The Occurrence of Rare Earth and Radioactive Elements in the Associated Minerals with Raw Coal by EDX-SEM and XRD

Rui-lin YANG; Yan BAI

doi:10.15898/j.cnki.11-2131/td.201811210125

Rock and Mineral Analysis > 2019 > 38(4): 382-393. > DOI: 10.15898/j.cnki.11-2131/td.201811210125

Rui-lin YANG, Yan BAI. The Occurrence of Rare Earth and Radioactive Elements in the Associated Minerals with Raw Coal by EDX-SEM and XRD[J]. Rock and Mineral Analysis, 2019, 38(4): 382-393. DOI: 10.15898/j.cnki.11-2131/td.201811210125

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The Occurrence of Rare Earth and Radioactive Elements in the Associated Minerals with Raw Coal by EDX-SEM and XRD

Rui-lin YANG^1,,
Yan BAI²

1.
Center of Analysis and Test, Shanxi Normal University, Linfen 041004, China
2.
Laboratory 213 of Shanxi Geology Mineral Bureau, Linfen 041000, China

More Information

Received Date: November 11, 2018
Revised Date: March 10, 2019
Accepted Date: April 08, 2019
Published Date: June 30, 2019

Abstract

HIGHLIGHTS
(1) Further method standardization of studying the occurrence of rare earth and radioactive elements in raw coal.

(2) Back scattered electron imaging and EDS-point were used to improve the sensitivity of rare earth and radioactive elements in raw coal.

(3) Illustration of the occurrences of six rare earth elements and one radioactive element in raw coal from the Huoxi coalfield.

ABSTRACT

BACKGROUNDThe study on the occurrences of rare earth and radioactive elements in raw coal is of great significance in terms of whether the raw coal is concentrated or dispersed, the emission of fly ash is intercepted, and the rare earth elements (REEs) and radioactive elements are extracted from raw coal or fly ash. Previous studies showed that the occurrences of rare earth and radioactive elements in raw coal of various mining areas are different.
OBJECTIVESTo study the occurrences of rare earth and radioactive elements in 175 coal samples from two mining areas in the Huoxi coalfield of Shanxi Province.
METHODSThe analysis region was located by back scattered electron imaging (BSEI), and the main associated minerals were determined by EDS-mapping and powder X-ray diffraction. The trace associated minerals were determined by BSEI and EDS-point methods.
RESULTSSix rare earth elements and a radioactive element were determined in the coal samples. Cerium, lanthanum and neodymium were associated with kaolinite minerals in the form of phosphate, partly occuring in minerals containing alumina or silicon oxide, and in carbon to a small degree. Yttrium and dysprosium existed independently in carbon in the form of phosphate or oxide, whereas scandium was found in zircon, and thorium is found in monazite.
CONCLUSIONSThe REE in the coal samples of the mining area were associated with other minerals in the form of fine-grained authigenic minerals, and a few occurred as independent minerals in carbon. The radioactive element thorium was associated with monazite.

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References (33)

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