A Preliminary Economic Evaluation of Rare Earth Element and Yttrium (REY) in Indonesian Coal: Progress and Future Prospect

Aulia Agus Patria, Ferian Anggara

Abstract


Coal deposits have fascinated much attention in recent years due to its by-product waste as promising alternative sources for rare earth metals. Rare earth metals concentration in many coals and coal ashes are known have equal to or higher than those found in conventional ore. Indonesia is one of the most extensive coal-bearing sedimentary basins in SE Asia with unique tectonic and geological control that might be significance as prospective country of rare metals recovery from coal. This study shows recent progress from several Indonesian coal-bearing sedimentary basins: Ombilin, South Sumatra and Pasir basin. Surprisingly, the REY concentration in Ombilin, South Sumatera and Pasir basin has higher than the average world-coal with 126.15 ppm, 203.72 and 285.53 ppm, respectively. Based on the relationship market demand and supply of individual REY in recent years proposed by Seredin and Dai (2012), all of coal samples were clustered into Promising (II) type with base of critical outlook is 0.7 and cut-off grade is 1000 ppm in coal ashes. It comprises the various REY distribution types and can be regarded as promising REY raw metrials for economic development. REY-enrichment processes in Indonesian coal are different due its tectonic and geological processes that control the basin formation, both of pre-, syn- and post-forming. Genetically, major REY-enrichment processes in Indonesian coal are controlled by tuffaceous; infiltrational; and terrigenous process. Tuffaceous process is related to volcanism that produce tonstein layer during coal peatification, this type is determined in South Sumatera and Pasir basin. Terrigenous process is controlled by provenance sediment-source during coal-bearing formation is formed; basaltic-igneous basement is major controlled REY-enrichment in Ombilin and Pasir basin. Injections of marine water during coal peatification also known that lead REY-enrichment, this type called infiltrational type and its presence in all three basins. Recent study about REY-rich in Indonesian coal shows significance prospect for future rare earth metals recovery. Further study is needed in unexplored coal-bearing sedimentary basin such as Tarakan, Asem-asem, Barito, Ketungau, Melawi, Salawati and Bintuni basin.


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References


Anggara, F., Amijaya, D. H., Harijoko, A., Tambaria, T. N., Sahri, A. A., and Asa, Z. A., (2018) “Rare earth element and yttrium content of coal in the Banko coalfield, South Sumatra Basin, Indonesia: Contributions from tonstein layers”, International Journal of Coal Geology, 196, pp. 159-172.

Anggara, F., Cikasimi, M., Rahmat, B., Wibisono, S. A., Susilawati, and R., (2019) “Karakteristik dan genesa pengayaan unsur-unsur tanah jarang pada batubara lapangan Muara Tiga Besar Utara, Tanjung Enim, Cekungan Sumatera Selatan,” Buletin Sumber Daya Geologi, 14(3), pp. 198-212.

Dai, S., Graham, I. T., and Ward, C. R., (2016) “A review of anomalous rare earth elements and yttrium in coal,” International Journal of Coal Geology, 159, pp. 82-95.

Dai, S., and Finkelman, R. B., (2018) “Coal as a promising source of critical elements: Progress and future prospects”, International Journal of Coal Geology, 186, pp. 155 – 164.

Fadhilah, A. A., (2019) Pengayaan Rare Earth Elements and Yttrium pada batubara eosen lapangan batubara Senakin, Kalimantan bagian tenggara, Indonesia, Thesis (Bachelor), Universitas Gadjah Mada, Yogyakarta, Indonesia.

Friederich, M. C., Moore, T.A., and Flores, R.M., (2016) “A regional review and new insights into SE Asian Cenozoic coal-bearing sediments: Why does Indonesia have such extensive coal deposits”, International Journal of Coal Geology, 166, pp. 2–35.

Patria, A. A., (2020) Potensi pengayaan rare earth element and yttrium (REY) pada batubara Formasi Sawahlunto, Cekungan Ombilin, Sumatra Barat, Thesis (Bachelor), Universitas Gadjah Mada, Yogyakarta, Indonesia.

Pecht, M. G., Kaczmarek, R. E., Song, X., Hazelwood, D. A., Kavetsky, R. A., and Anand, D. K., (2012) Rare Earth Materials: Insights and Concerns. CALCE EPSC Press, College Park, MD, USA, pp. 194.

Seredin, V. V. and Finkelman, R. B., (2008) “Metalliferous coals: A review of the main genetic and geochemical types”, International Journal of Coal Geology. Elsevier B.V., 76(4), pp. 253–289. doi: 10.1016/j.coal.2008.07.016.

Seredin, V. V. and Dai, S., (2012) “Coal deposits as potential alternative sources for lanthanides and yttrium”, International Journal of Coal Geology, 94, pp. 67–93, doi:10.1016/j.coal.2011.11.001.




DOI: https://doi.org/10.51835/ijeg.2021.1.1.339

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