Method for oxygen-enriched calcification calcination of high-grade vanadium slag
A calcified roasting and high-grade technology, which is applied in the field of calcified roasted vanadium slag, can solve the problems of increasing the material handling capacity of roasting equipment, reducing the roasting temperature, and high conversion rate of roasted vanadium, so as to achieve the effect of perfecting the industrialization technology and reducing the roasting temperature
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Embodiment 1
[0028] High-grade vanadium slag (containing V 2 o 512.57wt%, CaO 1.64wt%) and limestone (containing CaO 52.38wt%) according to the mass ratio of vanadium slag:limestone=100:13.5 batching, mixing, roasting in the electrothermal rotary tube of Φ149×2000mm. The rotary tube controls the roasting temperature of the high-temperature section to be 880°C, the residence time of the mixture in the high-temperature section is controlled at 20-30min, and the oxygen volume content in the atmosphere in the rotary tube is controlled at 12-14% by adjusting the ratio of nitrogen and compressed air. Intake flow according to the intake flow (m 3 / h): feeding speed (Kg / h) = 2:1. Grind the clinker obtained by roasting until the particle diameter is less than 0.125mm, and then take 100g to test the effect of dilute sulfuric acid leaching. The ratio is 2:1. After the acid leaching reaction is completed, filter, wash, and dry the residue. The residue obtained after drying is 93.62g, and the V in ...
Embodiment 2
[0030] High-grade vanadium slag (containing V 2 o 5 16.52wt%, CaO 2.04wt%) and limestone (containing CaO 52.38wt%) according to the mass ratio of vanadium slag:limestone = 100:16, mixed and roasted in an electrothermal rotary tube of Φ149×2000mm. The rotary tube controls the roasting temperature of the high-temperature section to be 860°C, the residence time of the mixture in the high-temperature section is controlled at 40-50 minutes, and the oxygen volume content in the atmosphere in the rotary tube is controlled at 15-17% by adjusting the ratio of nitrogen and compressed air. Intake flow according to the intake flow (m 3 / h): feeding speed (Kg / h) = 2:1. Grind the clinker obtained by roasting until the particle diameter is less than 0.125mm, and then take 100g to test the effect of dilute sulfuric acid leaching. The ratio is 2:1. After the acid leaching reaction is completed, filter, wash, and dry the residue. The residue obtained after drying is 92.27g, and the V in the...
Embodiment 3
[0032] High-grade vanadium slag (containing V 2 o 5 19.36wt%, CaO 2.16wt%) and limestone (containing CaO 52.38wt%) according to the mass ratio of vanadium slag:limestone = 100:20, mixed evenly and roasted in the electrothermal rotary tube of Φ149×2000mm. The rotary tube controls the roasting temperature of the high-temperature section to be 830°C, the residence time of the material in the high-temperature section is controlled at 50-60min, and the oxygen volume content in the atmosphere in the rotary tube is controlled at 19-21% by adjusting the ratio of nitrogen and compressed air. The air flow is according to the intake flow (m 3 / h): feeding speed (Kg / h) = 2:1. Grind the clinker obtained by roasting until the particle diameter is less than 0.125mm, and then take 100g to test the effect of dilute sulfuric acid leaching. The ratio is 2:1. After the acid leaching reaction is completed, filter, wash, and dry the residue. The residue obtained after drying is 90.20g, and the ...
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