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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 ÌÇÐÄÔ´´ Bangi, Selangor Darul
Ehsan, Malaysia 2Pusat Sains Terkehadapan, Fakulti Sains dan
Teknologi, Universiti Kebangsaan Malaysia,
43600 ÌÇÐÄÔ´´
Bangi, Selangor Darul Ehsan, Malaysia 3Pusat Sains
Bumi dan Alam Sekitar, Fakulti
Sains dan Teknologi, Universiti Kebangsaan
Malaysia, 43600 ÌÇÐÄÔ´´ Bangi, Selangor Darul Ehsan, Malaysia Diserahkan: 25 April 2018/Diterima: 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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10-28. *Pengarang untuk surat-menyurat; email: aznan@ukm.edu.my
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