(PDF) Production of Ethylene Glycol from Coal
Y.-H. Sun. H. Yan. In recent years, the modern coal chemical industry in China develops rapidly. A number of industrial demonstration project such as coal direct liquefaction, coal indirect ...Web
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Coal Preparation Technology: Status and Development in China
Wenfeng Wang, Yong Qin, Migrating Behavior of Deleterious Elements and Minerals During Coal Cleaning Process, Xuzhou: China University of Mining Press, 2011. ... Chinese National Engineering Research Center of Coal Preparation and Purification, Xuzhou 221116, Jiangsu, China [email protected] View all articles by this author.Web
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Study on Solvent Extraction of Rare Earth Elements from …
Firstly, REE are transferred from the solid phase to the liquid phase by means of acid addition (after calcination). Generally, acid leaching is used for REE recovery from coal-based resources [25,26,27,28,29]. Afterward, a purification process is applied for the separation of the target product and impurities.Web
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Coal purification and electrode formation
A process for purification of coal comprises forming an aqueous leaching solution containing nitric and hydrofluric acid. Impurities are removed by contacting coal having a mesh size not greater than 8 (Tyler Series) with the leaching solution for a period of 15 to 120 minutes at a temperature of 20° to 100° C. During the contacting of coal ...Web
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Gold processing
Gold processing - Refining, Smelting, Purifying: Gold extracted by amalgamation or cyanidation contains a variety of impurities, including zinc, copper, silver, and iron. Two methods are commonly employed for purification: the Miller process and the Wohlwill process. The Miller process is based on the fact that virtually all the impurities present …Web
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Coal Preparation Plant | Coal Preparation Process | Coal Washing
What is Coal Preparation Plant. Coal preparation plant is a coal processing plant that include a series of processes: raw coal screening, crushing, coal washing, separation, clean coal dewatering and slime recycling. Which can separate coal from impurities, remove mineral impurities from raw coal and divide it into different specifications of ...Web
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Novel coal-to-methanol process with near-zero carbon emission
For coal-based methanol production, coal is intermingled with O 2 of AS and subsequently subjected to CG for producing crude syngas. The cryogenic separation technology is primarily used in the AS for oxygen production, which is a high energy consumption process (Xiang et al., 2014).Because of the small hydrogen-to-carbon …Web
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12.3. Types of Coal-derived Chemicals | netl.doe.gov
The Eastman coal-to-chemicals plant at Kingsport uses cryogenic purification for CO/hydrogen (H 2) separation. Figure 1: Gasification/Syngas Chemical Routes In the cryogenic CO/H 2 purification scheme, syngas feed is first pre-treated with molecular sieves to remove carbon dioxide (CO 2 ) and water before being chilled to approximately …Web
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Coal-to-liquids and polygeneration using low rank coals
The H-COAL process was developed by HRI Company from the fluidized-bed heavy oil hydrocracking process (H-Oil). ... Therefore, coal gas purification is one of the key technologies of coal gasification. The two main parts of coal gas purification are the dust removal and desulfurization. At present, the equipment that can effectively remove …Web
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Clean Coal Technology
Clean Coal Technology. Clean coal technologies (CCTs) are a new generation of advanced coal utilization processes that are designed to enhance both the efficiency and the …Web
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What is clean coal technology? | HowStuffWorks
Coal is a fossil fuel composed primarily of carbons and hydrocarbons. Its ingredients help make plastics, tar and fertilizers.A coal derivative called coke melts iron ore and reduces it to create steel.But most coal — 92 percent of the U.S. supply — goes into power production [source: Energy Information Administration].Electric companies and …Web
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Dry syngas purification process for coal gas produced in oxy-fuel …
Oxy-fuel IGCC power generation plant is basically comprised of conventional technologies; oxygen (O 2)-blown coal gasifier, syngas purification process, semi-closed gas turbine, heat recovery steam generator, steam turbine, steam condenser, and compressors (Kobayashi and Akiho, 2016).Web
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Research Progress on Volatile Organic Compounds Emissions from Coal
Known as the high-priority air pollutants in the atmosphere, volatile organic compounds (VOCs) are a dominated precursor of secondary organic aerosols (SOAs), leading to complex PM2.5 and O3 pollution and severe risks to human health. Considering upward concentrations of VOCs emitted from a great number of coal-fired power plants …Web
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A holistic life cycle evaluation of coking production covering coke
After purification process, COG can be used for more-energy fuels and chemical products, and a series of other byproducts (i.e., coal tar, sulfur, ammonia sulfate and crude benzene) are recovered successively. Integration of coking production system with COG purification process has been applied to enhance the energy efficiency and …Web
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Coal Mining and Processing Methods
In surface mining, the ground covering the coal seam (the overburden) is first removed to expose the coal seam for extraction. The elements of a surface mining operation are (1) …Web
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Coal Gasification : All you need to know about
Coal Gasification is the process of converting coal into synthetic gas (syngas) which is a mixture of hydrogen (H2), Carbon Monoxide (CO), and Carbon dioxide (CO2). It is an in situ process in which oxygen is injected into the seam along with water and ignited at a high temperature, which causes the coal to partially oxidize into …Web
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Special issue on coal gasification: science and technology
Through this process, coal as a fuel can be extracted in a gas phase, which is known as synthesis gas or syngas. The sixth paper focused on the investigation of thermochemical behavior, with the measured thermal and gas products and how they are influenced by the alternation of the UCG process's operating and boundary conditions.Web
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Changes in properties of tar obtained during underground coal
The gasification process was started by igniting a coal seam using a pyrotechnic charge. The ignition occurred with low oxygen flow rate (2 Nm 3 /h) supplied into the reactor inlet. After ignition of the coal, the oxygen flow rate was increased to 10 Nm 3 /h. The process initiation was considered complete when the concentration of oxygen in the …Web
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Development of new technology for coal gasification purification …
Coal-fired power generation is the main source of CO 2 emission in China. To solve the problems of declined efficiency and increased costs caused by CO 2 capture in coal-fired power systems, an integrated gasification fuel cell (IGFC) power generation technology was developed. The interaction mechanisms among coal gasification and …Web
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Processing to obtain high-purity gallium | JOM
Aside from ore, gallium can be obtained from such industrial sources as the Bayer process caustic liquor that is a byproduct of bauxite processing, flue dust removed from the fume-collection system in plants that produce aluminum by the electrolytic process, zinc refinery residues, gallium scrap materials, and coal fly ash. The purification ...Web
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Recovery of High Purity Rare Earth Elements (REE) from Coal …
@article{osti_1631038, title = {Recovery of High Purity Rare Earth Elements (REE) from Coal Ash via a Novel Electrowinning Process (Final Report)}, author = {Argumedo, Darwin and Johnson, Kathryn and Heinrichs, Mike and Peterson, Rick and Winburn, Ryan and Brewer, Joseph}, abstractNote = {The goal of this project was to …Web
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Clean Coal Technologies | Carbon Capture and Storage | CCS
The term 'clean coal' is increasingly being used for supercritical coal ... a monoethanolamine process which yields high-purity carbon dioxide, amine scrubbing, and membrane processes. ... 2 project involves oxy-combustion. Such a plant has an air separation unit, a boiler island, and a compression and purification unit for final flue gas. …Web
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Coke oven gas: Availability, properties, purification, and utilization
Coke oven gas (COG), sometimes simply called "coke gas," is a by-product of the coke-making process, where volatile coal matter is generated as COG, leaving carbon intensive coke behind. ... The optimization of the industrial COG purification process has become highly significant in achieving an efficient, economical, and eco-friendly ...Web
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A holistic life cycle evaluation of coking production covering coke
In addition, COG purification process is the main contributor to VOC emissions, accounted for 34.93%, followed by coke-making process and coal mining. As a whole, COG purification process contributes higher environmental burdens to all the selected air emissions except for CH 4 and NO x than those in coke-making process …Web
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An improved tar–water separation process of low–rank coal …
Therefore, a large part of low-rank coal is unsuitable for conversion and utilization by coal water slurry gasification and powder coal gasification. Only process routes, such as pyrolysis, Lurgi fixed bed gasification, and British Gas/Lurgi gasification, in which low-rank coal is first pyrolyzed into tar, gas, and semi–coke at low and medium ...Web
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A Comprehensive Review of Rare Earth Elements Recovery from Coal …
A schematic diagram incorporating the use of the alkali-acid leaching process to extract REEs from coal and coal refuse is shown in Figure 1. A negative aspect of the alkali leaching step is the considerable amount of contaminants dissolved into solution along with the REEs, which complicates the downstream purification process.Web
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New process developed to extract high purity rare earth element …
Penn State's Center for Critical Minerals has developed a new purification process that extracts mixed rare earth oxides from acid mine drainage and associated sludges at purities of 88.5%. Critical minerals (CMs), including the 17 rare earth elements (REEs), are used in many common products like smartphones and …Web
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CO2 purification. Part II: Techno-economic evaluation of oxygen …
The evaluated technologies succeeded in achieving the targeted purification levels but with high investment costs and major operational costs. The coal-fired full purification process was shown to have a total cost of $13.09/ton CO 2 and that of the NGCC process to be $17.23/ton CO 2.Web
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Chemistry and geology of coal: nature, composition, coking
Coal geology concerns major eras of coal formation as well as the processes of peatification, coalification and the chemical processes of coalification, coal types and …Web
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