The Atomic Energy Organization of Iran (AEOI) a-10!1!51-621f048

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


2/6

. . .

52

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.

)(.

....

]1[.23

3500 ]2[.

]34[.

.

.

-177 .

]56[.

.

]7[.

5

.

]8[.

.

]9[.

.

.

EHPA2D


3/6

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


4/6

. . .

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)


5/6

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)


6/6

. . .

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).

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The Atomic Energy Organization of Iran (AEOI) a-10!1!51-621f048