"Explosion technology"— scientific and technical journal

Problems of development of explosive business on the terrestrial surface

Keywords:explosive, the facilities of initiation, the structure of alpine breed, concentrate

In article are described the perspective direction of growths of the conduct of blasting works on the earthly surface in the field of facilities of the initiation of the cartridges of explosive, of education micro- and nano-fractions in blasting destruction of mining breeds, technologies of blasting mining breeds.

Comparison of theoretical estimations of crushing of rocks by explosion to results of skilled crushing of separateness of limestone on career

Keywords:career, physic-technical properties of rocks, charges of industrial explosives, distribution of stress, formation of cracks, the average size of pieces of breed in disorder, oversize.

New common correlations are described for shaping pieces of rocks in the nearest zone about bursting charge. For explanation we used static distribution of stress about bursting charge, theory of crack and physico-technical characteristics of rocks. Also results of experiment are stated. The industrial experiments of crushing limestone are made in «Gukovo». The results of experiments are answered with offered theory.

Experimental researches of microstructural changes of samples of rocks at intensive explosive influence

Keywords:explosive influence, experiment, rocks, the sample, electronic microscopy, microparticles, structure

A procedure was developed and experiments were conducted to assess structural changes in rock specimens in the vicinity of explosion. Multiscale study of rock structure in a range from one millimeter to several hundred nanometers has been carried out by scanning electron microscopy. The study demonstrated that character of rock disintegration under conditions when the loading level was greater than rock strength by an order of magnitude or more first of all depended on rock structural characteristics.

Compression of cylindrical shell by sliding detonation wave

Keywords:compression of cylinders, detonation waves, explosives

The compression of cylindrical shell by a sliding detonation wave arising upon explosion of outer ring-shaped charge was analyzed by numerical calculation. The suggested algorithm affords relatively simple determination of the profiles of motion for both the outer and inner shell surfaces. The calculated data were found to agree with experiment.

Influence of cover material on critical diameter of detonation

Keywords:explosive, critical diameter of detonation, velocity of detonation, shell of charge

Proposed a simple method of critical diameter estimation for detonation of explosives in different shells, including various mining rocks.

About the form of rock blasting fragmented pieces

Keywords:the cube form, the sphere form, the pseudo-cube form, the pseudo-sphere form, a piece of rock, linear size, volume, surface

The article describes the new forms of pieces of the rock fragmented by blasting. Main calculation formulas which can be used to calculate parameters of the rock are presented.

Research of the hole charge's detonation at torpedoing of the difficult collapsible roof

Keywords:detonation, ammonite, torpedoing, impulse

Results theoretical and experimental researches, indicating on influence of critical pressure on process detonation of the blasting charge are resulted. Conditions of a stationary detonation velocity for charges ammonite №6GV and PGV-20 are determined.

Improved methods for the initiation of mineral extraction

Keywords:detonation, charge, demilitarization explosive materials, fragmentation

The establishment and development of new methods of mineral resources is inextricably linked with the search for new technologies, including the explosive disintegration of rocks, c using the demilitarization explosive materials (DEM). Differences in the characteristics of industrial explosives and DEM determine the need to study the processes of excitation of the practical kinds of explosive detonation impulse.

Explosive technique of activation of salt rocks for their hydraulic mining by boreholes

Keywords:salt rocks, explosion of explosive, activation, hydraulic mining by boreholes

The usage possibility of an explosion energy obtained by industry explosive charge for intensification of hydraulic mining by boreholes in a horizontal part of vertical – horizontal boreholes is shown. It is established, that salt rocks destruction depends on many factors, main of those are physical and mechanical properties of salt rocks and their burial conditions, volume concentrations of explosion energy. Zones of destruction sizes of soluble and insoluble potassium salt rocks of Verhnekams deposit and Sharlyk area are determined depending on their firmness properties and used explosives characteristics.

The method of decision the problem of ventilation deep career by cascade explosion fam

Keywords:ventilation, deep career, fuel-air mixture (FAM), atmosphere inversion

The way of ventilation deep career by cascade explosion FAM is proved. For an example results of calculations of cascade explosions FAM for small weights of fuel and in conditions of an inverse atmosphere career are submitted. Results of calculations and experiments have satisfactory convergence. In conditions of inversion the height of rise of a cloud up to 10% is less, than at a standard atmosphere.

The possibility for emulsion explosives application in sulfide rocks and ores

Keywords:emulsion explosives, sulfide ores, stability, temperature limits, induction period

The paper presents the results of laboratory investigations of emulsion explosives behavior in contact with ore having high content of sulfur. The techniques of investigations and the conditions of emulsion explosives and ore interaction are described; temperature and time limits of the reaction beginning and completion are determined.

The mixed charge of explosive for hydraulic mining by boreholes of rocks from horizontal chambers

Keywords:rocks, explosive, mixed charge, hydraulic mining by boreholes

Regulating parameters of rocks subdivision by an explosion and constructions of borehole explosives charges are analysed. The optional version of the combined charge for hydraulic mining by boreholes of rocks from the horizontal chamber surveyed.

Method of explosion and hydraulic destruction of the main roof's hanging consoles

Keywords:mine roadway, hole, roof, bursting charge, displacement, fluid infusion

The data of industrial tests of the explosion and hydraulics method of control roof condition providing effective maintenance of mine roadway are resulted.

Characteristics of blasting operations at dolomit mining pit

Keywords:blasting and drilling operations, non-electric initiation system, watercut

The article reviews blasting operations with non-electric initiation means SINV at the mines of Dolomit OJSC in the Republic of Belarus. Description of drilling and blasting operations in watercut conditions is given.

Enhancing blasting operations at kovdorskiy mining and processing plant based on non-electric initiation systems

Keywords:blasting and drilling operations, non-electric initiation system, special explosive charges

The article reviews non-electric means of blasting at Kovdorskiy Mining and Processing Plant. The author compares the efficiency of blasting with the use of detonating cord and non-electric initiation systems based on shock tube. Considerate reduction in the number of failures of non-electric initiation system is noted. The author touches upon the need of producing special explosive charges for cracking in the process of installing pit boards.

Influence of non-electric initiation systems on enhancing blasting technology

Keywords:polyethylene hose, non-electric systems, burnout of borehole charges

The author describes natural and simulated tests to examine the influence of initiation systems on explosives burn-out. It is indicated that application of non-electric systems ensures a considerable increase of borehole charges while preventing burn-out. The author promotes application of simple explosive charges in polyethylene hose under watercut conditions.

The results of the industrial tests of electric detonators with electronic set-back

Keywords:explosion, seismic influence, detonators, the schemes of initiation

In presented work are described the results of explosions with applying of electric detonators with electronic set-back versus the results of explosions with applying of the systems of the non-electric initiation of explosions.

Development of charges based on utilized elements of solid propellants for deep-water seismics in conditions of permafrost and shelf zone of arctic ocean

Keywords:seysmo-charge, dip shooting, solid elements

The paper presents consideration of seismics using explosions with application of utilized solid propellant elements. Optimum parameters are determined for maximal radiation of seismic waves in explosion of seismic charge. Parameters and physical and chemical properties of a charge for seismics are presented.

Application of mechanical and chemical technology for producing pyrotechnical compositions based on ferroalloy and non-organic oxidants

Keywords:mechanic and chemical activation, X-ray studies on phase transformations, burning speed of pyrotechnical compositions

The article describes studies on mechanic and chemical activation of pyrotechnical compositions applied in the technological process of SINV detonators. X-ray studies are held on phase transformations within processing of fuel and oxidant compositions. Burning speed discrepancy before and after mechanical processing is indicated.

Issues concerning detonation velocity determination

Keywords:detonation velocity, inorganic oxidizer, maximum diameter, density of a charge

The paper presents the approaches to increase the accuracy of experimental detonation velocity determination. The computation method of detonation velocity evaluation for explosive compositions with high content of metal fuels and inorganic oxidizers is described. Experimental determination of detonation velocity of ammonit charges 79/21 showed poor correspondence of evaluated and experimental values for diameters of charges less than 120 mm. Besides, strong influence of a charge diameter and its shell weight on detonation velocity was revealed. It was concluded that the proposed method of calculation can be used for evaluation of commercial explosives detonation velocities in the charges with diameters that more than maximum diameter of detonation.

Issue about possibility of rating emulsion used in industrial explosives production to a subclass 5.1. “Emulsion, suspension or gel of ammonium nitrate used as intermediate raw material in high explosives production”

Keywords:emultion, subclass 5.1 explosives production, transport of dangerous goods

The Issue is devoted to instrumental equipment, methods and number of tests regarding possibility of including Poremit and Amforem emulsions to subclass 5.1 «Emulsion, suspension or gel of ammonium nitrate used as intermediate raw material in high explosives production». The results of thermal stability test, detonation transfer via gap test, test on impression of intensive heating in limited space conditions and test of detonation in pipe with outlet hole (series 8, types 8a, 8b, 8c, 8d, Chapter 18 of «The Recommendations on the Transport of Dangerous Goods. Manual of Tests and Criteria», UN, Rev.4, 2003) are presented in the Issue.

Commercial booster charges as one of fgup “GOSNII “Kristall” innovation activity trends

Keywords:booster charge, drill-blast operations, initiation, casting, structure, engineering, formulation of an explosive, commercial explosives, tests

The paper presents different structural, engineering and formulation approaches, realized in the institute in the course of developing commercial booster charges for drill-blast operations in mining. The original characters of the developments are confirmed by patents.

Experience of creating plants for patronize emulsion explosives at industry factories (FSUE “DVPO “Sunrise“, Fsue “Plant “Plastic“)

Keywords:emulsion cartridges, RDX of extended storage, tests in working conditions

The production results of manufacturing emulsion cartridges where RDX of extended storage was used as sensitizer are presented. The results of «emulsen-Gsh» preliminary tests in working conditions of users are produced.

Special vehicles for joint transportation of explosives and si payload capacity of up to 1 ton (EX-II -type)

Keywords:special motor vehicle, transportation of explosives, dangerous load, initiating devices

The results of works on creation of special motor vehicle (SMV) of tone carrying capacity (EX-II type) for joint transportation of explosives and initiating devices are presented. In this paper we show testing results of containment container of 100 initiating devices (KD-8 type) content.

Seismic fluctuations in application of high-precision electronic and non-electric blasting systems

Keywords:seismic effect, electronic delay, delay optimization

The article reviews seismic studies at exploding borehole charges by EDEZ systems with electronic delay and SINV initiation at Borok mining pit and Iskitim stone quarry. Blasting seismograms are enclosed. Theoretic estimations prove the choice of optimum delay stages that minimize seismic effect on protected sites.

Application of non-electric initiation SINV-systems and electric detonators with electronic delay at “Vzryvprom yuga Kuzbassa”

Keywords:electronic delay, blasting operations

The article describes application of blasting systems with electronic delay (EDEZ) at coal mines in South Kuzbass. It is indicated that apllication of EDEZ system as a surface delay device alongside with borehole non-electric initiation system SINV provides for efficient control of the plasting procedure, increased quality and lower cost of blasting operations.

Legislative documents in the sphere of commercial explosives

Keywords:federal law, technical regulations, state control, explosives

The paper concerns the main points of the projects of new federal laws being developed: special technical regulations «On Safety of Explosives and Items Including them, the Processes of their Production, Storage, Application, Realization and Utilization» and the project of the law «On State Control over Explosives Turn-over and Items Including them». According to new requirements for technical regulations determined by Federal Law FZ-65 of 01.05.2007 the expediency of the new project of technical regulations «On Safety of Commercial Explosives and Items including them» is demonstrated.

Ignition of methane-air mixture during the detonation of explosive charges with open surface

Keywords:ignition, methane-air mixture, explosive, velocity of detonation

Provided experimental results shows that the main factor results in ignition of methane-air mixture is a velocity of detonation process of explosive charge. If velocity of detonation is equal or above 3.2 km/s then ignition will have place. If less – will not occur.

Analysis of development and test results of safety explosives for coal mines

Keywords:safety explosives, uglenit, poremit, coal mine

The necessity of developing and applying high pressure explosives with blasting in coal mines is justified. Performed analysis of disadvantages of serial production of explosives, as well as analysis of characteristics of safety explosives ETA-1, 12TSB, 12TSB – 2M, 13-P, uglenit M and poremita PP-IV-36, including new models. Results of the application and testing of safety explosives in coal mines of Kuzbass are summarized.

The investigation of ammonium nitrate decomposition plenitude diring the explosion mixture at its basis by the soil analysis

Keywords:ammonium nitrate, explosion processes, pollution, soil

The method of definition of soil pollution of ammonium nitrate by explosion ammonium nitrate has been worked aut. The influence hidh explosives of properties and the diameter of charges on the velocity of the explosive process and the contents of ammonium nitrate in the soil nave been investigated. It has been observed that at the velocity of 1,5–2,0 km/s the contents of ammonium nitrate in the soil reached 5–6% from its contents in the charge.

About seismic safety methods of near contour blocks blasting in a deep open pits

Keywords:blasthole charges, blasting, bench, stability

It is shown that blasting of the near contour blocks by reduced diameter hole charges with contour presplitting allows greatly to reduce the dynamic stress intensity of the above placed benches in their final position, and essentially reduce probability of the corner roofdowns formation and local crushing.

The formation of sulfur dioxide and its inhibition in conditions of brisant coverage of products detonation at the sulfur-containing rocks explosive destruction

Keywords:detonation, combustion, sulphide dust, the level of MPC

In work results of researches of processes gazoobrazovaniy and inhibition in an explosive cavity are submitted at a detonation granulita AC-8 and simultaneous burning of a sulphidic dust. The analysis gazoobrazovaniy is shown at inhibition of burning of a sulphidic dust. The degree of efficiency of the researched additives lowering emission of poisonous gases up to a level of maximum concentration limit is established.

Influence of parity between depth of charge placing and weight of explosive on seismoblast waves parameters in near zone of explosion

Keywords:charge wave, rock mass, the offset

The article consider the correlation of path of least resistance and blasting charge weight influence on the seismic wave’s parameters. The experimental measurements of rock acceleration by blasting charge weight and its depth variation results are adduced. The dependence of rock massif velocity as the path of least resistance and blasting charge weight function is given.