What Can ZhenAn Ferro Vanadium Be Smelted? What Should Be Paid Attention To?
Leave a message
What can ZhenAn ferrovanadium be smelted? What should be paid attention to?
Ferrovanadium is an iron-vanadium binary alloy with a vanadium mass fraction of 40% to 80%. The main impurity elements are carbon, silicon, aluminum, etc. Ferrovanadium is produced by reduction from calcium vanadate (CaO·V2O3) or iron vanadate (FeO·V2O3) slag by aluminothermic method and siliconthermic method, and its chemical composition is listed in Table 5-28. Since the raw material for producing ferrovanadium is ironmaking slag, ZhenAn ferrovanadium contains higher impurities such as carbon, silicon, aluminum, and phosphorus.
Ferrovanadium is mainly used for smelting alloy structural steel, spring steel, mold steel, high-speed tool steel, etc. The melting point of ferrovanadium increases with the increase of vanadium content. The melting point of ferrovanadium with a V mass fraction of 30% to 45% is about 1450-1600℃, and that of ferrovanadium with a V mass fraction of 80% to 85% is about 1680-1800℃. Therefore, the melting speed should be considered when selecting ferrovanadium. In the case of a small amount of ferrovanadium added, try to use low-vanadium grade ferrovanadium.
Ferrovanadium smelting method: electrosilicothermal method. Flake vanadium pentoxide uses 75% ferrosilicon and a small amount of aluminum as reducing agents. In an alkaline electric arc furnace, qualified products are obtained through two stages of reduction and refining. During the reduction period, all the reducing agents of a furnace and 60-70% of the flake vanadium pentoxide are loaded into the electric furnace, and silicon thermal reduction is carried out under high calcium oxide slag. When the V2O5 in the slag is less than 0.35%, the slag (called lean slag, which can be discarded or used as building materials) is released and the refining period begins. At this time, flake vanadium pentoxide and lime are added to remove excess silicon, aluminum, etc. in the alloy liquid. When the alloy composition meets the requirements, the slag and iron alloy can be discharged. The slag discharged in the later stage of refining is called rich slag (containing 8-12% V2O5), which is returned for use when the next furnace starts to add materials. The alloy liquid is generally cast into cylindrical ingots, which are finished products after cooling, demolding, crushing and slag cleaning. This method is generally used for smelting ferrovanadium containing 40-60% vanadium. The recovery rate of vanadium can reach 98%. The electricity consumption for refining each ton of ferrovanadium is about 1600 kWh.
The aluminothermic method uses aluminum as a reducing agent and adopts the bottom ignition method to smelt in the furnace drum with alkaline lining. First, a small part of the mixed charge is loaded into the reactor and ignited. After the reaction starts, the remaining charge is added in succession. It is usually used to smelt high vanadium iron (containing 60-80% vanadium), and the recovery rate is slightly lower than that of the electric silicon thermal method, about 90-95%.
In summary, when using high-vanadium grade ferrovanadium, attention should be paid to the size of the added pieces, baking temperature (about 400℃) and melting time, etc., to avoid the phenomenon of unmelting.
The above is the relevant content about ZhenAn ferrovanadium. For more details, please continue to browse the ZhenAn official website.
Address：Huafu Commercial Center, Wenfeng District, Anyang City, Henan Province, China
