About ant note on prepare cement and raw materials

1. CEMENT

2. RAW MATERIALS:
• Iron oxide
• Aluminium oxide
• Lime stone
• Silicon oxide
• Megnesium oxide

3. VARIETIES OF CEMENT IN INDIA

4. MANUFACTURING PROCESS

7. Components of Cement:
Comparison of Chemical and Physical Characteristics
Property Portland cement Siliceousfly ash Calcareousfly ash Slag cement Silica fume
Content (%)
SiO2 21.9 52 35 35 85–97
Al2O3 6.9 23 18 12 —
Fe2O3 3 11 6 1 —
CaO 63 5 21 40 < 1
MgO 2.5 — — — —
SO3 1.7 — — — —
Specific surface
(m2/kg)
370 420 420 400
15,000–
30,000
Specific gravity 3.15 2.38 2.65 2.94 2.22
General use in concrete Primary binder Cement replacement Cement replacement Cement replacement Property enhancer

8. MANUFACTURING PROCESS ARE TWO
TYPES:
• WET PROCESS
• DRY PROCESS

9. COMPARISON OF DRY PROCESS AND WET
PROCESS:
Criteria Dry process Wet process
Hardness of raw material Quite hard Any type of raw material
Fuel consumption Low High
Time of process Lesser Higher
Quality Inferior quality Superior quality
Cost of production High Low
Overall cost Costly Cheaper
Physical state Raw mix (solid) Slurry (liquid)

12. K.MANTHIRA
MOORTHY
III-B.SC (CHEMISTRY)