Method for recovering ferrum, vanadium, chromium and gallium from vanadium extraction tailings

[0028] Example 1 adopts the inventive method to reclaim iron, vanadium, chromium and gallium from vanadium extraction tailings

[0029] Mix vanadium extraction tailings, coal powder, calcium oxide, and binder uniformly in a weight ratio of 100:15:15:2, the particle size of vanadium extraction tailings is -60 mesh, accounting for 86.2%, and the particle size of coal powder is -60 mesh Accounting for 84.2%, the binder is polyvinyl alcohol (PVA). The mixture is pressed into an ellipsoidal green pellet on a powder molding machine, and the maximum radial dimension of the pellet is 15mm. The green pellets were reduced in a rotary hearth furnace with an alkalinity of 1.2, a reduction temperature of 1000°C, and a reduction time of 30 minutes under a CO atmosphere to obtain metallized pellets; the metallized pellets were melted and heated in an electric arc furnace. Deep reduction, the melting temperature is 1450°C, and the melting time is 25 minutes to obtain pig iron and slag containin

[0030] Example 2 adopts the inventive method to reclaim iron, vanadium, chromium and gallium from vanadium extraction tailings

[0031] The vanadium extraction tailings, coal powder, calcium oxide, and binder are uniformly mixed in a weight ratio of 100:12:17:3, the particle size of the vanadium extraction tailings is -60 mesh, accounting for 86.2%, and the particle size of the coal powder is -60 mesh Accounting for 84.2%, the binder is polyvinyl alcohol (PVA). The mixture is pressed into an ellipsoidal green pellet on a powder molding machine, and the maximum radial dimension of the pellet is 20mm. The raw pellets were reduced in a straight-hearth furnace with an alkalinity of 1.1, under a CO atmosphere, a reduction temperature of 1050°C, and a reduction time of 25 minutes to obtain metallized pellets; the metallized pellets were smelted in a submerged arc furnace And deep reduction, the smelting temperature is 1500°C, and the smelting time is 40 minutes, to obtain pig iron and

[0032] Example 3 adopts the inventive method to reclaim iron, vanadium, chromium and gallium from vanadium extraction tailings

[0033] The vanadium extraction tailings, coal powder, calcium oxide, and binder are uniformly mixed in a weight ratio of 100:25:15:2, the particle size of the vanadium extraction tailings is -60 mesh, accounting for 86.2%, and the particle size of the coal powder is -60 mesh Accounting for 84.2%, the binder is carboxymethyl cellulose (CMC). The mixture is pressed into pillow-shaped green pellets on a powder molding machine, and the maximum radial dimension of the pellets is 35 mm. The raw pellets were reduced in a straight-hearth furnace with an alkalinity of 1.3, a reduction temperature of 1150°C, and a reduction time of 25 minutes under a CO atmosphere to obtain metallized pellets; the metallized pellets were melted and heated in an electric arc furnace. Deep reduction, the melting temperature is 1600°C, and the melting time is 30 minutes to obtain p