Effect double-primer placement for improving the fragmentation on harder material in stemming column: a case study

[摘要] The fragmentation is one of the indicator of the successful blasting operation, because the next step is loading the blasted material which is the equipment productivity is depend on the bucket fill factor. Greater size of material loaded means lower bucket fill factor. Lower bucket fill factor, lower equipment productivity. More crack due to blasting, easier loading equipment to dig it up. The explosive energy transferred to the surrounding caused radial crack first. Then the shock wave formed and travel through the crack. Higher Velocity of Detonation (VoD), higher detonation wave produced. Then, increasing distance from the source of VoD the energy is getting lower. The simply way to improve fragmentation is increasing the Powder Factor (PF), but it has any side effects. The double-primer placement with double deck method will improve the fragmentation while using the same value of PF.

[发布机构] Mining Engineering Department, Faculty of Mineral Technology, UPN Veteran Yogyakarta, Indonesia^1;PT DNX Indonesia, Jakarta, Indonesia^2

[效力级别] 矿业工程

[关键词] Blasting operations;Detonation waves;Double decks;Explosive energy;Loading equipment;Material loaded;Radial cracks;Velocity of detonation