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Chemistry > Metallurgy > Flashcards

Metallurgy Flashcards

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1
Q

Seven metals of antiquity

A 
Gold
Cu
Ag
tin 
Pb 
Fe 
Hg
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2
Q

Elements which occurs in free state

A

C
S
Gold
Noble gas

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3
Q

Most abundant metal

A

Aluminium

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4
Q

Third most abundant element in earth crust

A

Al

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5
Q

mjor component of many igneos minerals like mica and clay

A

Al

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6
Q

Many gemstones are impure form of

A

Al2O3

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7
Q

Impurities in gems
Ruby
Sapphire

A

Cr Ruby

Co Sapphire

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8
Q

Second most abundant metal

A

Fe

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9
Q

Naturally occurring chem substance in earth crust called

A

Minerals

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10
Q

Source of that metal

A

Ore

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11
Q

Ores of Al

A 
REMEMBER KABALI
Bauxite AlOx(OH)3-2x 0
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12
Q

Ores of Fe

A 
REMEMBER HMS Beagle is ship made of iron
Haematite fe2o3
Magnetite fe3o4
Siderite feco3
Iron pyrites fes2
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13
Q

Ores of cu

A

Copper pyrites cufes2
Malachite cuco3 cu(oh)2
Cuprite cu2o
Copper glance cu2s

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14
Q

Ores of zinc

A

Zinc blende/sphalerite zns
Calamine znco3
Zincite zno

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15
Q

For the the purpose of extraction which ores are used for
Aluminium
Iron
Copper and zinc

A

Bauxite
Oxide ores
Any of the ores

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16
Q

What is gangue

A

An ore which is usually contaminated with earthly or undesired materials

17
Q

What are the steps involved in the extraction and isolation of metals from ores

A

Concentration of the ore
Isolation of the metal from its concentrated ore
Purification of the metal

18
Q

Define concentration of ore

A

Removal of the unwanted materials ( sand and clay )from the ore is known as concentration dressing or benefaction

19
Q

Name some of the important procedures for concentration of ore(4)

A

Hydraulic washing
Magnetic separation
Froth flotation method
Leaching

20
Q

What is the principle behind hydraulic washing

A

It is based on the difference between specific gravity of the ore and the gangue particles

21
Q

Which method is also called gravity separation

A

Hydraulic washing

22
Q

What is the principle behind magnetic separation method

A

This is based on differences in magnetic properties of the ore components

23
Q

Example for magnetic separation method

A

Iron ore

24
Q

Which method is used for removing gangue from sulphur ores

A

Froth floatation method

25
Q

Example for collectors

A

Pine oil
fatty acid
xanthates

26
Q

Examples for froth stabilizers

A

Cresols

Aniline

27
Q

enhances non wettability of the mineral particles

A

Collectors

28
Q

The mineral particles become wet by

Gangue particle become wet by

A

Oil

Water

29
Q

Sometimes it is possible to separate two sulphide ores by adjusting proportion of

A

Oil to water or by using depressants

30
Q

In the case of an ore containing zns and PbS the depressant used is

A

NaCN which selectively prevents zns from coming to the froth but allows pbs to come with the froth

31
Q

When leaching is used

A

If the ore is soluble in some suitable solvent

32
Q

What are the impurities in bauxite(3)

A

Sio2
iron oxides
titanium oxide

33
Q

Describe the leaching of alumina from bauxite

A

concentration is carried out by heating the powdered ore with a concentrated solution of naoh .

34
Q

Short note on metallurgy of silver and gold

A

The respective metal is leeched with a dilute solution of NaCN or KCN in the presence of air which supplies O2.

Chemistry (1 decks)

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