ANALISIS NILAI POWDER FACTOR TERHADAP FRAGMENTASI HASIL PELEDAKAN PADA PT SEMEN PADANG (PERSERO)

DANERA, AYSAR WALAKRAM EL and Hadi, Alek Al and Oktarinasari, Eva (2025) ANALISIS NILAI POWDER FACTOR TERHADAP FRAGMENTASI HASIL PELEDAKAN PADA PT SEMEN PADANG (PERSERO). Undergraduate thesis, Sriwijaya University.

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Abstract

PT Semen Padang, a leading cement producer, relies on blasting to fragment limestone, a key raw material. Powder Factor (PF) is critical for achieving optimal rock fragmentation and production efficiency. Insufficient PF leads to coarse fragmentation, necessitating secondary breakage and hindering grinding, while excessive PF results in over-fragmentation. The company standard limits boulders (≥80 cm) to a maximum of 20%. This study, conducted from March 3 to April 14, 2025, at the Indarung limestone quarry in Padang, analyzed actual blasting geometry and fragmentation to determine the optimal PF. Primary data, including actual blasting geometry and fragmentation, were collected in the field. Secondary data, such as maps, Dabex 73 explosive specifications (density 1.2 g/cc), and Blastability Index, were sourced from literature and archives. Data processing utilized Ms. Word, Ms. Excel, and Split Desktop 4.0. The average actual blasting geometry at PT Semen Padang featured a burden of 3.5 m, spacing of 3.9 m, stemming of 4 m, subdrill of 1 m, powder column of 7 m, and a hole depth of 11 m, yielding an actual PF of 0.31 kg/ton. Fragmentation analysis via Split Desktop 4.0 indicated that 87.81% of the rock was ≤80 cm, with 12.19% boulders, meeting the company's established standards. However, theoretical comparisons revealed potential for optimization. The R.L. Ash recommendation suggested an optimal PF of 0.18 kg/ton with a Scale Depth (SD) of 1.28 (classified as controlled energy). Applying this, planned fragmentation (Kuz-Ram with R.L. Ash) projected a more optimal 7.87% boulder content. The ICI-Explosive recommendation also indicated a PF of 0.18 kg/ton but with an SD of 1.46 (very controlled energy), resulting in 9.94% boulders. In conclusion, while PT Semen Padang's current blasting geometry meets boulder standards, the R.L. Ash recommendation offers a more optimal PF (0.18 kg/ton) with a superior SD (1.28, or controlled energy), and a lower percentage of boulders than both the current actual geometry and the ICI-Explosive recommendation. Implementing the R.L. Ash method holds significant potential to enhance efficiency and optimize blasting fragmentation.

Item Type:	Thesis (Undergraduate)
Uncontrolled Keywords:	Blasting geometry, fragmentation, powder factor
Subjects:	T Technology > TN Mining engineering. Metallurgy > TN1-997 Mining engineering. Metallurgy
Divisions:	03-Faculty of Engineering > 31201-Mining Engineering (S1)
Depositing User:	Aysar Walakram El Danera
Date Deposited:	06 Aug 2025 04:40
Last Modified:	06 Aug 2025 04:40
URI:	http://repository.unsri.ac.id/id/eprint/182329

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