問題一覧
1
a material is said to possess ______ if it is very soft and easily deformed
plasticity
2
The method of separating a mixture of minerals into two or more products on the basis of velocities at which the grains will fall thru a fluid with medium is called
classification
3
These are good examples of bio chemical precipitation of iron minerals in which bacterial actions causes the precipitation of ferric oxide and hydroxides
bag deposit
4
the CaO in CN solution to maintain protective alkalinity is
0.10%
5
avogadros number is the number of atoms in one gram atom which is
6.02x10^23
6
a special type of alloy steel used for tool making is
high speed steel
7
materials which break rather than bend even though great force is required to break them are said to be
brittle
8
The conditioner used to regulate alkalinity of the pulp is
CaO
9
in ore dressing sulfide minerals respond most likely to
flotation
10
lime is addrd in flotation as
ph regulator
11
one pound mole of gas at standard condition occupies
359 cu ft
12
sluice boxes are used kn
solid to solid separation
13
Depressors are substances that
Prevents collectors to anchor on the mineral surface
14
elasticity is the Property a body processes that allows
The body to return to its original shape after being deformed
15
a material that will break suddenly without very much deformation occurrinh before fracture is called
brittle
16
The percentage of the metal in the concentrate against the total metal contained in the ore is called
recovery
17
the material prpperty of toughness can be tested by 1. drop test 2. Charpy test 3. izod test 4. brinell test
2, 3
18
malleability property of material is that property which allows
the material to be rolled to a desired shape without breaking
19
the materials ability to withstand great deformation under hugh loads before rupturing is a measure of its
ductility
20
if f c and t are corresponding metal assays as feed concentrate and tails then the ratio of concentration may be expressed as
(f-c)/(c-t)
21
an example of a material with the mechanical property of brittleness is
cast iron
22
calculated head refers to
grams of metal in product/100 gram per feed
23
the gangue mineral in a lead zinc complex ore id
siderite
24
acid mine drainage refers to
oxidation of sulfide rich minerals
25
Step in assaying wherein dore is formed is called
cupellation
26
cast iron has certain percentage of carbon present
2-4
27
the malleability of most materials will ____ when the mterial is heated
increase
28
a most widely used collectors are
xanthates
29
A middlinh is concentration refers to
Feed the concentration system
30
Hindered settling refers to which of the following
settling of minerals in the thick pulp
31
commercial sink and float processes used as medium
ferrosilicon
32
the mechanical property that determines whether a material will break or stand up under a sudden impact or hard blow is
toughness
33
in ball milling the ball charge centrifuge when the
critical speed is exceeded
34
two common tests used to determine the toughness of a material are the charpy and ____ tests
izod
35
hardness property of material is a bodys ability
resist penetration
36
the law that states that the energy consumed in grinding is proportional to the new surface area created is
rittingers law
37
the term “plasticity” is applied to material which
will not return to its original shape after being deformed
38
a tonnage factor that is equal to 2000/62.5 has a unit of
cu. Ft/it
39
niter is a
Oxidizing agent
40
the ultimate strength of a material determined by a test known as the tensile test
true
41
Voids or pore spaces within a material expressed as a percentage of the total volume of the material is called
poisture
42
The width of the opening at the discharge of a crusher is
set
43
The ratio of the weight of the head to the weight of the concentrate is called
concentration ratio
44
The universal fuel used in metallurgical furnaces is
coke
45
leaching gold is considered
extractive metallurgy
46
the primary grinding the ideal circulating load rato is
250%
47
the property of a material which enables it to be deformed under tension or stretched without rupture
ductility
48
The flotation process of recovering two or more minerals a separate concentrate is called
Differential flotation
49
a tensile test is performed by subjecting the specimen to a
stretchinh type load
50
bodys ability to resist change in shape and size under an applied load is known as
hardness
51
the most important property a metal must posses to be used in construction of a spring is
elasticity
52
the ratio of concentration of 50 to 1 means that
50 tons of ore produced in 1 ton of concentrate
53
what particular sulfide deposits are found in zone three of pod form chromate mineralization
Nickel platinum
54
property of a material which enables it to resist wear abrasion and penetration
hardness
55
iron is produced in a blast furnace from
iron ore
56
coal suited for the production of coke is
bituminous
57
the sp. gr. / density of ore in which the voids and moisture are included
rock sp. gr. -natural
58
pulp density is
ratio of the water to solids by weight
59
in carbon in pulp process of gold recovery granular carbon is called
after the gold is dissolved in the agitators
60
The process of separating the ore minerals from the gangue minerals is
ore dressing
61
ore is composed of
none of the above
62
examples if materials that have the mechanical property of hardness are 1. stellite 2. babbit 3. carbon tool steel 4. diamond
134
63
of all the material listed below the one which the property of brittleness is the highest is
cast iron
64
white metal used for slow speed and heavy load applications is composed of
15 10 75
65
cast iron is produced by melting pig iron together with
scrap iron
66
pod form from my deposits have three zones of mineralization in what particular zone do most metallurgical and refractory type of chromite associates
dunite