Classifications

• • C—CHEMISTRY; METALLURGY
  • C06—EXPLOSIVES; MATCHES
  • C06B—EXPLOSIVES OR THERMIC COMPOSITIONS; MANUFACTURE THEREOF; USE OF SINGLE SUBSTANCES AS EXPLOSIVES
  • C06B31/00—Compositions containing an inorganic nitrogen-oxygen salt
  • C06B31/28—Compositions containing an inorganic nitrogen-oxygen salt the salt being ammonium nitrate
  • C06B31/285—Compositions containing an inorganic nitrogen-oxygen salt the salt being ammonium nitrate with fuel oil, e.g. ANFO-compositions
• • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
  • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
  • Y10S—TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
  • Y10S149/00—Explosive and thermic compositions or charges
  • Y10S149/11—Particle size of a component
  • Y10S149/112—Inorganic nitrogen-oxygen salt

Definitions

• the invention relates to a method for the manufacture of the NH NO -containing component of an ammonium nitrate-containing explosive of high detonation speed.
• the fraction of the ground material having a particle size from 0.05 to 0.125 mm. is sieved out for the above purpose.
• This fraction Patented Jan. 26, 1971 is condensed by pressure, in any desired manner, into a mass having a porosity, expressed as the oil uptake without leaving a residue, of at least 10% by Weight, and the material is then comminuted into particles having a size of 0.5 to 2 mm. and impregnated with a liquid carbonaceous filler, for example, spindle oil or diesel oil.
• an ammonium nitrate-containing explosive of high detonation speed which comprises ammonium nitrate having an open porosity, as hereinbefore defined, of at least 10% by weight, impregnated with a nonexplosive, liquid carbonaceous filler in an amount which stoichiometrically corresponds to the desired oxygen balance in the explosive.
• the high open porosity of the ammonium nitrate produced in the manner described above is the prerequisite for achieving a detonation speed which is significantly increased relative to the normal standard, inasmuch as according to a further characteristic of the invention the sieved and comminuted compressed material is not completely impregnated with oil, i.e. until the open pore space is entirely filled, but rather it is only impregnated with such a quantity of a liquid, non-explosive carbonaceous filler, such as diesel oil or spindle oil as stoichiometrically corresponds to the desired oxygen balance of the explosive.
• a liquid, non-explosive carbonaceous filler such as diesel oil or spindle oil as stoichiometrically corresponds to the desired oxygen balance of the explosive.
• an amount of 5.5 to 6% by weight of the carbonaceous filler, e.g. oil suffices for this purpose.
• detonation speeds of at least 3000 m./ sec. are achieved, which can even be increased up to 3500 m./sec. In order to achieve this high detonation speed it is not necessary either to add absorptive substances or other explosives.
• the ammonium nitrate-oil explosive of high detonation speed of the invention is thus primarily characterized by consisting of ammonium nitrate of open porosity of approximately 10% by weight and above and only such quantity of a liquid, non-explosive, carbonaceous carrier, such as diesel oil or spindle oil as is necessary to set up the desired oxygen balance of the explosive, preferably 5.5 to 6% by weight.
• a liquid, non-explosive, carbonaceous carrier such as diesel oil or spindle oil as is necessary to set up the desired oxygen balance of the explosive, preferably 5.5 to 6% by weight.
• the high open porosity of the ammonium nitrate component which according to the invention is required for such an explosive is obtained from inadequately porous commercial forms of ammonium nitrate by grinding, compressing, comminution and sieving.
• a characteristic feature of the invention is the process for the manufacture of the ammonium nitrate component of the above-described explosive which comprises grinding, compressing and comminuting the starting ammonium nitrate, sieving from the resulting ground ammonium nitrate the fraction having a particle size from 0.05 to 0.125 mm., condensing this fraction into a mass having a porosity of at least 10% by weight, comminuting the said mass and sieving out from the comminuted material the fraction having a particle size from 0.5 to 2 mm.
• EXAMPLE 1 Dense ammonium nitrate prill containing 0.14% by weight of water and having an oil absorptive capacity which after immersing the prill in diesel oil and allowing it to drain for 6 hours proves to be 3.4% by weight, and
• EXAMPLE 2 Dense ammonium nitrate prills were ground as in EX- ample 1. The sieve fraction having a particle size from 0.05 to 0.125 mm. was fed into a roller press and compressed into sheets at such a high roller pressure as to result in an internal porosity (determined by oil absorp- I of this ammonium nitrate-oil mixture were introduced into a 3 m. long iron tube of 5 cm. internal diameter and 5 cm. wall thickness and detonated with a gelatine- Donarit cartridge. The detonation speeds measured at 20, and 280 cm. distance were 2,850, 3,350 and 3,400 m./sec., respectively.
• a method for the manufacture of the ammonium nitrate component of an ammonium nitrate and oil containing explosive of high detonation speed, said explosive containing 5.5 to 6% by weight of oil, from an inadequately porous commercial form of ammonium nitrate which comprises grinding the said commercial ammonium nitrate, sieving from the resulting ground ammonium nitrate the fraction having a particle size from 0.05 to 0.125 mm., compressing this fraction into a mass having a porosity of at least 10% by weight, comminuting the said porous mass and sieving out from the comminuted material the fraction having a particle size from 0.5 to 2 mm.

Landscapes

• Chemical & Material Sciences (AREA)
• Engineering & Computer Science (AREA)
• Chemical Kinetics & Catalysis (AREA)
• General Chemical & Material Sciences (AREA)
• Oil, Petroleum & Natural Gas (AREA)
• Inorganic Chemistry (AREA)
• Organic Chemistry (AREA)
• Solid-Sorbent Or Filter-Aiding Compositions (AREA)
• Lubricants (AREA)
• Production Of Liquid Hydrocarbon Mixture For Refining Petroleum (AREA)
• Processing Of Solid Wastes (AREA)

Applications Claiming Priority (1)

Publications (1)

Family

ID=3503044

Family Applications (1)

Country Status (9)

Cited By (1)

• 1966
  • 1966-02-02 AT AT92766A patent/AT279448B/de not_active IP Right Cessation
  • 1966-12-30 FI FI663489A patent/FI46372C/fi active
• 1967
  • 1967-01-20 NO NO166510A patent/NO116232B/no unknown
  • 1967-01-20 PL PL1967118612A patent/PL79091B1/pl unknown
  • 1967-01-28 ES ES0336180A patent/ES336180A1/es not_active Expired
  • 1967-01-31 BE BE693452D patent/BE693452A/xx unknown
  • 1967-02-01 FR FR93335A patent/FR1509800A/fr not_active Expired
  • 1967-02-02 NL NL6701617A patent/NL6701617A/xx unknown
• 1968
  • 1968-07-05 US US742703A patent/US3558749A/en not_active Expired - Lifetime

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