60 Ferro Vanadium

Ferro vanadium 60 is an alloy obtained through reduction, with a vanadium content of not less than 35.0% and not more than 85.0%. The vanadium containing iron concentrate obtained from the beneficiation of vanadium titanium magnetite ore is sent to the sintering and ironmaking processes to obtain vanadium containing molten iron. The vanadium containing molten iron is then extracted by the converter to obtain vanadium slag, with a vanadium recovery rate of 46.28%. If the comprehensive utilization of steel slag and other factors is considered, the actual vanadium recovery rate is slightly higher than this, reaching over 53%. Vanadium slag undergoes processes such as roasting, leaching, and vanadium precipitation to obtain ammonium polyvanadate. Ammonium polyvanadate undergoes processes such as roasting and reduction to obtain V2O5 or V2O3, which is further reduced by the electro aluminothermal method to produce ferrovanadium.

Production process and equipment for silicon thermal smelting of ferrovanadium:

The raw materials used in the silicon thermal method are as follows:

V2O5: Thickness not exceeding 5mm, block size not exceeding 200mm; Ferrosilicon: usually 75% ferrosilicon with a block size of 20-30mm is used;

Lime: should be well calcined, with effective CaO>85%, P<0.15%, and a block size of 30-50mm;

Aluminum block: 30-40mm block size;

Scrap steel: Waste carbon steel or scrap steel magnetically selected from vanadium slag should be clean and rust free. Scrap steel or other high-quality steel materials can also be used, but these materials are required to contain C ≤ 0.5% and P ≤ 0.035%.

Production process flow:

The technology of smelting ferrovanadium using electric silicon thermal method is very mature, and smelting is carried out in an electric arc furnace;
The reduction period is divided into reduction period and refining period. The reduction period is further divided into second stage smelting and third stage smelting methods. Excess silicon iron is used to reduce the refined slag on the furnace until the slag contains less than 0.35% V2O5. The waste slag is discharged from the furnace to start refining, and then a mixture of vanadium pentoxide and lime is added for refining.
When the Si content in the alloy is less than 2%, the refined slag discharged contains 10%~15% V2O5 and is returned to the next furnace for use.

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