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z Metallurgy > Quiz 2 > Flashcards

Quiz 2 Flashcards

1
Q

defined as the quantitative estimation of metals in ores and fur-
nace products. It is also referred as the determination of all con-
stituents, bot metallic and non metallic of ores and metallurgical
prolducts.

A

Assaying

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2
Q

Wet Processes

A

Acid Digestion
AAS
ICP

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3
Q

Xray Spectroscopy

A

XRF
XRD
EDX

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4
Q

Dry method; it is the quantitative determination in which a metal
or metals are separated from other components of the ore by
HEATING and SUITABLE DRY FLUXES and weighed in its PURE
FORM in order to determine the amount of metal present in the
ore.

A

Fire Assaying

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5
Q

metals that are easily reducible

A

Gold
Silver
Platinum

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6
Q

*In some instances, fire assaying may also be used for the deter-
mination of in ore , , ,

A

Pb
Sn
Cu
Hg

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7
Q

earthy portion of the ore that forms the fusible slag which flows
away from the metallic portion on reduction

A

gaunge

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8
Q

having excellent moral qaulities

A

noble metals

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9
Q

fusible compounds resulting from the fusion of fluxes and the
infusible or difficulty fusible bodies;
-contains the gaunge
-wothless matter

A

slag

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10
Q

-active and readily fusible fluxes
-lower the temp of slag formation and considered excellent solvent
for metallic sulfides.
-used as a cover to prevent loss of ore which results from the
escape of gas at a temp below that of incipient fusion
Na2B4O7*10H20

A

Borax

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11
Q

melting point of BORAX

A

742 degrees C

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12
Q

SIO2
-strong acid flux
-combines with metal oxides to form the slag
-protects crucible from corrosion

A

Silica

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13
Q

Melting point of Silica

A

1755 degree C

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14
Q

Pb0
- very strong basic flux
-aids in the fusion of acid substance
-when reduced, it supplies the Lead for the button or furnishes the lead that collects the Au and Ag.
-yellow to orange in color

A

Litharge

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15
Q

Melting point of Litharge (PbO)

A

883 degrees C

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16
Q

Powerful basic flux
-Sodium Carbonate (Na2CO3)
-to the extent reacts with silica and alumina to form silicates and aluminates
-combines with sulfides to create alkaline sulfides and sulphates
-in fision, enhance fluidity

A

Soda ash

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17
Q

steps in fire assaying

A

Sample Preparation
charging or fluxing
fusion
cupellation
parting and annealing
inquartation
weighing

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18
Q

1 Assay Ton

A

29.16667g

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19
Q

mixing the right fluxes to ensure efficient slagging and separation
of precious metal values to the associated substance

A

charging or fluxing

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20
Q

Separation of Pd button from the slag

A

Fusion

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21
Q

crucible with the charge are placed in a muffle furnace in
for

A

1000 degrees C in 40-50mins

22
Q

Stages in Fusion

A

Preheating
Chemical reaction (melting)
Quiet fusion

23
Q

the Pb button is hammered into cubes

A

Hammering

24
Q

Pb with Au and Ag

A

Lead button

25
Q

ideal weight of lead button

A

25-28g

26
Q

slag

A

silicates or borates of metallic oxide

27
Q

artificial sulfide

A

matte

28
Q

arsenides and antimonides

A

speiss

29
Q

-the lead button is pre heated in a cupel in 900 degrees C for
20mins.
-The lead is melted, subsequently oxidized and absorb by the
cupel
-Dore is left in the cupel

A

Cupellation

30
Q

alloy of silver and gold left in the cupel

A

Dore

31
Q

Separation of Gold and Silver by dissolution of dilute nitric acid

A

parting and annealing

32
Q

used to separate gold and silver

A

nitric acid

33
Q

addition of inquartz with known silver content
-when there is more silver left alloy it with more silver

A

inquartation

34
Q

ratio of silver and gold in inquartation

A

3:01

35
Q

addition of to solution to precipitate silver in the form of
AgCl

A

NaCI

36
Q

addition of to separate Ag and CI

A

soda ash

37
Q

alloy of gold and silver with varying amount of one or more base
metal
-An alloy sufficient in precious metals bearing economic signifi-
cance is

A

bullion

38
Q

an artificial sample made up so as to have
nearly as possible the exact composition of the bullion to be
assayed

A

proof center

39
Q

the assay of gold in terms of parts per thousand (ppt)

A

fineness

40
Q

This formula of iron oxide and silica FeO SiO2 is

A

bisilicate

41
Q

more than 50% of precious metals of which more than half is gold and with less than 10% of base metals

A

gold bullion

42
Q

more than 99% is gold with no silver

A

fine gold buliion

43
Q

more than 90% combine gold and silver in which silver isdominant

A

dore bullion

44
Q

more than 50% of precious metals of which more than half is silver
and with less than 10% of base metals

A

silver bullion

45
Q

Slag in the process fusion becomes very viscous due to

A

insufficient fusion time

46
Q

highest temp in fusion stage

A

1200 degree C

47
Q

One purpose of charge calculation is to

A

control size of bottom

48
Q

The reducing power of flour is

A

10

49
Q

To prepare a cupel, the principal component is

A

bone ash

50
Q

The oxidizing power of niter is

A

4

51
Q

12 karat Gold is

A

50% Gold

z Metallurgy (8 decks)

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