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1975年1月,广东某露天矿在铜室大爆破中发生了一次迟爆事故。这次爆破采用92.4.4铵油炸药,阜新十二厂产的过期电雷管(据称拒爆率70％)。两个药室(药量分别为1.8吨和0.6吨)和80个地脚孔同时起爆。药室用4个电雷管并联起爆,并在炸药周围加5个火雷管助爆。起爆后,1.8吨药室拒爆,但经过约20分钟,人员前往检查时,又突然爆炸。事故发生后,为查明迟爆原因,曾用同批电雷管和炸药进行试验,证明这些雷管不能起爆炸药,但能使炸药爆燃,产生棕色烟雾。
In January 1975, an open-pit mine in Guangdong in the copper chamber explosion occurred in a late blast accident. The blasting using 92.4.4 ammonium oil explosives, Fuxin 12 plant outdated electric detonator (allegedly refused to burst rate of 70%). Two drug rooms (1.8 tons and 0.6 tons respectively) and 80 foot holes were detonated at the same time. Pharmacy with four electric detonators in parallel detonated, and in the explosives plus 5 fire detonators help burst. After the detonation, 1.8 tons of drug rooms refused to burst, but after about 20 minutes, officers went to check and suddenly exploded. After the accident, in order to find out the cause of detonation, the same batch of electric detonators and explosives were used to test that these detonators could not start explosives but could deflagrate explosives and produce brown smoke.