Garuda - Garba Rujukan Digital

Agus Budi Prasetyo

Pusat Penelitian Metalurgi dan Material - LIPI

Author-ID : 6151620

Industrial & Manufacturing Engineering Materials Science & Nanotechnology

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Kinetika dan Mekanisme Pelindian Limonit : Pengaruh Waktu dan Temperatur [Kinetics and Mechanism of Limonite Nickel Ore Dissolution : Effect of Time and Temperature] Eni Febriana; Agung Tristiyan; Wahyu Mayangsari; Agus Budi Prasetyo
Metalurgi Vol 33, No 2 (2018): Metalurgi Vol. 33 No. 2 Agustus 2018
Publisher : National Research and Innovation Agency (BRIN)

Leaching by using sulfuric acid for nickel extraction of Halmahera limonite ore was investigated. Characterization of the ore was conducted by XRD (x-ray diffraction), XRF (x-ray flourescence), and SEM (scanning electron microscopy). The leaching was carried out under atmospheric pressure. Kinetic of leaching was studied by following the shrinking core model. The effect of temperatur and time were studied at various temperatures of 30, 50, and 90 °C with leaching time up to 480 minutes. A maximum 95% Ni extraction value was obtained for 480 min leaching at 90 °C from -150+200 mesh of limonitic nickel ore, with a concentration of H2SO4 of 1 M and a 2.5% ore / liquid ratio. The results show that the leaching rate of Ni is generally controlled by diffusion through the product layer with activation energy for the leaching of 78.0 kJ/mol. The leachingmechanism of limonite ores was identified from the result of residual leaching XRD graph. With increasing temperatur and the longer of leaching time, % extraction of Ni was increased. This condition followed by increasing of the quartz peak’s intensity at 2 = 26 °. AbstrakPelindian dengan pelarut asam sulfat untuk ekstraksi nikel dari bijih limonit Halmahera telah diteliti. Karakterisasi bijih menggunakan XRD, XRF, dan SEM. Pelindian dilakukan pada tekanan atmosfir. Kinetika pelarutan dipelajari dengan mengikuti model Shrinking Core. Pengaruh temperatur dan waktu yang dipelajari yaitu pada temperatur 30oC, 50oC, dan 90oC dengan waktu pelindian hingga 480 menit. Nilai % ekstraksi Ni maksimum sebesar 95,9% diperoleh pada pelindian selama 480 menit pada temperatur 90oC. Hasil analisis menunjukkan bahwa laju pelarutan Ni secara umum dikendalikan oleh difusi. Energi aktivasi untuk pelindian sebesar 83,8 kJ/mol. Mekanisme pelarutan bijih limonit diidentifikasikan dari grafik XRD residu hasil pelindian. Semakin tinggi temperatur dan semakin lama waktu pelindian memperbesar % ekstraksi Ni diikuti dengan meningkatnya intensitas puncak kuarsa.

Peningkatan Kadar Nikel Dalam Laterit Jenis Limonit Dengan Cara Peletasi, Pemanggangan Reduksi Dan Pemisahan Magnet Campuran Bijih, Batu Bara, Dan Na2SO4 [Upgrading of Nickel Content in The Limonitic Laterite Ores by Pelletizing, Reduction Roasting and Magnetic Separation of The Mixed Ores, Coal and Sodium Sulphate] Rudi Subagja; Agus Budi Prasetyo; Wahyu Mayang Sari
Metalurgi Vol 31, No 2 (2016): Metalurgi Vol. 31 No. 2 Agustus 2016
Publisher : National Research and Innovation Agency (BRIN)

In Indonesia, laterite nickle ore that is low grade nickel (<1.5%) has not been used well because it is not considered beneficial. At present work, the experiment to increase nickel grade in the limonitic type of laterite ores has been caried out by pelletizing a limonitic type of laterite ores, coal and Na2SO4 mixture, it was followed with reduction roasting of pellet in muffle furnace at temperatues 800 ºC to 1100 ºC and reduction roasting time from 0,5 hours to 4 hours. The reduced ore from reduction roasting process was grounded in vibrating mill, then mixed with water and passed to magnetic separator to separate nickel concentrates from the tailing. The concentrate with 10.28% of nickel grade and 66,57% of iron grade was produced from hour, 10 % of coal addition and 20% of Na2SO4 addition with recovery of nickel and iron in the consentrate 64,77% and 34,66% respectively.AbstrakPada penelitian ini telah dilakukan percobaan untuk meningkatkan kadar nikel dalam bijih nikel laterit jenis limonit dengan cara membuat pelet dari campuran bijih nikel laterit jenis limonit, batubara dan natrium sulfat, dilanjutkan dengan pemanggangan reduksi pelet dalam tungku mufle pada temperatur 800 0 C sampai dengan 1100 o C dan waktu pemanggangan reduksi dari 0,5 jam sampai dengan 4 jam. Kalsin yang dihasilkan dari proses pemanggangan kemudian digiling dalam vibrating mill untuk selanjutnya dicampur dengan air dan dilewatkan kedalam alat pemisah magnet sehingga dihasilkan konsentrat dan tailing. Konsentrat dengan kadar nikel 10,28 % dan kadar besi 66,57 % diperoleh dari kalsin hasil proses pemanggangan reduksi pada temperatur 1000 o C selama 1 jam, penambahan batubara 10 % dan penambahan natrium sulfat 20 %, dimana perolehan nikel dan besi dalam konsentrat masing masing adalah 64,77 % dan 34,66 %

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