18 Questions
What is the purpose of size enlargement in particulate systems?
To improve flowability and control solubility in food products
Which method of agglomeration involves introducing heat?
Sintering
In the stages of agglomeration rate processes, what happens during layering?
Material is deposited on the surfaces of nuclei
What is the primary objective of using glidants in particulate systems?
To reduce interparticle friction and improve flowability
Which method of agglomeration involves agglomeration by agitation?
Granulation or Agitative Agglomeration
Why may fine particles be difficult to discharge from hoppers?
As a result of vibration or mechanical stirring
Which mechanism involves deforming solids until they break or tear?
Comminution
What type of force is involved in coarse reduction of hard solids to give fines?
Impact
According to Rittinger's Law, what is the relationship between energy required and particle size in product?
Directly proportional
Which process involves fine pulverization when the size of the product reaches the micrometer range?
Attrition
What does Walker et al. propose about the energy required for size reduction?
It is inversely proportional to the size to some power
In crushing laws, what does Rittinger's Law imply about reducing material from 100 mm to 50 mm compared to 50 mm to 33.3 mm?
Same energy is required for both reductions
Which type of analysis is more precise for calculating average particle size, specific surface area, or particle population?
Cumulative analysis
What is the basis for determining screen effectiveness in Method 1?
Recovery in the product of desired material in the feed
Which factor plays a crucial role in determining the capacity of a screen?
Ratio of open area to total area on the screen
What is the formula typically used to calculate the capacity of screens for dense materials like ores?
$(5 to 20) \times \text{screen area} \times \text{screen aperture per 24 hrs}$
What distinguishes Method 2 for determining screen effectiveness from Method 1?
Recovery based on material balance
How is cumulative analysis different from differential analysis regarding assumptions about particle size?
Cumulative analysis assumes particles are equal in size within a fraction.
Test your knowledge on particulate systems and how flowability can be enhanced using glidants. Learn about the challenges associated with discharging fine particles from hoppers and the environmental and health issues they may cause.
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