Pengaruh Penambahan Fluks Kalsium Karbonat (Caco3) Terhadap Penurunan Persentase Mangan Pada Peleburan Campuran Skrap Baja

Nugraha, Husen (2025) Pengaruh Penambahan Fluks Kalsium Karbonat (Caco3) Terhadap Penurunan Persentase Mangan Pada Peleburan Campuran Skrap Baja. Other thesis, Institut Teknologi Sepuluh Nopember.

Text 5011211136-Undergraduate_Thesis.pdf - Accepted Version Restricted to Repository staff only Download (4MB) | Request a copy

Abstract

Industri peleburan logam memegang peranan penting dalam pembuatan komponen kendaraan bermotor, dengan skrap baja sebagai bahan baku utama. Namun, kandungan mangan (Mn) tinggi pada skrap, sekitar 0,70-0,71 wt%, dapat meningkatkan kekerasan produk akhir secara signifikan dan berisiko menyebabkan retak saat pemakaian. Penelitian ini bertujuan untuk menganalisis pengaruh variasi fluks kalsium karbonat (CaCO3) terhadap penurunan kadar Mn dalam skrap baja, menganalisis karakteristik slag hasil peleburan, serta mengevaluasi kesetimbangan massa, energi, dan estimasi biaya produksi pada skala industri. Proses peleburan dilakukan dalam tungku induksi berkapasitas 250 gram dengan variasi skrap high Mn dari 100% hingga 25% serta penambahan fluks CaCO3 sebesar 2%, 4%, dan 6%. Hasil X-Ray Diffraction (XRD) menunjukkan fluks CaCO3 terdekomposisi menjadi CaO yang bereaksi dengan Mn membentuk senyawa kompleks seperti Ca2FeMnO5 , CaMnO6Si2, dan CaMnO3. Analisis X-Ray Fluorescence (XRF) menunjukkan slag mengandung CaO sebesar 45,15%, yang berpotensi dimanfaatkan sebagai material konstruksi. Penambahan fluks CaCO3 sebesar 2% menghasilkan kadar Mn akhir sebesar 0,31 wt%, masuk dalam rentang standar industri (0,20–0,40 wt%) dan menunjukkan efisiensi biaya tertinggi. Hasil ini membuktikan bahwa penggunaan fluks CaCO3 dalam kadar optimum dapat menjadi solusi efektif untuk menurunkan kadar Mn dalam proses peleburan skrap baja.
====================================================================================================================================
The metal smelting industry plays a vital role in manufacturing automotive components, with steel scrap serving as the primary raw material. However, high manganese (Mn) content in scrap, approximately 0.70–0.71 wt%, can significantly increase the mechanical hardness of the final product, posing a risk of cracking during service. This study aims to analyze the effect of varying calcium carbonate (CaCO3) flux concentrations on Mn reduction in steel scrap, examine the characteristics of the resulting slag, and evaluate mass balance, energy balance, and production cost estimates on an industrial scale. The smelting process was conducted using a 250 gram capacity induction furnace, with high-Mn scrap composition ranging from 100% to 25% and CaCO3 flux additions of 2%, 4%, and 6%. X-Ray Diffraction (XRD) analysis confirmed that CaCO3 decomposed into CaO, which reacted with Mn to form complex compounds such as Ca2FeMnO5, CaMnO6Si2, dan CaMnO3. X-Ray Fluorescence (XRF) results showed that the slag contained 45.15% CaO, indicating potential reuse as construction material. The addition of 2% CaCO3 flux resulted in a final Mn content of 0.31 wt%, within the industrial standard range (0.20–0.40 wt%) and achieved the highest cost efficiency. These findings demonstrate that optimal CaCO₃ addition can be an effective solution for Mn reduction in high-Mn steel scrap smelting.

Item Type:	Thesis (Other)
Uncontrolled Keywords:	Besi Tuang, Fluks, Kalsium Karbonat, Mangan, Peleburan, Skrap Baja, Cast Iron, Flux, Calcium Carbonate, Manganese, Smelting, Steel Scrap
Subjects:	T Technology > TN Mining engineering. Metallurgy T Technology > TN Mining engineering. Metallurgy > TN687 Electric furnaces. T Technology > TP Chemical technology T Technology > TP Chemical technology > TP155.7 Chemical processes. T Technology > TP Chemical technology > TP245.C3 Calcium carbonate. T Technology > TS Manufactures T Technology > TS Manufactures > TS320 Steel--Metallurgy.
Divisions:	Faculty of Industrial Technology and Systems Engineering (INDSYS) > Material & Metallurgical Engineering > 28201-(S1) Undergraduate Thesis
Depositing User:	Husen Nugraha
Date Deposited:	30 Jul 2025 09:25
Last Modified:	30 Jul 2025 09:25
URI:	http://repository.its.ac.id/id/eprint/123261

Actions (login required)

View Item