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7/17/2019 Elutriation
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INSTRUCTION
Elutriation
7/17/2019 Elutriation
http://slidepdf.com/reader/full/elutriation-569110d7d7979 2/4
ELUTRIATION
AIM: To separate the given solid mix of the same density i!e! on the "asis of si#e " $singel$triator!%
Apparat$s: &l$triator' Sand!
T(&OR):
The separation of solid parti*les into several fra*tions "ased $pon their terminal velo*ities is*alled *lassi+*ations! S$ppose that parti*les having di,erent settling velo*ities are pla*ed-ith a rising *$rrent of -ater! If the -ater velo*ity "et-een the terminal velo*ities of t-oparti*les a separation -ill res$lt!
This is *alled .el$triation/! The slo-er settling parti*le -ill move $p -ord -ith -ater -hilethe faster settling parti*le -ill settle o$t to the "ottom!
&l$triator is verti*al t$"e thro$gh -hi*h a 0$id passes $p-ard at a spe*i+* velo*ity -hile asolid mixt$re -hose separation is desired is fed into the top of the *ol$mn at the "ottom of *ol$mn of -ith the 0$id several *ol$mns of di,erent diameters in series may "e $sed to"ring a"o$t a f$rther separation!
If A 1 2 are t-o di,erent materials in a solid mix! 3ith 4A542' then if the si#e range of thet-o material is large' no *omplete separation is li6ely to ta6e pla*e "e*a$se terminalvelo*ity of largest parti*les of 2 may "e greater than that of si#es that -ill res$lt from aseparation *an "e *all from ration of si#es of parti*les of A 1 2! -hi*h have the sameterminal velo*ities!
7or spheri*al parti*les
Under laminar 0o- *ondition8
Stro6e9s la- regains8
DPA
DPB=√
PB− P
PA− P
7or t$r"$lent 0o-: Ne-ton la- regime
DPA
DPB= PB− P
PA− P
4ROC&UR&:
;! Ad<$st the -ater 0o- rate thro$gh el$triator "y $sing s$ita"le rotameters !=! 4repare the mix of Sili*a sand of > to ? di,erent si#es! Add mix of sand to rising
*$rrent of -ater in the +rst el$triation t$"e!>! Samples *olle*ted from ea*h el$triator t$"e are *olle*ted dried' -eighed and
s$"<e*ted to the separation *an "e a*hieved "y ad<$sting the -ater 0o- rate!
7/17/2019 Elutriation
http://slidepdf.com/reader/full/elutriation-569110d7d7979 3/4
R&SULT:
O2S&R@ATIONS:
7eed BBBBBBBBBBBBBBBBBBBBBB gms of sili*a sand
iameter of ;st el$triation mm!
(eight of ;st el$triation mm!
@ol$me of ;st el$triation lit!
7eed BBBBBBBBBBBBBBBBBB gms of sili*a sand
iameter of II nd el$triation mm!
(eight of II nd el$triation mm!
@ol$me of II nd el$triation lit!
7eed BBBBBBBBBBBBBBBBBB gms of sili*a sand
iameter of IIIrd el$triation mm!
(eight of IIIrd el$triation mm!
@ol$me of IIIrd el$triation lit!
O2S&R@ATION TA2L&:
Sr!
No
!
Average
parti*le si#e
mm% !
4rod$*t from +rst
el$triation t$"e
gm%!
4rod$*t from
se*ond
el$triation t$"e
gm%!
4rod$*t from
third el$triation
t$"e gm%!
;!
=!
7/17/2019 Elutriation
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>!
!?!
D!E!
