elektrorefining
TRANSCRIPT
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PREVIEW OF ELECTROREFINING
ASSALAMUALAIKUM WR. WB
AZHAR HILMI FADILLAH3334081613
TEKNIK METALURGI
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12 April 2011
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OUTLINE
PENDAHULUAN
ELEKTROREFINING
TINJAUAN SECARA METALURGI- ASPEK KINETIKA- ASPEK TERMODINAMIKA
DAFTAR PUSTAKA
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PENDAHULUAN
ELEKTROLISIS
Suatu sel dengan reaksi tidak spontan, agar bereaksi diperlukan energi listrik dari sumber listrik di luar sel. Energi listrik sel digunakan untuk reaksi elektrokimia.
ELEKTROREFINING
Proses elektrolitik yang dilakukan untuk pemurnian logam yang biasanya telah mengalami pemurnian dengan cara lain, dengan harapan mencapai kemurnian setinggi-tingginya.
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ELEKTROREFINING
Anodic Reaction: M (impure) Mn+ + ne
Cathodic Reaction: Mn+ + ne M (pure)
Net Reaction: M (impure) M (pure)
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Gambar 1. Skematik proses elektrolisis
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ELEKTROREFINING
AQUEOUS
SERI
PARALEL
FUSED SALT
LOGAM REAKTIF
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Gambar 2. Jenis – jenis elektrorefining
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Gambar 3. sistem seri elektrorefining
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Gambar 4. sistem paralel elektrorefining
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TINJAUAN SECARA METALURGI ASPEK KINETIKA
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Katoda
H+ + e H2
M+ + e M2 BulkSolution
M+
III
III M+
IV
V VI
NBL
Gambar 5. Skemateik reaksi liquid-solid
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Lanjutan
Keterangan Kinetika :
Hanya ion M+ yang terdekat dengan katoda yang akan direduksi.
M+ + e M
Perbedaan konsentrasi ion logam mengakibatkan overpotensial, yang disebut over potensial konsentrasi (ηc).
Akibat laju ion hidrogen (H+) yang lambat di permukaan katoda juga menyebabkan overpotensial, disebut overpotensial aktivasi.
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KINETIKA ELEKTROREFINING
Reaksi control-perpindahan massa – overpotensial konsentrasi
Kontrol laju reaksi antarmuka – overpotensial aktivasi
Dimana A dan B adalah konstan. Persamaan (3) dikenal dengan Tafel
....... (1)
....... (3)
....... (2)
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Gambar 6. Profil konsentrasi dekat permukaan katoda
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Laju Deposit Logam
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....... (4)
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PENGENDAPAN LOGAM
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....... (5)
....... (6)
....... (5)
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ASPEK TERMODINAMIKA
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....... (7)
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DAFTAR PUSTAKA GHOSH, AHINDRA & RAY, H SHANKER. 1991. PRINCIPLE OF
EXTRACTIVE METALLURGY. NEW DELHI : JOHN WILLEY & SONS
PHELKE, D ROBERT. 1973. UNIT PROCESSES OF EXTRACTIVE METALLURGY. NEW YORK: ELSEVIER
ROSENQVIST, TERKEL. 1974. PRINCIPLE OF EXTRACTIVE METALLURGY. NEW YORK : McGRAW-HILL
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TERIMA KASIH
WASSALAMUALAIKUM WR. WB.
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