Cement Process

Calcination of material in the range of 600 to 900 Deg. Celsius for the decomposition of CaCO3 to CaO and CO2 is one of the main cement chemical process taking place in the preheater tower?

• True

• False

What burning zone temperature range (Highest Temperature in Cement Kiln) ?

• 1300 to 1450 °C.

• 900 to 1000 °C.

• 1100 to 1200 °C.

• 900 to 1100 °C.

Which the type of the following equipment give the highest separation efficiency of gases and dust?

• Cyclones

• Separators

• Gravel filter

• Electrostatic filter

• Bag filters

The most famous type of mill used in grinding with high production capacity is:

• Vertical mills

• Ball mills

• Horo mills

• Roller Press mills.

Cement technology is well known to be one of the highest energy consuming industries, fuel is one of the main components of cement cost, which one has the current highest cost in terms of EGP/GJ;

• Natural Gas

• Coal and Petcoke

• Heavy Fuel Oil (Mazout)

• Diesel

What is the average residue on 45 micron for OPC CEM I 42.5 N?

• 0-10 %

• 10-20 %

• 30-40 %

• 40-50 %

What is the meaning of soundness of cement?

• Ability to flow when mixed

• Ability to make ringing noise when struck

• Ability to form strong and sound structure

• Ability to retain volume after setting

Time elapsed from the instance of adding water until paste ceases to behave as fluid is called:

• Initial setting time

• Final setting time

• Intermediate setting time

• Absolute setting time

Which of the following is from Quarry operation main KPIs;

• Crusher RF, limestone oversize % and clay % in mix

• Explosive consumption in gm/ton, optimizing reserve and limestone oversize %

• Crusher kwt/ton , crusher PF and Cl % in limestone

• Crusher RF , explosive consumption in gm/ton and crusher PF

How is clay overburden treated?

• Dumped

• Removed to a remote area

• Used in rehabilitation

• IF its chemistry enable its usage in the plant as an additive in cement mill with cost efficiency, if not, rehabilitation is done