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Journal of Metallurgical Engineering and Processing Technology
Published by Universitas Pembangunan Nasional Veteran Yogyakarta
ISSN : 27236854     EISSN : 27981037     DOI : https://doi.org/10.31315/jmept
Core Subject : Science, Engineering,
Chemical Engineering, Chemistry & Bioengineering Energy Engineering Materials Science & Nanotechnology Mechanical Engineering
Journal of Metallurgical Engineering and Processing Technology diterbitkan oleh Program Studi Teknik Metalurgi, Fakultas Teknologi Mineral, Universitas Pembangunan Nasional "Veteran" Yogyakarta. Journal of Metallurgical Engineering and Processing Technology terbit dua kali dalam satu tahun, yaitu Februari dan Agustus. Fokus dan ruang lingkup Journal of Metallurgical Engineering and Processing Technology adalah Pengolahan Mineral, Batubara, Metalurgi Ekstrasi, Metalurgi Fisika, Metalurgi Mekanik, dan Pengelolaan Mineral
Arjuna Subject : Teknik (semua kategori) - Teknik (Lain-Lain)
Articles 129 Documents
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Study of Laterite Iron Ore Extraction by Smelting Method using Electric Arc Furnace Wijayanti, Luluk Nofitasari; Choirunnisa, Aura Shafa; Azizi, Matrix Faqih
Journal of Metallurgical Engineering and Processing Technology (August 2025)
Publisher : Universitas Pembangunan Nasional "Veteran" Yogyakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31315/jmept.v5i2.13955

Abstract

Laterite iron ore resources have enormous potential. Laterite iron ore is the main material for iron and steel production in Indonesia, with reserves estimated at 1,391 million MT and Fe content between 40% and 56%. The processing and extraction of laterite iron ore carried out in this study used the Electric Arc Furnace (EAF) method. The processing process includes the stages of drying, crushing, mixing (two-stage mixing), sintering, reheating, and smelting. In the sintering and smelting processes, BCI semi coke is used as a reductant and energy source. While lime is used to help bind impurity minerals into slag. The selection of the EAF method is based on its advantages in energy efficiency and the ability to use more diverse raw materials. EAF can also produce high-quality products and has better environmental control than technologies such as blast furnaces. The variation in the composition of BCI semi coke and lime used in this experiment affects the final Fe content in the pig iron produced. The right process and using the appropriate material composition, pig iron with high Fe content can be obtained. The highest Fe content in the research conducted was 94.43%. 
Analysis of the Effect of Tuyere Angle on Velocity and Temperature Distribution in a Blast Furnace Using Computational Fluid Dynamics Method Bahiy, Oktavian Khayyan; Abdul Shaleh, Mansyur
Journal of Metallurgical Engineering and Processing Technology (August 2025)
Publisher : Universitas Pembangunan Nasional "Veteran" Yogyakarta

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Abstract

This study aims to explore the impact of tuyere angle variation on velocity and temperature distribution in a blast furnace using Computational Fluid Dynamics (CFD) methods. The tuyere angles analyzed in this research include 4°, 6°, 8°, and 10°. Understanding the resulting velocity and temperature distributions from these variations is crucial in metallurgical processes, as it directly affects thermal efficiency and the quality of the end product. Simulation results revealed that increasing the tuyere angle from 4° to 8° led to more stable and uniform airflow patterns, as well as optimal heat distribution. However, when the tuyere angle was further increased to 10°, there was a noticeable instability in airflow and temperature distribution, which resulted in a decrease in process efficiency. This indicates a direct correlation between the increase in tuyere angle and flow stability up to the optimal point at 8°, beyond which performance declines. The study concludes that an 8° tuyere angle is the most ideal for use in blast furnaces, as it provides the most efficient heat distribution and airflow.
Analisis Perbandingan Material S45C Dan JSC270C Pada Proses Gas Soft Nitriding Dan Isonite Terhadap Surface Hardness, Compound Layer, Distribution Layer, Dan Struktur Mikro Marshanda, Deviana Dewi; Prabowo , Imam; Theresia , Thia
Journal of Metallurgical Engineering and Processing Technology (August 2025)
Publisher : Universitas Pembangunan Nasional "Veteran" Yogyakarta

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Abstract

This research investigates the comparative effects of Gas Soft Nitriding (GSN) and Isonite surface treatment processes on two types of steel materials: S45C and JSC270C. Conducted at PT Parker Metal Treatment Indonesia, the study aims to analyze how these treatments influence surface hardness, compound layers, diffusion layers, and microstructure. A series of laboratory and field experiments were carried out, including micro-Vickers hardness testing and optical microscopy, to evaluate the mechanical enhancements and structural changes post-treatment. Results indicate that Gas Soft Nitriding generally produces a thicker compound layer and higher surface hardness compared to Isonite. However, the effectiveness of each process depends significantly on the material type and specific treatment parameters. These findings provide practical insight for industrial applications seeking to enhance wear resistance and surface performance of steel components through optimized thermochemical processes.
Analysis of the Effect of Increasing Sn²⁺ Content in the Electrolyte Solution from Leaching on the Recovery of the Electrorefining Process at PT. Timah Tbk: Analisis Pengaruh Peningkatan Kandungan Sn²⁺ Pada Larutan Elektrolit Hasil Pelindian Terhadap Recovery Proses Elektrorefining di PT. Timah Tbk Ihsanuddin, Muhammad Rifqi; Saputri, Andeliani; Cahyani, Desi
Journal of Metallurgical Engineering and Processing Technology (August 2025)
Publisher : Universitas Pembangunan Nasional "Veteran" Yogyakarta

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Abstract

Iron tin in this study is one of the by-products from the flame oven. This iron tin undergoes testing, yielding Sn content of 40.85% and Fe content of 31.32%. Tin Crystal is a product of pyrorefining, a process where tin is separated from various impurities such as As, Ni, Pb, Fe, among others. The study involves leaching process using 37% HCl solvent with varied volumes. From the leaching process, SnCl2 is obtained containing Sn2+. This solution undergoes titration to determine the Sn content. Subsequently, SnCl2 solution is added to an initial electrolyte solution containing 22 g/l to increase Sn2+ concentration. Electrorefining experiments were conducted using electrolyte solutions: PT Timah Tbk electrolyte, electrolyte with leaching solution 1, electrolyte with leaching solutions 1 and 2, and electrolyte with Tin Crystal leaching solution. Conditions included fixed parameters: voltage at 0.24V, experiment duration of 8 hours with hourly checks. Electrorefining process mirrored PT Timah Tbk's refining process, optimizing with 0.24V voltage for best results. Research findings showed leaching process produces SnCl2 solutions containing 80 to 130 g/l for iron tin (FeSn) samples and 150 g/l for Tin Crystal samples. Electrorefining yielded products of varying weights depending on Sn2+ concentration in the electrolyte. Quality differences were significant, suggesting the need for optimization towards superior products.
Pengaruh Tempering Baja Paduan AISI 4140 terhadap Strukturmikro, Kekerasan, dan Kekuatan Tarik muhammad, Syukron; Efriandi, Irsyadi Farhan
Journal of Metallurgical Engineering and Processing Technology (August 2025)
Publisher : Universitas Pembangunan Nasional "Veteran" Yogyakarta

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Abstract

AISI 4140 steel is a low alloy steel which is also categorized as chromium-molybdenum steel, and it is widely used to make automotive components. Based on carbon composition, AISI 4140 steel is included in the medium carbon steel with 0.4 wt.% carbon. Therefore, the mechanical properties of AISI 4140 steel can be improved by heat treatment. The AISI 4140 specimens undergoes several stages of heat treatment, austenitized at 850°C for 30 minutes, then quenched in oil. After that each specimens is tempered at two temperatures of 400°C and 500°C with holding time of 15 and 30 minutes. The heat treatment process results in increased strength and hardness but lower in ductility than that of the as-received specimen. The optimum result is obtained at tempering temperature of 500°C with holding time of 15 minutes, which shows a significant increase in tensile strength without sacrificing ductility. Finally, the microstructure of the as-received AISI 4140 steel plate shows the presence of α-ferrite and pearlite phases, while the heat-treated specimens may form martensite or tempered martensite and retained austenite.
Analysis Of Tensile Strenghth Coconut Coir Fiber Composit Using The Vaccum Bagging Method Ilhami, Zaqi Arya Zullfawas; Setiawan, Ferry; Sehono, Sehono
Journal of Metallurgical Engineering and Processing Technology Vol 5, No 1 (August 2024)
Publisher : Universitas Pembangunan Nasional "Veteran" Yogyakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31315/jmept.v5i1.10524

Abstract

Abstract The utilization of coconut fiber currently is limited to making brooms or for burning, necessitating further applications. One of these applications is its use as a reinforcement in composites, enhancing utility value and environmental friendliness. This study focuses on crafting composites from coconut fiber with variations in fiber orientation: random, 0°, and 45°.Tensile testing results reveal that the random fiber orientation variation exhibits the best performance, with a stress of 27.30 MPa, attributed to higher density. The 45° fiber orientation variation has the lowest stress (24.23 MPa) due to a lower fiber count. In bending tests, the random fiber orientation variation again performs the best, with a bending stress of 120 MPa, attributed to its high density that strengthens the structure. The 0° fiber orientation has the lowest bending stress (88.59 MPa) due to lower fiber density.Overall, utilizing coconut fiber as reinforcement in composites shows promising positive outcomes, with the random fiber orientation variation providing the best mechanical performance. This endeavor holds the potential to enhance the economic and ecological value of coconut fiber.Keywords: Composite, fiber, coconut, tensile, bending
Optimization Flotation Process Using Two Types of Collectors at PT. Florrea Indonesia Triandika, Taufan; Sukamto, Untung; Sudaryanto, Sudaryanto; Amalia, Yasmina; Allya Zulfa Suratinoyo, Zahna
Journal of Metallurgical Engineering and Processing Technology Vol 4, No 2 (February 2024)
Publisher : Universitas Pembangunan Nasional "Veteran" Yogyakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31315/jmept.v4i2.10897

Abstract

The tailings slurry used in this research originated from company X in Kuala Lipis, Pahang, Malaysia. The primary objective of this study is to determine the percentage of recovery, concentrate content, and Au concentration ratio in the tailings slurry. The research employs a quantitative method involving flotation testing. The flotation process involved two sets of experiments: one without the FX2 collector (tests 1 and 2) and another using both the F7042W and FX2 collectors (tests 3 and 4). dxThe research findings revealed that the percentage of Au recovery in single-collector flotation using FX2 (test 1) was 56.47%, with a concentration ratio of 19.78. In test 2, it was 52.59%, with a mass concentration ratio of 21.57. Meanwhile, the percentage of Au recovery in dual-collector flotation using F7042W and FX2 (test 3) was 68.77%, with a concentration ratio of 16.55, and in test 4, it was 69.45%, with a concentration ratio of 16.93. Based on the results of this research, it can be concluded that the flotation process employing two collectors, namely F7042W and FX2, as investigated in this study, was successful because percent recovery, concentration ratio, and Au content in the concentrate compared to single collector flotation.
Analysis of Humic Acid Content in Reject Coal as an Organic Fertilizer in Coal Mining Reclamation Areas Nastigor Nasution, Roy; Nursanto, Edy; Ernawati, Rika; Rijalul Haq, Shofa
Journal of Metallurgical Engineering and Processing Technology Vol 4, No 2 (February 2024)
Publisher : Universitas Pembangunan Nasional "Veteran" Yogyakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31315/jmept.v4i2.11159

Abstract

An important effort to restore the productivity of degraded land is land reclamation, especially in areas where ecosystems have been destroyed. The use of organic materials that can improve soil quality is one of the methods used in the reclamation process. Humic acid, an organic component found in natural organic materials such as humus and compost, has attracted attention as an organic fertilizer material that can be used in reclamation, the aim of this research is to analyze the use of humic acid as an organic fertilizer in the reclamation process in the Spice Land area, South Kalimantan. This research was carried out through field and laboratory studies, looking at how humic acid affects the properties of degraded soil, pH, height and stem diameter. The results showed that the application of humic acid significantly improved the quality of reclaimed soil by increasing the soil's capacity to store water and increasing its fertility in addition to the physicochemical benefits, the use of humic acid helps the environment. By using it as an organic fertilizer in the reclamation process, you no longer need to use synthetic chemical fertilizers, which can have a bad impact on the environment. It also supports sustainable agricultural practices ,in reclamation, the use of humic acid as an organic fertilizer shows great potential to increase the success rate of restoration of degraded land. Consequently, this research encourages environmentally friendly practices for the restoration of damaged ecosystems and helps sustainable land management.
The Overview of Indonesia Coal Bed Methane Resources Nursanto, Edy; Rijalul Haq, Shofa; Inmarlinianto, Inmarlinianto
Journal of Metallurgical Engineering and Processing Technology Vol 4, No 2 (February 2024)
Publisher : Universitas Pembangunan Nasional "Veteran" Yogyakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31315/jmept.v4i2.11170

Abstract

Coal Bed Methane (CBM) is generated by coal layers, there is a preceding process, which is the formation of coal (coalification). Coalification begins with the burial of organic material originating from plants. The burial, lasting hundreds of millions of years, results in increasing temperatures and pressures, causing physical and chemical changes to the organic material. Methane gas, the largest component of CBM, is formed. Two processes: biogenic and thermogenic. In the early stages of coalification, biogenic methane gas is produced as a byproduct of the activities of decomposing microorganisms (anaerobic bacteria), similar to what occurs in the decomposition of organic waste.  Only about 5 to 20 percent is stored within coal. There are four mechanisms for gas storage in coal: absorption, adsorption, free gas, and gas dissolved in water.  Among these four mechanisms, adsorption is the most significant, accounting for 98 percent of the stored CBM in a combined system of micropores (coal matrix) and cleats. Coal Bed Methane resources in Indonesia can be found across South Kalimantan, East Kalimantan, Sumatra, and Java.
Gold Extraction Process with Pre-Ox Sample and Aachen Assisted Leaching (AAL) using Running Aachen Pangestu, Dedi; Wahyuningsih, Tri
Journal of Metallurgical Engineering and Processing Technology Vol 4, No 2 (February 2024)
Publisher : Universitas Pembangunan Nasional "Veteran" Yogyakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31315/jmept.v4i2.11252

Abstract

The Center for Mineral and Coal Testing is an institution that works in the field of research services on mining and mineral processing. In the mineral processing research currently being carried out there is a research project related to increasing the efficiency of the leaching process using the Aachen Reactor. The samples used in this research were refractory gold samples. The problem of reducing the effectiveness of gold leaching is that there are minerals that are still included in the associated minerals, therefore a pre-treatment process is needed to remove these associated minerals. The Aachen reactor will help increase the efficiency of the leaching process by increasing Dissolve Oxygen levels to 30 ppm. In this study, two samples were used for comparison, namely the Pre-Ox sample and the Aachen Assisted Leaching (AAL) sample.

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