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首页> 外文会议>Annual conference on explosives and blasting technique >Winning thin coal seams with Stratablast?- improving coal recovery and sustainability at Anglo Coal’s Drayton Mine
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Winning thin coal seams with Stratablast?- improving coal recovery and sustainability at Anglo Coal’s Drayton Mine

机译：用Stratablast赢得薄煤层？-改善盎格鲁煤矿公司Drayton煤矿的煤炭回收率和可持续性

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In dragline coal mining operations, throw blasting is used for the controlled placement of overburden tomaximise coal exposure rates or to minimise overburden removal costs. This may necessitate sacrificingthin coal seams, generally less than one metre in thickness, which are often present in proximity to themain coal seam. This represents not only a significant loss of potential revenue and profit but also awaste of a valuable energy resource.The case study presented here demonstrates how StratablastTM (hereinafter referred to as “new method”)was used to recover a thin coal seam that was previously wasted in throw blasting, while simultaneouslyblasting multiple interburden layers underneath in “stand-up” mode to protect intervening coal seams.All this was achieved in a single drill and blast cycle to improve overall mine efficiencies. The blast wastechnically challenging, as the volume of overburden in the top throw blast layer was insufficient toprovide a substantial constraining layer over the upper coal seam, especially at the highwall. This meantthat the subsequent stand-up blast layers below had to result in virtually zero movement, in order toavoid loss of the coal edge. Sufficient fragmentation of the interburden layers still had to be achieved toensure the muckpile could be excavated efficiently. Blast models were used to assist in blast design.The paper presents design considerations and results of the successful implementation of three blasts atDrayton Mine. A reduction in coal damage and loss was achieved, with a higher overall coal recoverytogether with improvements in the recovered coal quality. Fragmentation, equipment performance andimplementation issues were also improved between blasts by reviewing and improving on themethodology of each of the blasts using this new method. A further benefit was reduced exposure toenvironmental risk for Drayton from vibration, noise and dust due to the reduction in the number of blastevents. Furthermore, the overall mine sustainability outcomes are improved by increased coal recoveriesfrom essentially the same mining activity and total footprint. Energy and greenhouse gas emissionintensities per tonne of coal produced are thus reduced.
机译：在拉铲式煤矿开采作业中，抛丸用于控制覆盖层到地面的位置。 最大程度地提高煤炭暴露率或最大程度地减少覆岩清除成本。这可能需要牺牲 薄煤层，通常厚度小于一米，通常存在于煤层附近 主煤层。这不仅意味着潜在收入和利润的重大损失，而且还意味着 浪费宝贵的能源。 此处提供的案例研究演示了StratablastTM（以下称为“新方法”）如何 用来恢复以前在抛丸处理中浪费的薄煤层，同时 以“竖立”模式对下方的多个地层进行爆破，以保护中间的煤层。 所有这些都是在一个钻孔和爆破循环中实现的，从而提高了整体矿山的效率。爆炸是 技术上具有挑战性，因为顶部抛丸层的覆土量不足以 在上煤层（特别是在高煤层）上方提供一个实质性的约束层。这意味着 为了使 避免损失煤边。仍必须实现内突层的充分碎裂 确保可以有效地挖掘渣土。爆炸模型用于协助爆炸设计。 本文介绍了设计注意事项和成功实施3次爆炸的结果 德雷顿矿。减少了煤炭破坏和损失，提高了总体煤炭回收率 并提高了回收煤的质量。碎片，设备性能和 通过审查和改进爆炸之间的实施问题也得到了改善。 使用这种新方法的每个爆炸的方法论。另一个好处是减少了接触 由于爆炸次数减少，振动，噪音和灰尘对Drayton造成了环境风险 事件。此外，煤炭采收率的提高改善了矿山的总体可持续性成果 来自基本相同的采矿活动和总足迹。能源和温室气体排放 这样就降低了每吨煤的强度。

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