Calcination of limestone is not done in a __________ kiln for producing lime.

Calcination of limestone to produce lime is done in a __________ kiln.

A

Tunnel

B

Rotary

C

Vertical shaft

D

Both B and C

Thermal efficiency of a limestone calcination rotary kiln may be around __________ percent.

A

20

B

40

C

65

D

80

How much temperature is maintained during quicklime manufacture in the calcination zone of the vertical shaft kiln?

A

500°C

B

750°C

C

1000°C

D

1500°C

Rotary kilns meant for calcination of limestone are lined with chrome magnesite in __________ zone.

A

Preheating

B

Cooling

C

Burning

D

All of the above

Which of the following is used for calcination of limestone and dolomite in industrial practice?

A

Fluidised bed reactor

B

Moving bed reactor

C

Fixed bed reactor

D

None of these

Rotary lime kiln is an example of a/an __________ system.

A

Closed

B

Open

C

Isolated

D

Non-thermodynamic

Calcination of iron ores is done

A

To remove moisture

B

To remove carbonic acid

C

By roasting in heaps

D

All the above

Quick lime (or caustic lime)

A

Is obtained by the calcination of pure lime stone

B

Has great affinity to moisture

C

Is amorphous

D

All the above

If the iron ore contains clay as an impurity, the flux added during calcination, is

A

Clay

B

Lime stone

C

Argillaceous iron ore

D

All the above

Calcination of gypsum produces

A

Plaster of paris

B

Salt cake

C

Nitre cake

D

Lime

Calcination of limestone is not done in a __________ kiln for producing lime.

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