Safety of Slurry Explosives for Use in Coal Mines

KOGA Yutaka, TESHIMA Toshiyuki, TANAKA Makoto, INOUE Kunizo, WADA Ryoma, MATSUGUMA Taro, ISEI Takehiro, TASHIRO Jo

doi:10.2473/shigentosozai1953.102.1176_71

To compare the new type slurry explosives with conventional type permitted explosives, the safety tests were performedb y several series of the suspension method and the mortar and the angle shot mortar methods. From the experimental results and the consideration on the effect of blending contents, detonation velocity, and specific gravity of the slurry explosives, wecon clude as follows:<BR>1) The 400g class and the 600g class slurry explosives are both inferior to those of the conventional explosives in the safety on suspension method.<BR>2) On the angle shot mortar test of Eq.S-1 class, the slurry explosives are also inferior to the conventional ones. By the enactment about the new explosives safety test method for the permissible slurry explosives, however, several new slurry explosives have had the same safety standards to the conventional explosives.<BR>3) Through the experiments and the discussion of the results, following analytical relations between the parametric factors and the safety of slurry explosives can be concluded;(1) the ignitability of coal dust depends on the quantity of flash reducing agents or sodium nitrate, (2) methane ignitability changes with the ratio of water and salt, the ratio of ammonium nitrate and water or the ratio of ammonium nitrate and aluminum powder, and (3) methane ignitability also changes with the increase or the decrease of the density of slurry explosives.

Safety of Slurry Explosives for Use in Coal Mines

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