Petrology and association of rare earth elements in magmatically altered high-ash coal of Indian origin
Riya Banerjee1
Saswati Chakladar2
Alok Kumar3
Shyamal Kumar Chattopadhyay4
Sanchita Chakravarty2
1.Analytical and Applied Chemistry Division,CSIR-National Metallurgical Laboratory,Jamshedpur 831007,Jharkhand,India;Department of Chemistry,IIEST,Shibpur,West Bengal 711103,India2.Analytical and Applied Chemistry Division,CSIR-National Metallurgical Laboratory,Jamshedpur 831007,Jharkhand,India3.Department of Geology,Faculty of Science,University of Malaya,50603 Kuala Lumpur,Malaysia4.Department of Chemistry,IIEST,Shibpur,West Bengal 711103,India
摘要：The extraction of valuables from waste has gained momentum.Thermal influence alters both the organic and inorganic components of coal.Insufficient knowledge on the association of rare earth elements(REEs)with the parent matrix of thermally altered high-ash coals(63％ash)limits the potential for such coals being utilized for isolation of valuables.In this study,we analyzed the distribution and occurrence modes of REEs within a magmatically altered high-ash coal via nine-step sequential extraction,combining Tessier and BCR methods.The total concentration of REEs in the coal sample,on whole coal basis,was found to be 820 ppm,which is significantly higher than the world average.Major mineral oxides were deduced to be those of Si,Fe,Al,Ca,Mg,and Ti.Sequential extraction confirmed that about 66％of HREE and 25％of LREE were included in the residual fraction.LREEs were concluded to be primarily in ionic form,whereas HREEs were speculated to be associated with the TiO2 phase.XRD analyses showed that thermal alteration affected the dolomite phase specifically,which selectively got removed where carbonate-bound elements were assessed.Petrographic analysis supported the magmatic influence and demonstrated the presence of mosaic structures and pores containing unfused vitrinite,with a reflectance value of 3.6.To summarize,the present study pertaining to delineation of association of valuables in high-ash heat-altered coals from an Eastern coalfield in India can potentially open up new avenues for utilizing such coals,which are otherwise considered waste.
机标关键词：associationoriginearthrarealteredcoalelementshigh-ash
论文发表日期：2024-08-28
在线出版日期：2025-08-15（本平台首次上网日期，不代表文献的发表时间）
页数：16( 171-186 )
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