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Charge Preparation for Blating in Mines

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In this post we will discuss about the Charge preparation for underground blasting... For blasting, the charging of hole may consist of one or more cartridge and the separation of cartridge should be least as much possible. Among the charged explosive in a hole, it is necessary that a Detonator is inserted in one of the explosive. The cartridge having Detonator in it, called prime cartridge. To insert Detonator, a hole is maked with a Pricker of brass or wood. Insert the Detonator until it is completely buried in explosive after that put back the flap of cartridge and bind the cartridge around with wire to prevent the detonator to come out during charging. Charging of Shot Holes Proper charging of shot hole is important to get the desire results. We follows two methods to Charge the holes.. 1. Direct Initiation 2. Inverse Initiation Here we will discuss these two methods.. Preparation of Shot Hole Direct Initiation This is the method of Chargi...
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Coal Dust Explosion and Prevention

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In previous post we have discussed about Fire damp Explosion. Now in this post we will discuss a detail about 1. Coal Dust Explosion. & 2. How to prevent it?  You May also like To Read These....       Fire Damp Explosion        Rope Splicing Let's Begin.... Coal Dust Explosion  To explode the coal dust, it has to be suspended in air as a cloud, which is capable to burst and propagate through out the mines. This propagation is due to the presence of coal dust through out the mines. As only 1g/c.c is required for propagation and it is known that no part of mines is free from that.                Before explosion the coal dust should be in the form of cloud in air and the density (30 to 40g/cubic meter) of this so much that no can see through it. To explode coal dust only sufficient density and ignition source is required. As we have discussed in previous post that the Fi...
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Secondary Blasting Technique

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In this post we will deal about the Definition of Secondary Blasting and types of Secondary Blasting . Some other Blasting are also available you can read about that. So let's start... Definition of Secondary Blasting The technique used to blast the boulders to achieve the fragmentation is called secondary blasting. This blasting is done to get the rocks which can be easily handled. Why and how to do secondary blasting? Why secondary blasting? We does secondary, in case when the primary blasting don't give fragmentation of rock which can be easily handled. The secondary blasting is followed after the primary blasting. How to do secondary blasting? To do secondary blasting we have to follow some methods which will give us batter resultant. These are here 1. Plaster shooting or Mud Capping.. As name indicates mud capping, the primer cartridge is place at top of Boulder and covered with mud. The blasting is done from the safe place by electric detonator...
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