PENGARUH VARIASI JUMLAH REDUKTOR BATU BARA SUBBITUMINUS DAN BASISITAS DENGAN TAMBAHAN ADITIF SODIUM SULFAT (Na2SO4) PADA PROSES REDUKSI SELEKTIF BIJIH NIKEL LATERIT
| Main Author: | YULIANA SARI, 1617041027 |
|---|---|
| Format: | Bachelors NonPeerReviewed Book Report |
| Terbitan: |
FAKULTAS MATEMATIKA DAN ILMU PENGETAHUAN ALAM
, 2020
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| Subjects: | |
| Online Access: |
http://digilib.unila.ac.id/64524/1/ABSTRAK.pdf http://digilib.unila.ac.id/64524/2/SKRIPSI%20FULL.pdf http://digilib.unila.ac.id/64524/3/SKRIPSI%20TANPA%20BAB%20PEMBAHASAN.pdf http://digilib.unila.ac.id/64524/ |
Daftar Isi:
- Telah dilakukan penelitian pengaruh variasi reduktor batu bara subbituminus dan basisitas dengan tambahan aditif sodium sulfat (Na2SO4) pada proses reduksi selektif bijih nikel laterit. Penelitian ini bertujuan untuk mengetahui pengaruh penambahan variasi jumlah batu bara subbituminus dan basisitas terhadap peningkatan kadar dan perolehan nikel dalam konsentrat feronikel, mengetahui fasa yang terbentuk pada hasil reduksi bijih nikel dan mengetahui ukuran butir hasil reduksi bijih nikel. Proses reduksi dilakukan dengan dua tahap yaitu tahap pertama menggunakan Na2SO4 (6 gram) dan variasi jumlah batu bara subbituminus berdasarkan stoikiometri 0,0625; 0,125; 0,25; 0,4; 0,5; 0,75; 1; 1,25 dan 1,5. Sementara, tahap kedua menggunakan Na2SO4 (6 gram), batu bara subbituminus stoikiometri 0,4 dan variasi basisitas 0,1; 0,2; 0,3; 0,4; 0,5; 0,6; 0,7; 0,8; 0,9 dan 1,0. Bijih nikel laterit direduksi pada suhu 1150 °C selama 60 menit. Karakterisasi dilakukan dengan X-Ray Flouresence (XRF), X-Ray Diffraction (XRD), Mikroskop Optik (MO) dan Scanning Electron Microscope (SEM). Hasil reduksi bijih nikel laterit didapatkan semakin meningkat kadar dan perolehan nikel dan mencapai optimal pada stoikiometri 0,4 dan basisitas 0,6. Difraktogram XRD variasi jumlah batu bara subbituminus dan basisitas menunjukkan bahwa bijih nikel laterit membentuk fasa feronikel, forsterit, troilit dan kuarsa. Basisitas penambahan Al2O3 juga membentuk fasa alumina dan aluminium besi magnesium oksida, basisitas penambahan SiO2 juga membentuk wadsleyit II, basisitas penambahan CaO juga membentuk fasa gipsum dan arkemanit. Ukuran diameter rata-rata butir feronikel terbesar pada stoikiometri 1 yaitu 10,6 μm dan basisitas 1,0 penambahan MgO yaitu 14,43 μm. Kata kunci: Feronikel, bijih nikel laterit, reduksi selektif, batu bara subbituminus, basisitas. ABSTRACT The effect of subbituminus and bacisity variations in the addition additives of sodium sulfate (Na2SO4) to the selective reduction of laterite nickel ore has been carried out. This study aims to determine the effect of adding variations in the amount of subbituminous coal and bacisity to increase nickel content and recovery in ferronickel concentrates, determine the phases formed in nickel ore reduction results and determine grain size in nickel ore reduction results. The reduction process is carried out in two stages are the first stage uses Na2SO4 (6 grams) and variations in the amount of subbituminous coal based on stoichiometry 0.0625; 0.125; 0.25; 0.4; 0.5; 0.75; 1; 1.25 and 1.5. Meanwhile, the second stage uses Na2SO4 (6 grams), stoichiometric subbituminous coal 0,4 and bacisity variations 0,1; 0.2; 0.3; 0.4; 0.5; 0.6; 0.7; 0.8; 0.9 and 1.0. Laterite nickel ore is reduced at 1150 °C for 60 minutes. Characterization was done by X-Ray Fluorescence (XRF), X-Ray Diffraction (XRD), Optical Microscope (OM) and Scanning Electron Microscope (SEM). The results of the reduction of lateritic nickel ore are obtained increasing levels and the acquisition of nickel and reach optimal stoichiometry 0.4 and bacisity 0.6. XRD diffractogram variations in the amount of subbituminous coal and bacisity indicate that the laterite nickel ore forms ferronickel, forsterite, troilit and quartz phases. The bacisity addition of Al2O3 also forms the alumina and aluminum iron magnesium oxid phases, the bacisity addition of SiO2 also forms wadsleyite II phase and the bacisity addition of CaO also forms the gypsum and arkemanite phases. The average diameter size of the largest ferronickel grains in stoichiometry 1 is 10.6 μm and the bacisity 1.0 addition of MgO is 14.43 μm. Keywords: Ferronickel, laterite nickel ore, selective reduction, subbituminous coal, bacisity.