Studi Post-Mortem High Alumina Refractory Brick pada Roof Electric Arc Furnace (EAF) di Industri Smelter Nikel

Alfriyansyah, Luthfy Danu (2025) Studi Post-Mortem High Alumina Refractory Brick pada Roof Electric Arc Furnace (EAF) di Industri Smelter Nikel. Other thesis, Institut Teknologi Sepuluh Nopember.

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Abstract

Pada industri pengolahan nikel, material refraktori sangat dibutuhkan dalam berbagai hal. Secara umum, material refraktori ini digunakan pada berbagai jenis alat seperti Electric Arc Funace (EAF) sebagai lapisan pelindung untuk menahan panas agar tidak keluar dari sistem operasi. Dengan kondisi yang ekstrem, tidak jarang material refraktori mengalami kegagalan. Satu di antara kegagalan yang sering terjadi yaitu kerusakan struktur pada bagian atap EAF. Penelitian ini bertujuan untuk menganalisis penyebab degradasi dari refraktori dan menganalisis mekanisme degradasi yang terjadi. Pengujian XRF menunjukkan terjadi penurunan signifikan pada Al2O3 dan SiO2 yang merupakan komposisi utama dari refraktori. Penurunan kadar CaO pada hasil XRF mengidentifikasikan bahwa terjadi korosi refraktori karena menyebabkan penurunan kadar Al2O3 dan SiO2. Pengujian XRD menunjukkan fasa utama dari refraktori berupa mullite, seiring penggunaanya terjadi transformasi fasa dan pembentukan fasa baru akibat terkena beban termal. Berdasarkan pengujian SEM-EDX-Mapping menunjukkan fasa mullite berbentuk needle-like mengalami perubahan pada sampel failure yang sudah tertutup oleh slag. Berdasarkan pengujian TMA refraktori memiliki kestabilan termal yang baik karena CTE yang kecil. Berdasarkan pengujian CCS, refraktori memiliki kekuatan untuk menahan beban yang baik juga. Hasil dari simulasi factsage menunjukkan bahwa interaksi kimia antara refraktori dengan slag akan membentuk fasa baru yang bersifat destruktif pada temperatur >1200°C.
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Refractory materials are essential in the nickel smelting industry for various applications. Generally, these materials are used in different types of equipment, such as in the Electric Arc Furnace (EAF), where it serve as protective linings to retain heat within the operational system. Under the extreme conditions, refractory materials are often subjected to failure mechanisms. One of the most common failures is structural damage in the roof section of the EAF. This research aims to analyze the degradation of refractories and analyze the degradation mechanism that occurs through various tests. XRF testing showed a significant decrease in Al2O3 which is the main composition of the refractory. XRD testing shows the main phase of the refractory is mullite, along with the use of phase transformation and the formation of new phases due to thermal load. Based on SEM-EDX-Mapping testing, it shows that the mullite phase is needle-like and changes in the failure sample that covered by slag. Based on TMA testing, the refractory has good thermal stability due to small CTE. Based on CCS testing, the refractory has good load-bearing strength as well. The results of factsage simulation show that the chemical interaction between refractory and slag will form a new phase that is destructive at temperatures >1200°C.

Item Type:	Thesis (Other)
Uncontrolled Keywords:	Degradasi Material, Electric Arc Furnace, High Alumina Refractory, Electric Arc Furnace, High Alumina Refractory, Material Degradation.
Subjects:	T Technology > TA Engineering (General). Civil engineering (General) > TA169.5 Failure analysis T Technology > TN Mining engineering. Metallurgy > TN687 Electric furnaces.
Divisions:	Faculty of Industrial Technology and Systems Engineering (INDSYS) > Material & Metallurgical Engineering > 28201-(S1) Undergraduate Thesis
Depositing User:	Luthfy Danu Alfriyansyah
Date Deposited:	31 Jul 2025 06:53
Last Modified:	31 Jul 2025 06:53
URI:	http://repository.its.ac.id/id/eprint/125107

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