In order to improve the leaching rate of vanadium in the existing sodium roasting of vanadium slag process, strong alkali leaching of roasted clinker and roasting mixed vanadium chemical solid waste (desiliconized slag, ferric vanadate and secondary slag) under a small quantity of alkalis was carried out. The results showed that vanadium-bearing mineral is maily wrapped by phases hematite (Fe2O3), pseudobrookite (Fe2TiO5) and acmite [NaFe(SiO3)2]. When the concentration of NaOH was 10 g/L in strong alkali leaching of roasted clinker process, the leaching rate of vanadium is higher, up to 83.15%, and the filter efficiency increased by 12%. High efficiency leaching of vanadium can be achieved by adding NaOH or Na2CO3 to the mixture of desiliconized slag and secondary slag and roasting, vanadium content in tailings is only 0.57%. Roasting mixed slag with mixed alkali (Na2CO3 and NaOH composite additives) was employed. When the dosage of ferric vanadate is less than 8%, high efficiency leaching of vanadium can be achieved by adding Na2CO3 to the mixture of ferric vanadate slag and secondary slag and roasting, vanadium content in tailings is only 0.68%.
Litang GENG Lanjie LI Beibei ZHAO Ruiguo BAI
. High Efficiency Leaching of Vanadium in Vanadium Chemical Process[J]. The Chinese Journal of Process Engineering, 2017
, 17(4)
: 744
-750
.
DOI: 10.12034/j.issn.1009-606X.216353
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