RE: Sodium Carbonate26 Sep 2023 07:59
every vanadium ore (and **** in future) is different and the reactions in the kiln are complex with many side reactions. vametco ore does not need carbonate in the flux, but evidently the new 3rd party ore at vanchem does because of the higher silicate content.
here are the full set of reactions, just for you coffeecups, as i know how much you like your detail:-
4/5fev2o4 + 4/5na2co3 + o2→ 8/5navo3 + 2/5fe2o3 + 4/5co2 which has a gibbs free energy, Δg(t) = −345.3 – 0.04t (kj/mol o2)
then there is also 4/5fev2o4 + 8/5na2co3 + o2→ 4/5na4v2o7 + 2/5fe2o3 + 8/5co2 with a free energy of −306.70 – 0.07t (kj/mol o2)
also 4/7fecr2o4 + 8/7na2co3 + o2→ 8/7na2cro4 + 2/7fe2o3 + 8/7co2 where Δg(t) = −94.64 – 0.04t (kj/mol o2)
and not forgetting, if there is chromium impurity in the ore or **** there is 2/3mgcr2o4 + 4/3na2co3 + o2→ 4/3na2cro4 + 2/3mgo + 4/3co2