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Teknologi Pemrosesan Nikel
(Bijih laterit)
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Mineral Sulfida
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Bijih-bijih nikel
Limonite
(Fe, Ni)O(OH).nH2O
Garnierite
(Ni, Mg)6S14O10(OH)8
Pentlandite (Ni, Fe)9S8
Kendari:
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Data Tentang Lateritic Ore
• 2003 :
– diproduksi 1,2 Juta Ton Primary Nickel
– 42 % nya dibuat dari lateritic ore dengan
proses pyrometalurgy
• 2012 :
– Diprediksi 50% world primary nickel berasal
dari pengolahan lateritic ore (dengan proporsi
proses hydrometalurgy yang meningkat)
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Ni Lateritic Ore
• Berasal dari batuan ferromagnesium silicate mineral
• Nikel ter “leaching” dari lapisan atas ke bawah dengan komposisi kimia serta mineraloginya yang bermacam macam
• Parameter penting:
– Ratio Fe/ Ni
– Ratio SiO2/ MgO
– Chemical & physical H2O content
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Guideline Teknologi Proses
Pengolahan Laterite Ore
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Proses Pyrometalurgy
Nickel Laterite Ore
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Tahapan Proses
Pyrometalurgy Untuk
Ni Lateritic Ore
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Input dan Output
• Typical Feed untuk Laterite Smelter – 1,5 – 2,5 % Ni
– 25 – 35 Moisture content
– 10 – 12 crystalline water
– umumnya digunakan teknik blending (pencampuran dari berbagai sumber „ore mining”
• Product – Ferro Nickel
– Ferromagnesium silicate slag (memiliki high liquidus temperature)
• Karenanya highly energy intensive operation (electric consumstion rata rata 502 Kwh/ Ton Calcine)
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Pyrometalurgy Ni-Lateritic Ore
• Drying (Rotary Kiln) – menurunkan moisture content ke 15 – 20%
• Calcining – Reduction (Rotary Kiln) – Reductor : bitumious coal/ antracite
– Temp : 700 – 900 C
– Dust rate : 10 – 20%, di aglomerisasi, recycle
• Electric Furnace Smelting – Power density : 230 – 360 Kw/m2 furnace hearth
– Electric consumtion : 379 – 600 Kwh/ Ton calcine
• Product : – Ore dengan Fe/Ni < 6 --- high carbon ferronickel
– Ore dengan Fe/Ni > 6 --- low carbon ferronickel
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Proses Pyrometalurgy
Nickel Laterite Ore
PT. Aneka Tambang
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Dryer & Reduction Kiln
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Electric Furnace & Converter
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Laterite Nickel Ore Smelter
Di Dunia
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Proses Hydrometalurgy
Nickel Laterite Ore
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Caron Process
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HPAL Process
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Other Hydrometallurgical
Processes
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Rencana
Hydrometalurgy
PT. Antam
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Material AutoClave
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Resume Teknologi Pengolahan
Laterite Nickel Ore
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