How to reduce the output of fines rate during block stone extraction by drilling and blasting?
At many quarries for the extraction of building stone there is a problem of increased output of fines after all stages of crushing and grinding, which leads to a decrease in the economic performance of mining enterprises. The fine fraction is formed by the crushing / grinding of prefractured rock mass. Reducing the intensity and size of the prefracture zones will lead to a solution to the problem at hand. It was established that the greatest influence on the shape and duration of the blast pulse is exerted by the velocity of explosive detonation. As the detonation velocity decreases, the peak pressure of the head part of the pulse decreases, and the duration of its rise increases, while a low-amplitude pulse of long duration contributes to better crushing of a rock mass with the least effect of prefracture. Using explosives with a reduced detonation velocity allows reducing the βsurplusβ impact on a rock mass and thus reducing the intensity of prefracture in the zone of controlled crushing during a blast. This is because the individual pieces will be weakened to a lesser extent after a blast and as a result, the yield of undersize when crushing rock into crushed stone will be reduced.
For more information, see the article:
π 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 the journal's Telegram channel:
πt.iss.one/MinSciTechπ
#inenglish #MST #prefracture #crushing #blast #stress #microfracture #fracture #density #detonation #velocity #fines
At many quarries for the extraction of building stone there is a problem of increased output of fines after all stages of crushing and grinding, which leads to a decrease in the economic performance of mining enterprises. The fine fraction is formed by the crushing / grinding of prefractured rock mass. Reducing the intensity and size of the prefracture zones will lead to a solution to the problem at hand. It was established that the greatest influence on the shape and duration of the blast pulse is exerted by the velocity of explosive detonation. As the detonation velocity decreases, the peak pressure of the head part of the pulse decreases, and the duration of its rise increases, while a low-amplitude pulse of long duration contributes to better crushing of a rock mass with the least effect of prefracture. Using explosives with a reduced detonation velocity allows reducing the βsurplusβ impact on a rock mass and thus reducing the intensity of prefracture in the zone of controlled crushing during a blast. This is because the individual pieces will be weakened to a lesser extent after a blast and as a result, the yield of undersize when crushing rock into crushed stone will be reduced.
For more information, see the article:
π 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 the journal's Telegram channel:
πt.iss.one/MinSciTechπ
#inenglish #MST #prefracture #crushing #blast #stress #microfracture #fracture #density #detonation #velocity #fines
mst.misis.ru
Effect of explosive detonation velocity on the degree of rock pre-fracturing during blasting | Khokhlov | Mining Science and Technologyβ¦
π3π΄2β€1π₯1π1π1
Dry technologies for processing and enrichment of mineral raw materials - pros and cons!
The use of dry methods of processing and beneficiation of mineral raw materials is one of the promising areas, as this approach to concentrate production is less energy-consuming, less labor-intensive, and economically beneficial. However, this method of enrichment is not always technologically effective. Experimental studies on the experimental studies on preliminary dry separation of Arkachan deposit ores to determine the quality of beneficiation of the separation products are presented in an article in the journal Mining Science and Technology. The results of the study showed, dry beneficiation as applied to the ores of Arkachan deposit is technologically inefficient. Additional laboratory studies of pneumatic separation processes at high degree of ore materials grinding are required. The authors of the study are confident that their methodological approach will be useful for colleagues in substantiating technologies for processing and beneficiation of mineral raw materials.
For more information, see the article:
π Matveev Π.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
Subscribe to the journal's Telegram channel:
πt.iss.one/MinSciTechπ
#inenglish #MST #beneficiation #ore #gold #grinding #crushing #pneumaticseparation #gravity #concentrator #classification #mill #crusher #recovery #concentrate #tails #size #fractions #separation #content #release #surface #pneumaticseparator #magnetic #dry #goldbearing #cycle #deposit #sample #methodology #test #technology #efficiency #property #particle #material #economy #recycling
The use of dry methods of processing and beneficiation of mineral raw materials is one of the promising areas, as this approach to concentrate production is less energy-consuming, less labor-intensive, and economically beneficial. However, this method of enrichment is not always technologically effective. Experimental studies on the experimental studies on preliminary dry separation of Arkachan deposit ores to determine the quality of beneficiation of the separation products are presented in an article in the journal Mining Science and Technology. The results of the study showed, dry beneficiation as applied to the ores of Arkachan deposit is technologically inefficient. Additional laboratory studies of pneumatic separation processes at high degree of ore materials grinding are required. The authors of the study are confident that their methodological approach will be useful for colleagues in substantiating technologies for processing and beneficiation of mineral raw materials.
For more information, see the article:
π Matveev Π.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
Subscribe to the journal's Telegram channel:
πt.iss.one/MinSciTechπ
#inenglish #MST #beneficiation #ore #gold #grinding #crushing #pneumaticseparation #gravity #concentrator #classification #mill #crusher #recovery #concentrate #tails #size #fractions #separation #content #release #surface #pneumaticseparator #magnetic #dry #goldbearing #cycle #deposit #sample #methodology #test #technology #efficiency #property #particle #material #economy #recycling
π4β‘1β€1π₯1π1
We present the articles of the fourth issue of scientific journal "Mining Science and Technologyβ (Russia) for 2024:
The purpose of this study is to assess dust concentration at the workplace of a crushing and screening plant operator as part of a special labor conditions evaluation. Dust concentration at the operator's workplace was measured using a standard gravimetric method. The testing was conducted in four stages and lasted 400 minutes, which is 83% of the total work shift duration. Data analysis revealed an exceedance of the permissible dust concentration by a factor of 1.28. The labor conditions class (subclass) was established as 3.1. It was found that the average dust concentrations varied by a factor of 3β4 across different testing stages due to the intensity and direction of air velocity at the production site. Based on the obtained data, dust concentrations at the workplace were predicted according to air velocity at the site, with an approximation accuracy of R2 = 0.95. The presented results can be used to predict dust concentrations at the workplaces of operators at other crushing and screening plants, taking into account individual empirical data collected at each site.
For more information, see the article:
π Korol E.A., Degaev E.N., Konyukhov D.S. Assessing dust concentration at the workplace of a crushing and screening plant operator for special labor conditions evaluation. Mining Science and Technology (Russia). 2024;9(4):395-405. https://doi.org/10.17073/2500-0632-2024-03-235
#Inenglish #MST #production #crushed_stone #crushing_plant #dust #concentration #emissions #dustcontrol #dust_generation #operator #workingconditions #occupationalhazards #forecasting #workerprotection #mining #safety
The purpose of this study is to assess dust concentration at the workplace of a crushing and screening plant operator as part of a special labor conditions evaluation. Dust concentration at the operator's workplace was measured using a standard gravimetric method. The testing was conducted in four stages and lasted 400 minutes, which is 83% of the total work shift duration. Data analysis revealed an exceedance of the permissible dust concentration by a factor of 1.28. The labor conditions class (subclass) was established as 3.1. It was found that the average dust concentrations varied by a factor of 3β4 across different testing stages due to the intensity and direction of air velocity at the production site. Based on the obtained data, dust concentrations at the workplace were predicted according to air velocity at the site, with an approximation accuracy of R2 = 0.95. The presented results can be used to predict dust concentrations at the workplaces of operators at other crushing and screening plants, taking into account individual empirical data collected at each site.
For more information, see the article:
π Korol E.A., Degaev E.N., Konyukhov D.S. Assessing dust concentration at the workplace of a crushing and screening plant operator for special labor conditions evaluation. Mining Science and Technology (Russia). 2024;9(4):395-405. https://doi.org/10.17073/2500-0632-2024-03-235
#Inenglish #MST #production #crushed_stone #crushing_plant #dust #concentration #emissions #dustcontrol #dust_generation #operator #workingconditions #occupationalhazards #forecasting #workerprotection #mining #safety
π3β€1π₯1π1π1
π Dry vs wet: unexpected results for Arkachan gold ore
Comparison Methods:
βοΈ Dry Processing: Crushing (DKD-300) + Grinding (TsMVU-800) + Pneumatic Separation (POS-2000)
βοΈ Wet Processing: Gravity Separation with GRG Test (ITOMAK-0.1)
π Key Data:
Gold Distribution:
βοΈ 27.35% in -0.2+0.1 mm class;
βοΈ 11.75% in -0.1+0.071 mm class;
βοΈ 23.46% in -0.071 mm class;
β Total 62.56% in particles <0.2 mm
Method Efficiency:
βοΈ pneumatic Separation: 35.25% recovery at 1.8 t/h;
βοΈ GRG Test: 73.91% recovery with grinding to 80% passing 0.071 mm.
GRG Test Results by Stage:
βοΈ Stage 1 (-1 mm): 40.20% recovery;
βοΈ Stage 2 (-0.315 mm): +14.46%;
βοΈ Stage 3 (-0.071 mm): +20.88%.
Conclusions:
1. Dry methods are ineffective for fine-grained gold (<100 Β΅m).
2. Gravity separation requires fine grinding but achieves high recovery.
3. Major losses are due to incomplete liberation of gold in pyrite.
π Full Article:
Matveev Π.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
π Subscribe: @MinSciTech
π¬ 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:
βοΈ Dry Processing: Crushing (DKD-300) + Grinding (TsMVU-800) + Pneumatic Separation (POS-2000)
βοΈ Wet Processing: Gravity Separation with GRG Test (ITOMAK-0.1)
π Key Data:
Gold Distribution:
βοΈ 27.35% in -0.2+0.1 mm class;
βοΈ 11.75% in -0.1+0.071 mm class;
βοΈ 23.46% in -0.071 mm class;
β Total 62.56% in particles <0.2 mm
Method Efficiency:
βοΈ pneumatic Separation: 35.25% recovery at 1.8 t/h;
βοΈ GRG Test: 73.91% recovery with grinding to 80% passing 0.071 mm.
GRG Test Results by Stage:
βοΈ Stage 1 (-1 mm): 40.20% recovery;
βοΈ Stage 2 (-0.315 mm): +14.46%;
βοΈ Stage 3 (-0.071 mm): +20.88%.
Conclusions:
1. Dry methods are ineffective for fine-grained gold (<100 Β΅m).
2. Gravity separation requires fine grinding but achieves high recovery.
3. Major losses are due to incomplete liberation of gold in pyrite.
π Full Article:
Matveev Π.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
π Subscribe: @MinSciTech
π¬ 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?
π4β€2π₯1π1π―1