Comminution-grinding (last yr quiz) Flashcards
A crushing operation is achieved by _______ of the ore against rigid surfaces.
compression
The Comminution operation in its earliest stages (of production) is being done in
order to?
HANDLE THE MATERIALS EASILY BY THE ORE CARRIERS SUCH AS
CONVEYOR BELTS. IT IS ALSO BEING DINE IN ORDER TO HAVE MATERIALS
WITH CONTROLLED PARTICLE SIZE.
What is regarded as the first stage of comminution as it removes ores from their
natural beds?
Blasting
What do you call the angle theta?
Angle of Nip
In a dry crushing operation with a slow feeding rate, the crushed products are
immediately removed from the crushing zone to eliminate excess fines by reducing
the number of contacts. This type of crushing is known as?
Free Crushing
In mineral processing, the measurement of the ore’s hardness is reported to as?
Work Index
This is the measurement of the ease with which materials can be comminuted.
Ore Grindability
Who suggested that the relationship between energy and particle size is a
composite form of Kick’s, Rittinger’s and Bond’s Laws?
Hukki
This is a specialized form of a cone crusher for the production of very fine materials
that has found a wide application in the quarrying industry
Gyradisc Crusher
This crusher is utilized for soft, friable and sticky ores that behave plastically when
fed in a slow compression crushing such as coal and phosphates.
Roll Crusher
T or F
In any industrial comminution operation, the breakage of any individual particle is
not occurring simultaneously with that of many other particles.
false (occurring simultaneously)
12.In gyratory crusher, what do you call the moving or gyrating component of the
crusher?
Mantle
t or f
Compressive force applied at a slow rate, the energy applied will be in excess of
that required for fracture that will result in a comparatively large number of particles
with a wide size distribution.
False (energy applied is sufficient to load comparatively few regions of the
particle to the fracture point and only a few particles result)
This law states that energy of breakage is directly proportional to the amount of
new surfaces produced.
Rittinger’s Law
In a blake crusher, the minimum distance between two jaw plates is called the?
Closed Set
In a blake crusher, the distance between the two jaw plates at the feed opening is
termed as?
Gape
The following are the objectives of comminution except:
a. To liberate valuable partcles from gangue.
b. To decrease the surface area to lessen the consumption of reagents.
c. To reduce pieces of ores into smaller ones.
d. To produce solids of desired sizes.
B
A primary crusher in which the inner conical shell is pointing up and outer conical
shell is pointing down.
Gyratory Crusher
This law states that the energy required for producing analogous changes in
configuration in geometrically similar bodies of equal technological state varies as
the volumes or weights of these bodies.
Kick’s Law
In crushing operation, the extent of size reduction is being described through what
measure?
Reduction Ratio
If the jaw crusher has a fixed discharge area and variable receiving area, this is
called?
Dodge Crusher
The process of separating the ore minerals from the gangue minerals is?
Mineral Processing
This law states that the work input is proportional to the new crack tip length
produced in particle breakage.
Bond’s Law
What mechanism of fracture is a result of insufficient energy being applied on the
particle, and localized stress occurs. This produces a small area that is fractured
giving very fine particles
Abrasion
