US2046194A - Blasting charge - Google Patents

Blasting charge Download PDF

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Publication number
US2046194A
US2046194A US712051A US71205134A US2046194A US 2046194 A US2046194 A US 2046194A US 712051 A US712051 A US 712051A US 71205134 A US71205134 A US 71205134A US 2046194 A US2046194 A US 2046194A
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US
United States
Prior art keywords
charge
exothermic
pressure
container
blasting
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
Application number
US712051A
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English (en)
Inventor
Taylor James
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Imperial Chemical Industries Ltd
Original Assignee
Imperial Chemical Industries Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Imperial Chemical Industries Ltd filed Critical Imperial Chemical Industries Ltd
Application granted granted Critical
Publication of US2046194A publication Critical patent/US2046194A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F42—AMMUNITION; BLASTING
    • F42B—EXPLOSIVE CHARGES, e.g. FOR BLASTING, FIREWORKS, AMMUNITION
    • F42B3/00—Blasting cartridges, i.e. case and explosive
    • F42B3/04—Blasting cartridges, i.e. case and explosive for producing gas under pressure
    • F42B3/06—Blasting cartridges, i.e. case and explosive for producing gas under pressure with re-utilisable case

Definitions

  • Explosives such as are used for blasting are characterized by their capacity to undergo rapid exothermic reaction when suitably ignited or initiated, so as to yield hot gases capable of exerting pressure and doing work.
  • the object of the present invention is to provide a method whereby exothermic reactions resulting in the production of adequate energy for the purpose of blasting are effected in the presence of water in such a manner that while maximum safety may be ensured the power resulting from the reaction is utilized in a really efiective manner.
  • the exothermic reactions which I utilize are not of sufficient rapidity to result in explosion when they are carried out in the open, but according to my invention the reaction is caused to proceed within a rigid container capable of with standing considerable pressure before venting occurs.
  • a particularly suitable type of rigid container for the purpose of my invention is one provided with a venting system such as a bursting disc held in position by a screwed-in cap provided with a plurality of openings for the discharge of the gases after the disc has burst.
  • the venting member may take the form of a valve, in either case the container being provided with means to determine that venting shall take place at a considerable and predetermined pressure.
  • the source of heat provided within the container may take the form of an electric resistance heating element, or a composition capable of com- 5 bustion when suitably ignited or initiated, an electric are or a non-detonating explosive charge.
  • an explosive charge or heater mixture used for promoting the reaction it may be contained in a, waterproof case in the con- 10 tainer in such a way that the liquid partly or completely surrounds it, or it may be contained in a separate rigid container attached to or screwed into the reaction container and separated therefrom by means of a suitable temporary closure l5 member.
  • the quantity used is so chosen that the pressure it generates by itself is insufficient to cause venting. In this manner it is ensured that the hot products from the.eXplosive or heater charge are mixed with the water before venting occurs so that there is no danger of the liquid being shot out like a projectile before reaction occurs.
  • the invention is thus capable of providing a safe method of blasting in fiery or dusty mines.
  • the substance or mixture used for producing the exothermic reaction may be introduced along with the water in the form of a solution, a paste, a suspension, or the like liquid mass, and it will be understood that the substances which may be chosen for producing the exothermic reaction are very numerous.
  • a solution of ammonium nitrite in water or a solution containing a mixture of sodium nitrite and ammonium chloride, again a solution of ammonium nitrate may be used, or a mixed solution of urea and sodium nitrite, or mixtures of hydrogen peroxide and organic liquids such as alcohol.
  • the above examples are particularly favourable since the reactions give rise not only to heat but to the evolution of gases.
  • Figs. 1 and 2 are longitudinal sectional views of two forms of the device suitable for carrying out my invention. The following is a description of Figure 1.
  • I trode (l) is such as to allow no gas leakage at I pressures up to about 25 tons per sq. in. Terminals (to)and(lil areprovided for the elec- I trodes, which are used in initiating the cartridge I electrically.
  • the heater charge (I3) vcomprises a charge of blackpowder contained in agwaterproof Icylin- I 'der and contains a5 grain powder fuseor other I igniter l2).
  • An electric powder fuse or other igniter is connected by its wire leads to the electrodes ('I) and (8), and the heater charge (I3)-- for example one of blackpowder-is introduced into the cylinder (I) as shown, and need not be wrapped.
  • a fibre or like waterproof disc (l5) designed to withstand only very low pressures, and held in position by the screwed-in end of a second shouldered steel cylinder (l4) into which the charge ([1) of the exothermic liquid medium is introduced.
  • the fibre or like cylinder washer (6) the steel bursting disc (5) and the hollow screwed-in cap (4) are positioned at the shouldered'end of the container (l4) as in Figure 1.
  • the charge (l3) of powder is insufficient in amount to cause the rupture of the disc (5) when the charge (ll) of liquid is-replaced by an equal volume of water.
  • I I I calories and consisting of an :20 mixture of potassium perchlorate vand a phenolic resin.
  • I I I I 1 A blasting device comprising a pressure-rupturable vessel and a charge of an aqueous solution of an ammonium salt capable of undergoing exothermic decomposition, said charge being 45 confined within said pressure-rupturable vessel, and means for initiating the decomposition of said ammonium salt.
  • a blasting device comprising a pressure-resisting shell and a charge of an aqueous medium 50 containing a gas-generating material which is capable of undergoing exothermic decomposition, said charge being confined within said pressureresisting shell, said shell having a release member adapted to permit the escape of the gases at 55 a predetermined and considerable pressure, and means for initiating the decomposition of said gas-generating material.
  • a blasting device comprising a pressurerresisting shell and a charge of an aqueous solution 60 of a gas-generating material which is not in itself an explosive when unconfined, but which is capable of undergoing exothermic decomposition, said charge being confined within said pressureresisting shell, which shell has a release member 65 adapted to permit the escape of the gases at a predetermined and considerable pressure, and means for initiating the decomposition of said gas-generating material.
  • a blasting device comprising a pressure-re- 70 sisting shell and a charge of an aqueous solution of a gas-generating material which is capable of undergoing exothermic decomposition, said charge being confined within said pressure-resisting shell, said shell having a release member 76
  • the container was of 330 c. c. capacity 25 I a bursting disc'venting at 12 tons per sq.Iin.
  • a I I I I waterprooied heating cartridge containing 33 I blackpowderwith a 5 grain powder fuse as igniter I I was introduced into the container.
  • the exo- I I thermic aqueous mixturewasmade lay-dissolving 30 in c. c.
  • a blasting device as set forth in claim 3, comprising a charge of an aqueous solution of which at least one substance is itself capable of undergoing exothermic decomposition.
  • aqueous liquid medium consists of a solution containing an alkali nitrite and a substance selected from the group consisting of urea and ammonium salts.
  • a blasting device comprising a pressure-resisting cylindrical shell having plugs at both ends, one of said plugs co-operating with a pressurerupturable disc to seal the one end of the cylinder until the internal pressure rises to a predetermined value, and being adapted to release the gases into the borehole in which the device is placed and the other of said plugs being adapted to seal the other end of the cylinder and to convey current to a pair of electrical leads;
  • a heating cartridge located within the said cylinder, said cartridge containing an igniter adapted to be fired electrically and having electrical leads connected to the last-mentioned plug; and a charge of aqueous liquid medium located within the said cylinder and containing a gas-generating material which is adapted to give rise to an exothermic reaction accompanied by the evolution of gas when initiated by the said heating cartridge.
  • a blasting device comprising a pressure-resisting cylinder shell having plugs at both ends, one of said plugs co-operating with a pressurerupturable disc to seal the one end of the cylinder until the internal pressure rises to a predetermined value and being adapted to release the gases into the borehole in which the device is placed, and the other of said plugs being adapted to seal the other end of the cylinder and to convey current to a pair of electrical leads, said shell being divided into two compartments by means of a disc adapted to rupture at a comparatively low pressure; a heating composition located within the compartment next to the last-mentioned plug; a fuse having electrical leads connected to the said last-mentioned plug, said fuse being in effective contact with said heating composition; and a charge of aqueous liquid medium within the compartment adjacent to the first-mentioned plug and containing a gas-generating material which is adapted to give, rise to an exothermic reaction accompanied by the evolution of gas when initiated by the said heating composition.

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  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Air Bags (AREA)
  • Feeding, Discharge, Calcimining, Fusing, And Gas-Generation Devices (AREA)
  • Pharmaceuticals Containing Other Organic And Inorganic Compounds (AREA)
US712051A 1933-12-15 1934-02-19 Blasting charge Expired - Lifetime US2046194A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB35399/33A GB431936A (en) 1933-12-15 1933-12-15 Improved blasting charge and method of blasting

Publications (1)

Publication Number Publication Date
US2046194A true US2046194A (en) 1936-06-30

Family

ID=10377292

Family Applications (1)

Application Number Title Priority Date Filing Date
US712051A Expired - Lifetime US2046194A (en) 1933-12-15 1934-02-19 Blasting charge

Country Status (5)

Country Link
US (1) US2046194A (en))
BE (1) BE406739A (en))
DE (1) DE651288C (en))
FR (1) FR782746A (en))
GB (1) GB431936A (en))

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2609751A (en) * 1946-07-26 1952-09-09 Ici Ltd Safety blasting operation and blasting assembly for use therein
US2794396A (en) * 1953-11-02 1957-06-04 Ici Ltd Blasting devices

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
BE504789A (en)) * 1950-07-20
BE524825A (en)) * 1952-12-05
BE528505A (en)) * 1953-04-30

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2609751A (en) * 1946-07-26 1952-09-09 Ici Ltd Safety blasting operation and blasting assembly for use therein
US2794396A (en) * 1953-11-02 1957-06-04 Ici Ltd Blasting devices

Also Published As

Publication number Publication date
BE406739A (en))
FR782746A (fr) 1935-06-11
DE651288C (de) 1937-10-11
GB431936A (en) 1935-07-15

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