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BEST MEANS TO IMPROVE DRILLING & BLASTING EFFICIENCY AT BAPHLIMALI BAUXITE MINE. UAIL

BEST MEANS TO IMPROVE DRILLING & BLASTING EFFICIENCY AT BAPHLIMALI BAUXITE MINE. UAIL. 1. Drilling & Blasting System at Baphlimali. Atlas Copco IDM 30 – 160 mm diameter Bulk Explosives - SME Non Electric detonator Empty water bottles Monitoring of Ground vibration & Noise. 2.

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BEST MEANS TO IMPROVE DRILLING & BLASTING EFFICIENCY AT BAPHLIMALI BAUXITE MINE. UAIL

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  1. BEST MEANS TO IMPROVE DRILLING & BLASTING EFFICIENCY AT BAPHLIMALI BAUXITE MINE. UAIL 1

  2. Drilling & Blasting System at Baphlimali • Atlas Copco IDM 30 – 160 mm diameter • Bulk Explosives - SME • Non Electric detonator • Empty water bottles • Monitoring of Ground vibration & Noise 2

  3. DRILLING EFFICIENCY AT BAPHLIMALI • Drill face preparation. • Proper Marking as per strata condition. • Drilling is restricted to five rows for good fragmentation, good muck pile generation and reduce back break • SOP & COP. • PPE is followed by all the staff during operation • Wet drilling. • Preventing maintenance of drill machine to avoid major breakdown. 3

  4. BLASTING EFFICIENCY AT BAPHLIMALI • We have started use of Bulk Explosives since 2013(SME). • Down the hole charging is possible in bulk explosive system. • More charging & blasting is possible in bulk explosives case. • We use Nonel to avoid fly rocks, back break also minimise vibration. • During blasting we use blasting shelter only. • Always we do blasting with free face. • We have conducted only two blast/week for better utilisation of manpower and machinery. • We generate targeted blasted material with minimum blasting. • PF improved. 4

  5. SME & IT’S BENEFITS ? • SME is “ Site Mix Emulsion” normally called emulsion explosives. • It is an intimate mixing of AN sol. and Fuel oil with the help of an Emulsifier, Normally named Oil Gel. • The Mixed Product is named as Matrix/ Premix. • It develops its Explosive properties only after adding the Gassing solution to make it booster Sensitive. • Gassing solution is added only while delivering product, hence while transporting it is Non- Explosives. • Manpower for storage & handling purpose is reduced after use of SME and hence more safe. • The explosive is quite safe for use with due precautions. • We can go for big blast as pump truck normally delivered 120kg/minutes. • Down the hole charging is possible in watery hole. 5

  6. CHARACTERISTICS OF EMULSION EXPLOSIVE Velocity of Detonation is (4000-4500m/s). Excellent water resistant. High Detonation pressure (100 -120 K bars/ sq. in). Density can be regulated as per Strata condition.

  7. SAFETY MEASURES IN MMU • High pressure tripping system. • Low Pressure hooter system. • Bursting Disc. • Static Discharge chain. • Hose Diameter (35mm) less than the critical diameter of emulsion explosives. • Screen at Hopper to avoid foreign matter. • Static Hose with wire mesh for static discharge 7

  8. INNOVATIVE IDEA USE OF EMPTY WATER BOTTLES We use empty water bottle during bulk(SME) charging. We save 2 to 3 kg of explosive/hole. Less explosives energy is wasted in pulverising the rock in the crushed zone and a greater fraction of the explosive energy is available for useful work. Fragmentation improved due to reduce of stemming height. Explosives energy distributed throughout the charging column. It is our contribution towards environmental Impact as we have destroyed around 4000 bottles/blast. It reduces Carbon emission due to less quantity of Explosive detonation. 8

  9. SAFE CHARGING PROCESS AT BAPHLIMALI • We parked BMD safely at mine. • All the persons wear PPE and safety clothing during charging. • We barricade properly with red flags during explosive charging to avoid entry of other vehicles/persons. • Always we focus on if any Undercut/ less burden / loose rock is there. • No naked fire or Electric Cable is allowed near vicinity. • We avoid all the radio active instruments near the charging patch. EXPLOSIVES HANDLING :-- • The accessories like DF, Nonel, Cast Booster kept in a safe place. • Priming activity to be done by experienced persons. • Priming and charging process done simultaneously. • With due precaution we do priming and charging so that the initiators do not fall inside the hole or tampered. 9

  10. SAFE CHARGING PROCESS AT BAPHLIMALI • All the holes should be charged as per the schedule and precaution to be taken against over charging. • If water is present in hole, the Nonel / booster should be fastened at least 0.5 above the bottom of hole. • Decking activities should be done in proper supervision to avoid any wrong charging on the top. • Precaution should also be taken to avoid any cut of the Nonel while decking. • Free face side holes should be charged as per the actual burden. • Periodic samples should be taken for Density check. • Maintain Proper Loading sheet for submission. • Precaution should be taken so that the stemming rod does not ram on the accessories. •  Any abnormalities while charging should be brought into notice of shot fire. 10

  11. WINDING UP OF CHARGING AT BAPHLIMALI • The residual Explosives in delivery hose should be flushed properly by air pressure inside the last charged hole . • The Delivery hose should be winded properly in the drum and not dragged for the next face. • The Static Discharge chain should be lifted up and hooked. • Before blasting we check Connection thoroughly. • WE park BMD at safe distance to avoid any damages. 11

  12. PRECAUTIONS DURING MONSOON AT BAPHLIMALI Following Precaution we are taking during monsoon: • Withdraw from the face if thunder storm is predicted. • Try to finish the charging and blasting before the thunder storm is there. • Park the BMD’s in a safe place and not near any iron structures. • Disconnect all the surface connection and move away from the face in case blasting is not done. • We avoid Walky-talky and mobile during thunder storm. 12

  13. WAY FORWARD Blasting with Electronics Detonator: It is programmable detonator and we can assign delay at the mine bench. No need to make inventory for different delay. It is more accuracy(0.005%) as it has no pyrotechnic delay. It is more safe as no detonator available on the surface after the charging. Before and after charging we can easily trace faulty detonator. We can go for big blast up to 15000 no’s shot holes. Charge/delay is reduced with the help of deck charge. Vibration is minimised. Noise is reduced as no trunk line detonator is available on the surface. More safety and security. Through seam blast is possible in coal mines. 13

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