| 摘要 |
The invention relates to processes for metal extraction from waste, in particular to vanadium extraction from waste resulted from fuel oil burning. The process includes extraction of vanadium in the form of NaVO3 by waste leaching at heating with a NaOH solution in the presence of oxidant, decantation of the NaVO3 extract from the insoluble residue, repeated washing of the residue, with subsequent filtration of the combined NaVO3 extract and treatment thereof with ammonium inorganic salts, for example NH4Cl, NH4NO3 or (NH4)2SO4 for vanadium sedimentation in the form of NH4VO3, separation of the sediment, washing, dying and calcination with V2O5 obtaining. At the same time, as oxidant is used (NH4)2S2O8 or Na2O2 in NaOH solution with the concentration of 500 g/dm3, in the molar ratio oxidant:NaOH of (1à2):10. The leaching is carried out at the temperature of 100à120?C, during 20 minutes, the ratio solution:residue being of 10:(6à6,5).
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