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Principles of Metallurgy Examinations > Midterm Exam > Flashcards

Midterm Exam Flashcards

1
Q

It includes extraction processes of metal values from the ore or concentrate which are undertaken at high temperatures.

A

b. Pyrometallurgy

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2
Q

Reduction of Iron Oxide into metallic iron using carbon monoxide from partial combustion of carbon is an example of ______.

A

b. Smelting

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3
Q

A liquid formed at high temperature which consists of a mixture of metal oxide silicates

A

b. slags

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4
Q

In smelting, slag acts as a of the impurities present in metal bearing being smelted.

A

d. Collector

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5
Q

Matte is a high temperature homogenous liquid solution of a mixture of

A

a. Metal Sulfides

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6
Q

Fluxes are added to the material being smelted to form

A

b. Slag

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7
Q

Coke is produced from coal by

A

d. Destructive Distillation

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8
Q

This type of crusher consists of two essentially planar crushing surfaces, one swinging to and from the other stationary surface.

A

c. Jaw Crusher

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9
Q

Unit of measurement used equivalent to 6.022×10 atom/particle

A

a. Mole

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10
Q

It is the

A

walang winner tonight

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11
Q

The desired product of fusion for fire assaying

A

d. Lead button

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12
Q

Economic mineral of Silica

A

b. Quartz

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13
Q

Which of the following is an economic mineral source of mercury?

A

d. Cinnabar

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14
Q

The relationship between quantities of all the elements and compounds coming in and going out of the process.

A

c. Stoichiometry

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15
Q

It is the process of heating the ore at a temperature not sufficient to melt the ore, in the absence of air

A

c. Calcination

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16
Q

It is the production of metals from primary and secondary metallurgical sources wherein some of the chemical reactions are carried out in aqueous solutions at ambient temperature (T<300°C) and pressure (P<2.07MPa)

A

c. Hydrometallurgy

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17
Q

Process of dissolving valuable minerals or metals from an ore or concentrate feed and extracting the metals of interest into the solution

A

c. Leaching

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18
Q

Choice of leaching methods depends on the following except:

A

d. None of the choices

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19
Q

Which of the following is not ideal for a hydrometallurgical solvent?

A

c. Unique Solvent

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20
Q

Which of the following is not a solvent in hydrometallurgy?

A

d. Molten metal

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21
Q

______ is the important requirement for the separation of an ore into valuable and waste fractions

A

Liberation

22
Q

Crushed particles can consist of a single mineral; called _________.

A

free particles

23
Q

For crushing, it is often taken as the ratio of the feed opening (gape) to the discharge opening (set) of equipment

A

reduction ratio

24
Q

This is the last stage of Comminution

A

Grinding

25
Q

In grinding, this is a mixture of ore, water, and grinding media

A

Mill charge

26
Q

Generally, separation is made possible by attaching a mineral to a bubble and letting it float above the bulk phase, leaving the other “wanted” mineral submerged

A

flotation

27
Q

_______ is done by altering the stability of the suspended colloidal solids to allow them to adhere to one another

A

Coagulation

28
Q

________ is done by formation of more aggregates than coagulation by using reagent molecules acting as “bridges”

A

Flocculation

29
Q

This is formation of a solid product as a result of dilution or of the addition of a reagent to the solution

A

Precipitation

30
Q

Technically, ____________refers to the individual pieces of a mineral in uncrushed rocks.

A

grain

31
Q

Illustrate the general process flow of mineral processing (5 points)

A

comminution –> sizing –> concentration –> dewatering –> auxiliary operation

32
Q

Give an example of a reaction representing Roasting process (5 points)

A

2Cu2S + 3O2 —-> 2Cu2O + 2SO2
CuO + SO3 —-> CuSO4

33
Q

Give an example of a reaction representing Calcination process (5 points)

A

CaCO3 —> CaO + CO2
MnCO3 —> MnO + CO2

34
Q

_________ is the percentage of a mineral or phase occurring as free
particles in relation to the total of the minerals in the ore.

A

Degree of Liberation

35
Q

Which of the following is a primary crusher

A

Gyratory Crusher

36
Q

In gravity concentration, mineral particles are separated by virtue of
the differences in ____________

A

Density

37
Q

Which of the following applications of concentrators, uses strong separating forces to recover as much of the remaining valuable
minerals in tailings.

A

Scavenging

38
Q

Rapid settling of solids to produce a decant-able clarified liquid

A

Sedimentation

39
Q

This is done to produce a relatively dry concentrate (less shipping
volume)

A

Dewatering

40
Q

Which of the following is not a classification of dewatering

A

Air Drying

41
Q

T or F: “Mineral Dressing consists of two steps: Liberation and Concentration”

A

False

42
Q

T or F : “In transgranular type of liberation due to fracture, fracture occur across the grain”

A

True

43
Q

T or F : “The more abundant mineral is easily freed even at particles>grain size”

A

True

44
Q

T or F : “In sieving method, sample is placed on topmost, coarsest sieve”

A

True

45
Q

T or F : “Gravity Separation is generally accepted as the most simple and economical of all concentration methods”

A

True

46
Q

T or F : “the greater the difference in density between two minerals, the more easily they can be separated”

A

True

47
Q

T or F : “the efficiency of gravity separation increases sharply in the finer size ranges”

A

False - DECREASES

48
Q

T or F : “One of the basic philosophies in ore transport is maximizing longest possible
distances in between processing units”

A

False - SHORTEST

49
Q

T or F : “Tailings Dams must be constructed as close to the mine / mill as possible”

A

True

50
Q

______________, in liberation terms contains
both valuable and gangue minerals!

A

Locked particles; middlings

51
Q

These are used as intermediate between
crushing and grinding circuits

A

Ore bins

Principles of Metallurgy Examinations (2 decks)

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