Studi Pengaruh Variasi Ketebalan Lapisan Burden Material Pada Pengolahan Bijih Nikel Laterit Di Mini Blast Furnace Terhadap Fenomena Transfer Momentum Menggunakan Finite Volume Method

Aswin, Rahmania Agustin (2017) Studi Pengaruh Variasi Ketebalan Lapisan Burden Material Pada Pengolahan Bijih Nikel Laterit Di Mini Blast Furnace Terhadap Fenomena Transfer Momentum Menggunakan Finite Volume Method. Undergraduate thesis, Institut Teknologi Sepuluh Nopember.

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Abstract

Pengolahan bijih nikel laterit yang menggunakan mini blast furnace (MBF), dengan produk akhir nickel pig iron (NPI), adalah proses bertemperatur tinggi yang melibatkan susunan bergantian dari material umpan. Perbedaan profil susunan, yang salah satunya berupa ketebalan lapisan material, berpengaruh pada proses di dalam MBF. Pada penelitian ini, studi pengaruh variasi ketebalan lapisan tersebut dilakukan untuk mengetahui dampaknya terhadap transfer momentum di dalam MBF, yang berujung pada produktivitas reaktor. Penelitian dilakukan menggunakan computational fluid dynamic (CFD) berbasis kontrol volum. MBF Departemen Teknik Material dan Metalurgi dengan working volume 61 m3 dan kapasitas 250 ton laterit per hari digunakan sebagai model. Simulasi terbagi menjadi dua jenis yaitu simulasi satu lapis dan simulasi MBF penuh. Simulasi satu lapis menunjukkan pengaruh variasi ketebalan terhadap kecepatan aliran gas dan pressure drop. Simulasi MBF penuh menggambarkan dampak perubahan transfer momentum terhadap keseluruhan proses ekstraksi, dianalisa melalui literatur. Semakin tebal lapisan material, nilai kecepatan gas cenderung tetap, namun aliran gas semakin terhambat sehingga pressure drop meningkat. Lapisan material yang tipis harus didampingi porositas memadai untuk pressure drop yang ideal. Berdasarkan literatur, penggunaan lapisan tipis paling tepat karena pressure drop bernilai minimum sehingga produktivitas reaktor bernilai maksimum, dengan nilai ketebalan 17 cm untuk batubara, 20 cm untuk laterit, dan 12 cm untuk dolomit. ====================================================================== Nickel laterite extraction using mini blast furnace (MBF) produce nickel pig iron (NPI) as the final product, so it undergoes high temperature processing and also involves stacks of burden material creating alternating layered burden. Different profile of the stacks, thickness of layer for example, affects the whole process. In this research, a study about the effect the thickness variation is done regarding its influence toward momentum transfer inside MBF, thus indicating its productivity. Computational fluid dynamic (CFD) based on finite volume method is used. MBF owned by Department of Materials and Metallurgical Engineering (working volume of 61 m3, 250 tons of laterite per day) is used as main model. There are two types of simulation: single layer and multilayer simulation. The former shows relation among layer thickness, gas velocity field, and pressure drop. The latter predicts the influence of difference of the relation toward momentum transfer inside the reactor, analyzed based on literature. It is known that the thicker the layer, gas velocity tends to be constant, but its resistance along the bed increases, leading to higher pressure drop. Thinner layer must be accompanied with proper value of porosity for ideal pressure drop. Based on literature, thinner layer fits the best for productivity because of it produces low pressure drop. Thus the best value of thickness for the MBF is 17 cm for coal, 20 cm for laterite, and 12 cm for dolomite.

Item Type: Thesis (Undergraduate)
Additional Information: RSMt 669.733 2 Asw s
Uncontrolled Keywords: layer thickness, kecepatan gas, produktivitas furnace, transfer momentum, gas velocity, furnace productivity , momentum transfer
Subjects: T Technology > TA Engineering (General). Civil engineering (General) > TA347 Finite Element Method
T Technology > TN Mining engineering. Metallurgy
Divisions: Faculty of Industrial Technology > Material & Metallurgical Engineering > (S1) Undergraduate Theses
Depositing User: Rahmania Agustin Aswin
Date Deposited: 19 Sep 2017 07:52
Last Modified: 27 Dec 2017 05:07
URI: http://repository.its.ac.id/id/eprint/42798

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