PPT on CEMENT

1. Presented by:-
Himanshu Chakravarti
LCI2016001
5th sem.

2. Introduction
Cement is the mixture of the calcerous,
argillacous, siliceous and other
substance.Cement is used as a binding
material in mortar,concrete and etc.

3. Background
Joseph Aspdin took out a patent in 1824 for
"PortlandCement," a material he produced by
firing finely-ground clay and limestone until
the limestone was calcined. He called it
Portland Cement because the concrete made
from it looked like Portland stone, a widely-
used building stone in England.

4. Name of Country Manufacture of cement
England 1825
Germany 1855
Belgium 1855
U.S.A 1972
India 1904
Note:-
The first cement factory in India was installed in Tamil-Nadu
in 1904 by South India Industry Limited

5. Chemical Composition of Cement
Ingredient Percentage in cement(%)
Lime 60-65
Silica 17-25
Alumina 3-8
Magnesia 1-3
Iron oxide 0.5-6
Calcium Sulphate 0.1-0.5
Sulphur Trioxide 1-3
Alkaline 0-1

6. MANUFATURING OF CEMENT
 Crushing
 Mixing (Wet Process)
 Mixing (Dry Process)
 Grinding (Ball Mill and Tube Mill)
 Burning
 Drying Zone
 Calcination Zone
 Clinkering Zone
 Grinding
 Packaging

7. CRUSHING
 Jaw crushers of various sizes are
employed for the crushing purpose.
 Raw materials are crushed by
crushers till the size of the raw
material reduces to ¾ of an inch.

8. (1) Dry Process:-

9. (2) Wet Process:-

10. Quarry face
loader
1. BLASTING 2. TRANSPORT
dumper
3. CRUSHING & TRANSPORTATION
crushing
storage at
the plant
conveyor

11. storage at
the plant
conveyor
Raw mill
1. RAW GRINDING
preheating
kiln
cooling
clinker2. BURNING

12. clinker storage
Gypsum and the secondary additives are
added to the clinker.
Finish grinding
1. GRINDING
silos
dispatch
2. STORAGE, PACKING, DISPATCH
Packaging

13. (3).Grinding:-
Grinding of clinker is done in the large tube mills.
After proper grinding gypsum (Calcium sulphate
CaSO4) in the ratio of 0.1-0.4 % is added for
controlling the setting time of cement.
Finally, fine ground cement is stored in storage
tanks from where it is drawn for packing.

14. Grinding can be done in two
methods
• Ball Mill
– Consists of cast iron drum containing
iron and steel balls of different sizes.
The principle used in ball mill s impact
and shear produced by large no. of
tumbling and rolling balls.
• Tube Mill
– Ball mill grinding is followed by tube mill
grinding. Tube mill is conical at the
discharge end with separate inlet and
outlet.
– Slower is the feeding speed finer is the
product coming out of the tube mill.

15. (3).Burning Process:-
Corrected slurry is feed to a rotary kiln which is 150-500 ft
long,8-16 ft in diameter and temperature is up to 1500-
1650 degree C.At this temperature slurry losses moisture
and forms into small lumps after that changes to the
clinkers. Clinkers are cooled in another inclined tube similar
to the kiln but lesser in length

16. A. DRYING ZONE
 The upper part of the kiln is known as drying zone.
 The temperature is about 200-500°C.
 Most of the water gets evaporated from the slurry by
means of hot gases.
B. CALCINATING ZONE
 This the middle zone of the kiln with temperature
around 1000°C.
 Organic matter burns away and CaCO3 decomposes to
quick lime and CO2 escapes out. The material forms
small lumps called as nodules.

17. C. CLINKERING ZONE
This is lowest portion of kiln with a temperature of about
1400-1600°C. Lime and clay nodules melts with chemical
fusion and gives calcium aluminates and silicates. These
silicates and aluminates then fuse together to form small
hard stones called Clinkers which than fall down from
lower end of the kiln.
 CaCO3  CaO + CO2 Calcium Oxide
 2CaO + SiO2  Ca2SiO4 Di calcium Silicate
 3CaO + SiO2  Ca3SiO5 Tri calcium Silicate
 3CaO + Al2O3  Ca3Al2O6 Tri calcium Aluminate
 4CaO + Al2O3+Fe2O3  Ca4Al2Fe2O10 Tetra calcium Aluminoferrite

18. PACKAGING
The ground powder is
packed by automatic
machines in a 50kg bag.
This is then dispatched to
the markets where it is
sold for constructions of
cities.

19. TYPES OF CEMENT
1. Ordinary Portland Cement
2. Sulphate Resisting Cement
3. Rapid Hardening Cement
4. Quick Setting Cement
5. Low Heat Cement
6. High Alumina Cement
7. Air Entraining Cement
8. White Cement

20. TO CHECK THE QUALITY OF
CEMENT IN THE FIELD
 Colour is greenish grey.
 One feels cool by thrusting one’s
hand in the cement bag.
 It is smooth when rubbed in
between fingers.
 A hanndful of cement thrown in a
bucket of water should float.

21. QUALITY TESTS OF CEMENT
1) Fineness test
2) Consistency test
3) Setting Time Test
4) Compressive Strength Test

22. VERTICAL SHAFT KLIN TECHNOLOGY
Vertical shaft klin technology has been
successfully employed by mini cement plants.
The VSK have pan noduliser or pelletiser. The
uniform pellets so formed can be fed into the
vertical shaft Klin and the cement can be
produced. Proper proportions of raw material
must be taken to get good quality of clinkers.
 Black Metal Process : Raw materials are
ground along with coal and then converted
into pellets with about 15% water.
 Fuel Slurry Process: Raw materials are dry
ground and coal is wet ground separately
and then mixed to get pellets which move
down VSK.

23. ADVANTAGES OF VERTICAL SHAFT KLIN
Vertical Shaft Klin has following advantages:
 No dust discharge in the atmosphere due to pellets.
 Clinker clogging is avoided because no low melting
constituents are formed.
 Wearing of grinder machinery and cost of grinding is
removed
 Plant is quite compact.

24. •Production of Concrete
• Construction Purpose
o Building (Floors, Beams,
Columns, Roofing)
o Transport (Roads,
Pathways, Crossings, Bridge)
o Water (Pipes, Drains,
Canals)
o Agriculture (Irrigation,
Housing)
USES OF CEMENT

25. DISADVATAGES
?

26. Additives of cement
Fly ash Rice husk ash Slag
Some portion of cement can be replaced
with above materials to reduce the
quantity and cost of using of cement.

27. Ready-mix Concrete (RMC)
Concrete that is
manufactured in a factory
or batching plant, according to a
set recipe, and
then delivered to a work site
,by truck mounted transit mixers .

28. Trans mixerRMC plant
Transit mixer working

29. Why Cement ?
Easy to handle and use
Good Binder
Almost any kind of structure or finishing
can be obtained
High compressive Strength
Flexible & mouldable
Easily available

30. GLOBAL SCENARIO
•Today, it is estimated that there are around 1500 integrated
cement production plants in the world.
•It is estimated that world cement consumption is to rise on an
average between 3.6% and 4.8% per year in the coming years.
•Most of the growth is coming from Central and Eastern Europe
and Asia, growth in mature markets also looks healthy.
•The share of the four largest firms account only for 23% of the
overall demand.
•LAFARGE and CEMEX have become very strong global cement
players.

31. Why Burn Wastes?
A cement kiln is a proven technology for
recycling by beneficial REUSE of solid and
hazardous wastes.
The benefits are:
– energy recovery
– material recovery
– economics
– environmental preservation

32. Some leading cement manufacturers
 Lafarge
 Binani
 J K Lakxmi
 ESSROC
 ACC
 Birla
 Ambuja
 Prism
 Ultratech
 Jaypee