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Coal gasification fine slag (CGFS) is a solid waste byproduct generated during the coal gasification process. However, the high content of residual carbon hinders its potential for resource utilization. The urgent need for an efficient carbon extraction and ash reduction technology is evident. Hydrophobic–hydrophilic separation (HHS) is a …Web
Separation of coal macerals. ☆. The conditions necessary for efficient, small-scale separation of coal macerals are investigated. The method developed takes advantage of known density differences of the various macerais, but unlike most separations, an isopycnic density gradient centrifugation (DGC) technique is used to …Web
Characterization of Middle-Temperature Gasification Coal Tar. Part 3: Molecular Composition of Acidic Compounds. Coal tar has been considered as a potential energy alternative because of dwindling supplies of petroleum. To determine if the coal tar could be refined and upgraded to produce clean transportation….Web
Coal-gangue separation is an essential step in the coal preparation process. However, existing manual selection and mechanical separation methods require a large amount of labor, consume too much water, and involve health hazards. In this article, we solve this problem based on the near-infrared spectroscopy (NIRS) technique in tandem with …Web
Triboelectric separation has been widely used as one of the most vital and promising powder processing technologies for resource recovery. Recently, triboelectric separation technology has been developing continuously, and has been widely applied in the fields of coal cleaning, mineral separation and secondary resource recycling (e.g., …Web
ABSTRACT The separation of coal and gangue is an important aspect of coal production, which can improve coal quality, save energy, reduce consumption, and enable the rational use of resources. At present, manual selection remains widely implemented, but the working environment is harsh, labour intensity is high, and …Web
Triboelectrostatic separation technology is not high for coal GFA carbon content requirements, without adding any chemicals, low investment and operating costs. Additionally, gas is used as a carrier medium that can effectively overcome the agglomeration of fine ash particles, and makes it especially applicable to GFA of small …Web
The separation methods of coal macerals are generally divided into two categories, and chemical methods are less commonly used than physical methods …Web
Conceptual design of the improved oil–water separation. An existing representative coal pyrolysis and oil recovery process is shown in Fig. 13. The thermally decomposed product and moisture enter the crude gas and are condensed during washing and cooling [36]. The condensate, namely, gas liquid, consists mainly of wastewater and …Web
The precise separation of macerals is the premise and foundation for the efficient utilization of coal resources, and flotation is the separation method with the greatest industrial potential. The differences in the surface hydrophobicity of macerals provide the basis for flotation, but the complexity of their surface properties makes ...Web
A modular and efficient dry coal preparation system was established for raw coal preparation, drying, separation, medium purification and recovery, density steady-state control, air supply and dust removal, product transportation and integrated assembly.Web
Coal mining - Extraction, Processing, Pollution: In geologic terms, coal is a sedimentary rock containing a mixture of constituents, mostly of vegetal origin. Vegetal matter is …Web
Unburned coal grains often hinder the economic utilization of fly ash and also represent energy loss of the fuel. This paper addresses the possibility of separating unburned coal from a selected ...Web
Density separation. Raw coal consists of organic and mineral matter components, with specific gravities ranging from 1.30 for the lighter organic material to 2.5 for rock. Coal is cleaned by separating the lower-density organic material from the higher-density refuse. In heavy-media separations, the specific gravity of the medium used for ...Web
A novel online separation system is designed to coal tar separation. Compared with traditional method, it is an energy-saving and environment-friendly utilization. It will get larger amount of light fraction tar, usually more than 50%, which have a higher economic value. In addition, the influence of the pyrolysis temperature of system is also ...Web
The inefficient separation of clean coal by these three techniques was due to the poor liberation of minerals from the tailings coal. It was observed that, the …Web
Splits. Definition: Splits are broadly wedge-shaped rock bodies that cause parts of the seam (benches) above and below the rock wedge to separate or split from each other. Depending on the direction …Web
Nov. 24, 2023, 4:03 AM ET (CNBC) Rare earth discoveries mean coal mines could have a key role to play in the energy transition coal mining, extraction of coal deposits from the surface of Earth and from …Web
Triboelectric separation has been widely used as one of the most vital and promising powder processing technologies for resource recovery. Recently, triboelectric separation technology has been developing continuously, and has been widely applied in the fields of coal cleaning, mineral separation and secondary resource recycling (e.g., …Web
The process of separating particulate materials on the basis of their specific gravities is referred to as gravity separation. The objective of the coal washability principle is to develop routine protocols that include the float-and-sink test, ash analysis, and evaluation of partition curves to obtain maximum possible separation performances for a …Web
At present, the research on the separation of CBM by hydrate method is still in the laboratory stage. The disadvantages of the hydrate separation technology of CBM are that the hydrate formation rate is slow and the separation efficiency is low. In view of the problems faced by this technology, some future research directions are put forward.Web
Different physical separation techniques were employed to check the feasibility of clean coal separation from Coal-A and Coal-B (Fig. 3). Density separation and froth flotation techniques can able to produce clean coal at 16.1–18.4% ash from Coal-A and 16.6–19.2% clean coal from Coal-B, however, clean coal with yield was limited to …Web
A new method of distinguishing coal quality or types and efficiently separating gangue and rock from the production lines of coal preparation plants (CPPs) is proposed by exploiting infrared machine vision and convolutional neural networks for deep learning, which can make coal use less harmful to humans and nature and/or more useful for ...Web
separate the so-called crude phenol from coal tar, which is not sufficiently pure, and the subsequent additional purification is carried out by the above-mentioned extraction method. The article suggests a phenol separation technology that meets GOST 11311-76 "Coal phenol" (government standard) with a basic substance content of at least 99% wt.Web
The technologies for separating methane from CBM include chemical absorption, pressure swing adsorption, membrane separation, low temperature liquefaction, gas injection displacement technology and hydrate-based separation technology [8], [9], [10].When chemical absorption method was used to separate methane, the cost of deoxidation …Web
Coal gangue separation is an essential part of the development and utilization of coal. A method of separating gangue from coal based on the density by calculating volume and weight of the ores ...Web
The separation efficiency of coal samples is represented by the partition curve, which is a plot of partition coefficients against relative density. The partition coefficient is expressed as the fraction of a specific relative …Web
Mohanta et al. (2011, 2012, 2013a, b) had made many efforts to optimize the operational parameters and the feed coal properties in order to achieving an optimum beneficiation performance of an ADMFB separator.It was pointed out that when the feed coal size is below 15 mm, the size effect on sharpness in separation becomes …Web
The separation of fine coal has been widely discussed in the coal preparation industry due to its high economic potential. Dense medium cyclone (DMC) is the most efficient equipment available for fine coal separation. However, the industrial application of DMC is far from satisfactory due to operational difficulties and …Web
The elements of a surface mining operation are (1) topsoil removal and storage for later use, (2) drilling and blasting the strata overlying the coal seam, (3) loading and transporting …Web
The process of pneumatic separation which is based on machine vision is shown in Fig. 1.Firstly, materials of coal and gangue will be sent into the roll-type crusher 3, which will be crushed under 100 mm. Coal particles, which diameter is less than 50 mm, will transport to coal bunker through conveyor belt.Coal and gangue particles, having a …Web
Wet separation processes of coal fly ash include gravity separation, oil agglomeration separation, and froth flotation. Gravity separation methods such as interference bed separation (Blissett, 2013) and air jet hydrocyclone separation (Niewiadomski, 1999) are based on the density difference between carbon and ash …Web
As an important part of the coal industry, coal gangue separation can improve coal quality, save energy, and reduce consumption and thus rationally use resources . At present, coal and gangue separation includes moving sieve jigging method, heavy medium separation, dual-energy γ-ray separation, X-ray, and image recognition method.Web
