Preparation of pure molybdenum compound (4)

C Kelex 100 extraction
Extraction can be molybdenum, copper from the sulfuric acid medium with KeleX100. As you can see from the picture below. Balanced pH = 2.0 within a range of 0.5 molybdenum extracted priority, and as the pH is increased to balance 4, copper is preferentially extracted

When the equilibrium pH is 0.5 , the separation coefficient of Mo/Cu increases as the contact time increases. In order to better separate copper, the organic phase of the load is 150 ~ 200g /LH 2 SO 4 wash away copper. After removing copper, the molybdenum was back extracted with NaOH to obtain a Na 2 MoO 4 solution.
D   Neutral phosphorus extractant extraction a    The main reaction was extracted from molybdenum as hydrochloric acid, nitric acid, sulfuric acid solution and with TBP TBP and TOPO using TOPO molybdenum extracted from the acidic solution are as follows:

H 2 MoO 4 ( aq ) +3TBP ( org ) ==== H 2 MoO 4 · 3TBP ( org )

H 2 MoO 4 ( aq ) +TOPO ( org ) ==== H 2 MoO 4 · TOPO ( org )[next]

MoO 2 · X 2 ( aq ) +2TBP ( org ) ====MoO 2 X 2 · 2TBP ( org )   ( X=Cl or NO 3 )

MoO 2 · X 2 ( aq ) +2 TOPO ( org ) ====MoO 2 X 2 · 2 TOPO ( org )

MoO 2 SO 4 ( aq ) +2 TOPO ( org ) ==== MoO 2 SO 4 · 2 TOPO ( org )

The results of extracting molybdenum with TBP and TOPO under different conditions are shown in the table below. It can be seen from the table that the effect of extracting molybdenum from a higher concentration hydrochloric acid solution with TOPO is best.


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b  
DBBP extracted with molybdenite decomposition of pressurized oxygen from the mother liquor was extracted molybdenum, rhenium

DBBP (dibutyl butyl phosphonate) can be preferentially extracted, for example, the liquid contains Mo 21.89g /L , Re 142.5mg / L , H 2 SO 4 210.8g /L was extracted with 25% DBBP- ethylbenzene. The equilibrium concentration of the two phases was shown in the table below under different comparisons.

Extraction of molybdenum and niobium with DBBP

Compared to ( o/a )

Mo/ ( g · L -1 )

Re/ ( mg · L -1 )

H 2 SO 4 concentration / ( g · L -1 )

water   phase

The organic phase

water box

The organic phase

10

15.14

0.67

1.79

14.07

205.9

5

17.89

0.8

3.57

27.78

205.9

1

21.01

0.88

16.67

125.83

208.8

0.5

21.38

1.02

25.71

213.58

208.8

0.2

21.65

1.2

77.38

335.6

208.8

0.1

21.74

1.5

101.19

413.3

208.8

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