Study of the Explosion Efficiency of New Liquid Explosives Based on Ammonia Nitrate and Coal Fuel
S.-Z. Du1, X.-G. Wang2, H. Dong3, G.-M. Gao1, X. Wu1, Q. Wang4, R.-C. Fan1
1CHN Energy Zhunneng Group Co., Ltd, Ordos, China
2Beijing General Research Institute of Mining and Metallurgy, Beijing, China
3Sanyi (Hainan) New Materials Co., Ltd, Hainan, China
4School of Chemical and Blasting Engineering, Anhui University of Science and Technology, Huainan, China
Keywords: coal-based liquid fuel, ammonium nitrate-based explosive, blast efficiency, industrial application
Abstract
A new type of ammonium nitrate-based explosive is presented, prepared by replacing diesel fuel with liquid coal fuel (coal atomized in water). Experimental results show that the higher the calorific value of the raw coal, the higher the detonation velocity of the new liquid explosive. For example, with a liquid coal fuel content of approximately 9-12% and a calorific value of 5,500 kcal/kg, the efficiency of the new explosive is relatively stable and achieves improved parameters: velocity equals 2,800-3,000 m/s, brisance increased by approximately 7-10%, and the work performed increased by approximately 8-24% compared to an explosive made from ammonium nitrate and diesel fuel. Minimal changes in the physical and chemical properties were observed during 30-day storage. At the same time, the blast efficiency of this explosive was significantly improved by adding composite additives consisting of a new coal-based fuel, diesel fuel, and an emulsifier. Blast tests under industrial production conditions were conducted at the Heidaigou open pit mine. The test results showed that the new explosive exhibits significantly improved brisance and greater work-producing capacity compared to ammonium nitrate- and diesel-based explosives.
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