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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 8 Documents
 1 
Search results for , issue "(August 2025)" : 8 Documents clear
Effect of Particle Size and pH on Recovery of Gold with Bottle Roll Test Method at PT Citra Palu Minerals Sari, Rayska Hayu Randana; Prayuditha, Margaretha
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.v5i2.13529

Abstract

Bottle Roll Test (BRT) is a leaching testing method on a laboratory scale used in this test. The sample tested was low grade gold ore (< 1 ppm Au) from Poboya, Palu, Central Sulawesi at PT Citra Palu Minerals. Leaching was carried out for 24 hours with samples taken at 2, 4, 6, 12, and 24 hours. The parameters tested were particle size (-125 +100 µm, -100 +75 µm, and -75 µm), and pH (10-11, 11-12, and 12-13). The parameters set are 48% solid percent, 300 ppm cyanide concentration, dissolved oxygen using free air, 50 RPM agitation speed, and 24 hours leaching residence time. The research results showed that the highest gold recovery was obtained in samples with particle size of -75 µm and a pH of 10-11. The highest gold recovery is 91,5%.
The Effect of Cyanide Concentration and Grinding Time in Tailings on %Extraction at PT. Agincourt Resources Rakatta Banurea, Andromeda Sanjesti; Nahdi, Sabrina Almasari; Wahyuningsih, Tri
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.v5i2.13944

Abstract

This study aims to analyze the effect of cyanide concentration and ore grinding on the extraction of gold and silver. The tests were conducted on three different samples, including samples without grinding and samples with grinding sized untill 75 µm. The results of the Atomic Absorption Spectroscopy (AAS) test showed that gold content decreased in all samples, while silver content tended to increase. For the Grinding Time test used to achieve a P80 particle size (where 80% of particles pass through a sieve at certain size), it was found that the optimal time to reach 75 µm was 18 minutes and 65 seconds. Silver extraction increased with the addition of cyanide concentration up to 1000 ppm and grinding untill 75 µm, while gold extraction remained insignificant (0%). This is likely due to the short duration of the test, which only for 2 hours using the bottle roller test method. For future tests, it is recommended to use a stir leach or magnetic stirrer with longer duration of stirring time and better control of oxygen and pH levels. The test results showed that the percentage of silver extraction was 0,82%, 3,23%, and 3,28%, respectively, while the percentage of gold extraction was 0%. The AAS test revealed that gold content ranged from 0,001 g/t to 0,003 g/t, while silver content ranged from 0,322 g/t to 0,559 g/t. The most influential parameters for increasing silver extraction were ore size reduction and the addition of cyanide concentration.
Comparative Analysis of Reagents in Gold and Silver Leaching Process Using the Bottle Roll Test Method Ardiansyah, Rizki; Wisnu Pratami, Nabila Putri; Wirasangka, Zanescaya
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.v5i2.13952

Abstract

According to Law No. 4 of 2009, mineral processing in Indonesia must be carried out domestically. Cyanide (NaCN) remains the primary reagent in gold extraction due to its efficiency, but its negative environmental impact has driven the development of more environmentally friendly alternative reagents, such as thiosulfate and thiocyanate. This study aims to compare three types of reagents, namely NaCN, EG, and LW, in the gold and silver leaching process using the Bottle Roll Test method. The results show that LW achieved the highest gold extraction rate of 94%, followed by NaCN at 92% and EG at 88%. The best reaction kinetics were observed with LW, which reached maximum extraction within 8 hours. In terms of cost, NaCN was the most economical at 11.29 USD/ton of ore, lower than EG at 12.89 USD/ton and LW at 222.82 USD/ton. This study provides guidance for the gold mining industry in selecting the optimal leaching reagent based on extraction efficiency and cost-effectiveness.
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.

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