التفاصيل البيبلوغرافية
| العنوان: |
Petrology and association of rare earth elements in magmatically altered high-ash coal of Indian origin. |
| المؤلفون: |
Banerjee, Riya, Chakladar, Saswati, Kumar, Alok, Chattopadhyay, Shyamal Kumar, Chakravarty, Sanchita |
| المصدر: |
International Journal of Coal Science & Technology; 6/24/2024, Vol. 11 Issue 1, p1-16, 16p |
| مصطلحات موضوعية: |
RARE earth metals, COAL, PETROLOGY, COAL ash, OXIDE minerals, CHEMICAL processes, CHARCOAL, RARE earth oxides |
| مصطلحات جغرافية: |
INDIA |
| مستخلص: |
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. Article Highlights: A nine-step sequential chemical leaching process employing eco-friendly lixiviants was implemented to delineate the mineralogical associations in high-ash heat altered coal of Indian origin. Dolomite was completely eradicated at the complexation stage implying alteration of this mineral phase due to magmatic influence. LREEs were concluded to be present primarily in the ionic form while HREEs were strongly associated with anatase phase. Petrographic analysis revealed presence of mosaic structures with porous morphology containing un-fused vitrinite. [ABSTRACT FROM AUTHOR] |
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| قاعدة البيانات: |
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