Preliminary study on the trace elements in coals with the different degree of coalification in Shanxi, P.R.China

Conference · Thu Dec 31 04:00:00 EST 1998

OSTI ID:349239

Zhang, J; Li, T; Guo, M; Zhang, Y ^[1]; Ren, D; Xu, D ^[2]

---

1. Taiyuan Univ. of Technology, Shanxi (China)
2. China Univ. of Mining and Technology, Beijing (China). Beijing Graduate School

Twelve coal samples collected separately from upper Carboniferous Taiyuan Formation, lower Permian Shanxi Formation, Tertiary brown coal and Quaternary peat in Shanxi province, P. R. China were studied. They cover all different degrees of coalification of coals in Shanxi. Instrumental Neutron Activation Analysis (INAA) was used to determine 32 trace elements (including 8 rare-earth elements (REE)) in these samples. Additional experiments including proximate analysis, ultimate analysis, reflectance value and microscopic examination of the samples have also been undertaken. These analyses show that the Fansi peat shows significant enrichment in alkaline metal and alkaline-earth elements, such as Na, K, Rb, Cs, and Ba, especially K and Na, which are up to 1.49% and 0.946% respectively. The concentrations of these elements decrease with increasing rank in Shanxi coals. As, Fe, Mo, W, Cr, Co and Zr are also enriched in peat. Brown coal is enriched in As, Cr, Co, Na, Cs and Rb and bituminous coals are enriched in Hf, Ta, Th. The concentration of Se increases and Zr decreases with increasing rank. Only some trace elements which occur in coal organically associated are affected by the degree of coalification. There are many factors affecting the contents of trace elements in coal and no clear pattern between increase of rank and concentration of elements.

• OSTI ID: 349239
• Report Number(s): CONF-980985--; ISBN 1-890977-15-2
• Country of Publication: United States
• Language: English

Related Subjects

01 COAL, LIGNITE, AND PEAT
BITUMINOUS COAL
BROWN COAL
CHINA
COAL DEPOSITS
COALIFICATION
CORRELATIONS
GEOCHEMISTRY
MULTI-ELEMENT ANALYSIS
PEAT