The Atomic Energy Organization of Iran (AEOI) a-10!1!51-621f048
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Transcript of The Atomic Energy Organization of Iran (AEOI) a-10!1!51-621f048
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7/31/2019 The Atomic Energy Organization of Iran (AEOI) a-10!1!51-621f048
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J. of Nuclear Sci. and Tech.
5356-511389No. 53, pp. 51-56, 2010
Sci. and Tech. note
(Yb)
5
1*
2
1
1
-1 -14115-143:
2- 11365-8486:
: (Yb(III 5EHPA2D
.
5
20.
pH pH
.2pH=9/99835/138/995/84/27
.)A/O(
..-9A/O=
2pH=2.
.
: 5EHPA2D
Study of Parameters Affecting the Extraction of Ytterbium from Anomaly
No.5 of Saghand Ore Leach Solution
M. Abdollahy1, S. Alamdar Milani*
2, M.J. Koleini
1, M.R. Samadzadeh Yazdi
1
1- Mineral Processing Group, Department of Mining Engineering, Tarbiat Modares University, P.O.Box: 14115-143,Tehran Iran
2- Nuclear Fuel Cycle Research School, Nuclear Science and Technology Research Institute, AEOI, P.O.Box: 11365-8486,Tehran Iran
Abstract:Extraction of ytterbium from anomaly No.5 of Saghand leach solution using D2EHPA asextractant, kerosene as a diluent, and optimization of the effective parameters were investigated. Inaddition to uranium and thorium, rare earths elements also exist in Saghand ore. The effect of pH on theextraction of Yb and other existing elements shows that their extractions increase by increasing pH. Theextraction of Yb, U, La, Y, Ce and Fe in pH=2 were 99.9, 83, 13.5, 99.8, 8.5 and 27.4%, respectively.The increasing of the A/O ratio decreases the extraction of other elements more than Yb where it resultedin the increasing of the Yb separation. The theoretical number of extraction stages were determined in
pH=2 and A/O=9 using McCabe-Thiele diagram. Stripping of the organic phase was also carried out bydifferent concentrations of nitric acid.
Keywords: Ytterbium, Rare Earths Elements, Saghand Ore, Solvent Extraction, D2EHPA
:[email protected]*email30/1/89:27/5/88:
51
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. . .
52
1-
.
.
)(.
....
]1[.23
3500 ]2[.
]34[.
.
.
-177 .
]56[.
.
]7[.
5
.
]8[.
.
]9[.
.
.
EHPA2D
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531389
53
2-EHPA2D.
5EHPA2D
.)U, Fe, La, Ce, Y(
.
.
]79[.93%
5
336]13[.
.
.
2-
45 )5(.
.
12
.
]14[.
.
XRF1.
.)2(
200]15[ 8/10
233/5
.
.2.
pH
.EHPA2D43/322
98/0 .20
30
.
1/0
)
]10[.(
)3(.
1-5
XRF
ppm8005O2Nbppm600SrO6/0%3O2Cr8/46%2SiO
ppm600BaOppm600ZnO3/0%MnO5/16%CaO
4/1%3O2Lappm9502ZrO6/0%5O2P0/11%3O2Fe
5/1%3O2Ce2/0%PbO6/0%3O2Y1/9%2TiO
1/0%2ThO1/0%O2K2/6%MgO
1/0%3O2Uppm6003SO7/3%3O2Al
2-
5
FeYbYCeLaU
(ppm)83080109010801290243
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. . .
54
.
)(
.
3-
3-1pH
3pH
1/0
EHPA2D)3/3(
.
3pH= )Y(2pH=3
80.pH
.32pH=3
pH
=pH2
.
pH37/3
.
EHPA2D3=pH
.
EHPA2D50
]12[.
3-2
2pH=30
1/0)3/3
()A/O(
135791317.
EHPA2D4) .
pH2pH=
Ybppm24(.
3-pH
1/0EHPA2D)3/3
(1A/O=
30.
4-1/0)3/3
(EHPA2D2=pH30.
3-3)A/O(
A/O
.
A/O
.
A/O5.
A/O5
)32pH=
(.
0
10
20
30
40
50
60
70
80
90
100
0 1 2 3 4
U
La
Ce
Y
Fe
YbPercenta
geextracted
pH
0
25
50
75
100
125
150
175
200
225
0 2 4 6 8 10 12
Metalconcen
trationinorganicphase(ppm)
Metal concentration in acqueous phase (ppm)
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531389
55
5-A/O
1/0)3/3(EHPA2D
2=pH30.
A/O
.
EHPA2D
Yb
.
A/O.
A/O
.
6-)4(
9A/O=
.
.
3-4
1/0)
3/3(EHPA2D2pH=
30)5(
.
]10[.7
.
6--1/0
)3/3(EHPA2D2=pH
30.
7-
1=A/O30
.
7
393
5.
510.
5241
31 .
0
10
20
30
40
50
60
70
80
90
100
0 1 2 3 4 5 6 7 8 9 10
Yb
U
Y
Fe
La
Ce
Percentag
eextracted
A/O
0
10
20
30
40
50
60
70
80
90
100
0.01 0.1 1 10
U
La
Ce
Y
Fe
Yb
Percentagestriped
Concentration of nitric acid (moles/litre)
Metalconcentrationin
orqanicphase(ppm)
Metal concentration in acqueous phase (ppm)
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. . .
56
.
3
1
2388
.
-4
EHPA2D
.
.
.
.
.
YCeLaUFe
A/O.
5
. Yb.
.
:
1- Di-(2-Ethylhexyl) Phosphoric Acid
2- Digestion
3- Induced Coupled Plasma (ICP)
4- McCabe-Thiele
5- Stripping
References:
1. R. Lundi, J.R. Wilson, Rare earth metals findinteresting new uses despite lack of engineering
data, Imperial College Press (2002).
2. J.B. Hedrick, Rare earths, U.S. GeologicalSurvery Minerals Yearbook, 1, 60, 1-60, 16(1999).
3. P. Jones, F. Wall, T. Williams, Rare earthminerals, Chapman & Hall Inc (1996).
4. J. Lefond, Industrial minerals and rocks, Vol.2, Fifth Edition, American Society of Mining
Engineers, New York (1983).
5. C.K. Gupta, N. Krishnamurthy, Extractivemetallurgy of rare earths, CRC Press, (2005).
6. K. Memar, Mineralogy and petrochemistry ofa part of saghand area, Ph.D Thesis University
of Bombay, 1-43 (1991).
7. C.K. Gupta, T.K. Mukherjee, Hydrometallurgyin extraction process, CRC Press (1990).
8. ......
).1387(
9. J. Rydberg, M. Cox, C. Musikas, G. Choppin,Solvent extraction and practice, Second
Edition, MARCEL DEKKER Inc (2004).
10.T. Sato, Liquid-liquid extraction of rare-earthelements from aqueous acid solutions by acid
organophosphorus compounds,
Hydrometallurgy, Vol. 22, 121-140 (1989).
11. . 5
).1383(
12.G.W. Mason, Process for separation of the rareearths by solvent extraction, U.S Patent, No.4016237 (1975).