Metallurgy Flashcards

1
Q

Haemoglobin:Fe then Insulin: _______ & Vit.B-12:____ & Chlorophyll:__.

A

Insulin:Zn
Vit.B-12:Co
Chlorophyll:Mg

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2
Q

Iron ores?

A
Haematite 
Magnetite
Siderite
Chromite
Iron pyrite
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3
Q

Copper ores?

A
Cuprite
Malachite 
Azurite
Copper glance
Copper pyrite
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4
Q

Aluminium ores?

A

Bauxite
Cryolite
Kaolinite/china clay
Corrundum

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5
Q

Lead ores ?

A

Galena
Cerussite
Anglesite

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6
Q

Zinc ores ?

A

Sphaterite/ zinc blende
Calamine
Anglesite

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7
Q

Silver ores ?

A

Argentite/silver glance

Horn silver

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8
Q

Tin ore?

A

Casserite

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9
Q

Whats gangue & flux?

A

Gangue/matrix = impurities of sand,stone particles,silica in mineral.

Flux= substances used to remove impurity(gangue).

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10
Q

Low fusible substance is c/d

A

Slag

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11
Q

Homogeneous mixture of 2 or more metals is c/d

A

Alloy

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12
Q

For metals having low SRP (s-block elements, Al) which type of metallurgy is opted

A

Electro metallurgy.

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13
Q

In pyrometallurgy, metals are extracted by

A

heating.

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14
Q

In hydro metallurgy, metal is extracted by

A

Dissolving in a suitable solvent.

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15
Q

Pulverisation means

A

Crushing/grinding. Large lumps of ore are converted into small pieces using ball mill/crusher.

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16
Q

Gravity separation is used for separation of

A

Oxide ores like Fe2O3, Fe3O4, Cu2O, SnO2

Carbonate ores like FeCO3, ZnCO3

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17
Q

Magnetic separation is used for separation of

A

Magnetic ores like magnetite (Fe3O4), pyrolusite(MnO2), chromite (FeCr2O4).

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18
Q

Froth floatation is used for separation of

A

Sulphide ores except Argentite (Ag2S).

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19
Q

Which method is based on adsorption phenomenon?

A

Froth floatation.

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20
Q

In froth floatation, frother used is

A

Pine oil

Eucalyptus oil

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21
Q

In froth floatation, collector used is

A

Sodium ethyl xanthate.

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22
Q

In froth floatation, froth stabiliser used is

A

Cresol or anniline.

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23
Q

Beyer’s process is for

A

Red bauxite (Fe impurity)

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24
Q

Serpeck’s method is used in extraction of

A

Al from white bauxite (silicon impurity).

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25
Calcination is
Heating ore in absence of O2 below its melting point.
26
Roasting is
Heating of ore in presence of O2 below its melting point.
27
Roasting: sulphide ores :: calcination:
Calcination: hydroxides/carbonates/hydrated ores
28
SnO2, an oxide ore is ______ roasted/calcinated.
Roasted (bcz it contains significant amount of S-impurity).
29
Industries that extract metal from sulphide ores also produce
H2SO4. Bcz raw material i.e SO2 for preparation of sulphuric acid is produced by roasting of sulphide ores.
30
Give molecular formula of haematite
Fe2O3
31
Give molecular formula of magnetite
Fe3O4
32
Give molecular formula of siderite
FeCO3
33
Give molecular formula of chromite
FeCr2O4
34
Iron pyrite is a sulphide ore with formula
FeS2
35
Formula of malachite & azurite
``` Malachite = CuCO3.Cu(OH)2 Azurite = 2CuCO3.Cu(OH)2 ```
36
Copper pyrite is
CuFeS2
37
Cuprite is
Cu2O
38
Bauxite
Al2O3.H2O
39
Formula of cryolite
Na3AlF6
40
Kaolinite an ore of Aluminium has formula
Al2O3.SiO2.2H2O
41
Galena, cerussite, anglesite have formula
``` Galena = PbS Cerussite = PbCO3 Anglesite = PbSO4 ```
42
Formula of zinc blende, calamine, zincite is
Zinc blende = ZnS Calamine = ZnCO3 Zincite = ZnO
43
Argentite/ silver glance =
Ag2S Horn silver = AgCl
44
Cassiterite is
Tin ore with formula SnO2
45
Hydro metallurgy is adopted for reduction of ores of ____?
Ag Au *jisme na wo cmpd bante hain [Au(CN)2]^- phr [Zn(CN)4]^-2 [Ag(CN)2]^- phr [Zn(CN)4]^-2
46
Which are oxidising & reducing agents respectively in hydro-metallurgy of Au/Ag?
O2 is oxidising agent. | Zn is reducing agent.
47
Auto-reduction is for
Sulphide ores. As for Cu2S, PbS, HgS. Here ore irself acts as reducing agent for its oxide.
48
Smelting (reduction of ore using coke) is done for
ZnO PbO Fe2O3 by C at high temp. & by CO at low temp. (1079K)
49
Reducing agent in thermite process is
Al Mn3O4 / Cr2O3 —-> .. in presence of Al
50
Mg is reducing agent in Kroll’s process.
True. TiCl4 —> Ti + MgCl2 in presence of Mg.
51
NiO & WO3 are reduced by
H2
52
Flourspar is
CaF2
53
Copper matte ?
Cu2S + FeS
54
Van arkel process is for purification of
Ti, Zr, Hf
55
Mond’s process id for the purification of
Ni.
56
Zone refining is for
Si | Ga, Ge, As
57
Distillation is done for
Zn Cd Hg
58
Liquation is for purification of
Sn | Pb, Bi
59
Thomas slag is
Ca3(PO4)2 Or Ca3(PO4) + CaSiO3
60
For purification of Cu, Ag, Au we use
Electro-refining
61
Vapour phase refining?
Based on the principle that gaseous product formed in first step must be unstable. 2 methods: Van arkel process (for Ti, Zr, Hf . Also for W,V.) Mond’s process (for Ni.)
62
Poling is a method of _______ and used for ____ ores.
Purification. | Used for Cu & Sn. Ore that has oxide impurity.