Midterm Exam

Question 1

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

Answer 1

b. Pyrometallurgy

Question 2

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

Answer 2

b. Smelting

Question 3

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

Answer 3

b. slags

Question 4

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

Answer 4

d. Collector

Question 5

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

Answer 5

a. Metal Sulfides

Question 6

Fluxes are added to the material being smelted to form

Answer 6

b. Slag

Question 7

Coke is produced from coal by

Answer 7

d. Destructive Distillation

Question 8

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

Answer 8

c. Jaw Crusher

Question 9

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

Answer 9

a. Mole

Question 10

It is the

Answer 10

walang winner tonight

Question 11

The desired product of fusion for fire assaying

Answer 11

d. Lead button

Question 12

Economic mineral of Silica

Answer 12

b. Quartz

Question 13

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

Answer 13

d. Cinnabar

Question 14

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

Answer 14

c. Stoichiometry

Question 15

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

Answer 15

c. Calcination

Question 16

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)

Answer 16

c. Hydrometallurgy

Question 17

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

Answer 17

c. Leaching

Question 18

Choice of leaching methods depends on the following except:

Answer 18

d. None of the choices

Question 19

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

Answer 19

c. Unique Solvent

Question 20

Which of the following is not a solvent in hydrometallurgy?

Answer 20

d. Molten metal

Question 21

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

Answer 21

Liberation

Question 22

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

Answer 22

free particles

Question 23

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

Answer 23

reduction ratio

Question 24

This is the last stage of Comminution

Answer 24

Grinding

Question 25

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

Answer 25

Mill charge

Question 26

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

Answer 26

flotation

Question 27

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

Answer 27

Coagulation

Question 28

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

Answer 28

Flocculation

Question 29

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

Answer 29

Precipitation

Question 30

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

Answer 30

grain

Question 31

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

Answer 31

comminution --> sizing --> concentration --> dewatering --> auxiliary operation

Question 32

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

Answer 32

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

Question 33

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

Answer 33

CaCO3 ---> CaO + CO2 MnCO3 ---> MnO + CO2

Question 34

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

Answer 34

Degree of Liberation

Question 35

Which of the following is a primary crusher

Answer 35

Gyratory Crusher

Question 36

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

Answer 36

Density

Question 37

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

Answer 37

Scavenging

Question 38

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

Answer 38

Sedimentation

Question 39

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

Answer 39

Dewatering

Question 40

Which of the following is not a classification of dewatering

Answer 40

Air Drying

Question 41

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

Answer 41

False

Question 42

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

Answer 42

True

Question 43

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

Answer 43

True

Question 44

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

Answer 44

True

Question 45

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

Answer 45

True

Question 46

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

Answer 46

True

Question 47

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

Answer 47

False - DECREASES

Question 48

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

Answer 48

False - SHORTEST

Question 49

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

Answer 49

True

Question 50

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

Answer 50

Locked particles; middlings

Question 51

These are used as intermediate between crushing and grinding circuits

Answer 51

Ore bins