EFFECT OF PYRITIC SULFUR AND MINERAL HATTER ON ORGANIC SULFUR REMOVAL FROM COAL

1993 ◽  
Vol 11 (7) ◽  
pp. 923-936 ◽  
Author(s):  
Padmakar Vishnubhatt ◽  
Theodore Thome ◽  
Sunggyu Lee#
Keyword(s):  
Sulfur Removal ◽  
Organic Sulfur ◽  
Pyritic Sulfur

Desulfurization of Lignite and Coal Using Alkaline Solution from Biomass Ashes

2002 ◽  
Vol 20 (5) ◽  
pp. 371-378 ◽  
Author(s):  
Ayhan Demirbaş
Keyword(s):  
Alkaline Solution ◽  
Soluble Fraction ◽  
Sulfur Removal ◽  
Water Soluble ◽  
Organic Sulfur ◽  
Effect Of Temperature ◽  
Biomass Ash ◽  
Technical Potential ◽  
Pyritic Sulfur ◽  
Biomass Ashes

This study has shown the technical potential of biomass ash to contribute to the desulfurization of problematic high sulfur lignites. The alkaline desulfurization is more effective in removing the pyritic sulfur from the coal, which is the less abundant form than the organic sulfur. Lignite and coal samples from Turkish resources were extracted with an aqueous alkaline solution obtained from the water-soluble fraction of biomass ash. By this method, high sulfur removal from lignites was possible. The effect of temperature, the amount of biomass ash used, extraction time, and stirring speed were studied in the range of 10–50 g, 350–550 K, 0.042–1.8 MPa, 15–60 min, and 300–600 rpm, respectively. The effect of pyritic and organic sulfur removal were investigated. This process removed 33.1, 35.3 and 37.2 % of total sulfur contents; 52.3, 53.6 and 60.7 % of pyritic sulfur contents; and 4.6, 22.1 and 18.0 % of organic sulfur contents from the lignite samples, respectively.

Microwave Applied in Coal Desulfurization Process

2011 ◽  
Vol 71-78 ◽  
pp. 2122-2126 ◽  
Author(s):  
Jie Mi ◽  
Rui Di Wei
Keyword(s):  
Microwave Irradiation ◽  
Irradiation Time ◽  
Sulfur Removal ◽  
Organic Sulfur ◽  
Xps Analysis ◽  
Peroxyacetic Acid ◽  
Inorganic Sulfur ◽  
Coal Desulfurization ◽  
Desulfurization Process ◽  
Sulfur In Coal

In this paper, the desulfurization of Fangshan coal was carried out by tetrachloroethylene extraction under ultrasonic and microwave irradiation. The GC-MS analysis of the tetrachloroethylene extraction reveals that organic sulfur in coal can be removed by tetrachloroethylene extract under ultrasonic and microwave irradiation. It is found that microwave irradiation time has great effect on organic sulfur removal. With the microwave irradiation time increases, the efficiency of organic sulfur removal increases. The desulphurization yield reaches maximum, 45%, when the time is 30 minutes or more. It can be clearly seen that Fangshan coal was oxidated by peroxyacetic acid under ultrasonic and microwave irradiation. From the XPS analysis of the macerals of the coal, most of the inorganic sulfur and organic sulfur are removed, especially thioether and thioalcohol which can be completely removed. These results suggest that microwave is an effective way to remove sulfur in coal.

Organic sulfur removal from coal by electrolysis in alkaline media

1988 ◽  
Vol 18 (1) ◽  
pp. 25-36 ◽  
Author(s):  
P.G. Wapner ◽  
S.B. Lalvani ◽  
G. Awad
Keyword(s):  
Sulfur Removal ◽  
Alkaline Media ◽  
Organic Sulfur

scholarly journals Study of Coal Microbiocenosis for Development of Biotechnological Method for its Desulfurization

2021 ◽  
Vol 15 (1) ◽  
pp. 74-80
Author(s):  
Iryna Blayda ◽  
◽  
Tetyana Vasylieva ◽  
Nataliia Vasylieva ◽  
Valentyna Khytrych ◽  
...  
Keyword(s):  
Heterotrophic Bacteria ◽  
Sulfur Removal ◽  
Organic Sulfur ◽  
Full Potential ◽  
Microscopic Fungi ◽  
Silicate Bacteria ◽  
Bacillus Genus

A presence of microscopic fungi, heterotrophic bacteria, as well as neutrophilic and acidophilic chemolitotrophic bacteria was determined in coal microbiocenosis. The largest and most active towards pyrite sulfur removal is the Acidithiobacillus genus. Heterotrophic bacteria have the biggest potential when it comes to removal of organic sulfur. Preceding treatment of coal with “silicate” bacteria from the Bacillus genus will allow to use coal microbiocenosis for its biodesulfurisation at its full potential.

scholarly journals Comparison Analysis of Coal Biodesulfurization and Coal’s Pyrite Bioleaching withAcidithiobacillus ferrooxidans

2013 ◽  
Vol 2013 ◽  
pp. 1-9 ◽  
Author(s):  
Fen-Fen Hong ◽  
Huan He ◽  
Jin-Yan Liu ◽  
Xiu-Xiang Tao ◽  
Lei Zheng ◽  
...  
Keyword(s):  
Acidithiobacillus Ferrooxidans ◽  
Elemental Sulfur ◽  
Removal Rate ◽  
Sulfur Removal ◽  
Total Sulfur ◽  
Comparison Analysis ◽  
Sem Micrographs ◽  
Residual Coal ◽  
Pyritic Sulfur

Acidithiobacillus ferrooxidans(A. ferrooxidans) was applied in coal biodesulfurization and coal’s pyrite bioleaching. The result showed thatA. ferrooxidanshad significantly promoted the biodesulfurization of coal and bioleaching of coal’s pyrite. After 16 days of processing, the total sulfur removal rate of coal was 50.6%, and among them the removal of pyritic sulfur was up to 69.9%. On the contrary, after 12 days of processing, the coal’s pyrite bioleaching rate was 72.0%. SEM micrographs showed that the major pyrite forms in coal were massive and veinlets. It seems that the bacteria took priority to remove the massive pyrite. The sulfur relative contents analysis from XANES showed that the elemental sulfur (28.32%) and jarosite (18.99%) were accumulated in the biotreated residual coal. However, XRD and XANES spectra of residual pyrite indicated that the sulfur components were mainly composed of pyrite (49.34%) and elemental sulfur (50.72%) but no other sulfur contents were detected. Based on the present results, we speculated that the pyrite forms in coal might affect sulfur biooxidation process.

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