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Overview of Explosion Protection Techniques

Basic concept: Ex n consists of several sub types of protection. In most cases being simplified versions of existing types of protection: Basic design is: safety by either limitation of radiation …

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Porgera Mine Explosion

• The plant had been located central to the mine lease for security reasons • No bunding was in place around the plant to deflect an explosion. • No method of remote application of water or fire suppression was in place to quench the fire after the first explosion. • The people evacuated from site were those in administration who were

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An Overview of Drilling and Blasting in Mining

Various methods of blasting have been incorporated in mining, such as: 1. Surface Blasting: Applied in open-pit mining, surface blasting ensures the effective fragmentation of large rock masses. Controlled Blasting: This method minimizes damage to surrounding areas using precise timing and reduced explosive charges. It is often used near ...

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Methods to determine the mine gas explosibility – An overview

In this paper, main popular and typical methods used in mining industry to determine the mine gas explosibility are introduced and reviewed. Case demonstrations for …

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Pillar Extraction

Methods of Mining. There are a number of methods of mining used world-wide. Reference has been made to most of them already, but a brief description might be helpful. In the early days when a shaft had been sunk, coal from the best seam was mined out at the time by bord and pillar methods, returning to the shaft by a process of pillar extraction.

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Risk Assessment of Coal Dust Explosions in Coal Mines Using a …

Despite being crucial for meeting the world's energy demands, coal mining operations present considerable health risks, especially when it comes to exposure to coal dust. Longwall coal mining, an advanced technique, has considerably enhanced production but made dust control more difficult. Due to its explosive nature, coal dust continues to be a serious and …

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The graded warning method of coal spontaneous combustion in Tangjiahui Mine

The gas analysis method a common approach used in coal mines underground. It identifies the initiation and development of coal self-ignition on appearance or concentration change of some gaseous products in coal oxidation [18], [19].Adamus et al. [20] studied the generation process of index gas in coal spontaneous combustion. The study results revealed a …

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Use of Explosion in Soil Improvement Projects

The principle of the explosive replacement method is to remove soft clay and replace it with crushed stones using controlled blasting. The procedure of the method is illustrated in Fig. 18.1.As shown in Fig. 18.1(a), 18.explosive charges are first installed in the soft clay, and then crushed stones are piled up next to it on the side of the road that has been improved.

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Suppression characteristics of methane/coal dust explosions by …

Methane/coal dust explosion suppression experiments were carried out in an 896-m mining tunnel. The suppression mechanism of NH 4 H 2 PO 4 powder during methane/coal …

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Study on the characteristics of compound dust source pollution …

In 2020, coal demand fell sharply due to the global spread of the Corona Virus Disease 2019, with the International Energy Agency (IEA) annual report showing a 4.4% decline in global coal demand (R. Liu et al., 2021a, Liu et al., 2021b).In 2021, world coal consumption rebounded sharply to grow 6% as the economy recovers(S. Li et al., 2020a).The International …

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Sealing Abandoned Areas in Underground Coal Mines …

This publication is intended to provide compliance information to mine operators, miners, and representatives of miners about sealing abandoned areas in underground coal mines. 2. What is the purpose of this guide? This guide contains compliance information to help mine operators meet the requirements of the seals final standard.

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Coal mining with folk arts and poetry

people worked in mining. The demand for more coal also encouraged the production of more efficient machines and methods of mining. The first machines used in mining were steam-powered engines designed to pump water out of mines. As mines became deeper, and more coal was dug out, steam winding engines were used to transport people and

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Occupational Radiation Protection in the Mining and …

This Safety Guide is aimed at regulatory bodies, operators of mines and mineral processing facilities, health and safety committees, workers and their representatives, and health and safety professionals. More Information on …

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Best practice gas control and explosion prevention

Effective explosion prevention involves: • A strong regulatory, inspection and enforcement system – experienced inspectors with the authority to halt the mine if operations are unsafe but also …

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Comparative Analysis of Blast-Load Models in Vapor Cloud …

The structural response of the TNT equivalency method was close to that of the TNO multienergy method with the influence of the blast wave shape in Scenario 1. This work points out the applicable characteristics of each load model, which can provide some suggestions for the blast-load evaluation of vapor cloud explosions in the RC column design.

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NPTEL :: Mining Engineering

Lecture 26 : Selection of Mining Methods - I: Download Verified; 27: Lecture 27 : Selection of Mining Methods - II: Download Verified; 28: Lecture 28 : Selection of Mining Methods - III: Download Verified; 29: Lecture 29 : Selection of Mining Methods - IV: Download Verified; 30: Lecture 30 : Selection of Mining Methods - V: Download Verified ...

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Sampling techniques for mineral deposit | PPT

7. Basis of Sampling For the analytical results obtained to have any validity or meaning it is essential that appropriate sampling procedures be adopted. Thus sampling methods have 3 main groups. Those in which all the material is examined. Causal sampling on ad-hoc basis. Methods in which portions of the material are selected based on upon statistical properties.

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Finite element method simulation of explosive compaction in …

This method is better suited for large deformations; however, in view of computation time, it is expensive. Alternatively, Hirt et al. [20] developed the arbitrary Lagrangian-Eulerian method. In this method, which is a combination of both Lagrangian and Eulerian views, mesh deforms (like Lagrangian), however after each or multiple steps, this ...

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Coal mining methods | PPT

3. Coal Mining is the term that encompasses the physical extraction or removal of coal from the Earth's Surface. When coal is used as fuel in power generation, it is referred to as Steaming or Thermal coal while those which are …

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Prevention and suppression of coal dust explosion in …

Coal dust is a hazardous by-product of the coal mining process. Owing to the adoption of mass production technology, the large amount of coal dust produced in underground coal mines has enhanced the prevalence of coal dust explosions and human health hazards [1].Coal dust explosion is a major threat to the mining industry due to the loss of valuable …

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Experimental and simulation studies on suppressing gas …

Studies have shown that the mechanism and effectiveness of atomized droplets in suppressing gas explosions provide new ideas for mine safety management. According to the …

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How Aggregates Are Extracted | Construction Materials

How a rock quarry works. Rock quarries usually operate for at least 30 years and are developed in distinct benches or steps. A controlled explosion is normally used to release the rock from the working face.

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The Duncan Method of Partial Pillar Extraction at Tasman Mine

method involves stripping the developed square pillars on four-sides on retreat to leave a load-bearing remnant coal pillar. The system of partial extracti on has been successful in delivering safety, productivity and subsidence targets. INTRODUCTION Tasman Mine is an underground bord and pillar mine owned and operated by the Donaldson Coal Pty Ltd

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Dec. 21, 1951: 119 men die in Orient No. 2 Mine explosion

Rescue workers pull a miner worker from the Orient No. 2 coal mine in West Frankfort, Ill., Dec. 22, 1951, following an underground methane explosion.

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A 'gassy' Alabama coal mine sparks a home explosion | WBHM 90.3

"A distant boom," then the ground moved. An Inside Climate News review of state and federal mining records confirms that Griffice's home is located over a proposed expansion of an underground longwall mine—in which bladed machines shear off slices of coal along vast expanses—operated by Crimson Oak Grove Resources, LLC, one of the defendants listed in …

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'Christmas ended that night

Unless all mines are forced to comply with the safety codes of the Federal Bureau of Mines, the mining industry will continue to be a mortician's paradise." Exactly two months later, on Feb. 21, 1952, Lewis testified before …

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Analysis of homemade peroxide-based explosives in water: A review

This additional group was created to separate and include insensitive explosives that are used in mining and demolition fields [2]. The last decade has witnessed a significant increase of terrorism and of the use of PBEs around the world. PBEs is a usual denomination for the most common and simple method of producing explosives: TATP, HMTD and ...

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Surface and Buried Explosions: An Explorative Review with …

An overview of various prediction methods developed over the years based on dimensional analysis and theory of similarity to estimate crater dimensions and magnitude of ground shock and ground motion along with their limitations is presented. Prediction models used to define and optimise rock fragmentation distribution in surface mining ...

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Methods of Explosion Protection in Hazardous Areas

Containment Methods The containment method is used to contain an explosion within the equipment enclosure. Thus, sparks or flames will not leak into the hazardous atmosphere and cause another fire or explosion. Containment is often used with spark-producing parts, such as switch gears, control boards, or transformers.

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12 Mining methods and method selection

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