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WO2021014329A1 - Lance de matrice d'explosifs - Google Patents

Lance de matrice d'explosifs Download PDF

Info

Publication number
WO2021014329A1
WO2021014329A1 PCT/IB2020/056788 IB2020056788W WO2021014329A1 WO 2021014329 A1 WO2021014329 A1 WO 2021014329A1 IB 2020056788 W IB2020056788 W IB 2020056788W WO 2021014329 A1 WO2021014329 A1 WO 2021014329A1
Authority
WO
WIPO (PCT)
Prior art keywords
sensitizer
tube
emulsion
lance
inlet
Prior art date
Application number
PCT/IB2020/056788
Other languages
English (en)
Inventor
Hans Jurgens FOURIE
Original Assignee
Killassy, Timothy Joseph
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 Killassy, Timothy Joseph filed Critical Killassy, Timothy Joseph
Publication of WO2021014329A1 publication Critical patent/WO2021014329A1/fr

Links

Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F42—AMMUNITION; BLASTING
    • F42D—BLASTING
    • F42D1/00—Blasting methods or apparatus, e.g. loading or tamping
    • F42D1/08—Tamping methods; Methods for loading boreholes with explosives; Apparatus therefor
    • F42D1/10—Feeding explosives in granular or slurry form; Feeding explosives by pneumatic or hydraulic pressure
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F42—AMMUNITION; BLASTING
    • F42D—BLASTING
    • F42D1/00—Blasting methods or apparatus, e.g. loading or tamping
    • F42D1/08—Tamping methods; Methods for loading boreholes with explosives; Apparatus therefor
    • F42D1/14—Hand-operated tamping or loading

Definitions

  • This invention relates to a lance used to mix and deliver an explosives matrix.
  • Explosives are widely used in underground mining operations. These mines extend to great depths and their work faces may be located at great distances from their shafts. This necessitates continuous transport of explosives from secure storage areas to mine work faces.
  • pumpable emulsion explosives also called an explosives matrix
  • Such pumpable explosives are insensitive to initiation prior to sensitization they are classified as UN Class 5.1 , and as such are free from many of the regulations imposed on Class 1 explosives.
  • the explosives matrix comprises two separate components, namely a base emulsion or gel that forms the main component of the explosive and a secondary sensitizer or accelerator component.
  • the base emulsion and the sensitizer are both classified as non-detonable and non explosive, respectively.
  • the base emulsion comprises, typically, a mixture of two immiscible liquids and an emulsifier.
  • the sensitizer is an aqueous or emulsified liquid, which, when added to the base emulsion and mixed, creates an explosives matrix in the blast hole.
  • the base emulsion and sensitizer are transported separately to the blast hole and mixed upon pumping it into the blast hole.
  • the safe delivery of an explosives matrix into a blast hole is equally important to the mixing of the components to it to form the matrix.
  • the optimum performance of such explosives matrix depends on thorough mixing of the base emulsion and sensitizer. Malfunction of an explosives matrix may occur for a number of reasons, one of which is insufficient mixing of the matrix components. This leads to unpredictability of blasting results, and may contribute to problems such as fragmentation, overbreak and dilution, which impacts on mine profitability by influencing, at least, downstream processing of mined ore. Predictability is essential for blasting operations, and an explosives matrix that is delivered into a blasthole in less than optimally mixed condition negatively affects blasting predictability.
  • an explosives matrix lance comprising a housing provided with - attachment means for an emulsion supply tube and attachment means for a sensitizer supply tube,
  • a receiving chamber for receiving emulsion and sensitizer from an emulsion supply tube and a sensitizer supply tube operatively connected to the housing, and a delivery tube extending from the receiving chamber;
  • sensitizer supply tube attachment means extending into a sensitizer inlet having an opening located in the receiving chamber
  • the delivery tube including a plurality of baffles to form an inline mixer for mixing emulsion and sensitizer to form an explosives matrix in the delivery tube for delivery thereof into a blast hole.
  • the housing comprises a cylindrical tube, for the receiving chamber to include an emulsion receiving chamber and a sensitizer receiving chamber; with the emulsion receiving chamber comprising a right circular cylindrical passage extending from the emulsion supply tube attachment means;
  • the sensitizer receiving chamber comprising a circular cylindrical venturi chamber with - an emulsion inlet extending from the emulsion receiving chamber
  • sensitizer inlet extending from the sensitizer supply tube
  • the sensitizer inlet comprises a right circular cylindrical tube extending at a right angle to the longitudinal axis of the venturi chamber
  • sensitizer inlet tube terminating in an outlet end that is cut to form an end-face orientated at an angle to the longitudinal axis of the sensitizer inlet tube.
  • the outlet end of the sensitizer inlet tube is cut at an angle of about 45° to the longitudinal axis of the sensitizer inlet tube, and preferably for the centre of the sensitizer inlet opening end-face to be located at a position where it intersects the longitudinal axis of the venturi chamber, and more preferably for the sensitizer inlet opening end-face to be directed at the outlet of the venturi chamber.
  • the emulsion supply tube attachment means to comprise a screw threaded tube extending from the operative rear end of the housing, enabling a complimentary coupling at an end of an emulsion supply tube to be secured to it.
  • baffles comprise a series of members extending from the inner wall of the delivery tube towards the centre of the delivery tube, and with each of the baffles having at least one edge at least directed to the venturi chamber, operatively for emulsion and sensitizer that move through the delivery tube over the baffle edges to be deflected and mixed by the baffles, ad preferably for each baffle to have a curved surface at least partly facing the venturi chamber.
  • the explosives matrix lance to include a handle and for the sensitizer inlet tube to extend at a right angle through a side wall of the lance adjacent the handle into the venturi chamber, with the sensitizer inlet tube having an inlet end that terminates in an elbow fitted with a screw threaded end directed towards the operative rear end of the housing, enabling a complimentary coupling secured to the end of an sensitizer supply tube to be secured to it an axial alignment with an emulsion supply tube secured to the rear end of the housing.
  • the delivery tube to include a nozzle extending from it, with the nozzle comprising a flexible tube.
  • Figure 1 is a photograph of an explosives matrix lance according to the invention, secured to emulsion and sensitizer supply tubes;
  • Figure 2 is a cross sectional side view of part of the lance of Figure 1 ;
  • Figure 3 is a sectional end view of the inside of the lance of Figure 1.
  • An explosives matrix lance (1) comprises a housing in the form of a cylindrical tube (2).
  • the tube (2) includes, at an operative rear end thereof, attachment means (3) for an emulsion supply tube (4), a handle (5), and attachment means (6) for a sensitizer supply tube (7), and a delivery tube (8) at the operative front end of the lance (1).
  • the attachment means (3) for the emulsion supply tube (4) comprises a screw threaded end to the tube (2) which allows a complimentary screw threaded coupling (9) on the end of the emulsion supply tube (4) to be screwed onto the rear of the lance (1).
  • the handle (5) is secured to the operative bottom of the tube (2) with the attachment means (6) for the sensitizer supply tube (7) extending from the tube (2) to the operative rear of the handle (5).
  • This attachment means (6) includes a screw threaded end which allows a complimentary screw threaded coupling (10) on the end of the sensitizer supply tube (7) to be screwed to the lance (1).
  • the delivery tube (8) includes at its opposing operative front end a flexible delivery nozzle (15) that is extendable into a drilled blasthole (not shown) to allow mixed and sensitised explosives matrix to be pumped directly into such a blast hole.
  • the tube (2) includes a receiving chamber which comprises an emulsion receiving chamber (11) and a sensitizer receiving chamber (12).
  • the emulsion receiving chamber (11) comprises a right circular cylindrical passage (16) extending from the emulsion supply tube attachment means (3).
  • the sensitizer receiving chamber (12) comprises a circular cylindrical venturi chamber (17) extending from the emulsion receiving chamber (11) to the delivery tube (8).
  • the venturi chamber (17) has an emulsion inlet (20) extending from the emulsion receiving chamber
  • the emulsion receiving chamber (11), sensitizer receiving chamber (12) and delivery tube (8) are all axially aligned.
  • the emulsion receiving chamber (11) and delivery tube (8) have similar internal diameters.
  • the sensitizer inlet opening (14) is located centrally in the sensitizer receiving chamber (12), i.e. centrally in the venturi chamber (17).
  • the sensitizer attachment means (6) includes a sensitizer supply tube (13) that extends to a sensitizer inlet opening (14) that is located centrally into the sensitizer receiving chamber
  • the sensitizer inlet opening (14) is provided with an angled end-face (19), which directs the sensitizer inlet opening end-face (19) into the venturi chamber and longitudinally aligned with it.
  • the end-face (19) is directed at the outlet of the venturi chamber, i.e. at the delivery tube (8).
  • the delivery tube (8) is provided with an in-line mixer (18) which includes a plurality of baffles inside the delivery tube (8).
  • emulsion and sensitizer supply lines (4, 7) are connected to the emulsion attachment means (3) and the sensitizer attachment means (6) respectively.
  • Emulsion and sensitizer are supplied in a predetermined ratio for the and sensitizer to correctly sensitize the emulsion.
  • Emulsion enters the lance (1) through the emulsion attachment means (3) and moves through the rear of the tube (2) into venturi chamber (12).
  • Sensitizer enters the lance (1) through the sensitizer attachment means (6) and out of the sensitizer inlet opening (14) into the centre of the emulsion that fills the venturi chamber (12).
  • the venturi chamber (12) Due to the venturi effect an area of relative low pressure is created in the venturi chamber (12) which assists in drawing sensitizer into the centre of the stream of emulsion passing through the venturi chamber (12). If the opening (14) was directed in the opposite direction, i.e. at the inlet of the venturi chamber, a high pressure zone would be created at the opening (14) which would inhibit flow of sensitizer into the sensitizer receiving chamber (12). Since the sensitizer is delivered into the centre of the stream of emulsion and directed to be longitudinally aligned with the flow of the emulsion through the venturi chamber (17), the sensitizer is positioned centrally inside the stream of emulsion before it reaches the in-line mixer (18).
  • the combined emulsion and sensitizer stream which creates an explosives matrix stream, is then mixed by the in-line mixer (18) with the shearing action that the baffles of the in-line mixer delivers onto the matrix stream. Through repeated passages over baffles the matrix stream is repeatedly separated and mixed. By the time the matrix stream reaches the front end of delivery tube (8) it is completely mixed. This means the sensitizer is uniformly distributed through the emulsion which enables the emulsion to provide reliable and predictable explosive performance.

Landscapes

  • Life Sciences & Earth Sciences (AREA)
  • General Life Sciences & Earth Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Colloid Chemistry (AREA)

Abstract

L'invention concerne une lance de matrice d'explosifs (1) comprenant un boîtier comprenant des moyens de fixation (3) pour un tube d'alimentation en émulsion (4) et des moyens de fixation (6) pour un tube d'alimentation en sensibilisateur (7), une chambre de réception pour recevoir l'émulsion et le sensibilisateur et un tube de distribution (8) s'étendant à partir de la chambre avec le tube de distribution (8) pourvu d'un mélangeur en ligne (18) comprenant une pluralité de déflecteurs situés dans le tube de distribution (8) pour mélanger une émulsion et un sensibilisateur reçus afin de former une matrice d'explosifs et distribuer la matrice d'explosifs dans un trou de mine ; avec les moyens de fixation (6) de tube d'alimentation en sensibilisateur (7) s'étendant dans une entrée de sensibilisateur ayant une ouverture (14) située centralement dans la chambre (12) et axialement alignée avec le tube de distribution (8).
PCT/IB2020/056788 2019-07-19 2020-07-20 Lance de matrice d'explosifs WO2021014329A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
ZA201904746 2019-07-19
ZA2019/04746 2019-07-19

Publications (1)

Publication Number Publication Date
WO2021014329A1 true WO2021014329A1 (fr) 2021-01-28

Family

ID=74193814

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/IB2020/056788 WO2021014329A1 (fr) 2019-07-19 2020-07-20 Lance de matrice d'explosifs

Country Status (1)

Country Link
WO (1) WO2021014329A1 (fr)

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0338707A1 (fr) * 1988-04-21 1989-10-25 Aeci Limited Procédé et appareil pour charger des charges explosives dans des fourneaux de mine
ZA200908936B (en) * 2008-09-17 2010-10-27 Anmar Trust Charge lance for pumpable explosives
CN103204751A (zh) * 2013-04-18 2013-07-17 湖南长斧众和科技有限公司 一种乳化炸药装药机
CA2825166A1 (fr) * 2013-02-07 2013-10-31 Dyno Nobel Inc. Systemes de distribution d'explosifs et procedes connexes

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0338707A1 (fr) * 1988-04-21 1989-10-25 Aeci Limited Procédé et appareil pour charger des charges explosives dans des fourneaux de mine
ZA200908936B (en) * 2008-09-17 2010-10-27 Anmar Trust Charge lance for pumpable explosives
CA2825166A1 (fr) * 2013-02-07 2013-10-31 Dyno Nobel Inc. Systemes de distribution d'explosifs et procedes connexes
CN103204751A (zh) * 2013-04-18 2013-07-17 湖南长斧众和科技有限公司 一种乳化炸药装药机

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