CHAPTER 10

MECHANICAL SEPARATIONS

Read or print this Chapter as a single document: UnitopsCh10.SWF (353 KB) This is a FlashPaper file - to view it you need the free Macromedia Flash Player Click the FlashPaper icon above to view the Chapter in your browser, or right-click the icon ("Save Target As") to save the file to your local disk.

Introduction
The velocity of particles moving in a fluidterminal velocity
      drag force drag coefficient terminal velocity magnitude.
SedimentationStokes' Law
Gravitational Sedimentation of Particles in a Liquidzones
       velocity of rising fluidsedimentation equipment
Flotation
Sedimentation of Particles in a Gas
Settling Under Combined Forces
Cyclones- optimum shapeefficiency
Impingement separators
Classifiers
Centrifugal separations
Rate of separation centrifugal forceparticle velocity
Liquid Separationradial variation of pressure
       radius of neutral zone
Centrifuge Equipment
Filtrationrates of filtrationfilter cake resistance
       equation for flow through the filter
Constant-rate Filtration
Constant-pressure Filtrationfiltration graph
Filter-cake Compressibility
Filtration Equipment
Plate and frame filter press
Rotary filters
Centrifugal filters
Air filters
Sievingrates of throughputstandard sieve sizes
       cumulative analysesparticle size analysis
       industrial sievesair classification
Summary.
Problems.

Examples in this Chapter:
10.1. Settling velocity of dust particles
10.2. Separating of oil and water
10.3. Centrifugal force in a centrifuge
10.4. Centrifugal separation of oil in water
10.5. Centrifugal separation of milk and cream
10.6. Volume of filtrate from a filter press
10.7. Sieve analysis

Figures in this Chapter:
10.1 Continuous-sedimentation plant
10.2 Cyclone separator: (a) equipment (b) efficiency of dust collection
10.3 Liquid separation in a centrifuge
10.4 Liquid centrifuge (a) pressure difference (b) neutral zone
10.5 Liquid centrifuges: (a) conical bowl, (b) nozzle
10.6 Liquid/solid centrifuges (a) telescoping bowl, (b) horizontal bowl,scroll discharge
10.7 Filtration Graph
10.8 Filtration equipment: (a) plate and frame press (b) rotary vacuum filter (c) centrifugal filter
10.9 Particle-size analysis