Table of Contents
- 1 How do you calculate the amount of material blasting in a quarry?
- 2 How is blasting powder factor calculated?
- 3 What type of explosives are used for mining?
- 4 What explosive is used for rock blasting?
- 5 How do you calculate the powder factor of an explosive?
- 6 What is the difference between high explosives and low explosives?
How do you calculate the amount of material blasting in a quarry?
The total volume of material produced by blasting was calculated by dividing the total amount of material obtained by the unit weight of rock for each blast test (Table 3).
How is blasting powder factor calculated?
Powder factor can be expressed as a quantity of rock broken by a unit weight of explosives. Or, alternatively, it can be the amount of explosives required to break a unit measure of rock. Powder Factor = Tons of rock (or cubic yards) per pounds of explosive.
What type of explosives are used for mining?
Ammonium nitrate fuel oil (ANFO) is made of about 94\% ammonium nitrate and 6\% fuel oil. ANFO is widely used as an explosive in mining, quarrying, and tunneling construction or wherever dry conditions exist.
What muffled blasting?
Muffle blasting is used in opencast mining to prevent fly rock near the populated and roadways area.
How much explosive power does one stick of dynamite have?
A stick of dynamite thus produced contains roughly 1 MJ (megajoule) of energy. Other sizes also exist, rated by either portion (Quarter-Stick or Half-Stick) or by weight. Dynamite is usually rated by “weight strength” (the amount of nitroglycerin it contains), usually from 20\% to 60\%.
What explosive is used for rock blasting?
DYNAMITE – A high explosives used for blasting, consisting essentially of a mixture of, but not limited to, nitroglycerin, nitrocellulose, ammonium nitrate, and carbonaceous materials.
How do you calculate the powder factor of an explosive?
Powder Factor = Tons of rock (or cubic yards) per pounds of explosive. Normal range = 4 to 7 Shallow holes = 1 to 2 External loads = .3 Tons of Rock = Powder Factor lbs of Explosives The higher the powder factor, the lighter the load. Lower powder factor means more explosives. From Powder Factor of 1 lb./c.y.
What is the difference between high explosives and low explosives?
“High explosives” detonate, whereas “low explosives” deflagrate or burn. A high-explosives detonation provides both shock, which fractures (or breaks) the rock, and force (in the form of gas products), which heaves and displaces the fractured rock.
What is the loading density of an explosive?
Loading Density. An explosive’s loading density (LD) is defined as the weight of explosive per unit length of borehole at a specified hole diameter. Expressed in pounds per foot, LD is computed as: LD (lbs/ft) = 0.3405 ρD2. where D is the borehole drilled diameter in inches and ρ is the explosive density in g/cm3.
How do you find the explosive properties of an object?
Explosive Properties. Density. Density is normally expressed in terms of specific gravity or mass divided by volume, as follows: grams/cubic centimeter = g/cm3 = g/cc. (Note that the convention here is typically to use the metric [g/cc] rather than the imperial [g/cm3] measurement system.