Analisa Pengaruh Persentase Massa Limestone Terhadap Kadar Ni, Kekuatan, dan Perolehan Sinter Pada Proses Sintering Bijih Nikel Laterit

Ramdhani, Ibrahim Ali (2019) Analisa Pengaruh Persentase Massa Limestone Terhadap Kadar Ni, Kekuatan, dan Perolehan Sinter Pada Proses Sintering Bijih Nikel Laterit. Other thesis, Institut Teknologi Sepuluh Nopember.

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Abstract

Tingginya produksi stainless steel menyebabkan konsumsi nikel berkadar rendah meningkat pesat di dunia. Namun belum ada proses yang optimal untuk mengolah nikel dengan kadar rendah tersebut. Salah satu proses alternatif yang kini dikembangkan yakni sintering-blast furnace untuk produksi feronikel. Proses sintering dilakukan untuk memenuhi spesifikasi material umpan yang dibutuhkan dalam operasi blast furnace, antara lain perolehan dan kekuatan sinter. Perolehan dan kekuatan sinter dipengaruhi oleh berbagai macam faktor, salah satunya adalah fluks.. Salah satu jenis fluks yang banyak tersedia di Indonesia adalah limestone. Limestone memiliki kandungan CaCO3 yang berfungsi sebagai pembentuk ikatan slag selama proses sintering berlangsung. Sehingga dilakukan penelitian sintering dengan memvariasikan massa limestone. Penelitian ini dilakukan dengan sintering bijih nikel laterit menggunakan bahan bakar arang dan fluks limestone. Kebutuhan arang dan limestone dihitung menggunakan neraca panas dan neraca massa, kemudian massa limestone divariasikan pada 22%, 26,5%, dan 31% dari material umpan. Material umpan dimasukkan dalam bed furnace, lalu dipanaskan hingga temperatur 1200oC selama 4 jam. Selanjutnya dilakukan perhitungan perolehan sinter dan pengujian EDX, XRD serta Drop test untuk mengetahui kadar Ni, senyawa dalam sinter dan kekuatan sinter. Kadar Ni tertinggi didapatkan pada variasi 22% yakni 2,8%. Kekuatan sinter tertinggi didapatkan pada variasi 26,5% yakni 68,85%. Sinter Yield tertinggi didapatkan pada variasi 31% yakni 69,14%. Senyawa yang terbentuk pada sinter adalah pyroxene, olivine, nickel iron oxide, magnesio chromite, magnetite, quartz, dan spinel. Senyawa dicalcium cilicate hanya teridentifikasi pada variasi persentase massa limestone 26,5% dan 31%.
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The high production of stainless steel causes the consumption of low-grade nickel in the world increase. However, there is no optimal process for processing low-grade nickel. The alternative process that is now being developed is a sintering-blast furnace for produce ferronickel. The sintering process carried out to fulfill the specification of the feed materials needed in blast furnace operations, including sinter productivity and sinter strength. This productivity and strength are influenced by various factors, one of which is flux. One type fof flux that is widely available in Indonesia is limestone. Limestone contains CaCO3 which has function as slag bonds forming during the sintering process. So that the sintering research is mus done by varying the mass of limestone. This research was conducted by sintering laterite nickel ore using charcoal as a fuel and limestone as a flux. According to the calculation of charcoal and limestone requirements, it uses heat balance and mass balance, then the mass of limestone is varied at 22%, 26,5%, and 31% of the feed materials. Feed materials are put in to the furnace, then heated to a temperature of 1200oC during 4 hours. Next, calculating productivity of sinter, doing an EDX, XRD, and Drop testing to determine the Ni content, compound of sinter, and sinter strength. The highest Ni content is obtained at the 22% variabel which is 2,8%. The highest sinter strength was obtained at the 26,5% variabel wich is 68,85%. The highest sinter yield was obtained at the 31% variable which is 69,14%. The compound formed pyroxene, olivine, nickel iron oxide, magnesio chromite, magnetite, quartz, dan spinel. Dicalcium cilicate identified in 26,5% and 31% mass of limestone.

Item Type:	Thesis (Other)
Uncontrolled Keywords:	Sintering, Laterite Nickel, Limestone, Sinter Strength, Sinter Yield
Subjects:	T Technology > TN Mining engineering. Metallurgy > TN677 Blast furnaces.
Divisions:	Faculty of Industrial Technology > Material & Metallurgical Engineering > 28201-(S1) Undergraduate Thesis
Depositing User:	Ibrahim Ali Ramdhani
Date Deposited:	22 Jul 2026 06:32
Last Modified:	22 Jul 2026 06:32
URI:	http://repository.its.ac.id/id/eprint/65428

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