Underground coal mines apply finely powdered limestone rock dust to inertize explosive coal dust deposits created during the mining process. Rock dusting creates a cloud of nuisance dust downwind, preventing other work in the area. Applying a wet or foam mix of rock dust eliminates the nuisance dust, but may impact the dispersion and explosion prevention capability and thus, may render the rock dust ineffective. Dispersibility tests were conducted in a full-size mine explosion test drift at the Colorado School of Mines. Tests include dry, wet. dry-misted, and foam applications using three types of rock dust: conventional, hydrophobic, and rock dust meeting stricter German specifications. Results show that dried dust forms large, agglomerated particles that may not be effective in suppressing coal dust explosions. Hydrophobic rock dust maintains better dispersibility even when applied wet or applied dry then misted. German specification dust disperses better than U.S. conventional rock dust.
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机译：地下煤矿将精细粉碎的石灰岩岩尘应用于采矿过程中创建的爆炸性煤尘沉积物。 Rock Dusting创造了令人讨厌的灰尘云，防止了该地区的其他工作。涂抹岩尘的湿润或泡沫混合消除了滋扰粉尘，但可能影响分散和防爆能力，因此可能会使岩石尘埃无效。在科罗拉多省矿山学院的全尺寸矿爆炸试验漂移中进行了分散性试验。试验包括干燥，潮湿。使用三种类型的岩石粉尘的干雾和泡沫应用：常规，疏水和岩石粉尘会议更严格的德国规格。结果表明，干燥的粉尘形成大，凝聚的颗粒，在抑制粉煤粉尘爆炸方面可能没有有效。即使涂覆湿润或涂抹干燥，疏水岩尘也保持更好的分散性，然后涂抹干燥。德国规范粉尘比美国常规岩尘更好。
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