Petrology and association of rare earth elements in magmatically altered high-ash coal of Indian origin  

作　　者：Riya Banerjee Saswati Chakladar Alok Kumar Shyamal Kumar Chattopadhyay Sanchita Chakravarty 

机构地区：[1]Analytical and Applied Chemistry Division,CSIR-National Metallurgical Laboratory,Jamshedpur 831007,Jharkhand,India [2]Department of Chemistry,IEST,Shibpur,West Bengal 711103,India [3]Department of Geology,Faculty of Science,University of Malaya,50603 Kuala Lumpur,Malaysia

出　　处：《International Journal of Coal Science & Technology》2024年第4期171-186,共16页国际煤炭科学技术学报(英文)

摘　　要：The extraction of valuables from waste has gained momentum.Thermal infuence 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 TiO_(2) 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 coalfeld in India can potentially open up new avenues for utilizing such coals,which are otherwiseconsidered waste.

关 键 词：Heat altered coal ASSOCIATION Petrography-Sequential leaching XRF XRD 

分 类 号：P61[天文地球—矿床学]