ANFO explosives is a simple mixture of ammonium nitrate
and fuel oil , also known as ammonium nitrate - fuel oil explosives
. Granular ANFO , ammonium nitrate and fuel oil, its porous granular ratio of 94.5:5.5 , totally , this ratio exothermic reaction volume . Powdered ANFO flour is added to the formulation , the ratio was 92% ammonium nitrate and fuel oil 4% 4% wood flour , outdoor ANFO is ammonium nitrate from 92 %, 3% and 5% of diesel flour composition , if selected porous granular ammonium nitrate , a system of production Lu was porous granular ANFO , using its aperture fuel oil adsorption capillary action live . Typically the effective porosity 0.07cm2 / g , it can absorb about 6% fuel oil , charge density of the product is generally 0.80 ~ 0.85g/cm3. Under conditions of large- diameter detonation velocity is 4300 ~ 4500m / s.
ANFO rich source of raw materials , low cost , easy to manufacture , safe operation and easy to use. Once invention, development and application of extremely active , and soon occupied the main market of industrial explosives , heavy use of ANFO instead of in the mining , quarrying and mining take buy special low- salt areas of explosives, ammonium nitrate and fuel oil at the same time and even anti- into the drilling machine to use. Its main drawback is easy to absorb moisture and are water purification , fire -sensitive , easy to produce static electricity , filling low density, small blast force , the surfactant is added ANFO , the better.
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