Slurry

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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. Most common use of slurry is as a mean of transportation of solids being the liquid a carrier that is pumped on a device like a centrifugal pump; the size of solid particles may vary from 1 micron up to hundreds of milliliters. The solids may settle at certain transport velocity and the mixture can behave as Newtonian or non-Newtonian fluid. Depending on the mixture the slurry may be abrasive and corrosive.

Examples[edit]

Examples of slurries include:

Calculations[edit]

Determining solids fraction[edit]

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 solids[edit]

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 fraction[edit]

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 also[edit]

References[edit]

  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 links[edit]