Evaluasi Geometri Peledakan Untuk Mendapatkan Fragmentasi yang Sesuai Umpan Jaw Crusher di PT. Wira Penta Kencana, Karimun
Abstract
Fazrin MM, Mukiat M, Bochori B. 2020. Blasting geometry evaluation in order to produce desired granite fragmentation using jaw crusher in PT. Wira Penta Kencana Karimun. In: Herlinda S et al. (Eds), Prosiding Seminar Nasional Lahan Suboptimal ke-8 Tahun 2020, Palembang 20 Oktober 2020. pp. xx. Palembang: Penerbit & Percetakan Universitas Sriwijaya (UNSRI).
PT.Wira Penta Kencana uses blasting methode to crack rock material and to produce desiret blasting fragmentation that is suitable with jaw crusher Nordberg C-140 in order to maximize the production. Blasting geometry is one of the parameter to produce good quality of blasting fragmentation. The percentage of boulder-sized blasting fragmentation (> 80 cm) that is produced currently in the field is 31,62% with powder factor 0,28. The boulder-sized of blasting fragmentation >80 cm with percentage >30% needs reevaluated blasting geometry in order to decrease boulder-sized of blasting fragmentation. This study aims to reevaluate blasting geometry which is used by PT. Wira Kencana in order to produce boulder-sized of blasting fragmentation that is suitable with feed jaw crusher Nordberg C-140 and reach the amount of blasting target (10.000 tons/ blasting). This study is a quantitative study. The equation that is used to reevaluate blasting geometry is C. J. Conya equation. The reevaluated blasting geometry by using C. J. Conya equation produces bore hole 4,5 inch, burden 3,40 m, spacing 4,70 m, stemming 2,38 m, subdrilling 1,2 m, hole depth 15,02 m, bench height 14,00 m, main charge 12,45 m. It needs 80 blasting hole to reach the amount of blasting target. In conclusion, the reevaluated blasting geometry produces boulder-sized blasting fragmentation >80 cm with percentage 28,70% (powder factor 0,27). The blasting fragmentation will become more accurate if blasting point in field is measured correctly that is suitable with the blasting geometry.
PT.Wira Penta Kencana uses blasting methode to crack rock material and to produce desiret blasting fragmentation that is suitable with jaw crusher Nordberg C-140 in order to maximize the production. Blasting geometry is one of the parameter to produce good quality of blasting fragmentation. The percentage of boulder-sized blasting fragmentation (> 80 cm) that is produced currently in the field is 31,62% with powder factor 0,28. The boulder-sized of blasting fragmentation >80 cm with percentage >30% needs reevaluated blasting geometry in order to decrease boulder-sized of blasting fragmentation. This study aims to reevaluate blasting geometry which is used by PT. Wira Kencana in order to produce boulder-sized of blasting fragmentation that is suitable with feed jaw crusher Nordberg C-140 and reach the amount of blasting target (10.000 tons/ blasting). This study is a quantitative study. The equation that is used to reevaluate blasting geometry is C. J. Conya equation. The reevaluated blasting geometry by using C. J. Conya equation produces bore hole 4,5 inch, burden 3,40 m, spacing 4,70 m, stemming 2,38 m, subdrilling 1,2 m, hole depth 15,02 m, bench height 14,00 m, main charge 12,45 m. It needs 80 blasting hole to reach the amount of blasting target. In conclusion, the reevaluated blasting geometry produces boulder-sized blasting fragmentation >80 cm with percentage 28,70% (powder factor 0,27). The blasting fragmentation will become more accurate if blasting point in field is measured correctly that is suitable with the blasting geometry.
Keywords
quarry method, granite, blasting, digging rate
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