February 23, 2020

Process Example of Extracting V2O5 from Vanadium Slag in Yantie Alloy Plant

Emei ferroalloy plant

The process used for atomizing vanadium slag in Panzhihua Steel Plant is shown in Figure 1.

Figure 1 Vanadium extraction process in the ferroalloy plant

Grain size of vanadium slag

20 mesh

60 mesh

80 mesh

100 mesh

Screen residue /%

twenty three

31.2

47.9

55.8

Vanadium slag composition:

V 2 O 5

Fe

SiO 2

Al 2 O 3

content/%

15.08

44.03

11.86

3.52

1. Reagents: soda ash, Na 2 CO 3 98%; ammonium sulfate, industrial products; thenardite , Na 2 SO 4 98%; sulfuric acid, industrial products; calcium chloride, industrial products.

Second, leaching, purification: leaching and phosphorus in addition to adding CaCl 2, highlighted in 0.5 ~ 1.5kg / m³, and the solution composition shown in Table 1 in the purified wet ball.

Table 1 Liquid component (g/L) after purification of atomized vanadium slag from Panzhihua Iron and Steel Co., Ltd.

Sample number

V

P

Si

Fe

K 2 O

Na 2 O

pH value

Note

1

7.7

0.0077

0.27

0.00136

0.019

7.3

9.5

Secondary slag

3

15.7

0.0076

0.27

0.0032

0.0048

31.9

9.5

Secondary slag

Third, Shen vanadium: the equipment used is mechanical stirring tank, the speed is 16r/min, direct steam heating, first into the quantitative purification liquid, then slowly add sulfuric acid, adjust the pH to 2 ~ 3 and then add ammonium sulfate, steam heating To 85 ° C, 60 min, the sulfuric acid addition coefficient is 1 ~ 1.3. The vanadium end point is controlled in the supernatant containing vanadium below 0.1g/L. The vanadium precipitation rate is 99%, and the ammonium vanadate fuse contains V 2 O 5 98% or more.

Since the ammonium polyvanadate precipitate entrains about 50% of free water, it should be washed with 1% to 2% ammonium sulfate solution to remove Na 2 O in free water.

4. Deamination and melting of ammonium polyvanadate: The melting is carried out in a 12 m3 water-cooled melting furnace. Coal for fuel gas, a first thermal decomposition stage 600 ℃, the second stage is 800 ~ 900 ℃. The composition of the V 2 O 5 fuse is shown in Table 2.

Table 2 Composition of V 2 O 5 Fuses (%)

Stove number

V 2 O 5

SiO 2

Fe

P

S

As

K 2 O

Na 2 O

3

98.87

0.275

0.269

0.0274

0.0163

0.00185

0.12

0.96

72

99.5

0.15

0.197

0.0181

0.0059

0.055

0.389

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