Process Example of Extracting V2O5 from Vanadium Slag in Yantie Alloy 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

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.

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 (%)

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