Powder Factor For Aggregate Mining

Blasting mechanics: Material properties and powder factor ...

Powder factor or specific charge or blasting ratio: This is the ratio between the mass of explosives required to break a given quantity of rock and is normally expressed in kg/m3 or kg/t3. Table 1 is a guide to the powder factor for a given type of explosive in various types of rock.

Bench Blasting Design for Optimum Recovery of Blocks in ...

Apr 15, 2018· * ATTENTION * :- Friends agar aap mining branch se diploma kar rhe hai or aap 3rd ,4th ,5th ,6th sem me hai to hamare pass apke liye subject wise complete PDF available hai. …

BLAST DESIGN

4.1. POWDER FACTOR. The powder Factor is a common tenn used frequently in blasting operations and means simply the number of pounds of explosives necessary to break a certain quantity of rock. For example, if a blaster uses 1,000 pounds to break 1,000 cubic yard of rock, his Powder Factor is …

Optimization of Blasting Parameters in opencast Mines

Powder Factor The following discussion shows a typical type of calculation involved in explosives engineering. Powder Factor is defined as the amount of explosive required to dislodge and fragment 1 cubic yard of rock. [3] The softer (less dense) the material that is being blasted; the smaller the powder factor…

The Powder Factor Dilemma

In surface mining operations, the weight of explosive used per unit volume of rock blasted is measured in pounds per cubic yard) lb/yd 3) (kg/m 3) to produce broken material is defined as powder factor.However, in underground mining operations the preference is to define powder factor as the weight of explosive required per unit of weight of rock to fragment either a metric tonne or an ...

Pit Viper drilling for Africa's iron - Mining ...

The powder factor in NCL, BCCL, SECL, ECL, WCL and West Bokaro Collieries was in range of the optimum powder factor and quality of explosives was measured. The rating index of bulk explosives is varied in between 70 and 100. The powder factor in hard rock was 1.5 to 2.5m3/kg and in soft rock it was in range of 2.0to 3.m3/kg.

How do you calculate powder factor - Answers

Chapter 8 BLAST DESIGN (Figure 8-2) Staggered pattern (Figure 8-3) Sing ... The higher the powder factor, the lighter the load. Lower powder factor means more explosives. Example: ... The economic analysis of the use of explosives is an important part of blasting operations in mining and construction. Explosives are energy, and the efficient ...

Determining minimum burdens for quarry blasting

Get the edge in fragmentation. Powder Factor Solutions is a specialist drill & blast design team based in Western Australia serving our global customers through cloud-based technologies. Utilising cutting edge modelling algorithms; which extend and expand on current industry best-practice; PFS supports your team to deliver optimal rock fragmentation across your entire mining operation.

fragmentation – Mining and Blasting

The use of Powder Factor in blast design The Powder Factor can be used to design the distribution of explosives in the rock mass that is to be blasted. The critical dimension is the burden distance which is the shortest distance to stress relieve when a shot-hole …

Powder Factor - McCallum Rock Drilling

Pit Viper drilling for Africa’s iron. ... Pit Viper and ROC L8 rigs from – is a key element for both the mines themselves as well as mining contractors. Dennis Stonefield, Applications Manager with in Gauteng, points out that there are more than 30 Pit Viper rigs as well as ROC L8 units at work in the region with ...

Chapter 8 BLAST DESIGN - National Park Service

Sep 13, 2010· Powder Factor is the relationship of Explosives to Volume. It describes how much explosives are needed to blast a particular volume of rock. The easy formula is …

H BLASTING IN SURFACE EXCAVATION - Mining and Blasting

optimization of blasting parameters in opencast mines a thesis submitted in partial fulfillment of the requirements for the degree of bachelor of technology in mining engineering by manmit rout & chinmay kumar parida under the guidance of dr. h. b. sahu department of mining …

Study on optimum powder factor and quality of explosives ...

Powder factor = 0.5kg per square metre of face Do not stem holes. Fire all holes on the same delay, or in groups of ≥ 5 holes Smooth Blasting Spacing = 15 x Hole diameter (hard rock) 20 x Hole diameter (soft rock) Burden = 1.25 x Spacing Fire as many holes as possible on one delay.

Blasting and Explosives Quick Reference Guide 2010

Selection of Powder Factor in Large-Diameter Blast Holes by Jack Eloranta 1995 Abstract This paper documents the relationship between material handling and processing costs compared to blasting cost. The old adage, "The cheapest crushing is done in the pit", …

Powder Factor // Detonator Factor // Simple Formula.हिंदी ...

Oct 12, 2012· POWDER FACTOR. In construction blasting, powder factor (PF) is expressed as quantity (unit mass) of explosive per unit volume of material blasted. For mining, it is usually expressed as quantity of explosive per ton of material (or sometimes tons of material per unit mass of explosive). ... SUSTAINABLE AGGREGATE PRODUCTION – ADOPTING IMPROVED ...

Rock fragmentation control in opencast blasting ...

Apr 17, 2019· Today, we still hold the same belief that powder factor is a useful tool for economic analysis but is a poor tool for the design of blasts because powder factor varies based on: rock type, rock structure, type of explosive, blast configuration, hole-to-hole timing, row-to-row timing, bench height and stemming materials.

Impact of Blast Design Parameters on Blasted Muckpile ...

Higher powder factor causes oversize and lower powder factor results in crushed rock. Mean fragment size was plotted against the powder factor for 91 blasts of coal overlying overburden benches, as presented in Fig. 22. The general trend shows that, with increase in powder factor…

A Pattern For Improvement | Agg-Net

Bench Blasting Design for Optimum Recovery of Blocks in Dimension Stone Quarries: A Case Study of Crushed Rock Industry, Supare-Nigeria ... breaking factor is used in place of powder factor …

Selection of Powder Factor in Large-Diameter Blast Holes

Jul 16, 2018· Powder factor is expressed in many different forms. Essentially it is a measurement of explosives per quantity of rock. The typical variation of this that we use on a daily basis is how many pounds of explosives per cubic yard of rock. This gives us a baseline of how we need to go about fragmenting rock for each particular application.

(PDF) Bench Blasting Design for Optimum Recovery of Blocks ...

3.5 Influence of powder factor on muckpile properties. Due to variations made in values of spacing, burden, stemming and bench height, powder factor and geological conditions, values of powder factor moved from 0.79 kg/cum to 1.21 kg/cum. Relation between powder factor and muck properties are as shown in Figure 18, 19, and 20.

Blasting Safety – Revisiting Site Security

PDF | Mining is a geotechnical industry. Geologist explore the economic mineral deposits for mining. ... The Powder Factor is a relationship between how much rock is broken and how m uch explosive ...

Powder Factor - University of Alaska Fairbanks

A NOVEL POWDER FACTOR BASED BENCH BLAST DESIGN METHOD FOR LARGE SURFACE COAL MINES by ANDREW CLIFFORD BLAIR A DISSERTATION Presented to the Graduate Faculty of the MISSOURI UNIVERSITY OF SCIENCE AND TECHNOLOGY In Partial Fulfillment of the Requirements for the Degree DOCTOR OF PHILOSOPHY in MINING ENGINEERING 2015 …

(PDF) ROCK BLASTING FOR MINING

• Delay systems, powder factor, and pounds per delay, • Type and amount of explosive material, and • Type and amount of stemming. The Federal Office of Surface Mining (OSM) regulations [30 CFR § 816.67 and 817.67] help to characterize the bounds of the blast area by specifying that flyrock shall not be cast from the blasting site–

A novel powder factor based bench blast design method …

It is noticed that majority of the damage in the natural blocks are always from poor extraction method. In aggregate quarry, series of work have been done on powder factor that gives economical blasting. In this research work, breaking factor is used in place of powder factor since breaking is required not powder.

Powder Factor Solutions

It is important to note that although the powder factor (0.26) is higher for B4, the dozing hours (5h) and the throw (12.10m) for this blast provide favourable results with no end breaks. This may be attributable to the use of stemming plugs in the last two drilling rows in B4, compared to blast B3 where they were used only in the last row.

Powder Factor For Aggregate Mining :Related Posts

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