Aeris oxidatio modum est oxidatio modum utilitas oxygeni in aere oxidizeceriumut tetravalent in quibusdam conditionibus. This method typically involves roasting fluorocarbon cerium ore concentrate, rare earth oxalates, and carbonates in air (known as roasting oxidation) or roasting rare earth hydroxides (dry air oxidation) or introducing air into rare earth hydroxides slurry (wet air oxidation) for oxidation.
I, torrentes oxidatio
Poasting fluorocarbon cerium intendi in aere ad D ℃ vel torrendum Baiyunebo rara terra intendi cum sodium carbonate in aere ad 600-700 ℃. Per corrumpuntur rara terris mineralia, cerium in mineralibus est oxidized ad tetravalent. Et modi ad separandumceriumEx Calcium products includit rara terra sulfate duplex sal modum, solvendo extractionem modum, etc.
In addition ad oxidatio torrendorara terraIncumbo, sales ut rara terra oxalate et rara terra carbonate subeunto tormenta corrumpuntur in aere atmosphaera, et cerium est oxidized ad Ceo2. Ad curare bonum solubility rara terra cadmiae mixtisque adeptus tormentis, in tormentandi temperatus non esse altum, plerumque inter DCC et DCCC ℃. Oxides potest dissolvi in 1-1.5Mol / l Sulphuric acidum solutio vel 4-5Mol / l nitric acidum solution. Cum leaching assum ore cum sulphuric acidum et nitric acidum, cerium maxime intrat solution in tetravalent forma. Illud involves obtinendae rara terra sulfate solution continet 50g / l Reo in circuitu XLV ℃ et producendo cerium dioxide usura p204 extraction modum; Quod haec involves parat rara terra nitrate solutio continentur REO ex 150-200g / l ad temperatus de 80-85 ℃ et usura tbp extraction ut separate cerium.
Cum rara terram oxides sunt dissolvi cum diluto sulphuric acidum aut nitric acidum, CEO2 est relative insolubilis. Ideo parva moles hydrofluoric acidum necessitates ad additum ad solutionem ut catalyst in postea scaena dissolutionis ad amplio solubility CEO2.
II, siccum aer oxidatio
Ponere rara terra hydroxide in siccitate fornacem et oxidize eam in ventilari conditiones ad 100-120 ℃ ad 16-24 horas. Oxidatio reactionem est ut sequitur:
4ce (O) III + O2 + 2H2O = 4ce (O) IV
In oxidatio rate of cerium potest pervenire XCVII%. Si oxidatio temperatus est longius ad CXL ℃, in oxidatio tempus potest breviabuntur 4-6 horis et oxidatio rate of cerium potest etiam pervenire XCVII% ~ XCVIII%. Et arida aer oxidatio processus producit magna moles pulveris et pauper labore conditionibus, quae sunt currently maxime in officinarum.
III, atmosphaerica infectum caeli oxidatio
Miscere rara terra hydroxide cum aqua ad formare slurry, control in reo ad 50-70g / l, addere Naoh ad augendam alkalinity in slurrize ad 0.15-30Mol in slurry ad oxidize omnes trivalent Cerium in slurry in cerium. Per oxidatio processus, evaporationem aquae relative magna, ita quaedam copia aquae supplescitur aliquando ponere magis firmum concentration rara terra. Cum 40l de slurry est oxidized in se batch, in oxidationis tempus est 4-5 horas et oxidatio rate of cerium potest pervenire XCVIII%. Cum 8m3 de rara terra hydroxide slurry est oxidized per tempus, in aere fluunt rate est 8-12m3 / min et oxidatio tempus augetur ad 15h% XCVIII rate of Cerium potest pervenire XCVII% XCVIII%.
In characteres de atmosphaerica infectum aeris oxidatio modum sunt: excelsum oxidationis rate of cerium, magna output, bonum operantes conditionibus, simplex operatio, et hoc modo est communiter in industria producere cruda cerium dioxide.
IV, pressurized infectum caeli oxidatio
Sub normalis pressura, aere oxidatio accipit longior tempore, et populum breviare in oxidation tempus per usura pressura. The increase of air pressure, that is, the increase of oxygen partial pressure in the system, is conducive to the dissolution of oxygen in the solution and the diffusion of oxygen to the surface diffusion of rare earth hydroxide particles, thus accelerating the oxidation process.
Miscere rara terra hydroxide cum aqua ad de 60g / l, adjust in PH ad XIII cum sodium hydroxide, levare temperatus ad LXXX ℃, ad 0.4mpa et imperium in I hora. In oxidatio rate of cerium potest pervenire super XCV%. In ipsa productio, oxidatio rudis materia rara terra hydroxide est adeptus ab alkali conversionem per praecipitatio rara terra sodium sulfate complexu sal. Ut brevior processus, praecipitatio rara terra sodium sulfate complexu sal et alkaline solutio potest addidit ad pressurized oxidatio tristique, maintaining quaedam pressurized et temperatus. Aeris et dives oxygeni potest introduci ad converterit rara terra in universa sal in rara terra hydroxides et simul CE (o) III in ea potest oxidized ad CE (o) IV.
Sub pressurized conditionibus, in alkali conversionem rate of complexu sal, oxidatio rate of cerium et oxidatio rate of cerium sunt omnes melius. Post XLV minutes reactionem, conversionem rate of duplex sal alkali et oxidatio rate of cerium pervenit super XCVI%.
Post tempus: May-09-2023