30 Questions
What is the primary interest in studying the breakage behavior of rock in the mineral industry?
To produce a certain, desired fragmentation result
What is the goal for Quarries in terms of rock fragmentation?
To produce aggregates
What is the goal for Mines regarding rock fragmentation?
To extract ores
What is the significance of understanding rock specific fragmentation behavior?
To predict and evaluate the performance of excavation machines
Is the characteristic of a fragmentation result material specific?
Yes
Can the characteristic of rock fragmentation be described?
Yes
What are the operational parameters that control the fragmentation result?
Screen size and passing percentage
What is the range of uniformity indices for broken material in the theoretical distribution?
Between 0.5 and 1.5
What is the first derivation of the particle size distribution curve calculated for each class?
Local slope
What is the specific energy required for crushing Amphibolite in the lab crusher?
[kJ/t]
What type of explosives are used in the small scale blast fragmentation tests?
Nitropenta
What is the size range of samples used in VOD measurements during small scale blast tests?
100 – 300 mm in diameter
What is the specific energy input range observed in the lab scale blast tests?
0.01 - 100 kJ/t
What material shows a specific breakage behavior in the observation of the fragmentation process?
Amphibolite
What is the key finding regarding the characteristics of the fragmentation curves when comparing blast and mechanical fragmentation?
The characteristics in the fines and middle size range do not change significantly.
What type of influence does the type of fragmentation process have on the distribution characteristics in the fines range?
Little influence
What is the local slope observed in the model scale for the fragmentation results?
2.0
What screen size shows a minimum local slope around x = 0.5 mm in the full-scale fragmentation results?
10 mm
What does NBC stand for in the context of particle size distribution?
Natural Breakage Characteristic
How is the particle size distribution converted into a particle surface value?
Measurements (< 100 microns) and calculation
What is the significance of the Local Slope (n) value in the fragmentation curves?
Position of n minimum same for lab & full scale fragmentation curves
What is the purpose of characterizing the fragmentation result based on Specific Surface [cm²/g]?
Characterization of a fragmentation result
What does the Cumulative Net Energy Consumption [J/g] measure in the context of fragmentation?
Fragmentation technical Fragmentation
Which type of material exhibits a Specific Surface of 900 cm²/g in the characterization of fragmentation?
Amphibolite
What is the main purpose of the Rittinger coefficient for various rock types?
Describing the energy required to grind rocks
What does the Energy Register function from comminution & blasting tests describe?
The specific surface versus specific energy input relationship
How is the NBC (Natural Breakage Characteristic) of a rock defined?
By the characteristic of the distribution of the size of particles formed by a fragmentation process
What does the Specific Surface represent in the context of rock fragmentation?
The surface area per unit mass of the rock
How is the Powder Factor related to the specific energy consumption in blasting?
Powder Factor is the ratio of explosive energy to the rock mass, affecting the energy consumption
What is the significance of the Energy Register function for lab and full-scale blast tests?
It helps in understanding the relationship between specific surface and specific energy consumption
Test your knowledge on rock fragmentation, characterization of fragmentation results, observation of rock-specific behaviour, and the Natural Breakage Characteristic (NBC) of a rock.
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