Midterm Exam Flashcards
It includes extraction processes of metal values from the ore or concentrate which are undertaken at high temperatures.
b. Pyrometallurgy
Reduction of Iron Oxide into metallic iron using carbon monoxide from partial combustion of carbon is an example of ______.
b. Smelting
A liquid formed at high temperature which consists of a mixture of metal oxide silicates
b. slags
In smelting, slag acts as a of the impurities present in metal bearing being smelted.
d. Collector
Matte is a high temperature homogenous liquid solution of a mixture of
a. Metal Sulfides
Fluxes are added to the material being smelted to form
b. Slag
Coke is produced from coal by
d. Destructive Distillation
This type of crusher consists of two essentially planar crushing surfaces, one swinging to and from the other stationary surface.
c. Jaw Crusher
Unit of measurement used equivalent to 6.022×10 atom/particle
a. Mole
It is the
walang winner tonight
The desired product of fusion for fire assaying
d. Lead button
Economic mineral of Silica
b. Quartz
Which of the following is an economic mineral source of mercury?
d. Cinnabar
The relationship between quantities of all the elements and compounds coming in and going out of the process.
c. Stoichiometry
It is the process of heating the ore at a temperature not sufficient to melt the ore, in the absence of air
c. Calcination
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)
c. Hydrometallurgy
Process of dissolving valuable minerals or metals from an ore or concentrate feed and extracting the metals of interest into the solution
c. Leaching
Choice of leaching methods depends on the following except:
d. None of the choices
Which of the following is not ideal for a hydrometallurgical solvent?
c. Unique Solvent
Which of the following is not a solvent in hydrometallurgy?
d. Molten metal
______ is the important requirement for the separation of an ore into valuable and waste fractions
Liberation
Crushed particles can consist of a single mineral; called _________.
free particles
For crushing, it is often taken as the ratio of the feed opening (gape) to the discharge opening (set) of equipment
reduction ratio
This is the last stage of Comminution
Grinding
In grinding, this is a mixture of ore, water, and grinding media
Mill charge
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
flotation
_______ is done by altering the stability of the suspended colloidal solids to allow them to adhere to one another
Coagulation
________ is done by formation of more aggregates than coagulation by using reagent molecules acting as “bridges”
Flocculation
This is formation of a solid product as a result of dilution or of the addition of a reagent to the solution
Precipitation
Technically, ____________refers to the individual pieces of a mineral in uncrushed rocks.
grain
Illustrate the general process flow of mineral processing (5 points)
comminution –> sizing –> concentration –> dewatering –> auxiliary operation
Give an example of a reaction representing Roasting process (5 points)
2Cu2S + 3O2 —-> 2Cu2O + 2SO2
CuO + SO3 —-> CuSO4
Give an example of a reaction representing Calcination process (5 points)
CaCO3 —> CaO + CO2
MnCO3 —> MnO + CO2
_________ is the percentage of a mineral or phase occurring as free
particles in relation to the total of the minerals in the ore.
Degree of Liberation
Which of the following is a primary crusher
Gyratory Crusher
In gravity concentration, mineral particles are separated by virtue of
the differences in ____________
Density
Which of the following applications of concentrators, uses strong separating forces to recover as much of the remaining valuable
minerals in tailings.
Scavenging
Rapid settling of solids to produce a decant-able clarified liquid
Sedimentation
This is done to produce a relatively dry concentrate (less shipping
volume)
Dewatering
Which of the following is not a classification of dewatering
Air Drying
T or F: “Mineral Dressing consists of two steps: Liberation and Concentration”
False
T or F : “In transgranular type of liberation due to fracture, fracture occur across the grain”
True
T or F : “The more abundant mineral is easily freed even at particles>grain size”
True
T or F : “In sieving method, sample is placed on topmost, coarsest sieve”
True
T or F : “Gravity Separation is generally accepted as the most simple and economical of all concentration methods”
True
T or F : “the greater the difference in density between two minerals, the more easily they can be separated”
True
T or F : “the efficiency of gravity separation increases sharply in the finer size ranges”
False - DECREASES
T or F : “One of the basic philosophies in ore transport is maximizing longest possible
distances in between processing units”
False - SHORTEST
T or F : “Tailings Dams must be constructed as close to the mine / mill as possible”
True
______________, in liberation terms contains
both valuable and gangue minerals!
Locked particles; middlings
These are used as intermediate between
crushing and grinding circuits
Ore bins
