Geochemistry of coals in Panian Coalfield, Semirara Island, Philippines

Stella Marris Limos-Martinez, Koichiro Watanabe

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Abstract

Panian coalfield of Semirara Island is the largest producing coal mine in the Philippines and accounts for 93% of the annual domestic coal production. The coals from Panian have consistently shown a high tendency for slagging and fouling despite the relatively low average ash content, and it is the aim of this study to understand why. Thirty one representative samples of seams 22, 32/33 and 42 were analyzed to characterize the geochemistry of the coal seams in Panian coalfield. Proximate analyses and vitrinite reflectance measurements designate the rank of the seams as lignite to sub-bituminous, based on the ASTM coal classification. H/C versus O/C ratios indicate that the seams are made up largely of huminite, denoting early stages of coalification of woody plants. Chemical analysis of the ash reveals high contents of Na, Mg, Fe, Ca, Ba and Sr which show strongly negative correlation with ash yield, denoting organic affinity for the major elements of the seam. Na has shown a tendency to increase its concentration with depth while Mg, Fe, Ca and Sr are observed to diminish. The determined amounts of potentially hazardous trace elements As, Pb, Cr, Cu, Ni, V, Zn, Cl, Ba, Mn, Sr and Th in the seams are within acceptable levels when compared with world-Traded coals. Owing to the enrichment in alkali and alkali-earth elements, slagging and fouling indices indicate that the seam has medium to high propensity for slagging and a severe tendency for fouling. The detrimental characteristics of coal feedstock from Panian mine is mitigated by blending with coals imported from Indonesia, China and Australia.

Original languageEnglish
Title of host publication22nd Annual International Pittsburgh Coal Conference 2005, PCC 2005
Pages2209-2225
Number of pages17
Publication statusPublished - Dec 1 2005
Event22nd Annual International Pittsburgh Coal Conference 2005, PCC 2005 - Pittsburgh, PA, United States
Duration: Sep 12 2005Sep 15 2005

Publication series

Name22nd Annual International Pittsburgh Coal Conference 2005, PCC 2005
Volume3

Other

Other22nd Annual International Pittsburgh Coal Conference 2005, PCC 2005
CountryUnited States
CityPittsburgh, PA
Period9/12/059/15/05

Fingerprint

Geochemistry
Ashes
geochemistry
Coal
coal
fouling
ash
Fouling
coalification
coal production
vitrinite reflectance
woody plant
lignite
coal seam
coal mine
chemical analysis
Reflectometers
Lignite
trace element
Trace elements

All Science Journal Classification (ASJC) codes

  • Geotechnical Engineering and Engineering Geology

Cite this

Limos-Martinez, S. M., & Watanabe, K. (2005). Geochemistry of coals in Panian Coalfield, Semirara Island, Philippines. In 22nd Annual International Pittsburgh Coal Conference 2005, PCC 2005 (pp. 2209-2225). (22nd Annual International Pittsburgh Coal Conference 2005, PCC 2005; Vol. 3).

Geochemistry of coals in Panian Coalfield, Semirara Island, Philippines. / Limos-Martinez, Stella Marris; Watanabe, Koichiro.

22nd Annual International Pittsburgh Coal Conference 2005, PCC 2005. 2005. p. 2209-2225 (22nd Annual International Pittsburgh Coal Conference 2005, PCC 2005; Vol. 3).

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Limos-Martinez, SM & Watanabe, K 2005, Geochemistry of coals in Panian Coalfield, Semirara Island, Philippines. in 22nd Annual International Pittsburgh Coal Conference 2005, PCC 2005. 22nd Annual International Pittsburgh Coal Conference 2005, PCC 2005, vol. 3, pp. 2209-2225, 22nd Annual International Pittsburgh Coal Conference 2005, PCC 2005, Pittsburgh, PA, United States, 9/12/05.
Limos-Martinez SM, Watanabe K. Geochemistry of coals in Panian Coalfield, Semirara Island, Philippines. In 22nd Annual International Pittsburgh Coal Conference 2005, PCC 2005. 2005. p. 2209-2225. (22nd Annual International Pittsburgh Coal Conference 2005, PCC 2005).
Limos-Martinez, Stella Marris ; Watanabe, Koichiro. / Geochemistry of coals in Panian Coalfield, Semirara Island, Philippines. 22nd Annual International Pittsburgh Coal Conference 2005, PCC 2005. 2005. pp. 2209-2225 (22nd Annual International Pittsburgh Coal Conference 2005, PCC 2005).
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