問題一覧
1
In the Merrill Crowe process of gold cyanidation, the residue used to precipitate the gold is
Zn dust
2
The CaO in CN solution to maintain protective alkalinity is
0.10%
3
n the Carbon in Pulp process of gold recovery, granular carbon is called
after the gold is dissolved in the agitators
4
It refers to the amount of valuable metal in the ore
tenore of ore
5
Screens used for Sizing of feed to a primary crusher
grizzly
6
Ore dressing is considered as
Physical process
7
If there is a distinctive difference in surface property, the process indicated for concentration is
flotation
8
The wall rock with the ore in the process of mining is called
waste
9
The process in ore dressing which consist of crushing and grinding is called
communution
10
Free settling means that particle is settling on
water
11
A cyclone is _______ equipment
sizing
12
The minerals that respond most readily to flotation are
sulfides
13
Depressors are substances that
prevents collectors to anchor on the mineral surface
14
Lime is added in flotation as
pH regulator
15
Tonnage of ore depends on
all of the above
16
Saturation (Ms)
mineral sp. gr. and porosity
17
The effect of moisture in the ore is
increase the weight w/o no increase in volume
18
The effect of porosity in the ore
increase the volume w/o any addition in weight
19
Density of solid ore in which both voids and moisture are not included
rock sp. gr. – dried
20
The percentage of the metal in the concentrate against the total metal contained in the ore is called
recovery
21
The ratio of the weight of the head to the weight of the concentrate is called
concentration ratio
22
In ore dressing, assay head is
actual assay of the head
23
In reporting metallurgical testing, we always use the
calculated head
24
A ratio of concentration of 50 to 1 means that
50 tons of ore produced 1 ton of concentrate50 tons of ore produced 1 ton of concentrate
25
Leaching gold is consideredLeaching gold is considered
extractive metallurgy
26
Work index is a measure of
Degree of liberation of the ore
27
The width of the opening at the discharge of a crusher is
Set
28
Most copper primary mines uses
jaw
29
Sluice boxes are used in
Gravity, concentrating process
30
refers to the factor by which the volume of materials is reduced to weight in tons, usually expressed as cu ft per ton
Factor tonnage
31
damage factor that is equal to 2000 over 62.5 has a unit of
cu. Ft/it
32
Weight of a substance relative to that of pure water at a 4°C is
Specific gravity
33
Voids or pores spaces within a material expressed as a percentage of the total volume of the materials is called
Poisture
34
Voids may be
All of the above
35
Ore is composed of
None of the above
36
The specific gravity over density of war in which the voids are considered, but excluding the moisture content is
Rock specific gravity dried
37
The process of electrochemically dissolving copper from impure and selectively, plating the dissolved copper in pure form
Electro refining
38
Quantitative determination in which metal or metals are separated from impurities by fusion processes, and weighed in order to determine the metal content
fire assaying
39
Selective the solution of silver and other base metals from Duray using dilute nitric acid solution, leaving a dull gold flake
parting
40
Added as a source of lead
litharge
41
Weight of lead in grams prevented from being reduced by 1 g of a substance
oxidizing power
42
Powerful, basic flux and by far the cheapest one available it melts at 852°C. It is often charged equal to the weight of the ore sample.
Sodium carbonate
43
Active readily diffusible acid flux it is often used as a cover for crucible fusion
borax
44
A few simple compound of earth or metallic, oxides and silica and other acid constituents
slag
45
Fusion is scared out at _____ temperature
1000 to 1200°C
46
The molten charge is stored in an inverted cone called
cast iron mold
47
Cupellation temperature ranges from
850 to 1000°C yes
48
They reducing power of meter or salt Peter is
4.2
49
What is the maximum temperature for the fusion stage?
1200°
50
Which of the following are undesirables in fire assaying
matte and speiss
51
Which among the following is not a classification of slag material?
pentasilicate slag
52
In the general sampling procedure The first lot should be what size the whole lot
20%