Surbakti, Tommi Jaya (2018) Reduksi Langsung Bijih Nikel Laterit Limonitik Dengan Variasi Jenis Fluks (Dolomite, Limestone, Quicklime) Terhadap Kadar Ni dan Fe Serta Morfologi Menggunakan Bed Batu Bara. Undergraduate thesis, Insitut Teknologi Sepuluh Nopember.
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Abstract
Permintaan akan nikel diprediksi akan terus meningkat namun cadangan bijih nikel sulfide yang dominan digunakan dalam industry terus menurun hal ini menjadikan bijih nikel low grade laterit limonit menjadi peluang untuk pemenuhan nikel kedepannya. Baik proses pirometalurgi maupun hidrometalurgi telah diterapkan untuk mengolah bijih nikel laterit namun sampai sekarang belum ditemukannya proses yang optimal dalam pengelohan bijih nikel laterit karena kadarnya yang sangat rendah. Penelitian ini dilakukan dengan mereduksi bijih nikel laterit limonit untuk meningkatkan kadar Nikelnya dengan menggunakan gas CO hasil reaksi batu bara dengan variasi jenis fluks (dolomite, limestone, quicklime). Briket yang terdiri dari ore, batu bara, Natrium sulfat serta kanji dimasukkan ke dalam crucible bed yang terdiri dari campuran batu bara dan dolomit. Kemudian direduksi hingga temperatur 1400oC dengan waktu holding selama 6 jam. Pengujian EDX, XRD dan SEM dilakukan untuk mengetahui kadar Ni dan Fe serta morfologi hasil reduksi. Diharapkan dengan menentukan jenis fluks yang optimum mampu mengoptimalkan proses reduksi langsung dengan mendapatkan kadar dan recovery nikel tertinggi. Dari penelitian diperoleh peningkatan kadar Ni tertinggi dengan fluks limestone sebesar 21,68% namun recovery Ni tertinggi didapatkan dengan fluks dolomite sebesar 93,73%.
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Demand for nickel is predicted to continue rise but the
dominant sulfide ore reserves used in the industry
has been
decreased
,
this problem
mak
e
low grade laterite limonite nickel
ore
become
an opportunity for future nickel fulfillment. Both the
pyrometallurgical and hydrometallurgical processes have been
applied to recover the laterite nickel ore but yet no optimal
process has been found in later
iti nickel ore because of their
very low
purity
. This research was conducted by reducing the
limonite laterite nickel ore to increase its Nickel content by
using CO gas of coal reaction with variation of flux type
(dolomite, limestone, quicklime). Briquett
es consisting of ore,
coal, sodium sulphate
(as selectivity agent for Ni)
and starch
are inserted into a crucible bed consisting of a mixture of coal
and
variation type of flux.
Then
preheat in temperature 700
0
C
for 2 hours next,
reduced to a temperature o
f 1400
0
C with a
holding time of 6 hours. The EDX, XRD and SEM tests were
performed to determine the levels of Ni and Fe as well as the
morphology of the reduction. It is hoped that by determining the
optimum flux type can optimize the direct reduction proc
ess by
obtaining the highest levels and recovery of nickel. From the
research, the highest Ni content with limestone flux was 21.68%, but the highest Ni recovery was obtained with dolomite
flux of 93.73%
| Item Type: | Thesis (Undergraduate) |
|---|---|
| Additional Information: | RSMt 620.188 Sur r-1 3100018074252 |
| Uncontrolled Keywords: | Bed, Bijih limonit, Dolomite, Limestonel, Quicklime, Reduksi langsung |
| Subjects: | T Technology > TN Mining engineering. Metallurgy T Technology > TN Mining engineering. Metallurgy > TN799.N6 Nickel--Metallurgy |
| Divisions: | Faculty of Industrial Technology > Material & Metallurgical Engineering > 28201-(S1) Undergraduate Thesis |
| Depositing User: | Tommi Jaya Surbakti |
| Date Deposited: | 19 Feb 2018 07:57 |
| Last Modified: | 28 Apr 2020 06:07 |
| URI: | http://repository.its.ac.id/id/eprint/49303 |
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