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Peningkatan kadar dan rasio mangan pada bijih mangan lokal kadar rendah melalui proses benefisiasi dengan variabel temperatur pada reduction roasting = The enhancement of manganese grade and its ratio from local low grade manganese ore through beneficiation process with the variation of temperature on reduction roasting process

Satrio Amarela; Bambang Suharno, supervisor; Fajar Nurjaman, supervisor; Deni Ferdian, examiner ([Publisher not identified] , 2016)

 Abstrak

ABSTRAK
Sekitar 90% bijih mangan di dunia digunakan untuk pembuatan ferromangan dan
ferrosilicomangan sebagai material paduan dalam proses steel making. Penambahan
unsur mangan dalam wujud paduan ferromangan pada proses steel making mampu
meningkatkan kekerasan dan ketangguhan baja. Ferromangan diperoleh dari
pengolahan bijih mangan metallurgical grade dengan proses peleburan. Bijih mangan
kadar rendah, melalui penelitian sebelumnya oleh Hendri (2015) dan Noegroho (2016),
tidak ekonomis untuk dilebur menjadi ferromangan 􀁇􀁈􀁑􀁊􀁄􀁑􀀃􀀰􀁑􀀃􀂕􀀙􀀓􀀈􀀃􀁖􀁈􀁋􀁌􀁑􀁊􀁊􀁄􀀃􀁅􀁌􀁍􀁌􀁋􀀃
mangan kadar rendah harus dibenefisiasi terlebih dahulu untuk meningkatkan kadar
mangan dan rasio Mn/Fe dalam bijih.
Bijih mangan kadar rendah pada penelitian ini merupakan bijih mangan lokal asal
Lampung dan Jawa Timur. Benefisiasi dilakukan menggunakan teknik gravity
separation dan reduction roasting selama 30 menit menggunakan 20% batu bara
dilanjutkan magnetic separation pada medan magnet ±500 gauss. Bijih mangan
dihaluskan ke dalam ukuran -20+40, -40+60, dan -60+80 mesh dan temperatur
reduction roasting divariasikan pada 500oC, 700oC, dan 900oC. Pengujian XRD dan
XRF dilakukan dalam mengarakterisasi sampel awal dan hasil.
Rasio Mn/Fe dan kadar mangan pada bijih asal Lampung masing-masing
sebesar 0,90 dan 7,83% sementara pada bijih asal Jawa Timur masing-masing sebesar
1,356 dan 18,52%. Setelah dibenefisiasi, hasil terbaik dari proses gravity separation
pada bijih Lampung tercapai pada rasio Mn/Fe 0,95 dengan kadar Mn 9,4% pada
89,75% recovery berat sementara pada bijih Jawa Timur diperoleh pada rasio Mn/Fe
3,32 dengan kadar mangan 40,48% pada 2,09% recovery berat. Selanjutnya, hasil
terbaik dari reduction roasting dilanjutkan magnetic separation pada bijih Lampung
diperoleh pada rasio Mn/Fe 1,96 dan kadar mangan 6,81% pada 36 wt% recovery,
sementara pada bijih Jawa Timur, tercapai pada rasio Mn/Fe 3,99 dan kadar mangan
34,31% pada 44 wt% recovery.

ABSTRACT
About 90% of manganese ore is utilized for ferromanganese and
ferrosilicomanganese production as alloying metal in the steel making process. The
addition of manganese in the form of ferromanganese to the steel making process is
able to increase hardness and toughness of steel. Ferromanganese is obtained from the
metallurgical grade manganese ore processing through the smelting process. Low grade
manganese ore, according to the previous research from Hendri (2015) and Noegroho
(2016), was not economic for direct smelting to obtain ferromanganese with Mn 􀂕􀀙􀀓􀀈􀀑􀀃
Therefore, low grade manganese ore must be beneficiate first to enhance the
manganese grade and its ratio.
Low grade manganese ore in this research are a local ore from Lampung and
East Java. The steps on the beneficiation process are including gravity separation and
reduction roasting for 30 minutes using 20% of coal followed by magnetic separation
at the magnetic intensity of ±500 Gauss. The particle size was reduced into -20+40, -
40+60, and -60+80 mesh and the temperature of reduction roasting was varied at 500oC,
700oC, and 900oC. XRD and XRF testing was conducted for the characterization of ore
and the sample results.
Mn/Fe ratio and manganese content in Lampung ore is respectively 0.9 and
7.83%, while in East Java ore is respectively 1.356 and 18.52%. After beneficiation,
the best results from gravity separation of Lampung ore was obtained at 0.95 of Mn/Fe
ratio and 9.4% of manganese content at 89.75% of weight recovery, while in East Java
ore was obtained at 3.32 of Mn/Fe ratio and 40.48% of manganese content at 2.09% of
weight recovery. Then, the best results of reduction roasting followed by magnetic
separation of Lampung ore was obtained at 1.96 of Mn/Fe ratio and 6.81% of
manganese content at 36% of weight recovery, while in East Java ore was obtained at
3.99 of Mn/Fe ratio and 34.31% of manganese content at 44% weight recovery.

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 Metadata

No. Panggil : S63231
Entri utama-Nama orang :
Entri tambahan-Nama orang :
Entri tambahan-Nama badan :
Subjek :
Penerbitan : [Place of publication not identified]: [Publisher not identified], 2016
Program Studi :
Bahasa : ind
Sumber Pengatalogan : LibUI ind rda
Tipe Konten : text
Tipe Media : unmediated ; computer
Tipe Carrier : volume ; online resource
Deskripsi Fisik : xvi, 74 pages : illustration ; 30 cm + apenndix
Naskah Ringkas :
Lembaga Pemilik : Universitas Indonesia
Lokasi : Perpustakaan UI, Lantai 3
  • Ketersediaan
  • Ulasan
No. Panggil No. Barkod Ketersediaan
S63231 14-18-096959143 TERSEDIA
Ulasan:
Tidak ada ulasan pada koleksi ini: 20430437