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Prosiding Seminar Nasional Rekayasa Teknologi Industri dan Informasi ReTII
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Arjuna Subject : Teknik (semua kategori) - Teknik (Lain-Lain)
Articles 905 Documents
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Analisis Penggunaan Campuran Material Batupasir dengan Batulempung untuk Material Perkerasan Jalan Tambang di PT Belengkong Mineral Resources Site Insani Baraperkasa Kabupaten Kutai Kartanegara, Kalimantan Timur Muhammad Rayhan Fhadillah; Agus Winarno; Oktaviani, Revia; Tommy Trides; Windhu Nugroho
Retii Vol 18 No 1 (2023): Prosiding Seminar Nasional ReTII ke-18 (Edisi Penelitian)
Publisher : Institut Teknologi Nasional Yogyakarta

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Abstract

In this planning, it is assumed that the CBR value of the subgrade used is the result of taking the CBR value of the field. From the results of the field CBR values obtained 7.158%. Based on Hasi plotting obtained a thick figure of 18.6 inches. That is, that the total thickness must be at least 18.6 inches above the subgrade. Road layer structure planning recommendation for 7.7 in thick subbase course using Clay R50 % sample with CBR value 29.31%, 7.3 in thick base course using Clay R40 % sample with CBR value 32.11%, and 3.1 in thick surface course using Clay R30 % sample with CBR value 36.87%.
Efektivitas Kapur Tohor Terhadap Peningkatan Ph Dan Penurunan Kadar Logam Fe Dan Mn Di Settling Pond 11 PT. Alam Jaya Pratama Site Bara Kumala Sakti Kecamatan Loa Kulu, Kabupaten Kutai Kartanegara, Provinsi Kalimantan Timur Jovanda Ego Prisitama; Henny Magdalena; Shalaho Dina Devy
Retii Vol 18 No 1 (2023): Prosiding Seminar Nasional ReTII ke-18 (Edisi Penelitian)
Publisher : Institut Teknologi Nasional Yogyakarta

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Abstract

The settling pond is the final location where water comes from the Pit, Sump, Disposal and run-off water around the mining location at PT. Alam Jaya Pratama site Bara Kumala Sakti. Water quality in settling pond that does not meet the Mining Activity Waste Water Quality Standards can be managed using chemicals, one of which is Calcium Oxide (CaO). The need for Calcium Oxide can be determined after knowing the most effective dose in the settling pond. Calcium Oxide functions to neutralize pH and reduce metal levels (Fe and Mn) in settling ponds. Based on facts in the field, the poor water quality for the surrounding environment is due to the management period being too long and the efficiency of using Calcium Oxide incorrectly. So that the quality of the water released can meet the standards, regular monitoring and testing of the water quality in the settling pond is required with the final aim of the water output being in accordance with the standards and the amount of Calcium Oxide needed in Settling Pond 11 can also be known. From the results of initial measurements on water samples at Inlet Settling Pond 11 was obtained an average pH of 3,25; levels of Fe 1,61 mg/L; levels of Mn 2,81 mg/L are below standard. By testing using the titration method, the average optimum dose for increasing pH and reducing metal levels was 1 mg/L. After each sample went through a titration test, the average was obtained, namely: pH 7,32; levels of Fe 0,46 mg/L; and levels of Mn 1,63 mg/L. From this average dose, the need for Calcium Oxide is 223,32 kg/month. The comparison of Calcium Oxide usage per month between actual and calculated is 500 kg : 223,32 kg. The recommendation from this comparison is that these results can be taken into consideration to optimize the use of Calcium Oxide in Settling Pond 11.
Evaluasi Unjuk Kerja Peralatan Pada Kegiatan Penambangan Pit-3 Timur, PT. Bukit Asam Tbk Dwi T. S. Fambudi; Harjuni Hasan; Henny Magdalena; Revia Oktaviani; Agus Winarno
Retii Vol 18 No 1 (2023): Prosiding Seminar Nasional ReTII ke-18 (Edisi Penelitian)
Publisher : Institut Teknologi Nasional Yogyakarta

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Abstract

Bukit Asam Tbk is a company operating in the coal mining sector located in Lawang Kidul District, Muara Enim Regency, South Sumatra Province. Observations were carried out on mining activities at Pit-3 Timur and coal handling operational unit-5 to find out what obstacles existed during production activities such as machine breakdowns, queues for transportation equipment, and so on. Therefore, it is necessary to carry out routine maintenance and monitoring of equipment, so that existing obstacles can be minimized. The actual total production value on the mining front is 207,719.15 tons, with the effectiveness of the digging-loading tool being 63.52% and the effectiveness of the tool being 64.89%.
Penentuan Tinggi Stemming Dan Jarak Burden Berdasarkan Jarak Flyrock Di Pit Inul Middle Panel 3 PT. Kaltim Prima Coal Kalimantan Timur Yekeskiel Nimsi; Windhu Nugroho; Oktaviani, Revia
Retii Vol 18 No 1 (2023): Prosiding Seminar Nasional ReTII ke-18 (Edisi Penelitian)
Publisher : Institut Teknologi Nasional Yogyakarta

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Abstract

Stripping overburden using the blasting method is more economical than using equipment. One of the impacts caused by blasting activities is flyrock. Flyrock influences how far people and units have to be evacuated during blasting activities, so by controlling flyrock the evacuation distance can be reduced based on existing studies, in accordance with Ministerial Decree No. 1827.K/30/MEM/2018. By using the Richard and Moore equation, the distance of the flyrock throw can be predicted by approaching constant values ​​adjusted to the actual conditions at Pit Inul Middle. The research results show that there are several factors that influence the occurrence of flyrock, namely burden with a coefficient of determination value of 0.5183 and stemming height with a coefficient of determination value of 0.4142. Both of these factors have a moderate (medium or sufficient) correlation with flyrock. The actual average distance of flyrock that occurred during data collection was 11.58 meters and the furthest was 39.74 meters. By knowing the prediction of the maximum flyrock throw and considering the safety factor of the equipment, standard values ​​for the stemming and burden height variables can be set, namely a minimum of 2 meters.
Penggunaan Kalsium Hidroksida (Ca(OH)2) Dan Aluminium Sulfat ((Al2SO4)3) Untuk Pengolahan Air Limbah Settling Pond PT. Internasional Prima Coal Fransiska Angelina Kusnanto; Shalaho Dina Devy; Agus Winarno
Retii Vol 18 No 1 (2023): Prosiding Seminar Nasional ReTII ke-18 (Edisi Penelitian)
Publisher : Institut Teknologi Nasional Yogyakarta

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Abstract

Acid mine drainage (AAT) is water formed at mining sites with a low pH (pH<6) as a result of opening up a potential for rock acidity, causing problems for water quality, and rocks containing sulfide minerals. The purpose of this study was to determine the effect of using calcium hydroxide (Ca(OH)2) and aluminium sulphate ((Al2SO4)3) at optimum doses on neutralizing pH and reducing metal content in AAT. This study used a variation of the dose of calcium hydroxide (Ca(OH)2) of 0,5; 0,75; 1; and 1,25 grams and the variation of the dose of aluminium sulphate ((Al2SO4)3) of 1; 1,75; 2,5; and 3,25 grams with a contact time of 30 minutes. The initial concentration of TSS acid mine drainage was 430 mg/L, Fe was 26,92 mg/L, Mn was 7,69 mg/L, and pH was 3,8. The results showed that the doses of calcium hydroxide (Ca(OH)2) and aluminium sulphate ((Al2SO4)3) had an effect on Ph, TSS, Fe, and Mn. TSS removal efficiency was 96,89%, Fe was 99,74%, and Mn was 95,19%.
Perhitungan Kehilangan Batubara Pada Kegiatan Penimbangan Sampai Tongkang di PT Multi Harapan Utama Kabupaten Kutai Kartanegara Provinsi Kalimantan Timur Ilma Nurjanah; Agus Winarno; Henny Magdalena; Windhu Nugroho
Retii Vol 18 No 1 (2023): Prosiding Seminar Nasional ReTII ke-18 (Edisi Penelitian)
Publisher : Institut Teknologi Nasional Yogyakarta

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Abstract

The research was conducted at the stockROM owned by PT Multi Harapan Utama (PT MHU) which is managed by PT Mitra Terminal Kaltim. In the process of receiving to shipping coal, factors that cannot be avoided. The amount of coal loss from weighing to barge in May was 1,955 tons with factors that caused the loss, namely in the process of weighing, transporting, stacking, and crushing coal and loading on barges, taking test samples and operator negligence. Referring to the reference coal price of the Ministry of Energy and Resources (ESDM) in May 2023 PT MHU has the potential to experience a loss of Rp. 5.251.062.510.
Faktor Penyebab Kehilangan Batubara Di Pit 15 PT Multi Harapan Utama Kabupaten Kutai Kartanegara Provinsi Kalimantan Timur Siti Asmasari; Agus Winarno; Tommy Trides; Windhu Nugroho; Shalaho Dina Devy
Retii Vol 18 No 1 (2023): Prosiding Seminar Nasional ReTII ke-18 (Edisi Penelitian)
Publisher : Institut Teknologi Nasional Yogyakarta

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Abstract

The research was conducted in pit 15 of PT Multi Harapan Utama. In the process of mining activities in pit 15 in May 2023 in seam 14, 14X, 14XL, 15U, 15U1, and 15U2. There are several activities that result in coal losses, the amount of coal loss is 685 tons so the mining recovery is 98.74%. Coal loss in pit 15 occurred due to incomplete coal mining, coal re-cleaning, scattered coal not directly transported to the stockpile, waterlogged loading points, coal weighing, and distance of coal survey data collection.
Perilaku Tanah Longsoran di Jalan Sultan Sulaiman Kecamatan Sambutan, Samarinda Kalimantan Timur Oktaviani, Revia; Benny Christian BB; Windhu Nugroho; Tommy Trides; Albertus J Pontus
Retii Vol 18 No 1 (2023): Prosiding Seminar Nasional ReTII ke-18 (Edisi Penelitian)
Publisher : Institut Teknologi Nasional Yogyakarta

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Abstract

Clayey silt is one of the soils that cause many problems in infrastructure. The nature of clay depends on the dominance of the minerals it contains, this can give different behavior between clayey silt in one place and clayey silt in another place. This study aims to determine the behavior of clayey silt material in landslides on Sultan Sulaiman Road, Sambutan sub-district of Samarinda and find relationships between its physical properties including plasticity index relationship with water content and swelling. USCS classification results are included in the silt (ML) group. From the test results of moisture content ranged from 26.3% - 36.3%, Atterberg boundary tested resulted in a soil plasticity index of 28.7%, 17.3%, 14.7%, 14.7%, 13.8%, 2.6% and has an average of 15.3%. The average development percentage obtained is 1.7%, so the expansive degree of development potential is still in the low category, while the resulted of the landslide development pressure test are 135 kPa, 130 kPa, 66 kPa, 64 kPa, 39 kPa, 35 kPa with an average result of 78.2 kPa, also included in the low development potential group.
Pengaruh Muatan Bahan Peledak Dan Delay Peledakan Terhadap Tingkat Getaran Tanah Akibat Aktivitas Peledakan Kasbillah; Agus Winarno; Lucia Litha Respati; Revia Oktaviani; Tommy Trides
Retii Vol 18 No 1 (2023): Prosiding Seminar Nasional ReTII ke-18 (Edisi Penelitian)
Publisher : Institut Teknologi Nasional Yogyakarta

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Abstract

Blasting activities carried out in mining activities always produce effects that will have an impact on the surrounding area of the blasting site, from some of the blasting effects that exist one of which is soil vibration, so that at the research site in Pit Jongkang which is close to the village with a distance of approximately 300-400m it is very important to measure the level of vibration leading to the village so that the results of the vibration caused by the blasting process are obtained. Based on the results of the analysis obtained the effect of the explosive charge on the vibration of the soil that is the more the explosive charge of the resulting vibration will be greater. And with the holes that explode simultaneously, the vibration caused will be large so that the use of delay time is needed to minimize the presence of holes that explode simultaneously so that the resulting vibration does not exceed the 2 mm/s vibration limit. For recommendations on the maximum amount of explosive charge so that the vibration caused does not exceed the PPV standard, namely at a distance of 300 m, and 400 m by 36 kg, and 64 kg, perdelay. With the use of the recommended surface delay is a pair of surface delay 42 ms and 67 ms in the echelon cut circuit pattern, because it slightly efficiencies the time and the resulting PPV does not exceed 2 mm/s.
Kajian Geoteknik Pembentukan Embankment Sisi Utara Side Wall Pit G-H PT Borneo Indobara Suhada, Akbar; Andy Erwin Wijaya; Adi Kurniadi; Bayu Angkasa Utoro
Retii Vol 18 No 1 (2023): Prosiding Seminar Nasional ReTII ke-18 (Edisi Penelitian)
Publisher : Institut Teknologi Nasional Yogyakarta

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Abstract

Pada pit G-H PT Borneo Indobara terdapat Sungai ditengah pit yang dapat sewaktu-waktu banjir, Jika terjadi banjir akan membanjiri pit yang masih aktif melakukan penggalian dan banyak aktifitas sehingga beresiko menimbulkan kerugian berupa kerusakan alat bahkan berpotensi menimbulkan korban jiwa. Untuk mengurangi resiko ini diperlukan embankment. Pembentukan embankment dilakukan dengan mendesign embakment dan melakukan analisis geoteknik untuk memastikan keamanan lereng tambang agar dipastikan saat terbentuk tidak terjadi longsor pada lereng tambang. Setelah dilakukan kajian geoteknik dengan melakukan cros section pada 3 segmen didapatkan data Pada section line 1 memiliki Pof : 0% dan FK > 1.246 pada segmen 1 aman, Pada section line 2 memiliki Pof : 0% dan FK > 1.428 menandakan pada segmen ini aman, dan Pada section line 3 memiliki Pof : 0% dan FK > 0.577, pada segmen 3 perlu dilakukan perbaikan dengan mengurangi lebar embankment, setelah dilakukan perbaikan pada segmen 3 didapati dengan mengurangi lebar embankment menjadi 15 didapati bahwa naik menjadi > 1.249 dengan Pof 0% dengan design yang telah direvisi aman untuk di bentuk. Katakunci : Banjir, Embankment, section, FK.

Page 76 of 91 | Total Record : 905

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