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All Journal JMPM (Jurnal Material dan Proses Manufaktur) Dinamika Teknik Mesin : Jurnal Keilmuan dan Terapan Teknik Mesin Indonesian Mining Journal Indonesian Mining Journal
Herlina, Ulin
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Aerospace Engineering Automotive Engineering Chemical Engineering, Chemistry & Bioengineering Chemistry Earth & Planetary Sciences Energy Engineering Environmental Science Materials Science & Nanotechnology Mechanical Engineering Physics

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Pengaruh Variasi Temperatur Sinter Terhadap Kualitas Produksi Magnesium AZ31 Dengan Tube Furnace Herlina, Ulin; Yusuf, Muhammad; Sukmana, Irza
JMPM (Jurnal Material dan Proses Manufaktur) Vol 5, No 2 (2021): December
Publisher : Universitas Muhammadiyah Yogyakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.18196/jmpm.v5i2.12461

Abstract

Dalam penelitian ini, pengaruh variasi temperatur sinter terhadap sifat fisik dan mekanik magnesium AZ31 diujikan. Bahan dasar dibentuk dari geram bubut Magnesium AZ31 dan dikompaksi sebelum akhirnya dilakukan proses sintering dengan alat tube furnace. Proses sintering dilakukan pada berbagai temperatur yang dipilih, yaitu: 400oC, 450oC, 500oC, dan 550oC. Suhu sinter 400oC menghasilkan densitas tertinggi sebesar 1,82 gram/cm3 dan porositas terendah 0,54%, sedangkan suhu sinter 550oC menghasilkan densitas terendah sebesar 1,70 gram/cm3 dan porositas tertinggi 6,88%. Selanjutnya, angka kekerasan tertinggi adalah 41,49 kgf pada suhu sinter 400oC dan terendah 21,74 pada suhu sinter 550oC. Angka densitas dan kekerasan suhu 400oC tersebut disebabkan oleh ukuran butir paduan magnesium yang relatif besar dan memanjang dengan kerapatan yang baik dibandingkan yang lain, sesuai pengamatan gambar struktur mikro sample. Berdasarkan hasil uji scanning electron microscopy (SEM) dan energy dispersive        X-Ray analysis (EDX), ditemukan adanya retakan produk hasil sinter pada suhu 550oC. Hasil penelitian ini menunjukkan semakin tinggi suhu sinter, semakin kecil dan banyak pori yang terbentuk sehingga menyebabkan nilai densitas dan kekerasan yang menurun. Berdasarkan hasil yang didapat, selanjutnya dapat dilakukan pengujian menggunakan alat cor tekan (squeeze casting) untuk meningkatkan kualitas sifat mekanik dan fisik produk pengecoran magnesium AZ31.
Analisis tekno ekonomi teknologi pengolahan bijih nikel laterit menjadi Nickel Pig Iron (NPI) menggunakan Hot Blast Cupola Furnace Herlina, Ulin; Nurjaman, Fajar; Handoko, Anton Sapto; Shofi, Achmad
Dinamika Teknik Mesin: Jurnal Keilmuan dan Terapan Teknik Mesin Vol 10, No 1 (2020): Dinamika Teknik Mesin: Jurnal Keilmuan dan Terapan Teknik Mesin
Publisher : Universitas Mataram

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (244.851 KB) | DOI: 10.29303/dtm.v10i1.322

Abstract

Processing technology on nickel laterite ore to becomeNickel Pig Iron (NPI) using Hot blast cupola furnace issuch technology developed to push up the growth ofprocessing industry iron/steel contains nickel inIndonesia. The need of this technology is more urgentlyalong with the enforcement of regulation no 4/2009 inmineral and coal mining law, which prohibits all industryto export raw mineral products without preliminaryprocess. For this reason, in this research, technoeconomicanalysis for designing nickel lateriteprocessing plant to become NPI using hot blast cupolafurnace was carried out. This research was conductedbased on several data processes taken from nickellaterite smelting using hot blast cupola furnace. Technoeconomic analysis showed processing nickel laterite oreto become NPI using 3 units of hot blast cupola furnacewith total capacity 9 ton/day at kabupaten SouthKonawe, Southeast Sulawesi province was feasible tobe carried out, whereas feasibility investment score wasfair enough. The net present value (NPV) was IDR11,278,271,245, and internal rate of return (IRR) was23.28% with a payback period (PBP) of 4 years and 10months.
Analisis tekno ekonomi teknologi pengolahan bijih nikel laterit menjadi Nickel Pig Iron (NPI) menggunakan Hot Blast Cupola Furnace Herlina, Ulin; Nurjaman, Fajar; Handoko, Anton Sapto; Shofi, Achmad
Dinamika Teknik Mesin Vol 10, No 1 (2020): Dinamika Teknik Mesin: Jurnal Keilmuan dan Terapan Teknik Mesin
Publisher : Universitas Mataram

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.29303/dtm.v10i1.322

Abstract

Processing technology on nickel laterite ore to becomeNickel Pig Iron (NPI) using Hot blast cupola furnace issuch technology developed to push up the growth ofprocessing industry iron/steel contains nickel inIndonesia. The need of this technology is more urgentlyalong with the enforcement of regulation no 4/2009 inmineral and coal mining law, which prohibits all industryto export raw mineral products without preliminaryprocess. For this reason, in this research, technoeconomicanalysis for designing nickel lateriteprocessing plant to become NPI using hot blast cupolafurnace was carried out. This research was conductedbased on several data processes taken from nickellaterite smelting using hot blast cupola furnace. Technoeconomic analysis showed processing nickel laterite oreto become NPI using 3 units of hot blast cupola furnacewith total capacity 9 ton/day at kabupaten SouthKonawe, Southeast Sulawesi province was feasible tobe carried out, whereas feasibility investment score wasfair enough. The net present value (NPV) was IDR11,278,271,245, and internal rate of return (IRR) was23.28% with a payback period (PBP) of 4 years and 10months.
BENEFISIASI FISIK PADA PASIR KROMIT KADAR RENDAH MENGGUNAKAN MEJA GOYANG DAN DAVIS TUBE Herlina, Ulin; Nurjaman, Fajar; Suharno, Bambang; Mesah, Febriyani; Zulqoernain, Muhammad Syahreyzi Pashey; Al Fahmi, Muhammad Ridwan; Yuhelda; Suseno, Triswan; Bahfie, Fathan; Handoko, Anton Sapto; Zul Hakim, Hafid; Arham, La Ode
Indonesian Mining Journal Vol 28 No 2 (2025): Indonesian Mining Journal, October 2025
Publisher : Balai Besar Pengujian Mineral dan Batubara tekMIRA

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30556/imj.Vol28.No2.2025.1672

Abstract

The rapid growth of the global steel industry has significantly intensified the demand for the metallurgical-grade chromite ore required for ferrochrome production. This surge has led to a depletion of high-grade chromite reserves, necessitating the utilization of low- and medium-grade chromite to support a stable raw material supply for ferrochrome. This research was conducted to determine the characteristics of the ore and to analyze the effects of physical beneficiation processes using shaking table and Davis tube in enhancing the chromium (Cr) grade and the Cr:Fe ratio of low-grade chromite sand from Morowali, Central Sulawesi. The characterization process was conducted using XRF, XRD, and SEM-EDS. Experimental parameters for the shaking table included variations in table inclination and water flow rate, while magnetic separation was analyzed across various electric current intensities. The optimal shaking table test results were achieved at an inclination of 7.5° with a water flow rate of 18 liters/minute. In contrast, the optimal test using the Davis tube was obtained at an electric current of 0.4 amperes (660 gauss). This integrated process successfully increased Cr grade from 8.5% to 20.77% (corresponding to Cr2O3 30.36%) and improved the Cr:Fe ratio from 0.97 to 1.62, achieving a recovery rate of 94.93%.
BENEFISIASI FISIK PADA PASIR KROMIT KADAR RENDAH MENGGUNAKAN MEJA GOYANG DAN DAVIS TUBE Herlina, Ulin; Nurjaman, Fajar; Suharno, Bambang; Mesah, Febriyani; Zulqoernain, Muhammad Syahreyzi Pashey; Al Fahmi, Muhammad Ridwan; Yuhelda; Suseno, Triswan; Bahfie, Fathan; Handoko, Anton Sapto; Zul Hakim, Hafid; Arham, La Ode
Indonesian Mining Journal Vol 28 No 2 (2025): Indonesian Mining Journal, October 2025
Publisher : Balai Besar Pengujian Mineral dan Batubara tekMIRA

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30556/imj.Vol28.No2.2025.1672

Abstract

The rapid growth of the global steel industry has significantly intensified the demand for the metallurgical-grade chromite ore required for ferrochrome production. This surge has led to a depletion of high-grade chromite reserves, necessitating the utilization of low- and medium-grade chromite to support a stable raw material supply for ferrochrome. This research was conducted to determine the characteristics of the ore and to analyze the effects of physical beneficiation processes using shaking table and Davis tube in enhancing the chromium (Cr) grade and the Cr:Fe ratio of low-grade chromite sand from Morowali, Central Sulawesi. The characterization process was conducted using XRF, XRD, and SEM-EDS. Experimental parameters for the shaking table included variations in table inclination and water flow rate, while magnetic separation was analyzed across various electric current intensities. The optimal shaking table test results were achieved at an inclination of 7.5° with a water flow rate of 18 liters/minute. In contrast, the optimal test using the Davis tube was obtained at an electric current of 0.4 amperes (660 gauss). This integrated process successfully increased Cr grade from 8.5% to 20.77% (corresponding to Cr2O3 30.36%) and improved the Cr:Fe ratio from 0.97 to 1.62, achieving a recovery rate of 94.93%.
Co-Authors Al Fahmi, Muhammad Ridwan Anton Sapto Handoko, Anton Sapto Arham, La Ode Bahfie, Fathan Bambang Suharno Fajar Nurjaman Irza Sukmana, Irza Mesah, Febriyani Muhammad Yusuf Shofi, Achmad Triswan Suseno, Triswan Yuhelda Zul Hakim, Hafid Zulqoernain, Muhammad Syahreyzi Pashey