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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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Mine Gases-The physiological Effects 1

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1.Carbon Monoxide The Carbon Monoxide is very poisonous gas and it's affinity towards the Haemoglobin is nearly 300times greater than Oxygen.Even if it is present in small quantity reduces the absorption of Oxygen for the blood.It may be named as sweet poison because without the carbon Monoxide Detector no one can identify it's presence. It's increase in percentage can cause.... At following percentage effects can be identified as 0.02-Headache,discomfort and may collapse within 45 to 2 hours. 0.12-Palpitations after 10 minutes of work or 30 minutes at rest. 0.2-Unconsciousness after 10 minutes at work or 30 minutes at rest. 0.5-1.0(Death within 10-15 minutes). *Sources- Spontaneous combustion, Incomplete combustion etc. 2.Carbon Dioxide The sources of Carbon Dioxide are oxidation of Coal, Decay of timber, IC engines etc. The Carbon Dioxide when dissolve in water forms Carbolic acid.It would cause mild irritation because of the presence of water (eyes, Nose ...
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