Beneficiation of coal using supercritical water and carbon dioxide
The coal beneficiation is demonstrated in 200–400 °C range at 143 bar using a semi-continuous process without needing any mineral acid or organic solvents by studying the sulfur removal. Carbon dioxide extraction at 350 °C is effective similar to the typical hydrothermal extraction which was most effective at 290 °C.
Feasibility of using ultrasound-assisted process for sulfur and ash
Using new generation technologies like ultrasonic waves in the sulfur removal increases the process effi ciency of physical coal cleaning processes and/or ensure equipment savings (Angle et al ...
Process for removal of sulfur and ash from coal
Patent: Process for removal of sulfur and ash from coal Process for removal of sulfur and ash from coal. Full Record
Sulfur Removal from Coal with The Basic Extraction Liquid of …
Sulfur Removal from Coal with The Basic Extraction Liquid of Oak Ash. December 2021. Journal of the Institute of Science and Technology 11 (4):2613-2620. …
SH Radical: The Key Intermediate in Sulfur Transformation …
To uncouple the complex behavior of sulfur transformation during thermal processing of coal and to elucidate the main mechanism, typical organic and inorganic sulfur compounds impregnated on or mixed with a low-ash char are studied through temperature-programmed decomposi tion coupled with online mass spectrum analysis …
Exploration of the Combined Action Mechanism of …
The combined effect of desulfurization and ash removal in the process of coal desulfurization by microwave with peroxyacetic acid was determined by evaluating …
Process for removal of sulfur and ash from coal
A process for reducing the sulfur and ash content of coal particles wherein coal particles are treated in an aqueous slurry with a minor amount of hydrocarbon oil to form coal-oil aggregates having mo ... Process for removal of sulfur and ash from coal . United States Patent 4272250 . Abstract: ...
Research progress on petroleum coke for mercury removal from coal-fired
The sulfur transformation process in the pyrolysis of petroleum coke might be thiophene sulfur → COS, C 2 S, or CNS → HS → SO 2 or CS 2, where thiophene sulfur is the main sulfur form on the surface. Pyrolysis treatment can promote the mercury removal rate to a certain extent with limited improvement effect (below 60%) than that of …
Removal of Sulfur and Ash from Coal Using Molten Caustic Leaching, a
The best removal of ash was observed by using 1 M bortrifluorid (BF3) solution at 250°C and 70 atm. Depending on the leaching conditions and coal used, reductions ranged from 5% to 36% in sulfur ...
Process for removal of sulfur and ash from coal
A process for reducing the sulfur and ash content of coal wherein coal particles are treated with a conditioning agent in an aqueous slurry prior to agglomeration with a minor amount of hydrocarbon oi ... Process for removal of sulfur and ash from coal . United States Patent 4261699 . Abstract: ...
11.10 Coal Cleaning
Coal cleaning is a process by which impurities such as sulfur, ash, and rock are removed from coal to upgrade its value. Coal cleaning processes are categorized as either …
(PDF) An Overview of the Development of Chemical …
During the desulfurization of high-sulfur Indian coal, the influence of potassium hydroxide. (KOH) and reaction time on coal characteristics was studied. A KOH concentration of 5-20% and. 6-24 ...
Sono-Processing of Coal for Removal of Ash and Other …
Hence, removal of these impurities—ash, sulfur, alkalis—prior to coal burning would be highly beneficial to power plant operations. In this paper, ultrasonic and megasonic …
Feasibility of using ultrasound-assisted process for sulfur and …
In a previous study, sulfur and ash removal from typical high-sulfur Northeast Indian coals [17,18] and Brazilian power coals by using low-power (20 kHz) …
Reduction of Sulfur and Ash from Tabas Coal by Froth …
The conventional froth flotation method is applied to the coal for three aims: (1) to obtain a product with low sulfur and ash content by recovery of the coal in slime, (2) to diminish pollution of the environment by cleaning the process water, which is called black water and is removed from the coal preparations plant and (3) to produce coking ...
How to Remove Sulphur from Coal
The combination gravity and flotation methods demonstrate the technical feasibility of processing fine size coal to effectively remove sulfur and ash to recover …
Process for removal of sulfur and ash from coal
US4261699A US06/032,585 US3258579A US4261699A US 4261699 A US4261699 A US 4261699A US 3258579 A US3258579 A US 3258579A US 4261699 A US4261699 A US 4261699A Authority US United St
Speciation and thermal transformation of sulfur forms in high-sulfur
For the coal pyrolysis process, unstable sulfur compounds will decompose, generate sulfur radicals and release as sulfur-containing gases, this becomes the main pathway for sulfur removal. Coal properties, minerals and sulfur forms in coal, and pyrolysis conditions such as temperature, atmosphere, and the mass transfer, are the …
Removal of sulfur and ash from coal using molten …
demineralization and desulfurization increased with the increase in alkali/coal ratio. The removal of total sulfur and ash increases with increasing leaching temperature and time. As a result of MCL, ash content of Hazro coal was reduced from 18.31 to 6.77 %, and 70% of combustible was recovered. Total
Removal of sulfur dioxide using absorbent synthesized from coal fly ash
Removal of SO 2 from flue gas by the absorbent synthesized from coal fly ash and calcium oxide was studied under different reaction conditions to elucidate the effect of the coexistence of NO and O 2 in the flue gas. The presence of O 2 and NO in the flue gas was found to be necessary to produce sulfate (SO 4 2-) salts instead of sulfite (SO 3 …
Selective sulfur removal from semi-dry flue gas desulfurization coal
Sulfite removal from high-sulfur coal fly ash is rapid and selective in acidic pH. ... As such, we propose a combined process of sulfur removal and carbon dioxide capture illustrated in Fig. 4. This process is a two-stage absorption-washing process, where the first stage involves the absorption of carbon dioxide from flue gas into FGD …
Desulfurization of high sulfur fine coal using a novel …
The removal of sulfur from coal has ... ABSTRACT This study focused on the separation performance of a typical high-ash coal with high-mud content in the enhanced gravity field from the viewpoint of desliming. ... the underground coal-mining industry has increased the volume of fine size coal and waste (refuse) in the mined …
Process for removal of sulfur and ash from coal
A process for reducing the sulfur and ash content of coal wherein coal particles are treated in an aqueous slurry with a minor amount of hydrocarbon oil to form coal-oil aggregates. The coal-oil aggregates are separated from ash and mineral matter in the slurry by dissolved gas flotation. Optionally, the coal particles may be treated with a …
Mechanism for Removal of Organic Sulfur from Guiding Subbituminous Coal
Ash in Guiding subbituminous coal (GSBC) was removed by treatment with dilute acids. The treated GSBC (TGSBC) was extracted with isopropanol (IP) to afford IP-extractable fraction (IPEF). TGSBC was sequentially extracted with petroleum ether, carbon disulfide, acetone, and methanol. Octane-1-thiol and thiophene were selected as model …
Coal
The miners use large machines to dig out the coal. Processing coal. After removing the coal from the ground, the miners may send it to a preparation plant near the mining site. The plant cleans and processes coal to remove rocks, dirt, ash, sulfur, and other unwanted materials. This process increases the heating value of the coal.
Coal Processing | Coal Preparation | Coal Handling | RPM …
The cleaning removes impurities like rock, ash, sulfur and other substances. A high amount of rock and clay particles reduces the quality and heating value of coal and usually means a lower price for coal. Some coal is crushed and mixed with water and transported through pipelines. Coal processing involves crushing, screening and beneficiation.
Process for removal of sulfur and ash from coal
A process for reducing the sulfur and ash content of coal comprising: treating coal particles in a hydrocarbon oil slurry with minor amounts of a conditioning agent and water to effect agglomeration of ash and pyritic sulfur mineral matter; separating the agglomerates from the slurried coal particles; and recovering coal particles from the hydrocarbon oil.
Removal of Sulfur and Ash from Coal Using Molten Caustic …
The removal of total sulfur and ash increases with increasing leaching temperature and time. As a result of MCL, ash content of Hazro coal was reduced from 18.31 to 6.77 %, and 70% of combustible was recovered. ... Effects of alkali treatment on ash and sulfur removal from Assam coal. Fuel Processing Technology 85, 93 ...
Process for removal of sulfur and ash from coal
A process for reducing the sulfur and ash content of coal wherein coal particles are treated in a aqueous slurry with a minor amount of hydrocarbon oil to form coal-oil aggregates of enlarged effective particle size and the coal-oil aggregates are then separated from ash and mineral matter in the slurry. Optionally, the coal particles are …
Removal of Sulfur and Ash from Coal Using Molten Caustic …
Molten caustic leaching process is effective in reducing significant amount of ash derived from minerals, pyritic sulfur, and organic sulfur from coal. The effect of …