Brainscape's Knowledge GenomeTM

Browse over 1 million classes created by top students, professors, publishers, and experts.


See full index

MET126 > Gravity Concentration > Flashcards

Gravity Concentration Flashcards

1
Q

most simple and economical of all concentration methods

A

Gravity Concentration

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
2
Q

mineral particles are separated by virtue of the differences in density

A

Gravity Concentration

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
3
Q

What are the 3 categories under Gravity Concentration?

A

separation in vertical currents, separation in streaming currents, dense- medium separation

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
4
Q

What are the methods under vertical current GC?

A

elutriation, jigs

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
5
Q

What are the methods under separation in streaming currents?

A

panning, sluice boxes, spiral concentrators, reichert cone, shaking table, centrifugal concentrators

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
6
Q

• a process of sizing particles by means of an

upward current of fluid

A

Elutriation

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
7
Q

• uses one or more sorting columns where the
feed is separated into two fractions by their
terminal velocities

A

Elutriation

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
8
Q

• particles < d will move up the column; > d will
report to underflow
• “enhanced decantation”

A

Elutriation

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
9
Q 
• consists of stratification of
particles into layers of different
densities caused by repeated
upward and downward current of
fluid to a very thick suspension of
mixed particles to settle or fall for
short periods of time
A

Jigging

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
10
Q

• normal settling of solids through water
• for shorter travel depths, it is dependent only on densities of
the solids and the

A

Differential Initial Acceleration (DIA)

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
11
Q

• increased pulp density; each mineral particle is covered w/ thin
film of water
• slurry acts as a viscous fluid

A

Hindered Settling

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
12
Q

• at the end of the stroke, when the bed contracts, the ↑d
particles interlock, leaving interstitial spaces
• lower d particles move along the spaces by gravity

A

Consolidation Trickling

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
13
Q

What is an ideal jigging process?

A

Combination of the 3 mechanisms: DIA, Hindered Settling, & Consolidation Trickling

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
14
Q

What are the 5 different types of Jig?

A

Harz jig, Denver mineral jig, Radial jig, (IPJ) In Line Pressure Jig, Baum Jig, Batac Jig

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
15
Q

• used as preliminary concentration of heavy- metal ores
• most commonly used for gold
• heavy minerals regardless of their size settle
to the bottom of the pan, and the lighter
materials remain on top

A

Panning

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
16
Q

• one of the most primitive GC
equipment
• inclined launder, narrowing from
200mm to 25mm

A

Pinched Sluices/ Troughs

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
17
Q

• Feed: 50-65% solids

A

Pinched Sluices/ Troughs

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
18
Q

• separation is a combined effect of
centrifugal action with multi-plane sluicing
in a particularly controlled sink-float
medium

A

Spiral Concentrators

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
19
Q

• Feed: 15-45% solids, 75μm-3mm

A

Spiral Concentrators

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
20
Q

• wash water is added at the inner edge
of stream and flows outwardly, carrying
the low-density minerals to the outer
radius

A

Spiral Concentrators

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
21
Q

• the heavier particles settle, the fines at the
upper layers
• an annular slot at the bottom accomplishes
the separation
• designed for higher capacities; 65-100
Mt/h

A

Reichert Cone

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
22
Q

• Feed: 55-70% solids; 30μm – 3mm

A

Reichert Cone

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
23
Q 
• consists of an inclined deck with parallel
riffles along the long axis
• deck is vibrated longitudinally by a
mechanism w/c allows for a slow forward
stroke and a rapid return
A

Shaking Table

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
24
Q

• generally lowest capacity of all GCs

A

Shaking Table

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
25
Q

• Feed: 2-15 Mt/h; 100μm-1.5mm; 25% solids

A

Shaking Table

26
Q

The stroke of the mechanism and the flowing film of water subjects the
minerals to 2 forces. What are these forces?

A
  • Table motion, longitudinal to the table

- Flowing water film, across the table

27
Q

• may be visualized as rolling the deck of a shaking table into a drum

A

Centrifugal Concentrators

28
Q

• Knelson and Falcon concentrators

A

Centrifugal Concentrators

29
Q

• The drum is rotated so fast that the normal gravitational pull is many
times increased
• The “heavy” minerals report to the concentric rings (riffles), the
“lights” flow with the film of water

A

Centrifugal Concentrators

30
Q

• a compact batch centrifugal concentrator
with an active fluidized bed to capture heavy
minerals
• centrifugal force up to 200 times that of
gravity

A

Knelson Concentrator

31
Q

• a centrifugal concentrator that can treat particles of sizes 10 μm to 6 mm
• generally used for feeds in which the dense
component to be recovered is a very small
fraction of the total material

A

Knelson Concentrator

32
Q

What are the 3 types of Falcon Concentrator?

A

Semi-batch (200-300G), Continuous (300G), Ultrafine (600G)

33
Q

The smooth-walled lower portion is for
particle stratification and then a fluidized upper portion is used for the collection of the heavier particles. The machine is stopped periodically to rinse and collect the valuable concentrate from the bowl.

A

Semi-batch (200-300G)

34
Q

Operates by using a smooth-walled, rotating
bowl to stratify the material into heavier and lighter fractions then uses pneumatic valves to control the amount of heavy material that reports to the concentrate collection stream.
It does not use any fluidization water and
relies entirely on centrifugal force for separation.

A

Continuous (300G)

35
Q

Uses a smooth-walled bowl for particle
stratification with a pneumatically controlled rubber lip for heavy material collection.
The machine is stopped periodically to rinse
and collect the valuable concentrate from the bowl

A

Ultrafine (600G)

36
Q

also known as sink and float or heavy media separation

A

Dense Media Separation

37
Q

2 principal applications:
• widely used to pre-concentrate crushed material prior to grinding (METALS)
• produce a commercially graded end-product (COAL)

A

Dense Media Separation

38
Q
  • most useful for coarsely aggregated ores & ores w/ light gangue
  • problems w/ presence of low-value, high SG minerals
  • cannot be applied for finely disseminated valuable mineral on gangue
    host rock
A

Dense Media Separation

39
Q
  • has the ability to make sharp separations at any required density, with
    a high degree of efficiency, even in the presence of high percentages of
    near-density material
    *Minerals w/ lighter SG than fluid will float,
    while those heavier will sink
A

Dense Media Separation

40
Q

for fractionating low-density materials such as coals

A

Solution of Salts

41
Q

• calcium chloride

A

Solution of Salts

42
Q

• zinc sulfate

A

Solution of Salts

43
Q

• zinc sulfate

A

Solution of Salts

44
Q

for fractionating high and low SG minerals

A

Organic Heavy Liquids

45
Q

• tetrabromoethane w/ white spirit or carbon tetrachloride

A

Organic Heavy Liquids

46
Q

• bromoform with carbon tetrachloride

A

Organic Heavy Liquids

47
Q

• diiodomethane w/ triethyl orthophosphate

A

Organic Heavy Liquids

48
Q

have certain advantages over organic liquids

A

Aqueous Solutions

49
Q

sodium polytungstate

A

Aqueous Solution

50
Q

• Clerici solution (thallium formate – thallium malonate solution)

A

Aqueous Solution

51
Q

utilizes supplementary weighting force produced in a solution
of a paramagnetic salt or ferrofluid when situated in a magnetic field gradient

A

Magnetic Fluids

52
Q

<15% by vol (Newtonian fluids)

A

Suspension of Solids in Water

53
Q

• galena

A

Suspension of Solids in Water

54
Q

• ferrosilicon (82% Fe, 15-16% Si) – for metalliferrous ores

A

Suspension of Solids in Water

55
Q

• magnetite – for coal preparation

A

Suspension of Solids in Water

56
Q

What are the 2 different types of Separating Vessels?

A

Gravitational Vessels, Centrifugal Vessels,

57
Q

What are the 3 sub-types of gravitational vessels?

A

Wemco Cone Separator, Drum Separator, Two- component Drum Separator,

58
Q

What are the 5 sub-types of Centrifugal Vessels?

A

Dense Medium Cyclone, Vorsyl Separator, LARCODEMS, Dyna Whirpool Separator, Tri- flo Separator

59
Q

What are the three elements of DMS circuits?

A

De- sliming stage, Reclaiming Circuit for Media Recovery, Densifiers

60
Q

– to prevent the media from changing its density by presence of fines

A

De- sliming stage

61
Q

– consists of:
• Vibrating drainage screens / washing sprays to recover 90% of media
• Magnetic Separators / Flotation Cells to clean media from fines

A

Reclaiming Circuit for Media Recovery

62
Q

– to maintain density of media

A

Densifiers

MET126 (5 decks)

Brainscape helps you reach your goals faster, through stronger study habits.
© 2024 Bold Learning Solutions. Terms and Conditions