Abstract:
The present invention relates to water-in-oil emulsion explosive compositions comprising a discontinuous aqueous phase, a continuous water-immiscible organic phase, and an emulsifier content being at least 45% by weight of the emulsified fuel phase which decreases precompression or dead pressing.
Abstract:
A timing circuit 64 includes a variable frequency oscillator 106 which has a control signal that determines the output frequency of the oscillator. The control signal is stored in the circuit. A reference signal is further stored in the circuit. A precision calibration pulse 36 is applied to the timing circuit 64 which counts the output cycles of the variable frequency oscillator (106) during the period of the pulse. This count is stored and compared to the reference count to produce an error count. This error count is combined with the previously stored control signal to produce a new control signal that drives the output of the oscillator 106 to a new frequency which is closer to a predetermined timing relation with the time reference which produced the calibration pulse (36). Additional calibration pulses (A,B,C,D) are sequentially applied to the timing circuit 64 to cause the frequency of the oscillator (66) to converge toward a predetermined relation with the time reference. The timing circuit 64 can be utilized as a part of a delay circuit in an electronic blasting system wherein a control unit 12 transmits the calibration pulse concurrently to each of the delay circuits to cause each circuit to calibrate its local oscillator in accordance with the calibration pulse. One or more of such pulses can be transmitted to cause all of the delay circuit oscillators to be brought to within a required degree of synchronization of rates. The control unit transmits a delay count to each of the delay ignition circuits: A fire command is transmitted from the control unit to each of the delay ignition circuits to cause the outputs of the calibrated local oscillators to be compared to the previously received delay count until a predetermined relation is reached. When this relation is reached, each delay ignition circuit generates a fire signal which ignites a corresponding explosive element.
Abstract:
Procédé permettant d'obtenir un rendement élevé d'esters de nitrate solubles dans l'eau ou dans l'acide sans recours à des solvants organiques dans la réaction de nitratation et sans produire des produits ou des produits secondaires instables. Le procédé consiste à nitrater un composé organique à teneur en hydroxy à l'aide d'un agent de nitratation approprié tel que l'acide nitrique en l'absence de solvants organiques dans la réaction de nitratation. On neutralise le mélange réactionnel, ce qui provoque la précipitation ou la séparation des esters de nitrate de la solution de nitrate neutralisée. Ensuite, on récupère l'ester de nitrate et l'on peut en enlever tous les éventuels sels de nitrate dissous par un lavage délicat avec de l'eau ou avec une solution diluée d'halogénure. Selon le procédé, on n'utilise aucun solvant organique dans la réaction de nitratation, et les rendements moyens sont compris entre environ 80 % et environ 95 %.
Abstract:
The invention provides a connector, a transmitter, a bi-directional device, and a method for increasing the reliability of borehole detonation by using the connectors and transmitters provided by the invention. The invention provides connectors, each connector having a well for receiving a blasting cap, one or more ports or channels for receiving a transmission line and/or downline, and means for joining one connector with another connector in a convenient manner. The connectors are constructed so that detonation of a blasting cap in one connector will cause sympathetic detonation of a blasting cap in an adjoining connector. The detonation of blasting caps in the connectors also causes initiation of transmission lines and/or downlines which are inserted in the ports or channels through the connectors. A transmitter is comprised of one or more of these connectors with the transmission lines being arranged so that the transmitter receives a signal from one line and outputs it to at least one other transmission line or downline. A bi- directional device is provided that consists of a transmission line with blasting caps attached to each end and the caps are inserted into the wells of connectors as described below. The method of the present invention includes the use of the transmitters and arranging them such that there are at least two signal paths from which a transmitter may receive an initiation signal.
Abstract:
The invention provides a thermodynamically stable fluid system for use in combination with a solid oxidizer to provide an explosive composition. The fluid system comprises 1-70% by weight of water, 5-20% by weight of a surfactant, 0-35% by weight of a cosurfactant, and 5-85% by weight of an organic oil. Any droplet formation within the system has diameter or a thickness of less than or equal to about 0.1 microns. In a preferred embodiment, the fluid system is a microemulsion. When the fluid system is combined with a solid oxidizer, an explosive composition is formed, and the resulting explosive composition has a density greater than ANFO under similar conditions.. The fluid system acts to increase the density of the oxidizer.
Abstract:
The present invention provides a water-in-oil macroemulsion for use in combination with a solid oxidizer in preparing a high density explosive composition. The macroemulsion comprises 1-70% by weight of water, 5-85% by weight of a fuel oil, and 0.1-10% by weight of an emulsifier with an HLB number within the range 0-8. The invention also provides an explosive composition comprising 2-20% by weight of a water-in-oil macroemulsion as just described and 80-98% by weight of a solid oxidizer. The preferred solid oxidizer is selected from the group of ammonium nitrate, sodium nitrate, potassium nitrate, calcium nitrate, ANFO, and mixtures thereof. In addition, water soluble fuels, oil soluble fuels, or solid fuels may be added to the explosive composition. The invention further provides a method of preparing a solid oxidizer based explosive having a higher density than that obtainable in a mixture of fuel oil and the solid oxidizers.
Abstract:
The invention provides a connector, a transmitter, a bi-directional device, and a method for increasing the reliability of borehole detonation by using the connectors and transmitters provided by the invention. The invention provides connectors, each connector having a well for receiving a blasting cap, one or more ports or channels for receiving a transmission line and/or downline, and means for joining one connector with another connector in a convenient manner. The connectors are constructed so that detonation of a blasting cap in one connector will cause sympathetic detonation of a blasting cap in an adjoining connector. The detonation of blasting caps in the connectors also causes initiation of transmission lines and/or downlines which are inserted in the ports or channels through the connectors. A transmitter is comprised of one or more of these connectors with the transmission lines being arranged so that the transmitter receives a signal from one line and outputs it to at least one other transmission line or downline. A bi- directional device is provided that consists of a transmission line with blasting caps attached to each end and the caps are inserted into the wells of connectors as described below. The method of the present invention includes the use of the transmitters and arranging them such that there are at least two signal paths from which a transmitter may receive an initiation signal.
Abstract:
@ This invention relates to improved desensitized dynamites, the improvement comprising the incorporation of a desensitizing compound selected from the class of compounds known as diesters, polyesters, triesters except those esters containing benzyl rings, and dialkyl substituted amides or combinations thereof.
Abstract:
The present invention relates to water-in-oil emulsion explosive compositions comprising a discontinuous aqueous phase, a continuous water-immiscible organic phase, and an emulsifier content being at least 45% by weight of the emulsified fuel phase which decreases precompression or dead pressing.
Abstract:
Une composition explosive comprend une phase oxydante discontinue contenant au moins un composant fournissant de l'oxygène, une phase organique continue contenant au moins un liquide organique non miscible avec l'eau, et une quantité suffisante d'au moins un émulsifiant contenant de l'azote dérivé d'au moins (A) un agent d'acylation carboxylique, (B) un polyamine et (C) un acide ou un composé produisant un acide capable de former au moins un sel avec ladite polyamine. Ces compositions explosives peuvent être des émulsions d'eau dans l'huile ou mélange dans l'huile. Elles peuvent également se présenter sous forme de compositions explosives dérivées de telles émulsions dans lesquelles la phase discontinue est solide à des températures inférieures à la température de formation de l'émulsion ou sous forme de gouttelettes de liquide sur-refroidi.