PERENISA, MITHA (2024) RECOVERY LOGAM TANAH JARANG HASIL SULFATION ROASTING-WATER LEACHING GRANIT DENGAN METODE PRESIPITASI DUA TAHAP. S1 thesis, Fakultas Teknik Universitas Sultan Ageng Tirtayasa.
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Abstract
Rare earth elements (REEs) are part of the critical minerals that comprise the lanthanide group, Sc, and Y. The world demand for REEs from 2021 to 2023 has increased from 78 kt to 93 kt. The estimated increase in total demand of REEs until 2026 increased by 4.4%. One of the distributions of REEs in Indonesia is found in granite rocks spread across the islands of Sumatera, Sulawesi, Kalimantan, and Papua. The elemental content of granite is dominated by impurities such as Si, Al, and Fe rather than REEs, therefore a proper method is required to selectively extract REEs from granite. The sulfation roasting method is carried out at the temperature of impurities decomposition in the form of sulfate compounds. The variable of this process is the roasting temperature, which is 500, 600, 700, and 800oC. The resulting filtrate still contains impurities such as Al and Fe, therefore a two-stage precipitation process is required. Stage one precipitation uses CaCO3 with variable pH, namely 2.5; 3; 3.5; and 4. Stage two precipitation uses Ca(OH)2 with variable pH, namely 4.5; 5; 5.5; and 6. The results of this study show that the best temperature for the sulfation roasting process is 600oC, with a total REEs extraction percentage of 1.46%, Al and Fe extraction percentages of 0.15% and 0.09%. The sulfation roasting-water leaching method was ineffective in extracting REEs from granite, as well as the acid direct leaching method using HCl and water leaching, which resulted in a total REEs extraction percentages of 9.53% and 0.09%, respectively. The best stage one precipitation results were obtained under pH 3 conditions, with total REEs recovery of 93.05% and Fe removal of 62.32%. The best stage two precipitation results were achieved with pH 4.5 conditions, namely total REEs recovery of 46,48% and Al removal of 3.,19%. Thus, the precipitation process is better performed in one stage. These results can be a reference in determining the proper sulfation roasting temperature and precipitation pH for the extraction and recovery of REEs from granite.
| Item Type: | Thesis (S1) | |||||||||
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| Additional Information: | Logam tanah jarang (LTJ) atau rare earth elements merupakan bagian dari critical minerals yang terdiri dari kelompok lantanida, Sc, dan Y. Permintaan LTJ di dunia dari tahun 2021 hingga 2023 mengalami peningkatan yaitu dari 78 ribu ton menjadi 93 ribu ton. Perkiraan peningkatan permintaan total LTJ hingga tahun 2026 meningkat sebesar 4,4%. Salah satu sebaran LTJ di Indonesia banyak ditemukan di batuan granit yang tersebar di pulau Sumatera, Sulawesi, Kalimantan, dan Papua. Kandungan unsur pada granit lebih didominasi oleh pengotornya, seperti Si, Al, dan Fe dibandingkan LTJ. Maka, diperlukan metode yang tepat untuk mengekstraksi LTJ dari granit secara selektif. Metode sulfation roasting dilakukan pada temperatur dekomposisi pengotor dalam bentuk senyawa sulfat. Variabel proses ini adalah temperatur roasting, yaitu 500, 600, 700, dan 800oC. Filtrat hasil tersebut masih mengandung pengotor seperti Al dan Fe, sehingga diperlukan metode presipitasi dua tahap. Presipitasi tahap 1 menggunakan CaCO3 dengan variabel pH, yaitu 2,5; 3; 3,5; dan 4. Presipitasi tahap 2 menggunakan Ca(OH)2 dengan variabel pH, yaitu 4,5; 5; 5,5; dan 6. Hasil penelitian ini menunjukkan temperatur terbaik proses sulfation roasting adalah 600oC dengan persen ekstraksi total LTJ sebesar 1,46% dan persen ekstraksi Fe dan Al sebesar 0,15% dan 0,09%. Metode sulfation roasting-water leaching tidak efektif untuk mengekstraksi LTJ dari granit, begitu juga metode acid direct leaching menggunakan HCl dan water leaching yang menghasilkan persen ekstraksi total LTJ sebesar 9,53% dan 0,09%. Hasil presipitasi tahap 1 terbaik dicapai dengan kondisi pH 3, yaitu persen recovery total LTJ sebesar 93,05% dan persen penghilangan Fe sebesar 62,32%. Hasil presipitasi tahap 2 terbaik dicapai dengan kondisi pH 4,5, yaitu persen recovery total LTJ 46,48% dan persen penghilangan Al sebesar 31,19%. Dengan demikian, proses presipitasi lebih baik dilakukan dengan satu tahap. Hasil tersebut dapat menjadi acuan dalam menentukan temperatur sulfation roasting dan pH presipitasi yang tepat untuk proses ekstraksi dan recovery LTJ dari granit. | |||||||||
| Subjects: | T Technology > T Technology (General) T Technology > TN Mining engineering. Metallurgy |
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| Divisions: | 03-Fakultas Teknik 03-Fakultas Teknik > 27201-Jurusan Teknik Metalurgi |
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| Depositing User: | Mitha Sophia Perenisa | |||||||||
| Date Deposited: | 30 Oct 2024 13:39 | |||||||||
| Last Modified: | 30 Oct 2024 13:39 | |||||||||
| URI: | http://eprints.untirta.ac.id/id/eprint/43381 |
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