Skripsi

KAJIAN OPERASIONAL SELECTIVE BREAKER ROTARY (SBR) 02 DALAM MENGOPTIMALKAN KEBUTUHAN COAL PRODUCT DI STOCKPILE 4, PT BUKIT ASAM (PERSERO) TBK.

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PT Bukit Asam (Persero) Tbk., manages a Mining Business License (IUP) covering an area of 40,347 hectares through the Tanjung Enim Mining Unit (UPTE), which encompasses four operational blocks: Banko Barat, Banko Tengah, Muara Tiga Besar, and Tambang Air Laya. This study was conducted at Pit 2, Banko Barat, at the Livestock Dump Hopper 4 (LSDH 4) unit, using an open-pit mining system that involves production stages ranging from land clearing, topsoil and overburden stripping, ripping, coal excavation and loading, to transportation to a temporary stockpile. PT Bukit Asam’s coal production recorded a 16% growth in the first half of 2025, reaching 21.73 million tons compared to 18.76 million tons in the same period the previous year, with LSDH 4’s realized output in January 2026 amounting to 681,145 tons, exceeding the target of 672,000 tons. Sub-bituminous coal with a calorific value of 5,100 kcal produced from Pit 2 at Banko Barat must meet both mine brand and market brand specifications; therefore, all material is processed through the Coal Handling Operations (CHO) system, which includes crushing, screening, and distribution via belt conveyors to CHO Stockpile 4 and the Train Loading Station (TLS) before being shipped to Tarahan Port and Kertapati Wharf. To improve the efficiency of this CHO chain, PT Bukit Asam has integrated a Selective Breaker Rotary (SBR) 02 unit into LSDH 4, a rotary breaker that combines three functions into a single unit: size reduction, rotary screening, and selective separation of impurities, where undersize material passes through the rotating screen while hard impurities are discharged through the drum’s outlet (sliding chute). This study was motivated by the lack of a systematic analysis based on actual field data regarding the operational and economic performance of SBR 02 since it began operations. This study aims to identify the coal handling process flow from Pit 2 to Stockpile 4, analyze the operational performance of SBR 02 based on the comparison of theoretical and actual flow rates, reduction ratio, and the effectiveness of rock separation, as well as calculate operational costs based on electricity consumption per ton of processed coal. This study employs a quantitative method with a descriptive approach to generate accurate and measurable field data through continuous data collection, including analysis of feed and product fragmentation using Split Desktop 2.0 software, as well as calculations of theoretical and actual capacities, reduction ratios, equipment availability (MA, PA, UA, EU), and specific energy costs. The analysis results show that the theoretical capacity of SBR 02 is 819.25 ton/hour, with an actual capacity of 548,06 ton/hour, resulting in an efficiency of 69,90%. This underfeeding condition is caused by fluctuations in the actual fill factor, which ranges from 3.93% to 25.05%, deviating from the optimal range of 20–30%, resulting in intermittent loading that degrades efficiency in a nonlinear manner. This condition was exacerbated by an increased distance of the material from the feeding area, which lengthened the cycle time, reduced the cycle frequency, and caused fluctuating underfeeding during operation. The average reduction ratio was recorded at 2.00, consistent with the typical characteristics of a rotary breaker, while the separation efficiency of the stone pack increased 48.32-fold following the installation of the SBR, with a mechanical availability (MA) of 92% and a physical availability (PA) of 93%. The operational cost of SBR 02 based on electricity consumption was recorded at Rp106,562,341.13/month or Rp568.71/ton. It is concluded that the performance degradation of SBR 02 does not stem from internal issues with the SBR 02 unit itself, but rather from instability in the upstream material supply system. Therefore, it is recommended to install flow rate measurement instruments on SBR 02, optimize the cycle time of the feeder by reducing transport distance, and conduct a comprehensive follow-up study on fill factor parameters and material characteristics.

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Detail Information

Series Title

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Call Number

T2002972026

Publisher

Indralaya : Prodi Teknik Pertambangan, Jurusan Pertambangan dan Geologi Fakultas Teknik Universitas Sriwijaya., 2026

Collation

xviii, 180 hlm.; ilus.; tab.; 29 cm.

Language

Indonesia

ISBN/ISSN

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Classification

622.07

Content Type

Text

Media Type

-

Carrier Type

-

Edition

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Subject(s)

teknik pertambangan
Prodi Teknik Pertambangan

Specific Detail Info

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MI

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