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Metallurgy > Quiz 6 > Flashcards

Quiz 6 Flashcards

1
Q

ln sampling of pulp stream, the following statements are correct
except:
a.Material is sampled at the point of free fall discharge
b.Cutter should cut parallel to the stream
c.Cutter covers the whole stream
d.Cutter moves at constant speed

A

b

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2
Q

In the method of tailing disposal, the dam is raised. This has the
advantage of requiring smaller volumes of sand fill to raise crest to
any given height. The dam can be raised more quickly and there
is more trouble keeping it ahead of the tailings pond during the
early stages of construction.
a.Upstream method
b.Centerline method
c.Downstream method
d.Rightstream method
e.Leftstream method

A

b

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3
Q

Sedimentation produces 55-65% up to 80% solids by weight.
Filtration produces 80-90% solids. Thermal drying produces:
a.About 95% solids by weight
b.90-100% solids by weight
c.92-97% solids by weight
d.95-100% by weight
e.exactly 1005 solids by weight

A

a

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4
Q

In fire assaying, this is usually blue-gray in color nearing galena
in composition and is very brittle.
a. Dore
b.Speiss
c.Slag
d.Pb button
e.Matte

A

e

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5
Q

Bone ash cupel is made from the calcitation of animal bones
characterized by the presence of organice matte and carbonates,
nitrates, etc. which can decompose at cupellation temperature
and is undesirable because of the evolution of gases causing:
a.Sprouting
b.Splitting
c.Breakage
d.Spattering
e.Spitting

A

e

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6
Q

The following are reducing agents in fire assaying except:
a.Cream of tartart
b.Flour
c.Charcoal
d.Iron
e.Cryolite

A

e

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7
Q

Given the screen efficiency equation: E=(10,000u)/(UF), where
U=undersize; F=feed; and u=% undersize in feed, is it possible to
have 100% efficiency?
a. True
b.False

A

b

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8
Q

Assume that the capacity of a ball mill varies directly with the
length of the mill and with the 2.9 power of the diameter. If a 4’x4’
ball mill has a capacity of 30 tons per day, calculate the diameter
of a ball mill 5 feet long and that would grind 100 tons per day.
a.6.82ft
b.5.43ft
c.6.70ft
d.5.60ft

A

d

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9
Q

A CIP plant treats 1000 DMTPD of ore with specific gravity of 2.62
and slurry feed density at 1362 kg/m3. Calculate the following:
9.1.Grams gold to be adsorbed on carbon surfaces:
a.12530.21gms
b.11972.81gms
c.11449.97gms
d.11688.51gm
e.11815.22gms
9.2.Head grade in gms/ton if the assay results are as follows:
Residue, g/t Soln, ppm
Feed 3.018 0.306
Tails 0.352 0.035
a.3.370 b.3.521 c.3.324 d.3.156 e.3.485
9.3.Gold recovery:
a.85.01 b.87.65 c.87.91 d.89.89 e.90.70

A

a

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10
Q

A flotation plant treats 800 tons of solid per hour. The feed pulp
containing 45% solids by weight is conditioned for 10 mins with
reagents before being pumped for flotation. Calculate the volume
of conditioning tank required. Density of solids is 2700 kg/m3
a.78.0 m3
b.77.93 m3
c.211.12 m3
d.212.35 m3
e.200.16 m3

A

d

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11
Q

The error of separation defined as the half difference between the
density when 75% is recovered to the tank A and that which 25%
is recovered to float B. Its called ideal separation when its value is
zero. Ep=A-B/2
a. Ecart partition
.Ecart probable
c.Ecci partition
I.Ecci probable
Elton partition

A

b

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12
Q

A CIP plant treats 4200 MT of ore in 24 hrs. It consumes 1.1 kg
NaCN per MT of ore. If the cyanide solution is 15% solution, how
much cyanide solution should be added in CC [per minute?
a.25,465 cc/min
b.8,000 cc/min
c.22,600 cc/min
d.21,389 cc/min
e.24,712 cc/min

A

d

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13
Q

Calculate tons of material going to the tailings and the recovery
if 350.9 of concentrate are produced assaying 53% metal from a
head grade of 4.65% and tailings 0.9%.
a.3541 tons, 70%
b.3743 tons, 79%
c.4589.11 tons, 66.32%
d.4769.21 tons, 82.04%
e.4875.2 tons, 82.04%

A

e

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14
Q

Fusion is one process in fire assaying where the flux with samples
to be analysed for Au are placed in fire assay crucibles and melted
in the furnace. What is the required temperature for the process?
a.800deg C
b.700deg C
c.900deg C
d.1050deg C

A

d

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15
Q

In fusion process in fire assaying, why do we require a certain
temperature of the furnace during the stage assaying samples for
Au determination.
a. Because this is the maximum temperature of the furnace b.Because of the boiling point of the flux
c.Because of the boiling point of CU, Fe, Pb, Zn, Te, and Ag d.Because of the boilih point of Au

A

d

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16
Q

In fire assaying, we have the color scale of temperature in the chamber of the furnace. What is the estimated temperature of the
furnace if it is observed as orange color in the chamber?
a.850deg C
b.800deg C
c.950deg C
d.900deg C

A

d

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17
Q

In preparing beads before adapting acids, they are flattened on an anvil and rolled out to a thickness desired and to prevent it from
crushing when annealing them. What is the desired thickness of
the beads?
a.0.0001 inch
b.0.0015 inch
c.0.001 inch
d.0.01 inch

A

d

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18
Q

It originated from the custom of the assayers of adding silver until
the gold was about a fraction of the whole. What ratio is silver to gold do they consider to be necessary for parting? a.2Ag.2Au
b.3Au.1. Ag
c.3Au.2Ag
d.3Ag. 1Au

A

d

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19
Q

According to their oxidizing or reducing character in the crucible
assay, classify the following ores: Siliceous, oxide and carbonate
ore, ore containing no sulphides, arsenides, antimonides, tel-
lurides
a.Ores having reducing agent
b.Ores having reducing agent c.High sulphide ores
d.Natural ores

A

d

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20
Q

Inscorification, the color of the slags resulting from crucible assays is often indicative of the metal present. What is the metal present if the slags is shaded with green color?
a.Copper
b.Cobalt
c.Zinc
d.Fe

A

d

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21
Q

What is the most serious objection in scorification process with
regards to losses?
a.Slagging
b.pouring
c.Oxidizing
d.Spitting

A

d

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22
Q

What is the solution after reaction of the dore and nitric acid?
a.Acid solution
b.Silver solution
c.Silver Chloride solution
d.Silver nitrate solution

A

d

23
Q

Assayers add litharge to the scorification charge especially solu-
tion with pyritic ores. On heating, the litharge is reduced to what
metal while the sulphur of the pyrite being oxidized.
a.Metallic iron
b.Metallic copper
c.metallic zinc
d.metallic lead

A

d

24
Q

The lead button in scorification process in fire assaying should
weigh from 27 to 32 gms. If it is much smaller than this, there is a danger of a loss of what due to oxidation, especially when the ore is rich in:
a.Gold
b.Copper
c.Iron
d.Silver

A

d

25
Q

Thescorifier slag should be homogenous and glassy. If non-ho-
mogenous, it probably contains what?
a.uncooked reagent b.undissolved litharge
c.unreacted metals
d.undecomposed ore

A

d

26
Q

Ores containing pyrite require what during the roasting period than
those containing galena.
a.more flux
b.more silver in quartz
c.higher concentration of silver solution
d.higher temperature

A

d

27
Q

Gay-lusaac or salt titration is the method used for the accurate
determination of silver in dore bullion. What do assayers term this
method?
a.Refiner’s method
b.Smelter’s method
c.Crucible method
d.Mint method

A

d

28
Q

In bullion assaying, if the copper is not all dissolved particularly with very impure bullion, what will this method may give? a.high results
b.low silver results
c.high gold results
d.high silver results

A

di

29
Q

Bullion assayer always insert check samples on their batch of
gold drilled for Au and Ag determinations. This is to correct the
inevitable losses in cupelling as well as for any other errors on the
process. How do the bullion assayer term this check sample? a.good sample
b.model sample
c.guide sample
d.proofcenter sample

A

d

30
Q

What have large variety of method for assaying of gold and silver
bearing in solutions. What do you call this method, precipitation by lead and zinc acetate?
Lead tray method
o.Zinc dust method
c.William H. Barton method
d.AlfredChiddey method

A

d

31
Q

In fire assaying, if the ore is an oxide and contains copper what
material will the fire assayer add to the charge to prevent the
copper from entering the button?
a.soda ash
b.borax
c.flour
d.sulfur

A

d

32
Q

What mineral will be input to the muffle of the furnace to ensure
reducing conditions during fusion process? a.borax
b.nails c.bone ash
d.coal

A

d

33
Q

The platinum metals themselves are much more difficult to detect,
separate and determine than gold and silver. Platinum was first
discovered in Columbia in the middle of the 18th century where it
was known by the native as:
a. Rhodite
b.Metal of ural mountain
c.Crude platinum
d.Oro Blanco

A

d

34
Q

A fire assayer uses cover to his sample with flux for fusion to
exclude the air and to wash the sides of the crucible and prevent
small particles of lead from adhering thereto. It melts at 819 deg
C. What is the reagent the fire assayer uses as cover?
a.lead oxide
b.bone ash
c.silver nitrate
d.sodium chloride

A

d

35
Q

in the cupellation process of fire assaying, a fire assayer some-
times experience after carrying out this process that the upper
surface of a bead appears to be frosted. What does this indicate?
.the presence of copper
b.the presence of bismuth
c.the presence of antimony
d.the presence of tellurides

A

d

36
Q

In parting process, what does it mean of the black stain occurring
in parting cups after heating the metallic silver to silver nitrate
solution?
a.incomplete parting
b.wrong ratio of parting acid
c.insufficient parting acid
d.insufficient washing

A

d

37
Q

The term reducing power in fire assaying is meant the amount of
lead that 1.0 gram of the ore or substance will reduce when fused
with an excess of litharge. What is the reducing power of the ore if
the assayer weighs 5 grms of ore and charge with 20 gms of flux
and obtain a lead button weighing 16.5 gms?
a.4
b.0.825
c.1.21
d.3.30

A

d

38
Q

An excessive loading of this compound seriously reduces the
adsorption performance of the activated carbon
a.Iron oxide
b.Calcium carbonate
c.Silver chloride
d.Gold chloride

A

b

39
Q

Activated carbon also adsorbs organic materials such as lubricat-
ing oils, diesel fuel, etc. These materials can be removed during
thermal reactivation by:
a. Volatization
Surfacing
c.Cracking
d.Oil migration

A

a

40
Q

.A simple series of sequential leaches developed to elucidate the
deportment of gold in various matrices:
a.pressure leaching
b.in-situ leaching c.bacterial oxidation
d.diagnostic leaching

A

di

41
Q

The superficial velocity of the eluent through the electrowinning
cell to reduce the possibility of detachment of the plated gold from
the cathodes.
a.less than 50 cm/min
b.less than 56 cm/min
c.less than 100 cm/min
d.less than 105 cm/min

A

a

42
Q

A method used for evaluating the efficiency of carbon reactivation
a.equilibrium gold adsorption capacity constant
b.activity test
c.attrition resistance
d.ball pan hardness test

A

b

43
Q

Measures the resistance of solids to mechanical size reduction
a.mining index
b.breaking index
c.rock number
d.hardgrovegrindability index

A

d

44
Q

Recommended packing density for cathodes in pounds of steel
wool per cubic foot for electrowinning.
a.0.5 to 1.0
b.2 to 3
c.1.5 to 2.5
d.2.5 to 3

A

a

45
Q

An elution procedure to remove gold from loaded carbon wherein
the quality of water used is not critical to the process.
a.AARL process
b.Micron gold elution process
c.ZADRA process
d.Duval elution process

A

C

46
Q

What is the ratio of concentration for a treated copper ore
with the following assays:Feed=0.30%Cu, Concentrate=25%Cu,
Tails=0.040%Cu
a.95:1 b.96:1 c.95.4:1 d.97:1

A

b

47
Q

In solution, gold cyanide exists as:
a.Copolymer
b.lsomer
c.Surfactant
d.Linear complex

A

d

48
Q

Gold dissolution by cyanide requires the presence of
a.Oxygen
b.Carbon
c.lime
d.Iron

A

a

49
Q

How many tons of carbon are contained in a CIL tank measuring
24ft diameter X 26ft high. Aspect ratio of tank is equal to 1.0.
The pulp in the tank has a density of 1350 grams per liter. Solids
specific gravity is 2.52. Carbon concentration is 25 gms/liter of
pulp.
a.7.7
b.7.2
c.8.1
d.7.4

A

a

50
Q

Degradation of cyanide at high temperature elution procedures
are due to oxygen and:
a.cyanidation
b.crystallization
c.hydrolysis d.polymerization
e.none of the above

A

C

51
Q

The main differences in the flotation behaviour of mineral particles
of various grain sizes lie in the:
a.hydrofractioning
b.hydrofloating
c.hydrodynamics
c.hydrostatics
d.none

A

C

52
Q

Thechremosorptional fixation of collector reagents on mineral
results to
a.hydrofobisation
b.hydrophobiarization
c.hydrosurfacing
d.hydroplaning
e none

A

a

53
Q

The process which is commonly referred to a merril-crowe precip-
itation after its pioneers:
a.gold cementation on iron
b.zinc plating
c.zinc cementation
d.zinc in pulp
e. none

A

C

54
Q

The preferred process for recovering gold in solutions when gold
assays are above 10ppm.
a.carbon adsorption
b.electroactions
c.electrocoprecipitation
d.merril-crowe

A

d

Metallurgy (8 decks)

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