Konsentrasi dan Proses Pengayaan Rare Earth Elements and Yttrium (REY) Pada Batubara Formasi Warukin, Cekungan Barito, Kabupaten Hulu Sungai Selatan, Provinsi Kalimantan Selatan
Muhammad Zulfiqar Jihad Putra, Prof. Dr. Ir. Ferian Anggara, S.T., M.Eng., IPM. , Ir. Esti Handini, S.T., M.Eng., D.Sc.
2024 | Skripsi | TEKNIK GEOLOGI
The utilization of Rare Earth Elements and Yttrium (REY) has significantly increased in high-level material industries and is projected to continue rising for several decades. With the growing demand for REY, alternative sources are needed, and one such source is coal and the ash resulting from coal combustion. The Warukin Formation in the Barito Basin is an interesting coal-bearing formation for in-depth study due to its geological conditions that may enrich coal with REY. This research aims to determine the concentration and mode of occurrence of REY in coal in the research area, as well as the geological processes influencing it. Field data collection was conducted using the ply-by-ply sampling method, followed by sample preparation for geochemical analysis using Inductively Coupled Plasma - Mass Spectrometry-Atomic Emission Spectrometry (ICP-MS/AES), organic petrography, Scanning Electron Microscopy-Energy Dispersive X-Ray Spectroscopy (SEM-EDX), and proximate analysis.
Overall, four lithotype appearances were identified in the coal in the research area: bright, dull, bright-banded, and dull-banded coal. The maseral composition of the coal in the research area consists of vitrinite (58.03% vol.), liptinite (23.56% vol.), inertinite (18.17% vol.), and minerals (0.23% vol.). The coal ash content is relatively high,1.36% to 15.45% (wt%, adb) with an average value of 4% (wt%, adb). The paleomires in some seams varies from topogenous to ombrogenous mires. The average concentration of REY in coal in the research area is 29.22 ppm, below the average REY content in world low-rank coal. However, two individual samples, MS02 1C and L5A 3C, exceed the average world low-rank coal REY content, with concentrations of 76.75 ppm and 76.74 ppm, respectively. The Warukin Formation coal is enriched with dominant HREY and LREY associated with terrigenous and infiltrational types. The REY enrichment process is influenced by parting during the deposition process, followed by leaching and adsorption onto organic material.
Kata Kunci : Rare Earth Elements and Yttrium (REY), Batubara Formasi Warukin, proses pengayaan