The Relationship between Trace Element Concentrations and Coal-Forming Environments in the No. 6 Coal Seam,Haerwusu Mine,China

Abstract

In order to study the relationship between trace element concentrations and coal-forming environment in the No. 6 Coal, Haerwusu Mine, Inner Mongolia, China, 39 bench samples were taken from the opencast mine, following Chinese Standard Method GB/T 482–2008. The samples were analyzed by an optical microscope, a scanning electron microscope in conjunction with an energy-dispersive X-ray spectrometer (SEM-EDX) analysis, inductively coupled plasma mass spectrometric (ICP-MS). The results indicate that the average contents of vitrinite, inertinite, liptinite are 54.59%, 34.84% and 5.8%, respectively. The concentrations of Li and Ga in the No. 6 coal are higher than those of in world coals, and most of trace elements in the No. 6 coal are correlated with minerals, which are mainly clay minerals, carbonate minerals and sulfide minerals. Two samples were identified as dry forest swamp facies (FtM I), 19 samples as shallow water forest swamp facies (FtM II), and 13 samples as reed swamp facies (RM). Compared with the average contents of world coals, trace elements in No. 6 coal of Haerwusu mine are rich in Li and V, while contents of the other elements are close or lower than the average contents of world coals. However, the variations of CC (Concentration Coefficients) among each swamp type are small and irregular, which may indicate that the concentration of the selected trace elements in the coal is mainly dominated by regional coal-forming environment, not coal-forming microenvironment.

Keywords

Trace elements No. 6 Coal Seam Haerwusu mine Jungar Coalfield

References

Dai

S.F.

Zou

J.H.Y.F.

Ward

C. R.

Wang

X.B.

Xue

W.F.

Liu

S.D.

Tian

H.M.

Sun

X.H.

and Zhou

, 2012. Mineralogical and geochemical compositions of the Pennsylvanian coal in the Adaohai Mine, Daqingshan Coalfield, Inner Mongolia, China. International Journal of Coal Geology 94(1), 250–270.

GB/T 482–2008 (National Standard of P.R. China), 2008. Sampling of Coal in Seam. China Standard Press, Beijing, pp. 1–12. (in Chinese).

Han

D.X.

Ren

D.Y.

Wang

Y.B.

Jin

K.L.

Mao

H.L.

and Qin

, 1996. Coal Petrology of China. China University of Mining and Technology Press, Xuzhou, p. 599. (in Chinese).

Jin

Y.H.

Zhao

C.L.

and Wang

J.X.

, 2013. Coal petrology and facies of No. 6 coal of the Haerwusu Mine, Junger Coalfield, Inner Mongolia. Journal of Coal Science & Engineering 19(3), 295–302.

Ketris

M.P.

and Yudovich

Y.E.

, 2009. Estimations of clarkes for carbonaceous biolithes: World average for trace element contents in black shales and coals. International Journal of Coal Geology 78(2), 135–148.

Liu

H.J.

Zhang

Y.J.

Wang

H.W.

Jia

Y.R.

and Long

Y.Z.

, 1991. Study on lithofacies paleogeography of coal-bearing formations from the Junger Coalfield. Geological Publishing House, Beijing, p. 128. (in Chinese).

Ren

D.Y.

Zhao

F.H.

Dai

S.F.

Zhang

J.Y.

and Luo

K.L.

, 2006. Geochemistry of Trace Elements in Coal. Science Press, Beijing, p. 556. (in Chinese).

Sun

Y.Z.

Zhao

C.L.

Y.H.

Wang

J.X.

and Liu

S.M.

, 2012a. Li distribution and mode of occurences in Li-bearing coal seam #6 from the Guanbanwusu Mine, Inner Mongolia, northern China. Energy Exploration & Exploitation 30(1), 109–130.

Sun

Y.Z.

Yang

J.J.

, and Zhao

C.L.

, 2012b. Minimum mining grade of associated Li deposits in coal seams. Energy Exploration & Exploitation 30(2), 167–170.

10.

Sun

Y.Z.

Zhao

C.L.

Y.H.

Wang

J.X.

Zhang

J.Y.

Jin

Lin

M.Y.

and Kalkreuth

, 2013a. Further Information of the associated Li deposits in the No. 6 Coal seam at Jungar Coalfield, Inner Mongolia, northern China. Acta Geologica Sinica (English Edition) 87(4), 1097–1108.

11.

Sun

Y.Z.

Zhao

C.L.

Zhang

J.Y.

Yang

J.J.

Zhang

Y.Z.

Yuan

and Duan

D.J.

, 2013b. Concentrations of valuable elements of the coals from the Pingshuo Mining District, Ningwu Coalfield, northern China. Energy Exploration & Exploitation 31(5), 727–744.

12.

Swaine

D.J.

, 1990. Trace elements in coal. Butterworth-Heinemann, UK, pp.1–278.

13.

Wang

J.X.

Deng

X.L.

and Kalkreuth

, 2011. The distribution of trace elements in various peat swamps of the No. 11 coal seam from the Antaibao Mine, Ningwu coalfield, China. Energy Exploration and Exploitation 29(4), 517–524.

14.

Wang

S.J.

, 1982. Sporo-pollen assemblages from the late Carboniferous and early Permian coal series in Yaogou colliery, Zhungeer banner, Neimenggu autonomous region, Journal of China Coal Society 2, 36–50.

15.

Sun

Y.Z.

and Kalkreuth

2011. Characteristics of trace elements of the No. 6 Coal in the Guanbanwusu Mine, Junger Coalfield, Inner Mongolia. Energy Exploration & Exploitation 29(6), 827–842.

16.

Zhao

C.L.

, 2015. Distribution and enrichment mechanism of multi-metallic-elements associated with coal in Ordos Basin: Doctoral Thesis, China University of Mining and Technology, Beijing, China, p. 132.

17.

Zhao

F.H.

, 1997. Study on the mechanism of distributions and occurrences of hazardous minor and trace elements in coal and leaching experiments of coal combustion residues: Doctoral Thesis, China University of Mining & Technology, Beijing, China, p. 157.