Desliming and Feed Regulating Sump (FRS)

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Key Functions•Overflowswithoutlosingvaluableproduct

•Provideuniformfeeddensitytopumpsbysmoothingoutfeedsurges

•De-airslurriesforoptimumpumpandcycloneperformance

•Providepumpswithconstantsuctionheadregardlessofflowvariations

•Allowacontrolledflowofcleanwashwatertobefedintothepumpsuction

How the FRS worksSlurryentersthecentralfeedtube(1)belowwaterlevel,wheretheflowisdirectedtowardsasubmergedanti-turbulencebaffle(2).Thisbaffleextendsabovethewaterlevelandovercomesincomingturbulence.Outsidethisanti-turbulencebaffle,thewaterflowsgentlyoutwardstothesurroundingweir(3)andoverflowsintothecollectinglaunder(4).

Thesumpistaperedtowardsthebaseandisconstructedwitharemovabletake-offbox(5)forconnectiontoadischargepump.Thisboxalsoprovidesaconnectionforinjection/flushingwateranda‘dump’branch.

AllinternalwearareasarelinedwithLinatex®premiumrubberasstandard,butliningcompoundscanbeindividuallytailoredtosuitprocessconditions.

Feed Regulating Sumps

BenefitsPump Protection:Inaflatbottomsumportank,solidsbuildupinaheap,thenslump.Thiscausesaslugofsandtoenterthepumpsuction,overloadingthepump.Inextremecases,itcancausethepumpmotortooverloadandtrip.

Easy Re-starting:Ifaplantisstoppedwithoutflushing(emergenciesorpooroperation),solidscansettleinanormaltankandchokethepump.ThedesignoftheLinatex®feedregulatingsumpminimisestheriskofchoking.

Constant Pump Density:Eveninminorcases,theheap/slumpprocesscausesafluctuatingfeeddensitytothecyclone/separator,whichleadstovariableproduct.Linatex®feedregulatingsumpseliminatethisproblem.

No Need for Variable Speed Pumps or Level Control:TheLinatex®feedregulatingsump,withitsconstantoverflowheight,givesaconstantsuctionheadforthepump.Thisminimisessurges,eliminatingtheneedforvariablespeeddrivesorcomplexlevelcontrols.

Cyclone Feed Dilution:Cyclonesoperatemoreefficientlywithadilutedfeed.Separatorsoperatebestatafeeddensityof<25%solidsbymass.ByfeedingpartofthecycloneoverflowbacktotheLinatex®feedregulatingsump,inaclosedcircuit,anydesiredseparatorfeeddensitycanbeachievedwithoutaddingdilutionwater,andaconstantfeedpressurecanthereforebemaintainedinthecyclone.

Turbulence:Apipedischargingintoasumpcantakeentrainedairwellbelowthesurfaceandintothepumpsuction.Suchentrainedaircancausemanyprocessproblemswiththepumpandthecycloneandcanevenleadtopipedamage.TheLinatex®feedregulatingsumpdeflectorplateandfeedwelleliminatetheseproblems.

SelectionSumpsareusuallysizedbyconsiderationofthetotalinputintothecentralfeedtube,includinganycycloneoverflowreturnifapplicable.Otherconsiderationsincludethevelocityofapproachtotheweir,thepercentageofslimesintheeffluentandtheoverflowvolumetobeaccommodated.ThetablebelowshowsLinatex®standardsumpsizesandrespectivecapacities,butsumpscanalsobespecificallydesignedtosuitifrequired.

Standard Sump Size (m)

Standard Sump Capacity (L)

1.8x1.8 3,065

2.4x2.4 5,900

3.0x3.0 10,900

3.8x3.8 18,160

4.5x4.5 38,365

6.0x6.0 69,000

Standard Sump Sizes and Capacities

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Weir Minerals Australia Ltd

HeadOffice1MardenStreetArtarmonNSW2064Australia

AU

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