This articlemay be too technical for most readers to understand.(September 2022) |
Aslurryis a mixture of denser solids suspended in liquid, usually water. The most common use of slurry is as a means of transporting solids or separating minerals, the liquid being a carrier that is pumped on a device such as acentrifugal pump.The size of solid particles may vary from 1micrometreup to hundreds ofmillimetres. The particles may settle below a certain transport velocity and the mixture can behave like aNewtonianornon-Newtonianfluid. Depending on the mixture, the slurry may be abrasive and/or corrosive.
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![](https://upload.wikimedia.org/wikipedia/commons/thumb/0/0c/Potato_starch_slurry.jpg/220px-Potato_starch_slurry.jpg)
Examples
editExamples of slurries include:
- Cement slurry, a mixture ofcement,water, and assorted dry and liquid additives used in thepetroleumand other industries[1][2]
- Soil/cement slurry, also called Controlled Low-Strength Material (CLSM), flowable fill, controlled density fill, flowable mortar, plastic soil-cement, K-Krete, and other names[3]
- A mixture ofthickening agent,oxidizers, and water used to form agel explosive[4]
- A mixture ofpyroclasticmaterial, rocky debris, and water produced in avolcanic eruptionand known as alahar
- A mixture ofbentoniteand water used to makeslurry walls
- Coal slurry,a mixture ofcoal wasteand water, or crushed coal and water[5]
- Slip,a mixture ofclayand water used for joining, glazing and decoration of ceramics and pottery.
- Slurry oil,the highest boiling fraction distilled from the effluent of anFCC unitin anoil refinery.It contains a large amount of catalyst, in form of sediments hence the denomination of slurry.
- A mixture of wood pulp and water used to makepaper
- Manure slurry, a mixture of animal waste, organic matter, and sometimes water often known simply as "slurry" inagriculturaluse, used asfertilizerafter aging in aslurry pit
- Meat slurry,a mixture of finely ground meat and water, centrifugally dewatered and used as a food ingredient.
- An abrasive substance used inchemical-mechanical polishing
- Slurry ice,a mixture of ice crystals, freezing point depressant, and water
- A mixture of raw materials and water involved in therawmillmanufacture ofPortland cement
- Abolusof chewed food mixed withsaliva[6]
- A mixture of epoxy glue andglass microspheresused as a filler compound around core materials insandwich-structured compositeairframes.
Calculations
editDetermining solids fraction
editTo determine the percent solids (or solids fraction) of a slurry from the density of the slurry, solids and liquid[7]
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 sincespecific gravityof water is taken to be 1, this relation is typically written:
even though specific gravity with units tonnes/m3(t/m3) is used instead of the SI density unit, kg/m3.
Liquid mass from mass fraction of solids
editTo 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
editEquivalently
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 avolumetricbasis
- is the solids fraction of the slurry on amassbasis
- 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
- is the bulk specific gravity of the solids
See also
editReferences
edit- ^"Shlumberger: Oilfield glossary".Archived fromthe originalon 2012-05-31.Retrieved2012-05-06.
- ^"Rheonova: Measuring rheological properties of settling slurries".Archivedfrom the original on 2020-04-18.Retrieved2013-11-30.
- ^"Portland Cement Association: Controlled Low-Strength Material".Archivedfrom the original on 2013-10-17.Retrieved2012-05-06.
- ^"IRing - Creators of Aegis, an underground drill & blast planning software that helps a mine improve its effectiveness and efficiency".Archivedfrom the original on 2020-08-07.Retrieved2020-01-02.
- ^Red Valve Company: Coal Slurry Pipeline
- ^Rheonova: Measuring food bolus propertiesArchived2013-11-30 atarchive.today
- ^Wills, B.A. and Napier-Munn, T.J,Wills' Mineral Processing Technology: an introduction to the practical aspects of ore treatment and mineral recovery,ISBN978-0-7506-4450-1,Seventh Edition (2006), Elsevier, Great Britain
External links
edit- Bonapace, A.C.A General Theory of the Hydraulic Transport of Solids in Full Suspension
- Ravelet, F.; Bakir, F.; Khelladi, S.; Rey, R. (2013)."Experimental study of hydraulic transport of large particles in horizontal pipes"(PDF).Experimental Thermal and Fluid Science.45:187–197.doi:10.1016/j.expthermflusci.2012.11.003.S2CID55554454.
- Ming, G., Ruixiang, L., Fusheng, N., Liqun, X. (2007).Hydraulic Transport of Coarse Gravel—A Laboratory Investigation Into Flow Resistance.