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 ...
This study investigated if whole wheat flourbased cookie dough's physical properties were affected by mixing time (1 to 10 min). The cookie dough quality was assessed using texture (spreadability and stress relaxation), moisture content, and impedance analysis. The distributed components were better organized in dough mixed for 3 min when compared with the other times. The segmentation ...
The 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.
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%.
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 ...
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 ...
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 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.
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 ...
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 ...
The coal pitch water slurry was prepared by coal pitch powder, dispersants and two different kinds of coking wastewater. The apparent viscosity, rheological behavior and stability of the coal pitch water slurry were investigated. The results indicated that both the two kinds of coking wastewater could be used to prepare coal pitch water slurry. Moreover, the adsorption of dispersants and zeta ...
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 ...
The attraction of the coalwater slurry is its complete independence of an oil supply; coaloil mixtures are effectively a means of extending oil supplies and are less economically beneficial. Coalwater slurry is simply produced by mixing pulverised coal with water together with a small amount of a surfactant and a stabilizing agent.
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.
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 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 ...
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 ...
If 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 ...
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 ...
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 ...
A 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.
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.
The 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 ...
The mixed collector can improve low rank coal flotation efficiency, but its synergistic mechanism needs to be further explored. In this paper, oleic aciddodecane (OAD), oleic acid (OA), and dodecane (D) were employed to treat the low rank coal for revealing new synergistic mechanism of the mixed collector. First the surface free energy of the coal, the surface free energy of coalwater and ...
The 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 ...
The coal is transferred from the mixing bins to the coal crusher where it is pulverized to a preselected size between and mm ( and in.). ... The pulverized coal is then mixed and blended, and sometimes water and oil are added to control the bulk density of the mixture. The prepared coal mixture is transported to the coal ...
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 ...
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 ...
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 ...
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 ...
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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