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Yasmina Amalia
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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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Effect of Application Rate on Gold Ore Extraction Process with Column Test Method at PT J Resources Bolaang Mongondow, North Sulawesi Rangan, Frederico Espinoza; Sudaryanto, Sudaryanto
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.v5i1.12385

Abstract

PT J Resouces Bolaang Mongondow is engaged in gold processing with the heap leach process using the dynamic cell method. However, currently there will be a change to the static cell method so that it will affect the operational strategy including the application rate. Therefore, in this research, testwork was carried out to determine the best application rate to be used in the static cell process, studying the effect of application rate on leaching kinetics, percent gold extraction value, and cyanide consumption. The research stages include preparation and testing of head assay samples, leaching, and preparation and testing of tailings samples using the column test method. The application rate variations used were 20 L/m2 /h, a combination of 20 & 10 L/m2 /h, and 10 L/m2 /h. Pregnant leach solution obtained per day is checked for pH, free cyanide, and metal content analysis for the calculation of the percent extraction by back calculated. The results showed that the application rate of 20 L/m2 /h and the combination of 20 & 10 L/m2 /h had faster primary leaching kinetics than the application rate of 10 L/m2 /h. Analysis of the percent extraction of application rate 10 L/m2 /h has the highest percent extraction of 89% (0.2081 mg/L gold). Application rate also has an impact on cyanide consumption, where the application rate of 20 L/m2 /h has the highest cyanide consumption of 0.13 g/t. Meanwhile, the application rate combination of 20 & 10 L/m2 /h and 10 L/m2 /h had cyanide consumption of 0.081 g/t and 0.067 g/t, respectively. From the results, it is concluded that the best application rate is the combination of 20 & 10 L/m2 /h, judging from the leaching kinetics factor and the percent extraction obtained. On the other hand, the volume of solution produced is also less so that it can minimize the occurrence of landslides on the leach pad
Analysis of Dye-Penetrant Test, Tensile Test, and Bending Test Results of Shielded Metal Arc Welding (SMAW) on Carbon Steel ASTM A106 Grade B Pipes in 6G Welding Position at PPSDM Migas Cepu Setiawan, Agris; Gracella, Gracella; Hoka Padmanaba, Faqih; Alfianur Hakim, Haidar Alfianur Hakim
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.v5i1.12488

Abstract

The weld quality its significantly depends on the mechanical characteristics of weld joint, the welding process, parameters weld process and also material selection. Insufficient parameter values and welding method can lead to welding defects and distortion that adversely affect mechanical properties. Consequently, carefully selecting appropriate weld method at an optimal level becomes crucial to mitigate defects, enhance productivity, and achieve desirable mechanical attributes in shielded metal arc welding (SMAW). PPSDM Migas has special facilities for conducting welding workshops or training and for equipment inspection or testing in the metallurgy laboratory. One of the inspected items is the welding used to join pipes. In this study, the inspected pipe is Carbon Steel ASTM A106 Grade B, welded using SMAW in the 6G position from the PPSDM Migas Cepu Refinery Unit area. The inspection methods used in this study are the Dye-Penetrant Test, Tensile Test, and Bending Test to identify welding defects and material strength. The tests conducted refer to ASME Section IX. Based on the DyePenetrant Test results on the Carbon Steel ASTM A106 pipe joint, five rounded defects were found on the weld surface, still within the acceptance criteria of ASME Section IX, thus the pipe is declared accepted. According to the Tensile Test results, spesimens 1 and 2 broke in the weld area but met the ASME Section IX criteria with tensile strengths of 464.098 MPa and 713.597 MPa, respectively, both exceeding 415 MPa, which is the tensile strength of ASTM A106 carbon steel. However, the Bending Test results showed open defects up to 3 mm, causing the pipe joint to be declared declined.
A Review of Reforming Processes in the Railway Manufacturing Industry : Case Study of PT. Industri Kereta Api (Persero) Kristanta, Stephanus Yosi; Setyani, Atik; Sudaryanto, Sudaryanto; Syukron, Muhammad; Santoso, Muji
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.v5i1.12772

Abstract

The railway manufacturing industry is critical for developing efficient and sustainable mass transportation systems. PT. Industri Kereta Api (Persero) (PT. INKA), a leading company in Indonesia, faces significant challenges due to deformation caused by residual stress during welding processes. This study reviews various reforming techniques implemented by PT. INKA to address these issues. The objectives include evaluating the effectiveness of these techniques and identifying potential improvements. Methods such as post-weld heat treatment (PWHT), controlled cooling, and mechanical tools are analyzed for their ability to mitigate deformation. The study demonstrates that PWHT reduces residual stress and improves material quality by homogenizing the microstructure. Controlled cooling techniques effectively reduce distortion by allowing even temperature distribution during the cooling process. Mechanical tools provide nonthermal methods to stabilize and control deformation, significantly reducing distortion levels. Despite the success of these techniques, PT. INKA faces challenges related to process control and skill variance among workers. The study concludes that while reforming techniques significantly enhance the structural integrity and performance of railway components, consistent implementation and clear guidelines are essential for future improvements. Developing new technologies, enhancing workforce training, and creating comprehensive process guidelines are recommended to maintain high standards and competitiveness in the global market.
Analysis of Primary Coating Thickness Effects on Adhesion Strength in S355J2+N Steel Material Irwansyah, Andika Adevicky; Syukron, Muhammad; Setyani, Atik; Santoso, Muji
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.v5i1.12796

Abstract

Steel is a metal alloy primarily composed of iron, with carbon as its main alloying material along with several other components according to specific requirements. Low carbon steel has a carbon content of 0.05-0.3% and is easily manufacturable. This type of steel is commonly used for vehicle frames and other applications. The material used in this study is Carbon Steel S355J2, classified as low carbon steel with 0.15% carbon and 1.46% manganese. Carbon Steel S355J2 is used for the underframe of freight trains by PT Industri Kereta Api Indonesia. Coating and protection are crucial due to its susceptibility to corrosion, which can damage its structure in operational railway environments. As additional data for the company and learning for the researcher, a pull-off test was conducted varying the thickness of the primer coat. The results showed that sample A (110 µm), B (150 µm), and C (200 µm) achieved adhesion strengths of 2.5 MPa, 4.5 MPa, and 5 MPa respectively. The surface roughness level of the samples was 90 - 120 µm. Based on the test results, the most suitable coating system for the UGL underframe painting project for PT Industri Kereta Api (INKA) is a primer with a thickness of 150 µm (Sample B). This thickness is not too high, yet it significantly exceeds PT INKA's minimum criteria and avoids overcoating.
Analysis of Tin Grade and Recovery in Monazite Retreatment with Three Disc Magnetic Separator Adi Putri, Lintang Larasati; Probowati, Dyah; Amalia, Yasmina
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.v5i1.12900

Abstract

Retreatment is conducted to obtain tin that remains in the monazite tailings (2-3% Sn)  from the processing that has been carried out by PT. Timah. The purpose of this study is to analyse the presence of tin in monazite as well as the effect of magnetic intensity and opening feed on recovery and tin grade by employing a quantitative method of experimentation with three disc magnetic separator. In this study, magnetic intensity was used with disc 1, 2, and 3 respectively is 1.1 T, 1.3 T, 1.5 T (A); 1.3 T, 1.5 T, 1.7 T (B); and 1.5 T, 1.7 T, 1.9 T (C) with opening feed 0.4 cm and 0.8 cm. Based on the experiment, the highest tin grade is 7.33% with the largest combination of magnetic intensity, variation C, and opening feed 0.4 cm. Meanwhile, the highest recovery of 73.64% was obtained at the lowest magnetic intensity, variation A, with the same opening feed. It can be seen that by increasing the magnetic intensity, the tin content will be higher. Meanwhile based on some related experiment, the larger the opening feed, the higher the recovery. However, it should be noted that the opening feed used must not exceed 0.8 cm. If the opening feed used is equal or wider than 0.8 cm, it requires a strong magnetic intensity or the grade and recovery produced will not change significantly.
Renewable Energy Revolution: A Review Of Innovative Strategies Towards Net Zero Emission (NZE) Naibaho, Nathan Gorga Tona; Setyani, Atik; Pratomo, Dias Dibyo
Journal of Metallurgical Engineering and Processing Technology Vol 5, No 2 (February 2025)
Publisher : Universitas Pembangunan Nasional "Veteran" Yogyakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31315/jmept.v5i2.14023

Abstract

The Net Zero Emissions (NZE) program became a common term after the 2015 Paris Climate Agreement. This program aims to reduce environmental pollution that can cause global warming. Energy is one of the sectors that is the focus of the NZE program implementation efforts. The energy transition is a very important program, especially in relation to the NZE Program issue and mitigation of the Greenhouse Gas effect. The energy transition program must focus on reducing carbon intensity and providing more benefits to all households. Indonesia has committed to achieving NZE by 2060 or sooner. This study aims to examine the role of renewable energy in achieving the NZE program and analyze innovation strategies to accelerate the NZE program. This study uses a narrative literature review method to analyze information and literature. This study presents alternative solutions to the issue of renewable energy transition in realizing NZE. Utilization of abundant renewable energy to replace fossil fuels and also electrification of non-electricity sectors can be a priority solution in realizing NZE. In addition, the development of Carbon Capture, Utilization, Storage (CCUS), and Green Hydrogen technology is also very important for the industrial sector in mitigating the effects of greenhouse gases.
Study of Coal Ash Content Separation in Mallawa Area using The Dense Medium Separation Method Arifin, Mubdiana; Bakri, Suriyanto; Juradi, Muhammad Idris; Nurhawaisyah, Sitti Ratmi; Zulkarnaen, Dina
Journal of Metallurgical Engineering and Processing Technology Vol 5, No 2 (February 2025)
Publisher : Universitas Pembangunan Nasional "Veteran" Yogyakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31315/jmept.v5i2.14029

Abstract

Coal remains a major energy source globally, particularly for power generation and industries like iron, steel, chemicals, and cement. Indonesia's coal reserves are widespread, spanning regions such as Aceh, South Sumatra, East Kalimantan, and South Kalimantan. The Mallawa Formation in South Sulawesi also has coal, but it is of low quality due to high ash content, which lowers the calorific value and increases environmental pollution. Therefore, beneficiation is necessary to reduce ash content. The Dense Medium Separation method effectively separates coal from impurity minerals based on density. This study aims to evaluate ash reduction and separation yield across various coal fraction sizes. The coal washing process was conducted on fractions -60+80, -80+100, -100+150, and -150+200 mesh, using a perchloroethylene solution with a density of 1.6 g/ml as the separation medium. Initial coal sample analyses included proximate, calorific value, total sulfur, and mineral matter. Results showed Mallawa coal has 2.94% moisture, 40.60% volatile matter, 47.39% fixed carbon, 9.07% ash, 2.41% total sulfur, and 7053 kcal/kg calorific value, containing quartz, pyrite, calcite, and chlorite minerals. The DMS process on the -150+200 mesh fraction gave the best outcomes, with 50.39% ash elimination and 30.7% yield, making it the optimum size for ash separation in Mallawa coal.
The Study of Sintering Process in Metal Forming Setiawan, Agris; Pranoto, Aditya Wahyu; Adji Putrawan, Muhammad Rizki; Maharani, Monica
Journal of Metallurgical Engineering and Processing Technology Vol 5, No 2 (February 2025)
Publisher : Universitas Pembangunan Nasional "Veteran" Yogyakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31315/jmept.v5i2.14201

Abstract

Powder metallurgy is a technique used to produce metal components through the process of compacting and sintering metal powders. The sintering process involves heating the powder below its melting point, which allows the metal particles to bond together through a diffusion mechanism. This study examines the sintering mechanism, the factors that influence it, and the mechanical properties of the resulting materials. The research methods include a literature review and a literature study to collect information related to the sintering process of powder metal such as Al, Mg, Ti, Cu, Ni and Fe. The results show that sintering temperature and holding time of MMCs,AMCs have a significant effect on particle size that increase mechanical properties such as compressive strength, tensile strength, elastic modulus and density. Thus, a deeper understanding of the sintering process can improve the quality of metal products produced from powder metallurgy. 
Study of the Effect of Penetrant Temperature Variations on Corrosion Sensitivity of 7075 Alumnium material using the Liquid Penetrant Test Method at PT. Dirgantara Indonesia (IAe) Yudhistira, Prayogi; Prabowo, Imam; Yunardi, Yongki
Journal of Metallurgical Engineering and Processing Technology Vol 5, No 2 (February 2025)
Publisher : Universitas Pembangunan Nasional "Veteran" Yogyakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31315/jmept.v5i2.14293

Abstract

Non Destructive Test is a testing and analysis method carried out to evaluate and detect differences in characteristics or defects that arise in materials, components, structures or systems without causing damage to the part being tested. Liquid Penetrant Test is a Non-Destructive Test method using Liquid Penetrant containing Fluorescent by utilizing power capillarity which is the ability of the penetrant liquid to enter the gap discontinuity and developer work to lift the liquid back up which penetrates into cracks so that defects and corrosion can be detected. The purpose of this test is to determine discontinuities in the fabricated material by using 3 variations of penetrant temperature 5℃, 10℃ - 38℃, and 75℃ using 2 pieces of 7075 Aluminum material. Experiments carried out at normal temperatures (10℃-38℃) show clear indications of the material. while experiments using temperatures of 5℃ and 75℃ will make the indication on the material unclear (false indication) due to various factors such as viscosity, dwell time, penetration, developing. 

Page 13 of 13 | Total Record : 129

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