Shock blasting of ore stockpiles by low-density explosive charges

Begalinov, Abdrakhman; Serdaliev, E. T.; Iskakov, Yerkin; Amanzholov, D. B.

doi:10.1134/s1062739149060129

Cited by 7 publications

(2 citation statements)

References 0 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…In such a way, ore extraction in narrow stopes is subject to the difficulties connected with the conflicting requirements as to its results. On the one hand, breakage procedure as well as the defined parameters of drilling-and-blasting operations (DBOs) should provide high efficiency [22]- [26]. Nevertheless, on the other hand it is required to comply with the geometry of mining operations; minimize amount of rocks being separated; and provide uniform defragmentation of the extracted ore with minimum formation of fine and coarse fractions [27], [28].…”

Section: Introductionmentioning

confidence: 99%

Selection of the optimal composition and analysis of the detonating characteristics of low-density mixed explosives applied to break thin ore bodies

Serdaliyev,

Iskakov,

Amanzholov

2023

Min. miner. depos.

View full text Add to dashboard Cite

Purpose is to select the optimal composition of the mixed low-density explosive (Es) applied in the form of blasthole charges which provide high efficiency of blasting operations while mining of thin ore deposits. The abovementioned becomes possible while studying features of the foamed polystyrene chemical decomposition and gasification; role of additional water components as well as catalyzator being sodium carboxymethyl cellulose; and analysis of explosive characteristics of the compositions. Methods. The research involved lab-based experiments to define application efficiency of the recommended low-density blasting agents through identification of the basic explosive characteristics of the model mixed Es. Findings. The optimal composition of the mixed low-density Es has been developed. It consists of ammonia nitrate, diesel fuel, granulated foamed polystyrene, water, and sodium carboxymethyl cellulose to be used to break thin ore bodies. Owing to it, the possibility has arisen to control over a wide range both detonation velocity and pressure of blasting fumes during the charge density increasing or decreasing. The main detonative characteristics of the proposed compositions of low-density Es have been determined helping perform explosive rock mass loading in terms of extremely low values of both energy and explosive characteristics. The developed composition of the mixed low-density Es makes it possible to control quantity of Es energy in a volume well unit by means of increase or decrease in the charge energy concentration depending upon the changes in the rock mass resistance; in such a way, efficient breakage of thin ore bodies is provided inclusive of less dilution indicators. Originality. For the first time, dependence of the relative efficiency of the mixed low-density Es upon the foamed polystyrene volume content has been identified as well as dependence of pressure of blasting fumes upon the charging density. Practical implications are the development of procedures for blasting operations while thin ore body mining. The procedures are based upon formulating of the optimal composition of low-density Es differing in its simplicity, safety, and efficiency; and helping reduce prime cost of the extracted mineral at the expense of the decreased degree of the ore dilution. An empiric formula to define specific consumption of the low-density Es has been proposed for Akbakay mine.

show abstract

Section: Introductionmentioning

confidence: 99%

Selection of the optimal composition and analysis of the detonating characteristics of low-density mixed explosives applied to break thin ore bodies

Serdaliyev,

Iskakov,

Amanzholov

2023

Min. miner. depos.

View full text Add to dashboard Cite

show abstract

“…The purpose of this management is to ensure safe mining and reduce the volumes of overburden while maintaining the stability of the slopes in the benches. Managing the state of natural and technogenic masses during open-cut mining of mineral deposits is in a set of measures to maintain and bring the benches, sides and dumps of the open pit into a stable state, close to the limiting one, by changing the geometric parameters of the slopes during the mining process, which provides economic and safe mining oper ations [8].…”

Section: Introductionmentioning

confidence: 99%

Assessing the quality of drilling-and-blasting operations at the open pit limiting contour

Khussan¹,

Lozynska²,

Takhanov³

et al. 2021

Nauk. visn. nat. hirn. univ.

View full text Add to dashboard Cite

Purpose. To develop a methodology for assessing the quality of drilling-and-blasting operations when setting the side to the final position. In this regard, it is necessary to study the nature of deformations in the near-side masses of the design open-pit contours and to assess the seismic impact of blast waves in accordance with damage in the near and far zones from the open-pit boundary, as well as the level of generated seismic vibrations. Methodology.A methodology for assessing the quality of drilling-and-blasting operations at the limiting contour of open pits is developed using the analysis of the mining-and-geological conditions of the rocks constituting the field, in-situ surveying of the state of the open-pit sides, analysis of the physical-mechanical properties of the host rocks, analytical studies and instrumental measurements of the blasting effect. Findings.Based on the analytical methods, the calculation and analysis of the seismicity coefficient of the rocks at the field have been performed. By means of instrumental measurement of the blasting effect in open pit, data have been obtained on the seismic impact of blasting operations on the near-side mass. Based on the results of these works, a methodology for assessing drilling-and-blasting operations at the limiting contour of the open pit has been developed. Originality.In this work, to assess the blasting effect, the seismicity coefficient of the rock mass is used, which characterizes the degree of elastic response to external dynamic influence and is a parameter that determines the elastic seismic wave intensity with distance from the site of blasting operations. Based on the calculation, a map of the seismicity coefficient distribution in the open-pit area has been compiled. Using the method of instrumental measurements, which serves to determine the seismic impact of blasting on a rock mass, the degree of blasting effect on a near-side mass has been revealed. This made it possible to develop a method for assessing the blasting quality, based on determining the percentage of permissible deviations in the face drilling quality. Practical value.The results of the work will be used to calculate the safe parameters of conducting the blasting operations when setting the side to the final position. This method for assessing the quality of drilling-and-blasting operations can be applied at any mining enterprise conducting open-cut mining of minerals.

show abstract

Study on damage characteristics of iron ore under variable line density charge structure blasting

Ma,

Hu,

et al. 2024

Rock Mechanics Bulletin

View full text Add to dashboard Cite

Shock blasting of ore stockpiles by low-density explosive charges

Cited by 7 publications

References 0 publications

Selection of the optimal composition and analysis of the detonating characteristics of low-density mixed explosives applied to break thin ore bodies

Selection of the optimal composition and analysis of the detonating characteristics of low-density mixed explosives applied to break thin ore bodies

Assessing the quality of drilling-and-blasting operations at the open pit limiting contour

Study on damage characteristics of iron ore under variable line density charge structure blasting

Contact Info

Product

Resources

About