The importance of it in safety production of coal mine was discussed through accident case, according to theory of blasting powder and function of stemming.

本文根据炸药的作功原理和炮眼封泥的作用，通过事故案例，论述炮眼封泥质量在煤矿安全生产中的重要性。

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Combining the chemical cleaning and air blasting method, this paper introduces a new method of removing the deposit resulting from the shift gas and catalyst powder, etc.

采用化学清洗和空气爆破相结合的方法，清除换热器中由变换气及催化剂粉末等形成的垢物，降低换热器的阻力，提高热效。

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Pre-splitting blasting experiments were carried out to obtain normal pre-splitting blasting parameters such as hole diameter, hole space, gun- powder charge line density, and uncoupling factor.

通过大量的预裂爆破试验，得出了适用于该边坡的炮孔直径、炮孔间距、线装药密度、不耦合系数等一系列常规预裂爆破参数。

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But it is not easy to get at. Specks of gold embedded in the mountain rock can only be extracted by blasting and crushing the rock to powder.

VOA: standard.2010.04.22

Common uses for black powder include as gunpowder in muzzle-loading guns, as a blasting powder and as a propellant in rockets for fireworks.

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