Quiz 2

Question 1

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.

Answer 1

Assaying

Question 2

Wet Processes

Answer 2

Acid Digestion
AAS
ICP

Question 3

Xray Spectroscopy

Answer 3

XRF
XRD
EDX

Question 4

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.

Answer 4

Fire Assaying

Question 5

metals that are easily reducible

Answer 5

Gold
Silver
Platinum

Question 6

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

Answer 6

Pb
Sn
Cu
Hg

Question 7

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

Answer 7

gaunge

Question 8

having excellent moral qaulities

Answer 8

noble metals

Question 9

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

Answer 9

slag

Question 10

-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

Answer 10

Borax

Question 11

melting point of BORAX

Answer 11

742 degrees C

Question 12

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

Answer 12

Silica

Question 13

Melting point of Silica

Answer 13

1755 degree C

Question 14

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

Answer 14

Litharge

Question 15

Melting point of Litharge (PbO)

Answer 15

883 degrees C

Question 16

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

Answer 16

Soda ash

Question 17

steps in fire assaying

Answer 17

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

Question 18

1 Assay Ton

Answer 18

29.16667g

Question 19

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

Answer 19

charging or fluxing

Question 20

Separation of Pd button from the slag

Answer 20

Fusion

Question 21

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

Answer 21

1000 degrees C in 40-50mins

Question 22

Stages in Fusion

Answer 22

Preheating
Chemical reaction (melting)
Quiet fusion

Question 23

the Pb button is hammered into cubes

Answer 23

Hammering

Question 24

Pb with Au and Ag

Answer 24

Lead button

Question 25

ideal weight of lead button

Answer 25

25-28g

Question 26

slag

Answer 26

silicates or borates of metallic oxide

Question 27

artificial sulfide

Answer 27

matte

Question 28

arsenides and antimonides

Answer 28

speiss

Question 29

-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

Answer 29

Cupellation

Question 30

alloy of silver and gold left in the cupel

Answer 30

Dore

Question 31

Separation of Gold and Silver by dissolution of dilute nitric acid

Answer 31

parting and annealing

Question 32

used to separate gold and silver

Answer 32

nitric acid

Question 33

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

Answer 33

inquartation

Question 34

ratio of silver and gold in inquartation

Answer 34

3:01

Question 35

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

Answer 35

NaCI

Question 36

addition of to separate Ag and CI

Answer 36

soda ash

Question 37

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

Answer 37

bullion

Question 38

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

Answer 38

proof center

Question 39

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

Answer 39

fineness

Question 40

This formula of iron oxide and silica FeO SiO2 is

Answer 40

bisilicate

Question 41

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

Answer 41

gold bullion

Question 42

more than 99% is gold with no silver

Answer 42

fine gold buliion

Question 43

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

Answer 43

dore bullion

Question 44

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

Answer 44

silver bullion

Question 45

Slag in the process fusion becomes very viscous due to

Answer 45

insufficient fusion time

Question 46

highest temp in fusion stage

Answer 46

1200 degree C

Question 47

One purpose of charge calculation is to

Answer 47

control size of bottom

Question 48

The reducing power of flour is

Answer 48

10

Question 49

To prepare a cupel, the principal component is

Answer 49

bone ash

Question 50

The oxidizing power of niter is

Answer 50

4

Question 51

12 karat Gold is

Answer 51

50% Gold