Optimasi Variabel Rasio Solid To Liquid dan Suhu Pada Proses Pelindian Lantanum Oksalat Dengan Metode Hidrometalurgi

Istiqomah, Istiqomah (2023) Optimasi Variabel Rasio Solid To Liquid dan Suhu Pada Proses Pelindian Lantanum Oksalat Dengan Metode Hidrometalurgi. Other thesis, Institut Teknologi Sepuluh Nopember.

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Abstract

Minyak bumi dan batu bara yang hingga saat ini masih menjadi sumber dari energi semakin memberikan dampak yang merugikan bagi lingkungan. Pemanfaatan energi alternatif, fuel cell, dengan pengolahan unsur logam tanah jarang (LTJ) dari sisa aktivitas pertambangan menjadi salah satu upaya menuju energi yang ramah bagi lingkungan (green energy). Unsur logam tanah jarang, salah satunya lantanum, memiliki kelimpahan yang cukup besar di alam, khususnya Indonesia. Dalam penelitian ini dilakukan recovery dalam bentuk senyawa nitrat sebagai prekursor fabrikasi elektrolit LDC (Lanthanum doped Ceria) melalui tahapan pelindian yang terdiri atas pelarutan, optimasi variabel, dan kristalisasi. Penelitian terkait pelindian unsur LTJ lantanum (La) pada beberapa tahun terakhir menunjukkan faktor-faktor yang paling signifikan mempengaruhi efisiensi pelindian unsur lantanum adalah rasio S/L, suhu pemanasan saat pelindian, dan konsentrasi asam (leachant). Efisiensi pelindian paling optimum dicapai sebesar 83% dengan asam nitrat 4.1 M, suhu pelindian 80 oC, dan rasio S/L sebesar 1/12 g/mL dari bahan baku fosfat. Sifat senyawa oksalat yang lebih mudah terlarut dibandingkan fosfat menjadi perlu untuk diteliti pengaruh variasi suhu dan rasio S/L sehingga diketahui kondisi optimum dalam proses recovery unsur lantanum dari lantanum oksalat. Pelindian menggunakan asam nitrat sebagai leachant berfungsi untuk melarutkan sekaligus memisahkan unsur lantanum dari material residu bahan baku lantanum oksalat. Efisiensi pelindian lantanum yang didapatkan mencapai 72.86%. Padatan lantanum nitrat heksahidrat memiliki stuktur semi-kristalin dengan titik leleh sekitar 90.67-212.8 oC. Kandungan lantanum dalam bentuk lantanum oksida (La2O3) dari kristal hasil recovery sebesar 96.48% dengan massa produk kristal mencapai 2.8 gram. Kondisi maksimum dari pelindian lantanum oksalat adalah pada suhu 80°C dalam leachant asam nitrat 4.1 M dengan rasio S/L sebesar 1/15 g/mL. Pengaplikasian lantanum nitrat hasil recovery dalam sintesis LDC dengan metode sol-gel menunjukkan kristal LDC dengan fasa tunggal (CeO2). Lantanum (La3+) sebagai doping pada LDC memberikan struktur kristal dengan konduktivitas tinggi dan kestabilan termal yang baik sebagai material elektrolit SOFC (Solid Oxide Fuel Cell).
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Petroleum and coal, as the primary sources of energy, caused various disadvantages to the environment. The alternative energy used, fuel cells, by processing rare earth elements (REE) from the by-product of mining activities is one of our efforts towards eco-friendly energy. Lanthanum has been the most abundant rare earth element (REE) in nature, especially in Indonesia. In this study, lanthanum's recovery was carried out on nitrate compounds as precursors for LDC (Lanthanum doped Ceria) electrolyte fabrication through leaching stages consist of dissolution, variabel optimization, and crystallization. Some researches related to the leaching of lanthanum (La) REE in these years have shown that the most significant factors affecting the leaching efficiency of lanthanum are the S/L ratio, heating temperature during leaching, and acid concentration (leachant). The optimum leaching efficiency was achieved at 83% using 4.1 M nitric acid, leaching temperature of 80 oC, and S/L ratio of 1/12 g/mL of phosphate raw material. Oxalate compounds are naturally more soluble than phosphates makes it necessary to study the effect of variations in temperature and S/L ratio so the optimum conditions are known in recovering process of lanthanum elements from lanthanum oxalate. Leaching process in nitric acid solution (as the leachant) is dissolving and separating lanthanum elements from residual which contained in the raw material. The highest lanthanum leaching efficiency reached 72.86%. Lanthanum nitrate hexahydrate product has a semi crystalline structure with range of melting point around 90.67 to 212.8 oC. The lanthanum’s content which form lanthanum oxide (La2O3) in the recovered crystals is about 96.48% with the maximum mass of crystal product about 2.8 grams. The leaching process of lanthanum oxalate has its maximum condition in 4.1 M nitric acid leachant with S/L ratio 1/15 g/mL at a heating temperature 80 °C. Applying the recovered lanthanum nitrate hexahydrate in LDC synthesis using sol-gel method showed a single-phase structure (CeO2). Lanthanum’s cation (La3+) as doping in LDC provides a crystal structure with high conductivity and thermal stability as electrolyte material for SOFC (Solid Oxide Fuel Cell).

Item Type:	Thesis (Other)
Uncontrolled Keywords:	Efisiensi Pelindian, Hidrometalurgi, Lantanum Nitrat, Lanthanum doped Ceria (LDC), Pelindian, Leaching Efficiency, Hydrometalurgy, Lanthanum Nitrate, Leaching
Subjects:	Q Science > QD Chemistry T Technology > TN Mining engineering. Metallurgy > TN688 Hydrometallurgy
Divisions:	Faculty of Science and Data Analytics (SCIENTICS) > Chemistry > 47201-(S1) Undergraduate Thesis
Depositing User:	Istiqomah Istiqomah
Date Deposited:	21 Sep 2023 03:40
Last Modified:	21 Sep 2023 03:40
URI:	http://repository.its.ac.id/id/eprint/104446

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