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MIXING (FACTOR AFFECTING
SHAPE/SIZE OF GRANULE (Disc rotation velocity.,…
MIXING
-
SPRAY DRYER
-
General Process Flow
Concentration
- Increase the solid content.
- Reduce amount of liquid.
Atomizer
- Creat conditions for evaporation.
- Lead to desired characteristic.
Drying
- Constant rate
phase moisture.
Separation of powder from moist gas.
- Removal of fine particles.
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EQUATION
S.G Equation
- used for wet mixing process
- determine mixture powder &
production of casting slip
-
Brogniart Equation
- estimate dry materials
- calculate density of dry glaze
& local water
W = (P - A)(S/(S - 1))
P = weight of slip
W = dry weight of solid
A = weight of water
S = S.G of solid material
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MECHANISM
CONVECTION
- Transfer component
from a region to another.
SHEAR
- Increase the components
interface via its shape.
DIFFUSION
- Exchange between
molecule/ particle in
materials neighbourhood.
METHODS
Advantages;
- Increase bonding ability & binding strength
- Less waste created
- Less investment
Disadvantages;
- Higher cost
- High dust emission
- Need to controlled water content through nozzle adjustment.
Advantages;
- Quality product
- Less fatigue cracking
- Less reflective and thermal cracking
Disadvantages;
- Higher cost
- Longer duration
- Much space needed
- Many equipment
Advantages;
- Low cost
- Less labor required
- Spraying operation is easy
Disadvantages;
- Less bond strength & tensile strength
- Wastage material
- Transportation required high controlled