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Quiz 7 Flashcards

1
Q

An aggregate of minerals from which metal maybe extracted at a
profit is called
a . concentrate c . middling
b . ore d . gangue minerals .

A

b

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2
Q

The formula of Magnetite is
a . Fe203 c . Fe2O3 H2O
b . Fe304

A

b

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3
Q

The formula of enargite is
a . Cu3AsS4 c . Cu2As2S5
b . Cu3AsS3 d . CuAsS2

A

a

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4
Q

A most common gold ore is
a . gold - quartz c . pyritic ores
b . telluride d . Au associated with Cu

A

a

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5
Q

A most common important ore minerals of manganese is
a . pyrolusite c . Rhodochiosite
b . psilomelane d . millerite

A

a

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6
Q

The process of separating the ore minerals from the gangue
minerals is
a . ore dressing c . milling
b . extractive metallurgy d . leaching

A

a

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7
Q

The main object of comminution is
a . liberation of ore minerals from the gangue minerals
b . establish uniform fineness of the lead
c . homogently
d . enhance solubility of ground product

A

a

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8
Q

The law that states that the energy consumed in grinding is
proportional to the new surface area created is
a . Bond’s Law c . Kick Law
b . Hettinger’s Law d . Newton’s Law

A

b

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9
Q

A gyratory crusher is
a . primary c . tertiary
b . secondary d . forth stage crusher

A

a

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10
Q

The part of the crusher that determines the maximum size that will
enter the crusher
a . throat c . gape
b . mouth d . angle of nip

A

C

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11
Q

In ball milling , the ball charge centrifuge when the
a . critical speed is exceeded c . when less water is added
b . critical speed is not reached d . when ball mill is operating , under
load reduce energy

A

a

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12
Q

The purpose of close circuit grinding is
a . lengthen the residence of ore inside the mill
b . prevent ore - grinding
c . reduce oversize in the product
d . reduce energy consumption

A

b

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13
Q

The primary grinding , the ideal circulating load ratio is
a . 150 % c . 250 %
b . 200 % d . 300 %

A

c

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14
Q

In Tyler standard series , the openings are regulated such that the
ratio in any screen to the next screen is
a . 1.414 c . 2.000
b . 1.750 d . 2.150

A

a

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15
Q

The mesh number of a screen
a . no . of opening per linear inch c . opening in inch
b . opening in cm d . opening in mm

A

a

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16
Q

The method of separating a mixture of minerals into two or more
products on the basis of velocities at which the grains will fall thru
a fluid medium is called
a . classification c . heavy media separation
b . sedimentation d . elutriation

A

a

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17
Q

Hindered settling refers to
a . settling of minerals in the thick pulp
b . settling of minerals in water
c . settling of minerals in dilute pulp
d . settling after agitation

A

a

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18
Q

Cyclone is a
a . classifier c . mixing
b . de - watering d . thickening

A

a

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19
Q

A thickener is
a . de - watering equipment c . sizing
b . mixing d . dissolution equipment

A

a

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20
Q

A middling is concentration refers to
a . feed to concentration system c . contains ore and minerals
locked together
b . by product d . discarded portion of the concentration system

A

C

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21
Q

One of this concentration processes is not gravity method
a . panning c.tabbling
b . jigging d . hand - picking

A

d

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22
Q

Commercial sink - and - float processes used as medium
a . magnetite c . galena
b . ferrosilicon d . carbon tetrachloride

A

b

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23
Q

In ore dressing , sulfide minerals respond most readily to
a . flotation c . gravity concentration
b . amalgamation d . hydraulic classification .

A

a

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24
Q

A most common frothier used in flotation is
a . ethyl alcohol c . minerec
b . pine oil d . solid hydrocarbon

A

b

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25
A most widely used collectors are a . xanthates c . thiosulfates b . sodium sulfides d . cresylic acid
a
26
Substances that inhibits flotation of minerals are called a . conditioner c . depress ore b . activators d . modifiers
c
27
The flotation process of recovering two or more minerals as sep- arate concentrate is called a . bulk sulfide flotation c . differential flotation b . selective flotation d . stage flotation
C
28
The conditioner used to regulate alkalinity of the pulp is a . NaCN c . soda ash b . CaO d . Na2S
b
29
The metallurgical recovery refer to a . wt . of concentrate divided by the wt . of feed b . percent of metal contained in the concentrate against metal in the ore c . percent mineral recovered against recoverable minerals d . distribution percentage of metal in feed
b
30
If f , c , and t are corresponding metal assays as feed , concentrate and tails , then the ratio of concentration maybe expressed as a . ( c - t ) / f c . ( ft ) / ( c - t ) - b . ( c t ) / ( ft ) d . ( ft ) ( ct )
C
31
Calculated head refers to a . assay of feed b . grams of metal in product / 100 gram feed c . grams of metal recovered in concentration d . metals in by - product
b
32
Pulp density is the a . weight of a unit volume of pulp b . weight of dry solids in the pulp c . ratio of the water to solids by weight
C
33
Avogadro's number is the number of atoms in one gram atom which is a . 3.4 x 1014 c . 5.0 x 1032 b . 6.02 x 1023 d . 22.4 x 102
b
34
One pound mole of gas at standard condition occupies a . 22.4 cu - ft c . 22.4 liters b . 359 cu - ft d . 22.4 cu - m
b
35
The fundamental heat unit in the English system is a . pound c . Btu b . gram calorie d . kilo - calorie
C
36
The number of calories absorbed when one gram molecular weight of a compound is formed from its elements is called a . heat of reaction c . heat formation b . exothermic reaction d . latent heat of reaction
d
37
Coal suited for the production of coke is a . lignite c . anthracite b . bituminous d . peat
b
38
The universal fuel used in metallurgical furnaces is a . charcoal c . coke b . anthracite d . natural gas
C
39
In the Merrill Crowe process of gold cyanidation , the residue used to precipitate the gold is a . Zn dust c . PbNO3 b . NaS d . granulated carbon
a
40
The CaO in CN solution to maintain protective alkalinity is a . 0.05 % c . 0.10 % b . 0.02 % d . 0.025 %
C
41
In the Carbon in Pulp process of gold recovery , granular carbon is called a . after grinding c . after the gold is dissolved in the agitators b . after thickening d . after cycloning
C
42
A most common practice of reporting hardness of ore is a . Bond's work index c . Hard grove index b . Denver method d . BM method
a
43
Massive pyrite is mined primarily as a source of a . metallic iron b . blended with magnetite to increase grade c . sulfuric for sulfuric acid production d . production of pyrite cinder
d
44
Metallic aluminum is produced by a . smelting pyrometallically A1203 b . electrolysis of fused salts c . leaching with aluminum carbonate
C
45
The gangue mineral in a lead zinc complex ore is a . galena c . siderite b . sphalerite d . Suriferous Au
C
46
In ore dressing seavenging refers to a . recycling of middling b . treatment of rougher tails to mixture recovery c . treatment of cleaner tails
b
47
. It refers to the amount of valuable metal in the ore a . cut - off grade c . tenor of the ore b . average grade d . none of the above
C
48
Screens used for sizing the feed to a primary crusher a . Sieve Bend c . Trammel b . Vibrating screen d . Grizzly
d
49
A jaw rusher is a . primary c . tertiary b . secondary d . fourth stage crusher
a
50
The Cu mineral that has the highest Cu content is a . Chalcopyrite c . Enargite b . Bornite d . Chalcocite
d
51
Ore dressing is considered a . physical process c . metallurgical process b . extractive process d . conventional
b
52
If there is a distinctive difference in surface property , the process indicated for concentration is a . cyanidation c . gravity concentration b . flotation d . hand - picking
b
53
The wall rock with the ore in the process of mining is called a . gangue c . tailings b . waste d . rock minerals
b
54
A most common method of concentrating chromite is by a . jigging c . sluicing b . classifying d . elutriation
a
55
The process in ore dressing which consist of crushing and grind- ing is called a . communution c . agitation b . concentration d . sizing
a
56
Free settling means that particle is settling on a . dilute pulp c . water b . thick pulp d . air
C
57
A cyclone is equipment a . sizing c . de - watering b . mixing d . agglomerating
a
58
The feed to the concentrating system is called a . concentrate c . tails b . head d . middling
b
59
The minerals that respond most readily to flotation are a . oxides c . sulfides b . silicious d . magnetite
C
60
Depressors are substances that a . prevents collectors to anchor on the mineral surface b . enhance attachment to minerals c . reduce air required in the cell d . inhibits collector atom to become attached
a
61
Lime is added in flotation as a . pH regulator c . depressor b . activator d . conditioner
a
62
The percentage of the metal in the concentrate against the total metal contained in the ore is called a . grade of concentrate c . concentration ratio b . recovery d . Distribution
b
63
The ratio of the weight of the head to the weight of the concentrate is called a . concentration ratio c . relative up - grading b . concentration efficiency d . concentration criteria
a
64
In ore dressing , assay head is a . actual assay of the head c . assay of mineral present in the feed b . calculated assay of products d . assay of concentrate less tails
a
65
In reporting metallurgical testing , we always use the a . assay head c . assay of concentrate only b . calculated head d . assay of concentrate less tails
b
66
A ratio of concentration of 50 to 1 means that a . 50 tons of ore produced 1 ton of concentrate b . 50 % of metal is in the concentrate c . one ton of metal is the concentrate for every 50 tons of metal in the ore d . the efficiency of operation is 50 %
a
67
Leaching gold is considered a . ore dressing c . pyrometallurgy b . extractive metallurgy d . liquid - liquid separation
b
68
Work index is a measure of a . hardness of an ore c . weight of a unit volume of the ore b . metal content of the ore d . degree of liberation of the ore
d
69
The width of the opening at the discharge of a crusher is a . gape c . mouth b . set d . stroke or throw
b
70
Most copper primary mines uses a . jaw c . impact b . gyratory d . short head as first stage crusher
a
71
Sluice boxes are used in a . gravity concentrating process c . solid to solid separation b . de - watering process d . sizing process
a
72
. Refers to the factor by which the volume of materials is reduced to weight in tons , usually expressed as cu . Ft . / ton or cu . M / MT . a . porosity c . specific gravity b . factor tonnage d . density
b
73
A tonnage factor that is equal to 2000 / 62.5 ( s . q . ) has a unit of a . cu . Ft / St c . cu . Ft / MT b . cu . Ft / it d . cu . M / MT
b
74
Weight of a substance relative to that of pure water at 4 degree Celsius is a . porosity c . specific gravity b . moisture d . tonnage
C
75
Voids / Pores spaces with in a material expressed as a percentage of the total volume of the material is called a . moisture c . specific gravity b . poisture d . tonnage
b
76
Voids maybe a . free from moisture c . saturated b . partially filled with moisture d . all of the above
d
77
Ore is composed of a . minerals c . moisture b . voids d . none of the above
d
78
The sp . gr./ density of ore in which the voids are considered but excluding the moisture content is a . Mineral sp . gr . c . dried b . rock sp . gr . dried d . rock sp . gr . natural
B
79
The sp . gr./ density of ore in which the voids and moisture are included a . Porosity c . mineral sp . gr . b . rock sp . gr . natural d . rock sp . gr . - dried
b
80
Density of solid ore in which both voids and moisture are not included a . Porosity c . mineral sp . gr . b . rock sp . gr . - natural d . rock sp . gr . - dried
d
81
The effect of porosity in the ore a . decrease the volume w / o any addition in weight b . decrease the volume with increase in weight c . increase the volume w / o any addition in weight d . increase the volume with increase in volume
C
82
The effect of moisture in the ore is a . decrease the weight w / o no increase in volume b . decrease the weight with increase in volume c . increase the weight w / o no increase in volume d . increase the weight with increase in volume
c
83
Saturation ( Ms ) a . mineral sp . gr . and porosity b . rock sp . gr . - dried and moisture c . rock sp . gr . - natural and voids d . none of the above
a
84
Tonnage of ore depends on a . grade at time of examination / valuation b . cost - price relationship of projected mining method ( include cut - off grade ) c . rate of output d . all of the above
d

z Metallurgy (8 decks)

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