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Effect of organic matter on the Rietveld quantitative analysis of crystalline minerals in coal gangue

Published online by Cambridge University Press:  20 May 2016

Kezhou Yan ,
Yanxia Guo ,
Xiaoxiao Wu  and
Fangqin Cheng
Kezhou Yan
Affiliation:
State Environmental Protection Key Laboratory of Efficient Utilization Technology of Coal-Waste Resources, Institute of Resources and Environment Engineering, Shanxi University, Taiyuan, China
Yanxia Guo
Affiliation:
State Environmental Protection Key Laboratory of Efficient Utilization Technology of Coal-Waste Resources, Institute of Resources and Environment Engineering, Shanxi University, Taiyuan, China
Xiaoxiao Wu
Affiliation:
State Environmental Protection Key Laboratory of Efficient Utilization Technology of Coal-Waste Resources, Institute of Resources and Environment Engineering, Shanxi University, Taiyuan, China
Fangqin Cheng*
Affiliation:
State Environmental Protection Key Laboratory of Efficient Utilization Technology of Coal-Waste Resources, Institute of Resources and Environment Engineering, Shanxi University, Taiyuan, China
*
a)Author to whom correspondence should be addressed. Electronic mail: cfangqin@sxu.edu.cn
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Abstract

The Rietveld method based on X-ray diffraction (XRD) technology has been commonly applied for the quantitative analysis of crystalline minerals in organic-rich rocks. The presence of organic matter, however, has interference in varying degree to the quantitative result. In this work, the mixed samples of organic matter and crystalline minerals at given proportions were prepared to investigate the effect of organic matter on the Rietveld quantitative analysis of crystalline minerals in coal gangue. The relative standard deviation (RSD) and absolute error (AE) were used to evaluate the precision and accuracy of the quantitative result. The results showed that the presence of organic matter led to a reduction in the precision and accuracy. It was attributed in part to the presence of organic matter, which can produce a background noise in the XRD pattern, especially in the region of 5–30° (2θ). Further results showed that the interference in this region increased with the increase in the organic matter content. The RSD and AE were within the range of 10% and 2%, respectively, when the organic matter content is <30 wt%. Based on this, an approximate method for the Rietveld quantitative analysis of crystalline minerals in coal gangue was established.

Keywords

coal gangueorganic mattercrystalline mineralsX-ray diffractionRietveld method
Type
Technical Articles
Information
Powder Diffraction , Volume 31 , Issue 3 , September 2016 , pp. 185 - 191
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Copyright
Copyright © International Centre for Diffraction Data 2016 

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