal waste powder(CWP) can reduce the crack resistance of asphalt mortar at low temperature, silane coupling agent KH550 was used to modify coal waste powder. The surface characteristics and modification mechanism of silane coupling agent modified coal waste powder were characterized by using Scanning Electronic Microscopy (SEM). Five kinds of silane coupling ...
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Summary. Bentonite is a type of clay that is prized for its porosity, workability and nontoxic nature. In foundry applications, it is used with coal (bentonitecoal) in sand/green sand molding for metal castings; where it enhances the refractory properties of the mold whilst also increasing strength and flowability.
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Results show that the addition of sludge can improve the static stability for slurries prepared by lean coal, coking coal, and lignite. The effect on stability of coking coalwater slurry is the most significant. The proportion of sludge to lean coal added in the slurry can be maintained at 10% to 15%.
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The preparation of stable waterinoil (W/O) emulsion is critical for the success of production of stable coaloilwater slurry. The present study was undertaken to experimentally investigate the effects of different process variables on emulsion stability. The emulsion was prepared using 100 ml colloid mill with sorbitan monooleate (SM) as ...
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At the Second CoalOil Mixtures Conference, in Danvers, MA, 1979, it was proposed, possibly seriously for the first time, that coaloil slurries should be produced by wet grinding of the coal in oil rather than dry grinding followed by mixing the powder into the oil. Blending powdered coal into fuel oil, typically bunker oil, was, indeed ...
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Mixing 50 mg coal sample and 40 mL deionized water to prepare suspension. The suspension was agitated for 9 min using a magnetic stirrer and the reagents were added following the flotation tests conditions during the process. ... (40 °C). The powder was pressed into coal pieces to measure the water contact angle using the DSA100 contact angle ...
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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 ...
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In this paper, the optimal process conditions for coalbiomass copyrolysis were obtained through pyrolysis experiments. The results show that under the condition of the pyrolysis temperature of 500 °C, the pyrolysis oil yield and positive synergistic effect reach the maximum, and the ratio of coal to biomass raw materials is 1:3. The effects of three loading methods (coal loading on ...
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Moreover, Yi et al. [6] used bio oil from biomass pyrolysis to prepare coal water slurry to confirm that the coal water slurry changed from weak to strong pseudoplastic fluid with the increase in the water content of bio oil. Zhang et al. [7] prepared coal water slurry by using waste engine oil and proposed that the possible stabilization ...
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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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1. Introduction. In China, lowrank coal (LRC) is an important part of thermal coal and coal for the coal chemical industry. With the improvement of coal mining and coal preparation mechanization, LRC is prone to produce a large amount of slime in coal mining and processing due to its porous and fragile characteristics [[1], [2], [3]].These finegrained coal slimes have low calorific value and ...
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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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Coal waste is a byproduct that produced in coal washing plants. The accumulation of coal waste in the nature causes several ecological and environmental problems. The main objective of this study was to investigate the applicability of coal waste powder and its produced ash as fillers in hot mix asphalt (HMA) compared to the conventional fillers.
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The percentage of micropores in the pore structure of coal plays a significant role in methane (CH 4) adsorption, whereas the fraction of organic matter in coal has a positive effect on CH 4 adsorption. Ultrasonic waves were used to excite mixtures of organic solvents and coals with different degrees of deterioration.
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In this study, a microemulsion was prepared by mixing dodecyl trimethylammonium bromide (DTAB) and diesel oil; its effect on lowrank coal flotation was studied via water contact angle and wrap angle measurements. The results show that the clean coal could not be effectively recovered using a single reagent of DTAB or diesel oil.
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Coal mine paste filling technology can effectively solve the problems caused by coal mining and is a key technology to realize green mining and is widely used in coal mining (Qi et al. 2019; Qian et al. 2018; Qi 2020).In coal mine paste filling technology, the performance of filling materials directly determines the filling effect of a coal mine; and the cemented paste backfill (CPB) setting ...
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and foods (Table 1). Viscosity has the effect of resisting fluid motion, so the motion created by a mixer impeller in a ... Water 1 Gasoline 8 Kerosene 10 SAE 10 Oil 60 Olive Oil 81 SAE 30 Oil 175 Glucose 500 Caster Oil 1,000 Corn Syrup 1,400 ... selfcorrecting as the powder dissolves, although extended mixing times may be needed. All ...
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DOI: / Corpus ID: ; Synergistic effects of mixing waste activated carbon and coal in coslurrying and CO2 cogasification article{Wang2021SynergisticEO, title={Synergistic effects of mixing waste activated carbon and coal in coslurrying and CO2 cogasification}, author={Jianbin Wang and Jian Chen and Jianzhong Liu and He Liu and Mingxia Wang and Jun Cheng ...
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The pitch was pretreated using nitric acid (HNO 3) and a thermal treatment step; this process increased the softening point of the pitch which improves the ing properties [6] and allows better physical mixing of the pitch with the coal powder. We investigated the effect of pitch pretreatment conditions on the final carbon properties by ...
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The effects of process parameters such as reformer temperature (700850 °C), steam/coal ratio (S/C) () and air equivalence ratio (ER) () on the composition of product gas, lower heating value (LHV), tar content, yield of product gas, the carbon and water conversions and the cold gas efficiency were investigated.
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Consequently combustion equipment has to be derated. An attempt to overcome this has involved emulsifying water with coaloil mixtures (40 wt % coal, 40 wt % oil, 10 wt % water) with the intention of causing disruptive combustion. ... A 50:50 blend (or 1:1 blend) includes 50% of the volume of the powder as fly ash and 50% of the volume of ...
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A coalwater slurry fuel is defined by a number of factors including its viscosity, particle size, rate of sedimentation, ignition temperature (800850 °C [1,4701,560 °F]), combustion temperature (9501,150 °C [1,7402,100 °F]), ash content and calorific value ( kcal/kg ). When coalwater slurry fuel combusts, over ...
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To accurately verify the effect of coal cuttings on waterbased polymer drilling fluids, we add coal powders to the drilling fluid, and measure their performance after mixing the coal powders. Because the large particles below 60 mesh of coal cuttings mixed in the drilling fluid are removed by the solid control device in field drilling ...
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noted, coal characteristics affect almost every area of plant performance and operation, it is necessary to predict, as much as possible, the physical and economic challenges that will arise when switching coals. Coal blending in its simplest form is the mixing of available coals to produce a blend which combusts well to produce heat and/or power.
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The world production of soaps, detergents, and other surfactants is more than 40 Mt, and lignosulfonates can be used as surfactants or dispersants in various applications such as chelating agents, water reducers of cement, dye dispersants, etc. [ 2 ]. As illustrated in Table, lignosulfonates account for a significant share in the market of ...
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Coal flotation is a complex process involving several phases (particles, oil droplets and air bubbles). These phases simultaneously interact with each other and with other species such as the molecules of a promoting reagent and dissolved ions in water. The physical and chemical interactions determine the outcome of the flotation process.
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Over the years, the federal government has sold leases in the Powder River Basin for about per ton of coal or less. The market price of Powder River Basin coal is about a ton ...
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INTRODUCTION. Coal water slurry (CWS) is a fuel which consists of fine coal particle suspended in water. Presence of water in CWS reduces harmful emissions and makes the coal explosion proof thus makes it useful as a liquid fuel. The concept of coal water slurry dates back to Smith and Munsell (1879) [1] when patented for coal oil utilization ...
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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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