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The SALA Lamella Thickener

Fig. 1. Lomel lo Thickener ot o

'ffi*, *K" . '; 4 ; : b : , . - t a.:::t@ti, . n '''

at ::: aatl1i '.

, l 'B

Grovity sett l ing is o simple ond relot ivelycheop method o f seporo t ing l iqu ids ond so l idsond the convent iono l th icken inq techn ioue nqschonged very l i t t le dur ing the"post 50'yeors.A new opprooch to the th icken ing techn iqueis the introduct ion of Lomel lo sedimentoi ion.The pr inc ip le o f th icken ing by ins to l l ing in -cl ined plotes in tonks hos been known forsome t ime but there hove been mony technicolproblems. Now SALA INTERNATIONAL, in co-operot ion with the Axel Johnson lnst i tute forlndus t r io l Reseqrch hos deve loped the Lomel lqTh ickener , p r inc ipo l l y fo r opp l i co t ions in theMinerol Industry.A fu l l y s ized Lomel lo Th ickener , 100 sq . moreo, hos been instol led ot the GorpenbergMine in Sweden ond tested on leod concen-trote in both the pr imory ond secondory stoges.The results hove been extremely good ondSALA con now offer o Lomel lo Thickener which

hos mony odvontoges over convenf ionolthickeners. Spoce requirements ore substont i-ol ly reduced, usuol ly by obout 85 0/0. l t issimple in construct ion with few moving portsond con be pre-fobr icoted for ropid erect ionon si te. Removol to onother si te is olso extreme-l y s i m p l e .The des ign o l lows fo r ind iv iduo l od ius imentsof c lor i f icot ion ond of the thickeninq qreo.Addit ionol topploies con be instol led

' r"n order

to further enhonce clor i f icot ion.Appl icot ions thot hove olreody been studiedi n c l u d e :

Thickening of concentrofes, middl ings undto i l i nos .Clor i f icot ion of thickener overf lows.S lur ry des l im ing opero t ions .Cleoning of process woter.Removol of sol ids from scrubber eff luents.Removol of gr i t in leoch solut ions.

SALA INTERNATIONAL - 5-733 00 Solo - Sweden - Telex 7536

RegutotionThe smol l vo lume o f the Lomel lo Th ickenergives the pulp o shorter retent ion t ime thon ino convent ionol thickener. In order to providethe best possible thickening effecl , with ei thero constont or f luctuot ing feed, o potented,outomotic conirol system hos been developed.With this conlrol system the dischorge fromthe th ickener i s regu lo ted by cont ro l l ing thediscont inui ty betuJen the zbne of hinJeredsedimentot ion ond the compression zone (seef ig . a ) . Loco i ion o f the d iscon i inu i ty i s donee i ther by meosur ing the rod iooc t ive obsorb-t ion or meosur ing the conduct iv i t y d i f fe rencewith o new device.The s ionq l f rom the requ lo t ion dev ice thenoperotEs the sludge pu*"p or dischorge volve.When the dischorge is fed to o SALA f i l ter,the ou tomot ic leve l con i ro l in th is f i l te r con beused.

ConstruciionThe s imp l ic i t y in cons t ruc t ion o f the Lomel loTh ickener meons tho t mony vor ious types o fcons t ruc t ion moter io l con be employed, de-pend ing on the cor ros iveness o f the pu lp . Ex-

Fig . 4 .

omples ore p los t i c , m i ld s tee l , s to in less s tee lond oc id res is ton t s tee l . The Lomel lo Th ickeneris monufoc fured in th ree s tondord s izes osshown in d imens ion tob le .

Dimensions in mmE C D E FA, \ode l Pro i . o reo mr A

LT 50145LT 50t55LT I 00i45LT 100i55LT 200/45LT 200/55

50 450 3950 2170 4000 4850 224050 550 3550 2170 4000 51 50 2150

'l 00 450 4750 2750 3900 5500 2800

100 550 4300 2750 5300 5850 3500200 450 5400 3700 4750 6200 3]00200 550 5200 3800 6000 6700 4550

-ll i AL

J J

conc.

Fis . 5

RegulotionThe smol l vo lume o f the Lomel lo Th ickenergives the pulp o shorter retent ion t ime thon ino convent ionol ih ickener. In order to providethe best possible thickening effect, with ei thero constont or f luctuot ing feed, o potented,outomotic control system hos been developed.Wiih this confrol system the dischorge fromthe th ickener i s regu lo ted by cont ro l l ing thediscont inui ty between the zone of hinderedsed imento t ion ond the compress ion zone (seef ig . a ) . Loco i ion o f the d iscont inu i ty rs doneeither by meosuring the rodiooct ive obsorb-t ion or meosurino t-he conduct iv i tv di f ferencewith o new devic-eThe s ionq l f rom the requ io t ion dev ice thenopero t6s the s ludge pr t -p o t d ischorge vo lve .When the d ischorge is fed to o SALA f i l te r ,lhe ou iomot ic leve l con t ro l in th is f i l te r con beused.

ConstructionThe s imp l ic i t y in cons t ruc t ion o f the Lomel loTh ickener meons tho t mony vor ious types o fcons t ruc t ion mqter io l con be employed, de-pend ing on the cor ros iveness o f the pu lp . Ex-

M o d e l P r o j . o r e o m : A

Fig . 4 .

omples ore p los t i c , m i ld s tee l , s to in less s tee lond oc id res is ton t s tee l . The Lomel lo Th ickeneris monufoctured in three siondord sizes osshown in d imens ion tob le .

Dimensions in mmB C D E F

LT 50145LT 50/55LT r 00/45LT 100/55LT 2A0,45LT 200/55

50 450 3950 2170 4000 4850 220050 550 3550 2170 4000 51 50 21 50

I 00 450 4750 2750 3900 5500 2800100 550 4300 2750 5300 5850 3500200 450 5400 3700 4750 6200 3]00200 5so 5200 3800 6000 670a 4550

conc.

| , 9 . J .

$$

iLl

,i ' j

iw#

ehr

.s

Fig.6. Lomel lo Thickener equivolent in copoci ty to o '10 m diometerconvent ionol uni t .

DimensioningSedimentot ion tests ore done ot the SALAloborotor ies to determine necessory thicken-ing ond clor i f icot ion oreo. Field test i i rg con bedone with o loborotory Lomel lo Thickenerwi ih 3 sq. m sedimentot ion oreo.Exomples of oppl icot ions within the minerolindustry ore os fol lows:

Primory thickener for concentrotes.Secondory ih ickener fo r concentq te , c lo r i -f icot ion thickener.Midd l inos ih ickener .Th icken i r fo r to i l ings ond rec lo iming o fprocess woter.Sond ond grovel seporot ion.

Other opp l i co t ions inc lude:Cleoning of process woter.Removol of sol ids from scrubber sludges.Removol of gr i t content in leoch solut ions.S lu r ry des l im ing opero t ion .Mi l l sco le seporo t ions .Seporo t ion o f meto l hydrox ides .

SALA IU.K.I LTD.

M I L L B R O O K R O A D , S O U T H A M P T O N . S O 9 I W A

T E L E P H O N E : S O U T H A M P T O N 7 8 2 A t t T E L E ) ( 4 7 7 4 1 2

T E L E G R A M S : S A L A , S O U T H A M P T O N