LAFARGE EXSHAW FINER FRAGMENTATION STUDY

摘要

This paper presents data gathered during a comprehensive study on the impact of improvements to fragmentation in a major Limestone quarrying operation. The full impacts of gains in fragmentation are tracked through the mucking, crushing, and grinding phases of the operation.The target of this study was to attain a D-90 or 90% passing size of 0.20 meters from the current D-90 fragmentation level for production blasts of 0.60 meters, or in other words, basically increase fragmentation three fold. This was accomplished through a change from 200mm blast holes on a 6.0 × 7.0 meter pattern to 102mm blast holes on a 3.0 × 3.5 meter equilateral triangle based staggered pattern. Extensive use was made of high speed photography, WipFrag Fragmentation Analysis, production studies, power consumption studies, and micro fissure analysis, to track the impact of gains in fragmentation.