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MIXING (MIXING METHOD (Wet Mixing Method (Mixture prepare in colloid form…
MIXING
IMPORTANCE
- Increase homogeneity of raw material
- Increase quality of final product
- Minimising operating cost when providing higher yield
- Enhancing profitability
MECHANISM
- Convection
- Shear
- Diffusion
TYPE OF MIXER
- Milling
- Mixing
- Milling-Mixing
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MIXING METHOD
Wet Mixing Method
- Mixture prepare in colloid form (based on ratio)
Water Removal
Filter Press
- Separation liquids & solids using pressure filtration
- Produce filter cake through filter cloth by water separation
Granulation
Spray Dryer
- Produce granule
- Colloid sprayed across a large container - 'temp. gradient'
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Parameters :
- Feed concentration
- Atomizer size (feed pressure & disc rotation velocity)
- Rate of hot air & feed
- Hot air temperature
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Advantages
- Complete & homogeneous mixture
- % of each materials can be controlled precisely
Disadvantages
- Long duration
- Liquid has to be removed later
- Much space needed
- Many equipment
Dry Mixing Method
- Involve weighing powder / raw materials followed by dry mixing
Advantages
- Easy equipment
- X drying necessary
Disadvantages
- Need to measure moisture in raw material
- Moisture content measurement inaccurate
- In-homogeneous mixing
- Toxic
