Manufacturing of cement

Raw materials in cement Manufacturing:-

Argillaceous Calcareous
Blast Furnace slag Lime stone
Cement Rock Chalk
Marl Marine Shells
Shale and clay

Chemical Composition of Raw materials:-

Civil wala bhi trick:-

Loss में है A I M S

L--- Lime (62%)

S--- Silica (22%)

A--- Alumina (6%)

I---- Iron oxide (3%)

M--- Magnesia (2%)

S---- Sulphur Trioxide (1.5%)

Chemical Names:-

Lime-- (CaO)

Silica-- (SiO2)

Alumina--(Al2O3)

Iron Oxide--(Fe2O3)

Magnesia---(MgO)

Sulphur trioxide--(SO3)

Function of cement raw materials or cement compounts:-

Compound	Function
Lime	It's deficiency reduces strength & setting action.
Silica	Excess of it causes slow setting.
Alumina	Responsible for quick setting.
Iron Oxide	Gives Colour
Magnesia	Colour & Hardness
Sulphur Trioxide	Makes cement sound.

Trick-- S A L I M

S--Silica

A-- Alumina

L-- Lime

I-- Iron Oxide

M-- Magnesia

Unwanted compounds in cement manufacturing.

Fly Ash :- It increases workability, if excess causes efflorescence, reduces strength.
Gypsum :-Provides Hardness.

Important:-

Rate of control's by the controlling amount of SiO2, Iron oxide Fe2O3 and Alumina Al2O3 .
Alkalis present in cement accelerate setting of cement.

Hydration process:-

When the cement is mixed with water this process is called as H.P (Hydration process)
It is an exothermic reaction.
When these raw materials ( lime, silica, alumina, iron oxide, sulphur Trioxide) are put in kiln.
Then heat of hydration takes place and following four compounds are formed.
These four compounds are known as Bogue's Compounds.

Bogue's Compounds:-

Types of cement and Test of cement