Damps & Mine Dust

Damps & Mine Dusts

1. Damps & Mine Dusts

2. Group member Names CMS ID Muhammad Suleman Khan 25099 Aurangzeb Khan 25129 Wasim Saif 26564 Feroz Ali 24530 Muhammad Parvez 25517 Zubair Ahmad 24940

3. Damps Damps are the names early miners gave to the mixtures of gases. Many of these terms are still in use today. The most common damps are: 1. White Damp 2. Black Damp 3. Stink Damp 4. After Damp 5. Fire Damp

4. White Damp It is a mixture of CO and Air which results from a mine fire. Why called White Damp? Because it is found in high concentrations of black powder smoke which is white. The CO in this mixture makes it toxic.

5. Black Damp It is actually a mixture of CO 2, N 2 and Normal Air. Why called Black Damp? Because it causes miner’s lights to get out. It is produced by methane fires and explosions. This damp causes suffocation.

6. Stink Damp It is a mixture of H 2 S and air. Stink damp gets its name from the characteristics “rotten eggs” order of H 2 S. It is highly toxic.

7. After Damp It is a mixture of CO, CO 2, CH 4 , O 2 , N 2 and H 2. Why called After Damp? Because it is usually found after explosion or fire. Co is the most poisonous of the gases in after damp.

8. Fire Damp It is a mixture of methane and normal air that will burn or explode when ignited. The fir in the fire damp comes from the fact that the mixture is flammable.

9. Mine Dust Dust may be defined as the solid particles of matter t hat are normally produced by crushing, grinding and explosions. Mine dusts are desirable from two points of view: 1) Health hazards 2) Causes of explosion Dust particles which ranges from 10 μ m to 0.0004 inches are classified as respirable dust.

10. Classification of Dusts Dusts are classified on the basis of their harmful physiological effects of explosion properties. The classification is given below:

11. Classification of Dust Cont. 1 Fiberogenic Dust ( harmful to respiratory system) Silica ( Quartz, Chert ) Silicates ( Asbestos, Talc, mica) Metal Fumes Iron ores Tin ores Carborundom Coal ( Anthracite and bituminous )

12. Classification of Dust Cont. 2 Carcenogenic Dust (Radiation) Radon Daughters Asbestos Arsenic 3 Toxic Dusts (poisonous to lungs , tissues) Ores or beryllium, arsenic, lead, uranium, radium, thorium, mercury, silver and nickel.

13. Classification of Dust Cont. 4) Radioactive Dusts Ores of uranium, radium and thorium. 5) Explosive Dusts Metallic dust Coal dust Sulfide ores Organic dust

14. Classification of Dust Cont. 6) Nuisance Dust Gypsum Kaolin limestone