| 摘要 |
<p>PURPOSE:To recover valuable vanadium in a high yield, by adding a slag forming agent with an alkali metal carbonate base to pig iron after removal of slag from the pig iron due to the desiliconization and dephosphorization treatments of it and by recovering vanadium from the formed slag. CONSTITUTION:The slag obtained by the secondarty dephosphorization treatment of pig iron after the desiliconization and primary dephosphorization treatments, is cooled to solidify and then crushed into lumps. The lamps are eluted with hot water. After removal of the residue such SiO2 and Fe, Fe ions such as ferric sulfate are added to the extrate to remove S as FeS and then the extrate is further concentrated to remove Na2CO3 as crystal. Subsequently, a Ca compound such as CaO is added to the extrate to separate P as Ca3(PO4)2 and hen an ammonium compound such as (NH4)2SO4 is added to the extrate to precipitate NH4VO3, which is heated and decomposed to form V2O5. The V2O5 is reduced by Al and pure vanadium is recovered.</p> |
