Pengaruh Rasio Fluks High Kalsium Karbonat (CaCO3) Dan Fluks Kalsium Hidroksida (Ca(OH)2) Terhadap Penurunan Persentase Mangan Pada Peleburan Campuran Skrap Baja

Sahputro, Ferry Dwi (2025) Pengaruh Rasio Fluks High Kalsium Karbonat (CaCO3) Dan Fluks Kalsium Hidroksida (Ca(OH)2) Terhadap Penurunan Persentase Mangan Pada Peleburan Campuran Skrap Baja. Other thesis, InstitutTeknologi Sepuluh Nopember.

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Abstract

Industri peleburan logam memegang peranan penting dalam pembuatan komponen kendaraan bermotor. Pada proses peleburan, umumnya digunakan skrap baja sebagai bahan baku utama dan produk akhirnya berupa besi cor nodular. Skrap baja yang digunakan memiliki kandungan Mn tinggi sekitar 0,70–0,71 wt%, sehingga produk besi cor menunjukkan kekerasan mekanik yang tinggi. Kekerasan yang terlalu tinggi dapat menimbulkan retakan saat pemakaian. Penelitian ini dilakukan untuk menganalisis pengaruh variasi konsentrasi fluks CaCO3 dan Ca(OH)₂ terhadap penurunan kadar Mn pada skrap baja (target 0,20–0,40 wt% Mn), menganalisis karakteristik slag yang dihasilkan oleh penambahan fluks campuran CaCO3 dan Ca(OH)₂, serta menganalisis perhitungan kesetimbangan massa, kesetimbangan energi, dan biaya produksi pada skala industri dengan fluks campuran CaCO3 dan Ca(OH)₂. Metode yang dalam penelitian ini adalah peleburan skrap baja sebanyak 250 gram pada tungku induksi, dengan variasi komposisi skrap (100%, 75%, 50%, 25% skrap baja high Mn) dan penambahan fluks campuran CaCO3 dan Ca(OH)₂ sebesar 2%, 4%, dan 6%. Hasil analisa XRD slag menunjukkan bahwa CaCO3 dan Ca(OH)₂ terdekomposisi menjadi CaO yang membentuk senyawa kompleks dengan Mn, seperti Ca4Mn3O10 dan CaCu3Mn4O12. Pada hasil pengujian XRF diperoleh kandungan CaO dalam slag mencapai 45,15%, menandakan slag yang dihasilkan memiliki potensi pemanfaatannya untuk material konstruksi. Penambahan fluks 2% menghasilkan kadar Mn akhir 0,28 wt% yang paling mendekati standar industri (0,20 – 0,40 wt%) dan memberikan efisiensi biaya tertinggi dibandingkan variasi lainnya.
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The metal smelting industry plays an important role in the manufacture of motor vehicle components. In the smelting process, steel scrap is generally used as the main raw material and the final product is nodular cast iron. The steel scrap used has a high Mn content of around 0.70–0.71 wt%, so that the cast iron product exhibits high mechanical hardness. Excessive hardness can cause cracks during use. This study was conducted to analyze the effect of varying concentrations of CaCO₃ and Ca(OH)₂ flux on reducing the Mn content in steel scrap (target 0.20–0.40 wt% Mn), analyzing the characteristics of slag produced by the addition of a mixture of CaCO₃ and Ca(OH)₂ flux, and analyzing mass balance calculations, energy balance, and production costs on an industrial scale using a mixture of CaCO₃ and Ca(OH)₂ flux. The method used in this study was the melting of 250 grams of steel scrap in an induction furnace, with variations in scrap composition (100%, 75%, 50%, 25% high Mn steel scrap) and the addition of CaCO₃ and Ca(OH)₂ flux at 2%, 4%, and 6%. XRD analysis results showed that CaCO₃ and Ca(OH)₂ decomposed into CaO, forming complex compounds with Mn, such as Ca₄Mn3O10 and CaCu₃Mn₄O₁₂. XRF testing results indicated that the CaO content in the slag reached 45.15%, indicating that the produced slag has potential for use as construction material. The addition of 2% flux resulted in a final Mn content of 0.28 wt%, which is closest to the industry standard (0.20 – 0,40 wt%) and provides the highest cost efficiency compared to other variations.

Item Type:	Thesis (Other)
Uncontrolled Keywords:	CaCO3, Ca(OH)2, Cast Iron, Induction Furnace, Mangan, Skrap baja, CaCO3, Ca(OH)2, Cast Iron, Induction Furnace, Mangan, Skrap baja
Subjects:	T Technology > TS Manufactures > TS253 Die-Casting 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:	Ferry Dwi Sahputro
Date Deposited:	30 Jul 2025 10:08
Last Modified:	30 Jul 2025 10:08
URI:	http://repository.its.ac.id/id/eprint/123978

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