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