Method for recovering vanadium, titanium and iron from vanadium titanium magnetite

[0025] Example 1:

[0026] Vanadium-titanium magnetite composition: TFe56%, TiO 2 12.5%, V 2 O 5 0.64%. Particle size -100 mesh, 100%, with <1mm anthracite coal powder, fixed carbon 80.29%, volatile content 6.96%, ash content 11.62%, and sulfur content 0.54%. The ratio of raw materials is: iron ore: coal powder: syrup=100:24:7. After mixing, press the powder tablet machine into 35×30×25mm block without drying, and put the block material on the rotary hearth furnace pan with a thickness of 5-6cm through a distributor.

[0027] The rotary hearth furnace is heated with coal gas, and the maximum temperature is 1350℃. After 20 minutes, a metallized block with a metallization rate of >90% is obtained. The block is spirally discharged into the duct connected to the electric furnace at about 1200°C and enters the melting electric furnace. The block material is continuously fed into the electric furnace for melting, and the temperature of the electric furnace is controlled at 1500-1600°C. After heating, the molten iron containing vanadium and titanium slag are quickly melted. Titanium slag and vanadium-containing molten iron are periodically discharged into the molten iron ladle and slag pot. The main components of the vanadium-containing molten iron are: carbon [C] 3.8%, vanadium [V] 0.42%, silicon [Si] 0.38%, and titanium [Ti] ] 0.2%, the vanadium-containing molten iron is directly blown into the converter to obtain vanadium pentoxide (V 2 O 5 ) 14.5% vanadium slag. After melting in the electric furnace, TiO containing about 53% titanium dioxide is obtained 2 The titanium slag can be directly used as the raw material for the production of titanium dioxide by the sulfuric acid method.

[0028] Example 2:

[0029] Vanadium-titanium magnetite composition: Tfe57.5%, TiO 2 13.5%, V 2 O 5 0.59%. The particle size is below -100 mesh, using <1mm anthracite coal powder. The raw material ratio is: iron ore: coal powder: polyvinyl alcohol aqueous solution (concentration 3%) = 100:24:6. After mixing, it is pressed into a Ф25mm ball shape with a powder tableting machine, dried at 80°C for 1h, the water content of the pellet is less than 1%, and the dried ball is loaded into the rotary hearth furnace pan through a distributor with a thickness of 4 to 5 cm.

[0030] The rotary hearth furnace is heated with coal gas at a maximum temperature of 1350℃. After 15 minutes, a metallized block with a metallization rate of >90% is obtained. The block enters the electric furnace at about 1200°C. The temperature of the electric furnace is controlled at 1550-1650°C and melted quickly. Vanadium-containing molten iron and titanium slag with black titanium stone as the main titanium-containing phase, titanium slag and vanadium-containing molten iron are periodically discharged into the molten iron ladle and slag pot respectively. The main component of the vanadium-containing molten iron is: carbon [C] 3.7% , Vanadium [V] 0.48%, silicon [Si] 0.30%, titanium [Ti] 0.16%, vanadium-containing molten iron is blown to obtain vanadium pentoxide (V 2 O 5 ) 17.5% vanadium slag, electric furnace smelted to obtain about 58% titanium slag, the titanium slag is finely ground to below 20 microns, and the black titanium stone is phase separated by flotation to obtain titanium dioxide-containing TiO 2 The black titanite titanium-rich material with a content of 89% can be used as the raw material for the chloride method titanium white.

[0031] Example 3:

[0032] Vanadium titanium magnetite composition: Tfe54.5%, TiO 2 11.8%, V 2 O 5 0.55%. The particle size is below -100 mesh, using <1mm anthracite coal powder, and the raw material ratio is: iron ore: coal powder: carboxymethyl cellulose aqueous solution (concentration 2%) = 100:24:7. After mixing, press the powder tablet machine into 35×25×25mm block shape, natural curing and drying in the air for 12h, the pellet water content is less than 1%, the drying ball is put into the rotary hearth furnace pan through the cloth machine. The thickness is 4~5cm.

[0033] The rotary hearth furnace is heated with coal gas at a maximum temperature of 1370℃. After 15 minutes, a metallized block with a metallization rate of >90% is obtained. The block enters the electric furnace at about 1200℃, and the temperature of the electric furnace is controlled at 1550~1600℃. The vanadium-containing molten iron and the titanium slag with black titanium stone as the main titanium-containing phase, the titanium slag and the vanadium-containing molten iron are periodically discharged into the molten iron ladle and the slag pot respectively. The main components of the vanadium-containing molten iron are: [C]4.0%, [V] 0.40%, [Si] 0.20%, [Ti] 0.16%, vanadium-containing molten iron is blown to obtain vanadium pentoxide (V 2 O 5 ) 17.0% vanadium slag, after the electric furnace is melted, the titanium slag containing about 52% is obtained. The titanium slag is melted in the electric furnace, and oxygen is blown to oxidize the titanium to the rutile phase, and then finely ground to less than 20 microns. The rutile phase is separated to obtain titanium dioxide TiO 2 The rutile titanium-rich material whose content can reach 85% can be used as the raw material of chlorinated titanium dioxide.