Managing Muckpile Fragmentation Workshop. Scott G. Giltner
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1 Managing Muckpile Fragmentation Workshop Scott G. Giltner
2 Outline Review of factors affecting fragmentation Burden & Spacing Powder factor Delay time & accuracy Fragmentation modeling
3 Comminution or Breakage 100% 80% Cum % passing 60% 40% 20% Crusher Product ROM In-situ 0% Size mm 10000
4 Fragmentation Parameters Fragmentation Geology Design Explosives Joint Spacing Joint Condition Joint Strike & Dip Bedding Planes Strike & Dip Bedding Plane Condition Bedding Plane Spacing Rock Strength Rock Elasticity Hard/Soft Seams Grain Size Sonic Velocity Burden Spacing Hole Diameter Stemming Subdrilling Delay Timing & Accuracy Bench Ht Staggered/Square Pattern Energy Energy Partitioning Density Velocity of Detonation Coupling
5 Burden & Spacing Free Face Large dia hole Free Face Small dia holes Poor fragmentation zones
6 Geologically Defined Fragmentation
7 Burden & Spacing (Energy Distribution)
8 Powder Factor Average Fragment Size, d50 (mm) Average Fragment Size, d50 d (in) Powder Factor (kg/m 3 ) Powder Factor (lb/yd 3 ) (after Brinkman, 1985)
9 Delay Time % Passing (by mass) in (-25 mm) 1-4 in ( mm) +4 in (+100 mm) 32 ms Fuse Fragment Size
10 Delay Time (mm) X X50 (in) ms/m Burden ms/ft Burden (after Cunningham, 2005)
11 Description of Uniformity n = 0.7 n = 1.0 n = 1.4
12 Delay Scatter 1.3 Scatter Ratio = Scatter / Desired Delay 1.2 Unifo ormity, n Scatter Ratio (after Cunningham,, 2005)
13 Effect of Accurate Timing & Improved Timing
14 Blast Model of Timing Effect 0 ms 10 ms Quarry Academy Timing (10 ms).avi Quarry Academy Timing (0 ms).avi
15 Reduction in Detonation Time L / 2 L L / 2
16 Reduction in Detonation Time Energy Release Energy Rate Power ~30 MJ/kg minutes (hours) (10 3 secs) ~100 kw/kg coal 4-6 MJ/kg microseconds (10-6 secs) ~100,000,000 kw/kg
17 Reduction in Detonation Time 1) Time to complete detonation L = = T VOD L L / 2 2) Time to complete detonation _L/2_ = = T / VOD 2 L / 2 #1 #2 Power = Energy Released / Time
18 Fragmentation Improvements (Powder Factor & Delay Accuracy) Chart for total hours lost/month for combined operations 125 JAN.06 JUL.07 DEC Loader Dig Rate Individual Value UCL=28.2 _ X=14.1 LCL= JAN.06 APR.06 JUL.06 OCT.06 JAN.07 APR.07 Month JUL.07 OCT.07JAN.08 APR.08 Crusher Chunk Delays
19 Fragmentation Models Used to determine trends in fragmentation due to changes in blast design Geologic factors have strong influence, however rarely known with any accuracy Can be calibrated if reliable fragmentation data is available
20 Fragmentation Models Modified Kuz-Ram Includes timing between holes in same row
21 Fragmentation Modeling Inputs Fragmentation Geology Design Explosives Joint Spacing Joint Condition Joint Strike & Dip Bedding Planes Strike & Dip Bedding Plane Condition Bedding Plane Spacing Rock Strength Rock Elasticity Hard/Soft Seams Grain Size Sonic Velocity Burden Spacing Hole Diameter Stemming Subdrilling Delay Timing & Accuracy Bench Ht Staggered/Square Pattern Energy Energy Partitioning Density Velocity of Detonation Coupling
22 Rock Properties (imperial) Rock Type Density (g/cc) Compressive Strength (psi) Tensile Strength (psi) Young's Modulus (psi) Poisson's Ratio P Wave Velocity (ft/s) Basalt ,610 1,595 8,992, ,155 Dolomite 2.5 7, ,061, ,202 Gneiss ,488 2,030 11,748, ,805 Granite ,977 1,305 6,236, ,892 Limestone , ,977, ,404 Marble ,404 2,175 16,374, ,998 Sandstone , ,015,264-12,903 Sandstone 1.8 1, , ,873 Schist ,076 1,305 11,167, ,985 Slate , ,572, ,955 Taconite ,404 2,465 13,488, ,144
23 Fragmentation Scenario #1 Current Blast Parameters Bench ht 100 ft Granite 6 diameter hole ANFO 17 ft x 17 ft pattern 8 ft stemming 5 ft sub-drill Joint spacing of 16 ft (strike perpendicular to face) 25 ms delays between holes in row (2 ms S.D.)
24 Fragmentation Scenario #1 (Current)
25 Fragmentation Scenario #1 Current Blast Parameters Bench ht 100 ft Granite 6 diameter hole ANFO 17 ft x 17 ft pattern 8 ft stemming 5 ft sub-drill Joint spacing of 16 ft (strike perpendicular to face) 25 ms delays between holes in row (2 ms S.D.) Proposed Blast Parameters Bench ht 50 ft 14 ft x 14 ft pattern 7 ft stemming 4 ft sub-drill
26 Fragmentation Scenario #2 Current Blast Parameters Bench ht 50 ft Limestone 4 diameter hole ANFO 11 ft x 13 ft pattern 8 ft stemming 5 ft sub-drill Joint spacing of 12 ft (strike perpendicular to face) 25 ms delays between holes in row (2 ms S.D.)
27 Scenario #2 Fragmentation (Current)
28 Fragmentation Scenario #2 Current Blast Parameters Bench ht 50 ft Limestone 4 diameter hole ANFO 11 ft x 13 ft pattern 6 ft stemming 3 ft sub-drill Joint spacing of 12 ft (strike perpendicular to face) 25 ms delays between holes in row (2 ms S.D.) Proposed Blast Parameters 6 diameter hole 15 ft x 18 ft pattern 8 ft stemming 5 ft sub-drill
29
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