Simple manual mixing of hydrophobic coal and water is obviously insufficient to produce a stable suspension. ... 75 g of coal powder and 75 mL of water were at the same time placed in the beaker of a hydrodynamic rotarytype mixer Waring blender 80100 with a twoblade impeller of wedge profile, and the wedge angle of the cavitator was α = 60 ...
WhatsApp: +86 18838072829Results 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%.
WhatsApp: +86 18838072829A study by Xu et al. (2019) examined the effects of coal waste as filler on the functional characteristics of asphalt mastics and mixtures. The study investigated the effects of coal waste on asphalt mastics and mixtures considering various fractions of mass (20 %, 40 %, 60 %, 80 %) for fine limestone powder replacement as a filler.
WhatsApp: +86 18838072829Further, the comprehensive performance of the waste oilcoalwater slurry, including slurry ability, stability and fluidity, was found to be best at a water content of 10% and a Tween 80 content ...
WhatsApp: +86 18838072829Over 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 ...
WhatsApp: +86 18838072829Mixing 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 ...
WhatsApp: +86 18838072829Fu et al. [16] and Zhu et al. [17] studied the effects of light oil, fine coal powder, and water content as well as the properties of surfactants on the rheology and stability of synthetic fuels. Guo et al. [18] studied the rheological properties of a new type of synthetic fuel composed of residual oil, coal powder, and water.
WhatsApp: +86 18838072829The main purpose in this study was to understand the interactions of coal particles with three amphiphilic humic acidbased polymers, which were designed and synthesized through the copolymerization of humic acid (HA) with maleic anhydridepolyethylene glycol 400 monoester, methacrylatoethyl trimethyl ammonium chloride or both of them, respectively, abbreviated as HAM, HAD and HMD.
WhatsApp: +86 18838072829Coal 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.
WhatsApp: +86 18838072829Of the different additives, the viscosity reduction effect of Tween 80 in the waste oilcoalwater slurry was best. Further, the comprehensive performance of the waste oilcoalwater slurry, including slurry ability, stability and fluidity, was found to be best at a water content of 10% and a Tween 80 content of 5%.
WhatsApp: +86 188380728291. 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 ...
WhatsApp: +86 18838072829In 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.
WhatsApp: +86 18838072829At 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 ...
WhatsApp: +86 18838072829The 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.
WhatsApp: +86 18838072829Besides, 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 ...
WhatsApp: +86 18838072829The pulping steps were as follows [22]: (1) measure out the weights of coal powder, additives, and liquids (deionized water and waste oil) required to make up the slurry; (2) pour the additives and liquids into a stirring tank with a capacity of 200 mL and adjust the speed of the mixer to 400500 r/min to fully dissolve the additives; (3) add ...
WhatsApp: +86 18838072829Abstract. 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.
WhatsApp: +86 18838072829The particle sizes of the two types of MDS are smaller than those of the dust and sludge from the common iron and steel metallurgical process. 45 This indicates that SFD and WOS are more conducive to mixing with coal and there are more contact points after mixing with pulverized coal, which is beneficial for improving the catalytic effect.
WhatsApp: +86 18838072829Municipal sludge (MS) is used to prepare coal water slurry (CWS). This practice is beneficial for resource utilization and reduces treatment costs and environmental pollution. In this study, alkalimodified municipal sludge (AMS) was prepared with Ca(OH)2 as modifier and mixed with coal to produce AMSCWS. The effect and mechanism of MS and AMS on slurry ability, stability, and combustion ...
WhatsApp: +86 18838072829The coaloilwater slurry is a new type of oilbased synfuel composed of finely pulverized coal, oil and water. It has lower viscosity, lower ignition point and higher heating value than coal ...
WhatsApp: +86 18838072829Abstract. 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 ...
WhatsApp: +86 18838072829and 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 ...
WhatsApp: +86 18838072829Moreover, 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 ...
WhatsApp: +86 18838072829A 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 ...
WhatsApp: +86 18838072829When 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.
WhatsApp: +86 18838072829The 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 foaming 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 foam properties by ...
WhatsApp: +86 18838072829Coal 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
WhatsApp: +86 18838072829If you'd like, you can mix a little cocoa powder into the vegetable oil to make it show up better and look more like crude oil. Fill the bowl with water to an inch or two below the rim. Place it on a table, and have everyone crowd around it. Pour a little oil on the water. Now, watch what happens. The oil, even a little drop, will spread out ...
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