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

Calcination reaction of limestone (CaCO₃ → CaO + CO₂) goes to completion in the rotary kiln, because

A

CaO is not dissociated

B

CO₂ escapes continuously

C

Of high calcination temperature

D

CaO is more stable than CaCO₃

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

A

Vertical shaft

B

Rotary

C

Fluidised bed

D

Fixed bed

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

A

Tunnel

B

Rotary

C

Vertical shaft

D

Both B and 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

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

In case of calcination of limestone, CaCO₃ CaO + CO₂, the addition of more of CaO will result in __________ in the concentration of CO₂.

A

No change

B

Increase

C

Decrease

D

Unpredictable from the data

Which of the following option is true about rotary tables? Statement 1: Index is not used with optical rotary table. Statement 2: Accurate worm and gear rotary table can be used with an index plate.

A

T, T

B

T, F

C

F, T

D

F, F

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

Lime obtained from calcination of Pure Limestone is called:

A

Quick Lime

B

Pure Lime

C

Lean Lime

D

Rich Lime

Calcination of limestone and dolomite takes place at which temperature(degree Celsius)?

A

100

B

500

C

1000

D

2000

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

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