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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.
Assessment of powder factor in surface bench blasting using schmidt rebound number of rock mass 1. IJRET: International Kumar Sonu is student in the Department of Mining Engineering, Indian School of Mines, Dhanbad. He took admission by qualifying IIT Joint Entrance Examination in the year 2011.
Powder factors Typical powder factors used in mass blasts Rules of thumb Rock type PF (kg/m3) Hard Medium Soft Very Soft Typical powder factors used in presplit and smooth blasting Hole diameter PF (kg/m3) Hard Medium Soft
Results of the study, therefore, showed that the company''s quarry has limestone of medium strength range of 30Mpa50Mpa which requires a powder factor
The use of Power Factor in blast design Using the rock type the designer can select the Powder Factor range suitable for the quarry. The face profiles will identify reduced burdens. Table below relates the explosives loading rate and the reduced burden to the expected InHole Powder Factor (for a one metre section of 110mm diameter borehole)
Grit Blasting, Marble Stone amp; Kota Stone Retailer offered by Mining And Blasting from Bhopal, Madhya Pradesh, India
#0183;#32;Powder factor is the ratio between the amount of rock broken and total weight of explosive consumed. It is an important parameter in blast design and has a vital influence on the resultant fragmentation. Higher powder factor causes oversize and lower powder factor results in crushed rock.
Powder factor = 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 = x Spacing Fire as many holes as possible on one delay. Stem holes. Powder factors Typical powder factors
#0183;#32;This, again, will see a powder factor change of 105 percent for the three free faces, and a total possible change in powder factor of more than 158 percent when looking at all situations of ninehole blasting scenarios presented in Tables 4 and 5.
The powder factor is closely related with the efficient blasting [2]. Higher energy explosives, such as those containing large amounts of aluminum powder, higher density can break more rock per
Dimension stone quarry is believed to be type of mining operation that series of work have been done on powder factor that gives economical blasting. At a limestone quarry, blasting costs
Blue Stone Quarry Blasting In IndiaIndia Crusheramp;Mill. blue stone quarry blasting in india; tips for stone quarrying amp; crushing in india. powder factor in blasting lime stone mining india. reduced powder factor by 18%
A baseline for powder factor or a standard number typically is one pound of explosives per cubic yard of rock. This would be a powder factor of one. We use powder factor to measure pounds per yard to achieve specific results from the blast.
Powder Factor = Tons of rock (or cubic yards) per pounds of 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 use of this energy is a major factor in keeping rock blasting costs under control. Highenergy explosives enhance
#0183;#32;Frequency and scale of the blasting events are increasing to boost limestone production. Mines are approaching close to inhabited areas due to growing population and limited availability of land resources which has challenged the management to go for safe blasts with special reference to opencast mining.
The powder factor is closely related with the efficient blasting [2]. Higher energy explosives, such as those containing large amounts of aluminum powder, higher density can break more rock per
National Institute of Technology Rourkela This is to certify that the thesis entitled Optimization of Blasting Parameters in Opencast Mines submitted by Sri Manmit Rout (Roll. No.: ) and Sri Chinmay Kumar Parida (Roll. No.: ), in fulfillment of the requirements for the award of Bachelor of
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