Garuda - Garba Rujukan Digital

PENERAPAN METODE KRITERIA RUNTUH HOEK & BROWN DALAM MENENTUKAN FAKTOR KEAMANAN PADA ANALISIS KESTABILAN LERENG DI LOOP 2 PT. KALTIM BATU MANUNGGAL KALIMANTAN TIMUR Amalia, Yasmina
PROMINE Vol 2, No 2 (2014): PROMINE
Publisher : Jurusan Teknik Pertambangan FT UBB

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (5.687 KB)

PT. Kaltim Batu Manunggal merupakan perusahaan tambang batubara diKabupaten Kutai Kartanegara, Provinsi Kalimantan Timur. Kegiatan Penambangandilakukan dengan membuat lereng berjenjang. Pembuatan lereng di perusahaantersebut tidak didasarkan pada kajian geoteknik, sehingga geometri lereng dibuatsama tanpa memperhatikan perbedaan karakterisasi massa batuandi lokasi penelitian.Perlakuan yang sama mempunyai tingkat keyakinan terhadap kestabilan lereng yangrendah.Penelitian dilakukan untuk mengklasifikasi massa batuan dengan sistem rockmass rating (RMR) dan geological strength index (GSI). RMR yang didapatkan padaloop 2 = 63. Nilai GSI merupakan nilai pengurangan 8 dari nilai RMR (Saptono,2012), sehingga didapat GSI = 55. Untuk mendapatkan nilai kohesi dan sudut gesekdalam digunakan pendekatan criteria runtuh Hoek and Brown (2002). Nilai kohesidan sudut gesek dalam pada loop 2 adalah 35 kN/m2 dan 26,99Âº.Dari hasil analisis dapat disimpulkan bahwa penentuan GSI untuk loop2adalah dengan tinggi 6 m dengan sudut kemiringan 35Âº. Untuk geometri lerengkeseluruhan dengan tinggi 42 m dan lebar jenjang 5 m.Keyword : Lereng, Hoek&Brown

Natrium Silikat Sebagai Inhibitor Korosi Pada Pipa Penyalur Minyak Bumi Jenis Carbon Steel Saputra, Andika; Hakim, Arief Rakhman; Hamdani, M Zulva; Alamsyah, Asfitrah; Amalia, Yasmina
Rekayasa Material, Manufaktur dan Energi Vol 5, No 2: September 2022
Publisher : Fakultas Teknik UMSU

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30596/rmme.v5i2.10559

Corrosion in the pipeline can cause leaks so crude oil directly pollutes the ocean ecosystem. Therefore, proper preventive methods are needed, such as using inhibitors. So far, the corrosion inhibitors used in the petroleum industry are of an inorganic type which can cause new problems such as toxicity to the environment and endanger human health. This paper describes an organic inhibitor based on sodium silicate obtained from rice husks through a synthetic method. The source of this inhibitor is very abundant in nature and the silica content is relatively high, around 86.90-93.70%. This inhibitor from rice husk, apart from having a good ability to reduce corrosion rates, also has the potential to be produced commercially.

Analisis Presentase Fraksi Massa Lolos Ayakan Galena Hasil Peremukan, Penggerusan, dan Pengayakan Amalia, Yasmina; Mirahati, Riria Zendy; Mardhatila, Fitri Ayu
Jurnal Mineral, Energi dan Lingkungan Vol 8, No 1 (2024): Jurnal Mineral Energi dan Lingkungan, Volume 8, No 1 Tahun 2024
Publisher : Fakultas Teknologi Mineral, Universitas Pembangunan Nasional (UPN)

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31315/jmel.v8i1.5573

Galena merupakan salah satu jenis batuan yang banyak digunakan sebagai bahan dasar baterai, pelapis kabel, pewarna dan lain-lain. Hasil penambangan galena terkadang masih besar, untuk memperkecil ukuran galena diperlukan proses peremukan dan penggerusan. Kominusi merupakan salah satu tahapan dalam pengolahan bahan galian yang bertujuan untuk memperkecil ukuran bahan galian. Penelitian ini bertujuan untuk menganalisis persentase fraksi massa yang lolos ayakan galena yang telah diremuk melalui jaw crusher dan digerus dengan ball mill, untuk analisis fraksi menggunakan proses pengayakan. Hasil analisa menunjukkan bahwa dari hasil pengujian peremukan, penggerusan, dan pengayakan untuk mesh diatas 200 didapatkan berat 800gram dari total sampel 3040 gram. Sehingga penelitian ini berhasil menghasilkan ukuran serbuk sebesar 20,3%.Kata Kunci: peremukan, penggerusan, pengayakan

Analisis Presentase Fraksi Massa Lolos Ayakan Galena Hasil Peremukan, Penggerusan, dan Pengayakan Amalia, Yasmina; Mirahati, Riria Zendy; Mardhatila, Fitri Ayu
Jurnal Mineral, Energi dan Lingkungan Vol 8, No 1 (2024): Jurnal Mineral Energi dan Lingkungan, Volume 8, No 1 Tahun 2024
Publisher : Fakultas Teknologi Mineral, Universitas Pembangunan Nasional (UPN)

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31315/jmel.v8i1.5573

Galena merupakan salah satu jenis batuan yang banyak digunakan sebagai bahan dasar baterai, pelapis kabel, pewarna dan lain-lain. Hasil penambangan galena terkadang masih besar, untuk memperkecil ukuran galena diperlukan proses peremukan dan penggerusan. Kominusi merupakan salah satu tahapan dalam pengolahan bahan galian yang bertujuan untuk memperkecil ukuran bahan galian. Penelitian ini bertujuan untuk menganalisis persentase fraksi massa yang lolos ayakan galena yang telah diremuk melalui jaw crusher dan digerus dengan ball mill, untuk analisis fraksi menggunakan proses pengayakan. Hasil analisa menunjukkan bahwa dari hasil pengujian peremukan, penggerusan, dan pengayakan untuk mesh diatas 200 didapatkan berat 800gram dari total sampel 3040 gram. Sehingga penelitian ini berhasil menghasilkan ukuran serbuk sebesar 20,3%.Kata Kunci: peremukan, penggerusan, pengayakan

Pemanfaatan Serbuk Terak Nickel Pig Iron untuk Aplikasi Material Struktural Amalia, Yasmina
Jurnal Teknologi Lingkungan Vol. 25 No. 2 (2024)
Publisher : BRIN Publishing (Penerbit BRIN)

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.55981/jtl.2024.5767

The amount of nickel slag waste is increasing over time as a result of the nickel mining and processing process. Slag must be processed properly so as not to damage the environment. So far, the slag has not been processed properly so it has only been piled up. In fact, slag can be reused for various sectors, one of which is construction. The aim of this research is to obtain a slag and zeolite-based cement formulation that meets ASTM for building and bridge construction. The method used in this research is quantitative experimental. This method approaches quantitative data and through laboratory experiments. This research mixed Nickel Pig Iron slag, cement and zeolite to obtain better compressive strength and sea water resistance values. The substitute cement is printed with a size of 10 cm x 5 cm. All ingredients are put into the mold until the mixture solidifies and forms. From the research that has been carried out, the substitute paste has the highest compressive strength, namely with 40% slag mixing compared to other experiments ranging from 15% to 60% mixing. Apart from that, the addition of 10% zeolite also increases the compressive strength of slag cement compared to without the addition of zeolite. Next, tests were carried out on the sea water environment. As a result, the substitutes for slag, cement, and zeolite have higher compressive strength and resistance to marine environments than the cement control. Abstrak Jumlah limbah terak nikel semakin lama semakin meningkat akibat dari proses penambangan dan pengolahan nikel. Terak harus diolah dengan baik agar tidak merusak lingkungan. Selama ini terak belum diolah dengan baik sehingga hanya dilakukan penimbunan saja. Padahal, terak dapat dimanfaatkan kembali untuk berbagai sektor, salah satunya konstruksi. Tujuan dari penelitian ini untuk mendapatkan formulasi semen berbasis terak dan zeolit yang memenuhi ASTM untuk konstruksi bangunan maupun jembatan. Metode yang digunakan pada penelitian ini adalah eksperimental kuantitatif. Metode ini melakukan pendekatan secara data kuantitatif dan melalui percobaan di laboratorium. Penelitian ini mencampurkan terak Nickel Pig Iron (NPI), semen, dan zeolit untuk mendapatkan nilai kuat tekan dan ketahanan air laut lebih baik. Semen substitusi dicetak dengan ukuran 10 cm x 5 cm. Seluruh bahan dimasukkan ke dalam cetakan sampai campuran memadat dan membentuk. Dari penelitian yang telah dilakukan, pasta substitusi yang memiliki kekuatan tekan tertinggi yaitu dengan pencampuran terak sebesar 40% dibandingkan dengan percobaan lainnya mulai dari pencampuran 15% hingga 60%. Selain itu penambahan zeolit 10% juga meningkatkan kuat tekan semen terak daripada tanpa penambahan zeolit. Selanjutnya dilakukan pengujian terhadap lingkungan air laut. Hasilnya substitusi dari terak, semen, dan zeolit memiliki kekuatan tekan dan ketahanan terhadap lingkungan laut yang lebih tinggi daripada kontrol semen.

Optimasi Fe-S Pada Residu Leaching Emas dengan Flotasi Powder Lime dan Lime Milk Suratinoyo, Zahna Allya Zulfa; Amalia, Yasmina; Probowati, Dyah
Rekayasa Material, Manufaktur dan Energi Vol 8, No 2: JULI 2025
Publisher : Fakultas Teknik UMSU

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30596/rmme.v8i2.25790

Gold processing using the leaching method can produce large amounts of residue that often contain iron (Fe) and sulphur (S). This residue has the potential to become hazardous waste if not managed properly, as the sulphide content can cause acid mine drainage and environmental contamination. The Fe-S content has potential as an additive in the construction industry, such as in asphalt and concrete mixtures. One method that can be used to separate and reuse the Fe-S components from leaching residues is flotation. This study was conducted quantitatively through laboratory experiments. The reagents used in this study were PAX (Potassium Amyl Xanthate) as a collector, MIBC (Methyl Isobutyl Carbinol) as a frother, and CuSO₄ and lime as modifiers. The lime used was powder lime (lime powder) and lime milk (dissolved lime). The objective of this study was to determine the influence of powder lime and lime milk variables in the flotation process of gold leaching residues, as well as to determine the optimal use of lime in terms of economic efficiency. The results obtained from this study indicate that flotation using powdered lime is more economical, with a lime cost of Rp165.60 per kg of feed, yielding an Fe content of 38.9% and an S content of 49.1%. Furthermore, the Fe recovery rate was 77.5% and the S recovery rate was 80.1%.

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

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.

Implementation of Metallurgical Industry Management Using the DMAIC Method in TS Aluminum Hafiz Faturrahman, Muhammad; Khayyan Bahiy, Oktavian; Carlotta, Nixon Carlotta; Amalia, Yasmina
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.v4i2.11432

The case study in this research comes from the TS Aluminum company in Yogyakarta. This research aims to reduce the number of defects in metal in the casting process from an industrial management point of view. This research method uses quantitative and qualitative methods through literature studies and experimental data with the DMAIC method.From the results of production and marketing carried out with a production volume of 250 pcs per day, there were 4% failures in the products produced. Defects that often occur are rat tail defects, cold shot, and porosity. Defects are caused by factors such as human error, methodology, and materials. Recommendations for improvement include providing regular training to employees, updating work procedures, and checking materials.

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

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.

Analisis Kegagalan Material Pada Sayap Pesawat Terbang (Review) Karimah, Armitha Lisanul; Mawarda, Mei Iftita; Pauru', Wilson; Ramadhan, Yanuar; Amalia, Yasmina
JUMANTARA: Jurnal Manajemen dan Teknologi Rekayasa Vol 1, No 1 (2022): Juli
Publisher : Institut Teknologi Dirgantara Adisutjipto

Penelitian ini bertujuan untuk mengetahui mekanisme analisis kegagalan material yang dilakukan pada sayap pesawat terbang. Analisis dilakukan dalam bentuk inspeksi visual, fraktografi makro, dan fraktografi SEM. Analisis tersebut menggunakan uji komposisi dengan spektroskopi X-ray fluorescence (XRF) dan Oxford Instruments X-MET 5100, analisis makroskopik dengan kamera digital Nikon SMZ 1500 dan mikroskop stereo, dan analisis fraktografi pembesaran yang lebih tinggi dilakukan dengan menggunakan FEI XL40 SFEG SEM. Berdasarkan analisis yang dilakukan, ditemukan bahwa kegagalan terjadi pada komponen sayap pesawat, retakan intergranular karena kelemahan struktur mikro, adalah penyebab kegagalan material. Analisis kegagalan material sangat penting untuk mengetahui dan mengungkapkan penyebab dan penanggulangan komponen yang gagal. Bentuk kegagalannya bisa berupa retakan, patah tulang, korosi, dan lain-lain.

Title

Found 12 Documents
Search

Abstract

Abstract

Abstract

Abstract

Abstract

Abstract

Abstract

Abstract

Abstract

Abstract

Title Search

Found 12 Documents Search

Abstract

Abstract

Abstract

Abstract

Abstract

Abstract

Abstract

Abstract

Abstract

Abstract

Title

Found 12 Documents
Search