scholarly journals SYNGAS DERIVED FROM CATALYTIC GASIFICATION OF FINE COAL WASTE USING INDONESIAN POTENTIAL CATALYST

2021 ◽  
pp. 1-8
Author(s):  
Muhammad Faizal ◽  
Nabila Aprianti ◽  
Muhammad Said ◽  
Subriyer Nasir
Keyword(s):  
Clean Energy ◽  
Raw Material ◽  
Feed Ratio ◽  
Coal Waste ◽  
Gas Composition ◽  
Catalytic Gasification ◽  
Heating Value ◽  
Fine Coal ◽  
Gasification Process ◽  
Gasification Efficiency

Fine coal waste from the coal mining process has not been used as clean energy even though the amount is very abundant in the world. The conversion of fine coal to syngas is a new way to increase the value of fine coal. Syngas composition, gas ratio, gasification efficiency, and heating value of syngas have been determined under various conditions of temperature (550-750 °C) and bentonite catalyst ratio (0-0.25). The results indicate that fine coal is the suitable raw material for the gasification process. At the highest temperature (750 °C), the gas composition consists of 42.6 vol% H2, 19.1vol% CO, 19.5 vol% CH4, and 7.9vol% CO2. The best performance was achieved when the catalyst/feed ratio is 0.25 with the gas composition of 54.3vol% H2, 26.2vol% CO, 23.8 vol% CH4, and 3.5vol% CO2, heating value and gasification efficiency were 19.72 MJ/Nm3 and 72.27% at 750 °C.

scholarly journals Recovery of Fine Coal Grains from Post-Mining Wastes with Use of Autogenous Suspending Bed Technology

2020 ◽  
Vol 28 (4) ◽  
pp. 220-227
Author(s):  
Daniel Kowol ◽  
Haldun Kurama
Keyword(s):  
Grain Size ◽  
Ash Content ◽  
Mining Waste ◽  
Mineral Deposits ◽  
Coal Waste ◽  
Mining Wastes ◽  
Test Results ◽  
Waste Dump ◽  
Secondary Mineral ◽  
Fine Coal

AbstractIn addition to rock waste post-mining waste dump sites also contain coal grains justifying treating the dump sites as secondary mineral deposits. The article presents the results of laboratory tests aimed at determining the possibility of using suspending bed technology to separate a combustible substance from post-mining waste of a 4-0 mm grain size. The test results showed the possibility of obtaining good quality coal concentrates from coal waste of a grain size of 4-1 mm. The need for desludging and densifying the feed for the classifier with an autogenic suspending bed in the case of coal waste beneficiation in a wide 4-0 mm grain size justifies the use of a two-chamber device or two separate classifiers for narrower grain size classes. Concepts of systems for the recovery of fine coal grains providing the use of the classifier with autogenous suspending bed for the density distribution of feeds with high ash content are presented. The concepts were developed for beneficiation of the material in a 4-0 mm grain class.

Utilization of Fine Coal Waste as a Fuel Briquettes

2013 ◽  
Vol 33 (4) ◽  
pp. 194-204 ◽  
Author(s):  
Gabriel Borowski ◽  
Jan J. Hycnar
Keyword(s):  
Coal Waste ◽  
Fine Coal

scholarly journals Algal Lipids as Biocollector for Recovery of Coal from Fine Coal Waste by Froth Flotation

Minerals ◽  
2020 ◽  
Vol 10 (1) ◽  
pp. 70
Author(s):  
Kudzai G. Chiodza ◽  
Susan T. L. Harrison ◽  
Marijke A. Fagan-Endres
Keyword(s):  
Oleic Acid ◽  
South African ◽  
Fatty Acid Methyl Esters ◽  
Methyl Esters ◽  
Froth Flotation ◽  
Optimum Operating ◽  
Coal Waste ◽  
Fine Coal ◽  
Acid Methyl ◽  
Better Than

Raw algal lipids (RALs) and their derivatives (fatty acid methyl esters; FAMEs) were investigated as biocollectors for the recovery of coal from ash-rich fine coal waste by froth flotation. Testing was done on fine coal discards from two South African sites—a high ash (50%), high sulphur (5.7%) sample and a lower ash (26%), low sulphur (0.91%) sample. The yield and recovery of combustibles on using biocollectors was similar to, or better than, with oleic acid, a polar collector demonstrated as a good collector in previous research. The RALs and FAMEs reduced the ash and sulphur content of the combustible fraction of the high ash-high sulphur sample to between 23–28% and 1.9–3.3%, respectively. The chemical modification of RALs to FAMEs provided potential for improving the selectivity of the recovery of combustibles. It also resulted in a change of the optimum operating pH, with RALs yielding better results at the natural pH of the sample (pH 2.7), while FAMEs performed best at pH 7.

scholarly journals Deep processing of organic mass of finely dispersed coal waste

2021 ◽  
Vol 315 ◽  
pp. 02014
Author(s):  
Vasilii Murko ◽  
Marina Baranova ◽  
Irina Grishina
Keyword(s):  
Organic Liquid ◽  
Motor Fuel ◽  
Coal Waste ◽  
Deep Processing ◽  
Organic Mass ◽  
Organic Part ◽  
Secondary Use ◽  
Fine Coal ◽  
Liquefaction Process ◽  
Effective Use

The technological and technical possibility of deep processing of coal by its liquefaction using the methods of extreme mechanochemical and physical effects has been determined; recommendations have been developed for the applied use of the obtained materials in heat power engineering. The organic part of the solid mass of the prepared coal-oil suspension, which has turned into a relatively heavy organic liquid, can be used as a boiler or motor fuel, as well as a feedstock for the production of various hydrocarbon liquids. The resulting mixture of hydrocarbons can be subjected to rectification to obtain hydrocarbon fractions for the production of plastics, oil fractions and the entire spectrum of hydrocarbons for secondary use. The effective use of the above substances will make it possible to obtain not only economic, but also a significant environmental effect. The possibility of liquefying the organic mass of coal using decalin as a hydrogen donor is shown. It was found that the addition of 3% decalin improves the liquefaction process during cavitation treatment. Liquefaction of the organic mass of coal is accompanied by the splitting of the structures of macromolecules of organic substances of coal into aromatic fragments with a lower molecular weight. It should be noted that the developed technology will solve the problem of increasing the value of the final coal product, including by involving unused fine coal sludge into circulation.

Methods of Increasing the Calorific Value of Fine Coal Waste

2016 ◽  
pp. 409-414 ◽  
Author(s):  
Jan J. Hycnar ◽  
Piotr Pasiowiec ◽  
Barbara Tora
Keyword(s):  
Calorific Value ◽  
Coal Waste ◽  
Fine Coal
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