๐ฅ How does the detonation velocity of explosives affect rock fracturing?
In quarries for building stone extraction, up to 30% of the rock turns into fines after blasting and crushing, reducing economic efficiency. One of the key factors is the prefracture zones formed during explosive detonation.
๐ฌ What was studied?
1๏ธโฃ Explosive detonation velocity (ranging from 2 to 5.2 km/s).
2๏ธโฃ Stresses in the rock mass during blasting.
3๏ธโฃ Microfracturing using X-ray microtomography.
๐ Results:
โ๏ธ The size of the prefracture zone increases from 33R to 77R (where R is the charge radius) as detonation velocity rises.
โ๏ธ Microfracture density (N) depends on the distance from the charge:
โข Near zone (10R): from 5,000 to 13,800 pcs/cmยณ (exponential growth).
โข Far zone (70R): from 0 to 200 pcs/cmยณ (linear growth).
๐ก Practical conclusions:
โก๏ธ Using explosives with reduced detonation velocity minimizes prefracture zones and decreases fines yield.
โก๏ธ Optimizing blasting parameters allows controlled rock fragmentation and increases the output of marketable fractions.
For more information, see the article:
๐ Khokhlov S.V., Vinogradov Yu.I., Makkoev V.A., Abiyev Z.A. Effect of explosive detonation velocity on the degree of rock pre-fracturing during blasting. Mining Science and Technology (Russia). 2024;9(2):85-96. https://doi.org/10.17073/2500-0632-2023-11-177
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๐ t.iss.one/MinSciTech ๐
#InEnglish #MST #Prefracture #CrushingToRubble #BlastStresses #Microfracture #FractureDensity #DetonationVelocity #FinesYields #Rock #Blast #Explosives #Quarry #Stone #Fines #Stress #Wave #Charge #Radius #Density #Cracks #Fragmentation #Impact #Velocity #Energy #Zones #Array #Control #Efficiency #Laboratory #Tomography #Results #Optimization #Parameters #Marketable #Output
In quarries for building stone extraction, up to 30% of the rock turns into fines after blasting and crushing, reducing economic efficiency. One of the key factors is the prefracture zones formed during explosive detonation.
๐ฌ What was studied?
1๏ธโฃ Explosive detonation velocity (ranging from 2 to 5.2 km/s).
2๏ธโฃ Stresses in the rock mass during blasting.
3๏ธโฃ Microfracturing using X-ray microtomography.
๐ Results:
โ๏ธ The size of the prefracture zone increases from 33R to 77R (where R is the charge radius) as detonation velocity rises.
โ๏ธ Microfracture density (N) depends on the distance from the charge:
โข Near zone (10R): from 5,000 to 13,800 pcs/cmยณ (exponential growth).
โข Far zone (70R): from 0 to 200 pcs/cmยณ (linear growth).
๐ก Practical conclusions:
โก๏ธ Using explosives with reduced detonation velocity minimizes prefracture zones and decreases fines yield.
โก๏ธ Optimizing blasting parameters allows controlled rock fragmentation and increases the output of marketable fractions.
For more information, see the article:
๐ Khokhlov S.V., Vinogradov Yu.I., Makkoev V.A., Abiyev Z.A. Effect of explosive detonation velocity on the degree of rock pre-fracturing during blasting. Mining Science and Technology (Russia). 2024;9(2):85-96. https://doi.org/10.17073/2500-0632-2023-11-177
Subscribe to our Telegram channel:
๐ t.iss.one/MinSciTech ๐
#InEnglish #MST #Prefracture #CrushingToRubble #BlastStresses #Microfracture #FractureDensity #DetonationVelocity #FinesYields #Rock #Blast #Explosives #Quarry #Stone #Fines #Stress #Wave #Charge #Radius #Density #Cracks #Fragmentation #Impact #Velocity #Energy #Zones #Array #Control #Efficiency #Laboratory #Tomography #Results #Optimization #Parameters #Marketable #Output
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๐ Dry vs wet: unexpected results for Arkachan gold ore
Comparison Methods:
โ๏ธ Dry Processing: Crushing (DKD-300) + Grinding (TsMVU-800) + Pneumatic Separation (POS-2000)
โ๏ธ Wet Processing: Gravity Separation with GRG Test (ITOMAK-0.1)
๐ Key Data:
Gold Distribution:
โ๏ธ 27.35% in -0.2+0.1 mm class;
โ๏ธ 11.75% in -0.1+0.071 mm class;
โ๏ธ 23.46% in -0.071 mm class;
โ Total 62.56% in particles <0.2 mm
Method Efficiency:
โ๏ธ pneumatic Separation: 35.25% recovery at 1.8 t/h;
โ๏ธ GRG Test: 73.91% recovery with grinding to 80% passing 0.071 mm.
GRG Test Results by Stage:
โ๏ธ Stage 1 (-1 mm): 40.20% recovery;
โ๏ธ Stage 2 (-0.315 mm): +14.46%;
โ๏ธ Stage 3 (-0.071 mm): +20.88%.
Conclusions:
1. Dry methods are ineffective for fine-grained gold (<100 ยตm).
2. Gravity separation requires fine grinding but achieves high recovery.
3. Major losses are due to incomplete liberation of gold in pyrite.
๐ Full Article:
Matveev ะ.I., Lebedev I.F., Vinokurov V.R., Lvov E.S. Comparative processing studies of the Arkachan deposit gold-bearing ores using dry separation and classical wet gravity separation methods. Mining Science and Technology (Russia). 2024;9(2):158-169. https://doi.org/10.17073/2500-0632-2023-10-168
๐ Subscribe: @MinSciTech
๐ฌ What modern methods could improve dry processing for such ores?
#InEnglish #MST #Mining #Gold #Beneficiation #Crusher #Mill #Separator #DryProcessing #ParticleSize #Pyrite #Sample #Ore #Test #Method #Analysis #Stage #Class #Gravity #FineGrained #Particles #Concentrate #Grinding #Efficiency #Crushing #Recovery #Flowchart #Cycle #Fraction #Balance #Parameter #Mode #Degree #Impact #Abrasion #Subsample #Sludge #Pulp #SizeFraction #Feed #Tailings #Losses #Product #Intergrowths
P.S. For ores with fine-grained gold, classical gravity remains optimal. Are there alternatives?
Comparison Methods:
โ๏ธ Dry Processing: Crushing (DKD-300) + Grinding (TsMVU-800) + Pneumatic Separation (POS-2000)
โ๏ธ Wet Processing: Gravity Separation with GRG Test (ITOMAK-0.1)
๐ Key Data:
Gold Distribution:
โ๏ธ 27.35% in -0.2+0.1 mm class;
โ๏ธ 11.75% in -0.1+0.071 mm class;
โ๏ธ 23.46% in -0.071 mm class;
โ Total 62.56% in particles <0.2 mm
Method Efficiency:
โ๏ธ pneumatic Separation: 35.25% recovery at 1.8 t/h;
โ๏ธ GRG Test: 73.91% recovery with grinding to 80% passing 0.071 mm.
GRG Test Results by Stage:
โ๏ธ Stage 1 (-1 mm): 40.20% recovery;
โ๏ธ Stage 2 (-0.315 mm): +14.46%;
โ๏ธ Stage 3 (-0.071 mm): +20.88%.
Conclusions:
1. Dry methods are ineffective for fine-grained gold (<100 ยตm).
2. Gravity separation requires fine grinding but achieves high recovery.
3. Major losses are due to incomplete liberation of gold in pyrite.
๐ Full Article:
Matveev ะ.I., Lebedev I.F., Vinokurov V.R., Lvov E.S. Comparative processing studies of the Arkachan deposit gold-bearing ores using dry separation and classical wet gravity separation methods. Mining Science and Technology (Russia). 2024;9(2):158-169. https://doi.org/10.17073/2500-0632-2023-10-168
๐ Subscribe: @MinSciTech
๐ฌ What modern methods could improve dry processing for such ores?
#InEnglish #MST #Mining #Gold #Beneficiation #Crusher #Mill #Separator #DryProcessing #ParticleSize #Pyrite #Sample #Ore #Test #Method #Analysis #Stage #Class #Gravity #FineGrained #Particles #Concentrate #Grinding #Efficiency #Crushing #Recovery #Flowchart #Cycle #Fraction #Balance #Parameter #Mode #Degree #Impact #Abrasion #Subsample #Sludge #Pulp #SizeFraction #Feed #Tailings #Losses #Product #Intergrowths
P.S. For ores with fine-grained gold, classical gravity remains optimal. Are there alternatives?
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