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Sains Malaysiana 48(2)(2019): 419–424 http://dx.doi.org/10.17576/jsm-2019-4802-20
Kajian Keberkesanan
Pengekstrakan Torium
daripada Larutan Asid Hidroklorik menggunakan Di(2-Etilheksil) Asid Fosforik (D2EHPA) (Effectiveness Study of Thorium Extraction
from Hydrochloric Acid using Di (2-Ethylhexyl) Phosphoric Acid (D2EHPA)) AHMAD HAYATON
JAMELY
MOHD
SALEHUDDIN1,
ELI
SYAFIQAH
AZIMAN1,
CHE
NOR
ANIZA
CHE
ZAINUL
BAHRI1,
MUHAMMAD
AMIRUL
RAFIQ
AHMAD
AFFENDI1,
WAN
MOHD
RAZI
IDRIS3
& AZNAN FAZLI ISMAIL1,2* 1Program
Sains Nuklear, Fakulti Sains dan
Teknologi, Universiti
Kebangsaan Malaysia, 43600 UKM Bangi, Selangor Darul
Ehsan, Malaysia 2Pusat Sains Terkehadapan, Fakulti Sains dan
Teknologi, Universiti Kebangsaan Malaysia,
43600 UKM
Bangi, Selangor Darul Ehsan, Malaysia 3Pusat Sains
Bumi dan Alam Sekitar, Fakulti
Sains dan Teknologi, Universiti Kebangsaan
Malaysia, 43600 UKM Bangi, Selangor Darul Ehsan, Malaysia Received: 25 April 2018/Accepted:
14 September 2018 ABSTRAK Pengekstrakan torium daripada
larutan akueus
torium tetraklorida (ThCl4)
telah dilakukan
dengan menggunakan larutan organik Di-(2-etikheksil)
asid fosforik
dalam kerosen (D2EHPA/K). Objektif kajian ini adalah untuk
menentukan parameter kepekatan
organik dalam
pelarut dan masa campuran optimum yang mempengaruhi
kecekapan pengekstrakan.
Campuran torium - nadir bumi hidroksida ([Th-RE](OH)4) daripada sumber kepekatan monazit tempatan dilarutkan dalam asid hidroklorik
(HCl) pada kepekatan 3 dan 4 molariti. Larutan akueus [Th-RE](OH)4 ini dicampurkan dengan pelarut organik D2EHPA/K
pada kepekatan
berbeza iaitu 10%, 20% dan 30%. Sebatian diaduk selama 5 hingga 20 min sebelum fasa larutan akueus
dan organik
dipisahkan. Kepekatan torium sebelum dan selepas pengekstrakan
dianalisis menggunakan
Spektrometri Jisim Plasma Gandingan Teraruh (ICP-MS).
Keputusan kajian
mendapati peningkatan kepekatan torium dalam larutan akueus
(Th-RE)OH4 dalam julat 119.40 ± 3.43 – 121.13
± 3.18 ppm berbanding sebelumnya.
Kecekapan pengekstrakan
optimum bagi torium
ialah 99.8%, menggunakan D2EHPA/K
pada kepekatan
30%. Keputusan kajian juga mendapati masa optimum bagi proses
campuran dan
pemisahan torium dalam larutan akueus
kepada fasa
organik masing - masing adalah 5 min. Sehubungan dengan itu, kajian ini
membuktikan D2EHPA berpotensi
untuk digunakan
sebagai agen pengekstrakan
torium daripada
larutan asid hidroklorik.
Kata kunci: D2EHPA; kerosen; monazit; pengektrakan torium ABSTRACT Thorium extraction from thorium
tetrachloride aqueous solution (ThCl4) was
performed by using organic solution of Di-(2-ethylhexyl) phosphoric
acid in kerosene (D2EHPA/K). The study aims to determine
the organic concentration parameter in the solvent and the mixing
time that influences the extraction efficiency. Mix thorium-rare
earth hydroxide (Th-RE)(OH)4 from local monazite concentrates was
dissolved in 3 M and 4 M of hydrochloric acid, respectively. The
aqueous solution of (Th-RE)(OH)4 was
mixed with the organic solvent D2EHPA/K at different concentrations
of 10%, 20%, and 30%, respectively. The mixture was stirred for
5 to 20 min before the aqueous and organic phase were separated.
Thorium concentrations before and after extraction were analysed
using Inductively Coupled Plasma Mass Spectrometry (ICP-MS).
The result indicates that thorium concentrate in aqueous solution
(Th-RE)OH4 is
in a range of 119.40 ± 3.43 – 121.13 ± 3.18 ppm. The highest extraction
efficiency for thorium was 99.8%, extracted using D2EHPA/K at 30% of concentration.
The result indicated that the optimum mixing and separation times
of thorium from aqueous solution into organic phase was 5 min, respectively.
Therefore, this research proves that D2EHPA is potentially be used as
thorium extraction agent digested in hydrochloric acid. Keywords: D2EHPA; kerosene; monazite;
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