WEBThis paper presents the results of an investigation of energy requirements for grinding of coalwater slurries in conventional and high speed stirred ball mills. The high speed stirred ball mill, featuring a rotorstator type of stirring device, has been found to outperform a tumbling ball mill for wet grinding of minus 12 mesh coal to a fineness meeting the .
WEBMay 1, 2011 · Coal–Water Slurry (CWS) technology was developed during the world wide oil crisis of the 1970's to produce a novel and clean fluid fuel as a substitute for petroleum. The slurry is prepared as a mixture of 62–70% fine coal, 29–37% water, and about 1% additives determined specifically for each different process [1].
WEBJul 5, 2023 · The regasifiion of coal water slurry produced from gasifiion wastewater meets the requirements of clean and efficient use of energy and the concept of circular economy. In this paper, the slurryability of coal water slurry prepared with gasifiion wastewater was measured, and the influence mechanism of organic matter, metal ions, .
WEBApr 1, 2023 · Coal water slurry (CWS), as effective utilization of coal, had attracted extensive attention. CWS, a kind of coalbased fluid fuel obtained by physical processing, consists of about 65 wt% coal, 34 wt% water and 1 wt% dispersant. ... As known, fine chemicals have high valueadded. If biooil could be converted into fine chemicals, no .
WEBCoblending of coalwater slurry with slag reduced the contact angle of the sample. Chang et al. (Chang, 2019) proposed a CGFS ultrafine grinding threepeaklevel slurry preparation process, where the maximum addition ratio of CGFS can be up to 5% under the premise of coal slurry concentration not less than 65%. It was determined that CGFS ...
WEBSep 25, 2023 · Utilization of finegrained gangue slurry in coal mine filling. The above research has verified that the finegrained gangue slurry can diffuse long in the caving zone, and the diffusion distance is up to 8 ~ 36 m (Ma et al. 2022a; Ma et al. 2022b; Ma et al. 2022c). Based on the research results, the fluidization filling method of gangue is ...
WEBJan 15, 2004 · The additive concentration was held constant at wt.% in each case. The coal loading (ball mill dry product of Ledo coal) was varied from a minimum of 56 wt.% to a maximum of 70 wt.% and the viscosity data were recorded. Fig. 1 summarises the effect of solids content of CWS on the apparent viscosity at 128 s −1 for the additives P and R ...
WEBFeb 1, 2014 · The coal powder was slowly mixed in a pot containing a certain known quantity of dispersant and deionized water. The contents were continuously stirred by a mixer during the addition of coal, and then the stirring of the slurry was continued for another 10 min at 1200 rpm to ensure the homogenization of slurry so .
WEBJan 25, 2011 · The rheological properties of coal–oil–water suspension containing solids of different sizes, the effect of coal particle size distributions on rheology of coal–water slurries (CWS) was studied [7], [8] and some previous work with respect to slurry rheology in ultrafine grinding was reviewed [9].
WEBMar 15, 2011 · The dualpolymer flocculation was also used in case of fine coal slurries and coal tailings. Tao et al. investigated the effect of combined use of flocculants on vacuum filtration [3]. The anionic flocculant Percol 156 was added into the clean coal froth slurry prior to the ionic flocculant Percol 371.
WEBNov 12, 2021 · Typical products consist of ash below 16% and a calorific value of at least 27Mj/kg. Moisture plays a major role in the fine coal market and the water recovered from the product is immediately reused for processing. Grain sizes of up to 5mm can be processed, while unit sizes of up to 150t/h can be built.
WEBJun 15, 2022 · 1. Introduction. Coal water slurry (CWS) is a kind of coalbased liquid fuel, which is an efficient and clean way to utilize coal, and also can reduce the emission of NO x and SO 2. Recently biomass, sludge and petrochemical are added into CWS to make it greener and treat the solid wastes during gasifiion process [1].At present, the .
WEBDOI: / Corpus ID: ; Distribution and modes of occurrence of heavy metals in opposed multiburner coalwaterslurry gasifiion plants article{Jiang2021DistributionAM, title={Distribution and modes of occurrence of heavy metals in opposed multiburner coalwaterslurry gasifiion plants}, author={Peng .
WEBJan 1, 2024 · Tao et al. [15] found that the flotation recovery of fine coal increased by 10–30% in the presence of nanobubbles. Fan et al. [16], Rubio research group [17], [18], Feng Qiming et al. [19]and Liu et al. [20] reported that flotation performance of coal/minerals was improved by bulk nanobubbles generated with a venturitype .
WEBAug 13, 2021 · The present paper is a part of the study done on settling of coal fines by flocculation to enhance the clarifiion efficiency, such that the process water could be recycled in coal washing circuits. In this study, flocculation performance results of the tests carried out using two polymer flocculants, namely Nalco83370+ and Magna1011, .
WEBFeb 15, 2024 · CWS could be seen as a suspension made of fine coal–water slurry and dispersed coarse coal particles. Fine particles filled the gaps between coarse particles and surrounded them to form an aggregated structure. The schematic diagram for the arrangement of coal particles in CWS suspension is shown in Fig. 2. Download : .
WEBSep 1, 2018 · To improve the efficiency of the gasifiion or combustion process of coal water slurry (CWS), it is significant to optimize the rheological properties and increase the solid concentration of CWS. . Expand. 15 [PDF] Save. Recent developments in beneficiation of fine and ultrafine coal review paper. M. Ramudzwagi N. Tshiongo .
WEBNov 15, 2022 · Municipal 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 .
WEBFeb 1, 2020 · In the field of coalwater slurry gasifiion, the gasifiers play a critical role in using coal resources in an efficient and clean way. The gasifiion process relies on the reactions between coal, water and oxygen in the gasifiers operated under a pressure as high as 2– MPa and a hightemperature between 1300–1600 °C [ 6, 18 ].
WEBDec 14, 2023 · This coal water slurry is mainly used in the boiler combustion process [2] and in the gasifiion of coal [3], [4]. Coal water slurry is a composition of solid particles in combination with water and 1 % additive by weight [5], [6], [7]. In the presence of various additives, the coal concentration stability of the slurry increases.
WEBDec 4, 2009 · The costs of preparation and burning of coal slurries, in particular, coalwater fuel (CWF), considerably exceed the cost of coal utilization according to the conventional technology. CWF technology projects suggest that additional expenditures will be compensated for by the profitability of their pipeline transport in the laminar regime. .
WEBAug 31, 2023 · From Fig. 4, it can be seen that the cylinder compressive strength of coral aggregate enhanced by ultrafine cement slurry is improved in different degrees after immersion. When the waterslurry ratio was, the enhanced coral aggregate after 28 days of curing increased by about % compared with the ordinary coral aggregate.
WEBJan 1, 2005 · A typical CWS consists of 60–75% coal, 25–40% water and about 1% chemical additives [1], [2], [3]. The most important rheological characteristic of coalwater slurry is its viscosity. It is desirable that particular coalwater slurry has a high pulp solids percent and a low viscosity value [1], [4].
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