CS236155B1 - A method for determining the total detonation of an explosive charge in a well - Google Patents

Abstract

The purpose of the invention is to determine the correct, uninterrupted and complete detonation of an explosive charge in long boreholes intended for non-breakout relief work and at the same time to prevent dangerous uncontrolled explosions and thereby increase work safety in mining operations. The stated purpose is achieved by placing packed powdered calcium, magnesium or zinc oxide, etc., at the opposite end of the initiated column of mine-safe explosive with exchangeable ions. After the explosive has been detonated without residue, these additives chemically react with the remaining finely dispersed ammonium salts of the explosive and release ammonia, the presence of which is detected in the borehole by built-in detectors.

Description

Method for determination of complete detonation of explosive charge in borehole

The purpose of the invention is to determine the correct, uninterrupted and complete detonation of the explosive charge in long boreholes intended for non-breakaway relief work, while at the same time avoiding dangerous uncontrolled explosions and thereby increasing safety in mining operations. This is accomplished by placing packaged calcium, magnesium, or zinc oxide powder at the opposite end of the initiated column of the mine-safe exchange ion explosives. After the residual detonation of the explosive, these additives chemically react with the remaining finely dispersed ammonium salts to release the explosive. is detected in the borehole by detonating detectors.

236 155

- 1,233,153

The invention relates to a method for determining complete detonation of a blasting charge in a borehole.

Blasting operations in mines often interrupt the detonation of the charge or even the failure of the entire charge in the well. The causes of disrupted charge detonation can be vigorous. Detecting and demonstrating complete or imperfect detonation, especially in long boreholes designed for unbreakable blasting, is difficult and generally impossible. In addition, locating the load cells in the well is a very dangerous and time-consuming operation that temporarily excludes further work in the workplace. At present, radionuclides, which are detected in the massif or in the fired mine, are tested by means of a radiometric method. The disadvantage of this method is primarily the difficulty of detecting radiation in boreholes by means of a radiometer and insufficiently proven harmless effect of radioactive substances on the human organism.

The aforementioned shortcomings eliminate the method for determining the complete detonation of a blasting charge in a borehole, which consists in a blasting of calcium, magnesium or zinc oxide powder in the borehole prior to the initiated blasting columns 8 for non-breaking blasting, and subsequently indicating released ammonia.

The advantage of the method for the determination and demonstration of a complete detonation of an explosive in a borehole, particularly in long boreholes intended for trenchless blasting work, lies in its simplicity and reliability and minimum cost.

- 2,233,155

The use of ammonia as a detection aadium does not have a deleterious effect on health at concentrations sufficient to detect the presence of ammonia. The ammonia in the borehole will be released if calcium soap, or magnesium, zinc, etc. powder is added to the end of the charge stack. When this explosive is fired in this category, a chemical reaction of the explosive and anionic salts of the explosive and flowing with caustic zeain oxides will occur. The following may be described for the formation of ammonia.

2NH ₄ NO ₃ ♦ CaO Ca (NO ₃ ) ₂ + 2NH ₃ ♦ HgO, ie, the reaction of two aaA and one aaa and one aaa of calcium oxide produces one aa of calcium nitrate, two ammonia oles and one aol of water. With the addition of magnesium oxide or zinc oxide, the course of the reaction is analogous.

In practice, this procedure applies to the fact that said chemicals are deposited in an amount of 15 to 20 grams per well of the apertured or otherwise packaged mold at the opposite end of the explosive column in long wells intended for baslographic relief blasting. After the destruction of the packaging and the scattering of oxides in the case of a complete detonation of the explosive, e the resulting ammonia detects either the drilling of the borehole or in the atmosphere of the reader suitable! detectors.

Claims (1)

SUBJECT OF THE INVENTION 235 155 Method for determining the complete detonation of a blasting charge in a borehole characterized in that a calcium, magnesium or zinc oxide powder is leaked in the borehole before the initiated blasting column 8 for the unleaded reliever tear-off work, and subsequently the released ammonia is indicated.