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All Journal Abdi: Jurnal Pengabdian dan Pemberdayaan Masyarakat Blend Sains Jurnal Teknik TEKSTUR : Jurnal Teknologi Infrastruktur Venus: Jurnal Publikasi Rumpun Ilmu Teknik Jurnal Keilmuan dan Aplikasi Teknologi Industri Jurnal Keilmuan dan Aplikasi Teknologi Industri
Hisni Rahmi
Teknik Pertambangan, Fakultas Sains Dan Teknologi, Universitas Jambi
Automotive Engineering Chemical Engineering, Chemistry & Bioengineering Civil Engineering, Building, Construction & Architecture Computer Science & IT Control & Systems Engineering Education Electrical & Electronics Engineering Engineering Environmental Science Health Professions Industrial & Manufacturing Engineering Mechanical Engineering Medicine & Pharmacology Public Health Transportation

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Penurunan Kadar Fe Dan Mn Menggunakan Kapur Tohor (CaO) Pada Penetralan Air Asam Tambang Yolno Vernando; Afni Nelvi; Ahmad Fadhly; Dian Hadiyansyah; Hisni Rahmi
Jurnal Teknologi Infrastruktur Vol 7 No 02 (2025): Jurnal Teknologi Infrastruktur Vol 7 No 02 tahun 2025
Publisher : Fakultas Teknik Universitas Panca Bhakti

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Abstract

The treatment of acid mine drainage at PT Bumi Bara Makmur Mandiri is conducted using an active treatment method. It was found that there is cloudy wastewater with a brownish and reddish-brown color in the settling pond. The objective of this study was to analyze the changes in pH, Fe and Mn concentrations in acid mine drainage samples using quicklime and to calculate the cost required for neutralizing the acid mine drainage. The neutralization process was carried out on a laboratory scale using an experimental method with 3 variations of quicklime doses: 0.2 g/l, 0.3 g/l, and 0.4 g/l. The results showed that quicklime is effective in reducing Fe and Mn value in acid mine drainage. The initial pH of the acid mine drainage was 6.05. The pH increased with the increase in the quicklime coagulant dose. The Fe concentration before the neutralization of acid mine drainage was 1.20 mg/l, which decreased to 0.15 mg/L for all given dose variations. The initial Mn concentration exceeded the environmental quality standard and showed a significant reduction at a dosage of 0.2 g/L, decreasing from 72.20 mg/L to 0.08 mg/L. Similar Mn concentrations were obtained at dosages of 0.3 g/L and 0.4 g/L, each resulting in 0.122 mg/L. The cost required to neutralize Fe and Mn was IDR 368,000 per day, or IDR 11,040,000 per month.
Analisis Produktivitas Alat dan Faktor yang Menghambat Produksi pada Kegiatan Pengupasan Overburden di Tambang Batubara Maisa Illahi Darni; Hisni Rahmi; Lydia Kartika Basaria Sitompul; Qurratul Ayun; Afni Nelvi; Ericson Ericson
Venus: Jurnal Publikasi Rumpun Ilmu Teknik  Vol. 3 No. 6 (2025): Venus: Jurnal Publikasi Rumpun Ilmu Teknik
Publisher : Asosiasi Riset Ilmu Teknik Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.61132/venus.v3i6.1236

Abstract

Overburden removal at Pit B did not meet the production targets for June and July 2025, which were set at 570,698.8 BCM and 400,986.56 BCM, respectively, while the actual production achieved was 507,071.66 BCM and 312,128.23 BCM. This study aims to determine the theoretical productivity of loading and hauling equipment and to identify the factors that hinder the achievement of production targets. The primary data used in this study include the cycle time of loading equipment, the cycle time of hauling equipment, bucket fill factor, and delay time. The secondary data required consist of swell factor, number of passes, bucket capacity, and available working time. The productivity of the loading equipment was 332.58 BCM/hour, while the hauling equipment achieved a productivity of 53.16 BCM/hour, with a match factor of 0.74. This indicates that the loading equipment experienced waiting time during loading operations due to the hauling equipment not operating optimally or at full capacity. The factors inhibiting the achievement of production targets include a narrow, waterlogged, and uneven working face; hard overburden material; a road grade of 16%, which exceeds the standard maximum of 12%; a curve road width of 15 m, which is less than the ideal minimum width of 19.95 m; undulating haul roads; narrow haul road width; and dusty road conditions.
Co-Authors Achmad Muharram Syahrani Afni Nelvi Ahmad Fadhly Andrawina, Andrawina Anggia Arista Annisa Intan Yustisia Rahmalina Christian Pranata Saragi Deden Saputra Dego Retiandi Putra Deri Kurniadi Desmawita Devit Rahmawati Dian Hadiyansyah Doli Jumat Rianto Ericson Ericson Jevie C. Eka Putra Khalik Dwika Putra Maisa Illahi Darni Marisa Oktavia Marliantoni Muhammad Faisal Seprizal Mutiara Salvira Qurratul Ayun Qurratul A’yun Restu Juniah Restu Juniah Restu Juniah Sitompul, Lydia Kartika Basaria Syaifudin Zakir Syarifudin Yolno Vernando Yosa Megasukma Zella Navtalia