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A slurry composed of glass beads in silicone oil flowing down an inclined plane

A slurry is a mixture of solids with specific gravity greater than 1 suspended in liquid, usually water. The most common use of slurry is as a means of transporting solids, the liquid being a carrier that is pumped on a device such as a centrifugal pump. The size of solid particles may vary from 1 micron up to hundreds of millimeters. The particles may settle below a certain transport velocity and the mixture can behave as a Newtonian or non-Newtonian fluid. Depending on the mixture, the slurry may be abrasive and/or corrosive.

Contents

ExamplesEdit

Examples of slurries include:

CalculationsEdit

Determining solids fractionEdit

To determine the percent solids (or solids fraction) of a slurry from the density of the slurry, solids and liquid[6]

 

where

  is the solids fraction of the slurry (state by mass)
  is the solids density
  is the slurry density
  is the liquid density

In aqueous slurries, as is common in mineral processing, the specific gravity of the species is typically used, and since   is taken to be 1, this relation is typically written:

 

even though specific gravity with units tonnes/m^3 (t/m^3) is used instead of the SI density unit, kg/m^3.

Liquid mass from mass fraction of solidsEdit

To determine the mass of liquid in a sample given the mass of solids and the mass fraction: By definition

 

therefore

 

and

 

then

 

and therefore

 

where

  is the solids fraction of the slurry
  is the mass or mass flow of solids in the sample or stream
  is the mass or mass flow of slurry in the sample or stream
  is the mass or mass flow of liquid in the sample or stream

Volumetric fraction from mass fractionEdit

 

Equivalently

 

and in a minerals processing context where the specific gravity of the liquid (water) is taken to be one:

 

So

 

and

 

Then combining with the first equation:

 

So

 

Then since

 

we conclude that

 

where

  is the solids fraction of the slurry on a volumetric basis
  is the solids fraction of the slurry on a mass basis
  is the mass or mass flow of solids in the sample or stream
  is the mass or mass flow of slurry in the sample or stream
  is the mass or mass flow of liquid in the sample or stream komi
  is the bulk specific gravity of the solids

See alsoEdit

ReferencesEdit

  1. ^ Shlumberger: Oilfield glossary
  2. ^ Rheonova : Measuring rheological propertis of settling slurries
  3. ^ Portland Cement Association: Controlled Low-Strength Material
  4. ^ Red Valve Company: Coal Slurry Pipeline
  5. ^ Rheonova : Measuring food bolus properties Archived 2013-11-30 at Archive.today
  6. ^ Wills, B.A. and Napier-Munn, T.J, Wills' Mineral Processing Technology: an introduction to the practical aspects of ore treatment and mineral recovery, ISBN 978-0-7506-4450-1, Seventh Edition (2006), Elsevier, Great Britain

External linksEdit