Preparation method of rare earth perovskite type composite oxides

[0046] A kind of preparation method of rare earth perovskite type composite oxide is carried out according to the following steps:

[0047] (1) According to the chemical composition of the perovskite composite oxide, the metal element chloride is mixed according to the stoichiometric ratio La:Mn:Al=3:2:1, dissolved in water and then added with n (metal ion):n( organic compound)=1:0.5 sucrose, obtaining mass concentration is the chloride mixed solution raw material of 10g / L;

[0048] (2) Air is used as the carrier gas, the carrier gas flow rate is 4L / h, the chloride mixed solution is atomized through the nozzle to form mist, and the mist is sprayed from the bottom or above the pyrolysis furnace, the pyrolysis temperature is 400 ° C, and the heat The solution time is 20s. After the pyrolysis is completed, a separator is used for gas-solid separation, and the generated gas is recovered into hydrochloric acid through the tail gas absorption tower to obtain a solid mixture;

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[0051] A kind of preparation method of rare earth perovskite type composite oxide is carried out according to the following steps:

[0052] (1) According to the chemical composition of the perovskite composite oxide, the metal element chloride is mixed according to the stoichiometric ratio Pr:Mn:Fe=5:2:3, dissolved in water and then added with n (metal ion):n( Organic compound)=1:0.1 sucrose, obtaining mass concentration is the chloride mixed solution raw material of 360g / L;

[0053] (2) Air is used as the carrier gas, and the carrier gas flow rate is 12000L / h. The chloride mixed solution is atomized through the nozzle to form droplets. The droplets are sprayed from the bottom or above the pyrolysis furnace. The pyrolysis temperature is 1000°C. The time is 1s. After the pyrolysis is completed, a separator is used for gas-solid separation, and the generated gas is recovered into hydrochloric acid through the tail gas absorption tower to obtain a solid mixture;

[0054] (3) Ro

[0056] A kind of preparation method of rare earth perovskite type composite oxide is carried out according to the following steps:

[0057] (1) According to the chemical composition of the perovskite composite oxide, the metal element chloride is mixed according to the stoichiometric ratio Ce:Mn:Co=2:1:1, dissolved in water and then added with n (metal ion):n( Organic compound)=1:1.5 citric acid, obtaining mass concentration is the chloride mixed solution raw material of 180g / L;

[0058] (2) Air is used as the carrier gas, the carrier gas flow rate is 9000L / h, the chloride mixed solution is atomized through the nozzle to form mist, and the mist is sprayed from the bottom or above the pyrolysis furnace, the pyrolysis temperature is 700°C, The solution time is 5s. After the pyrolysis is completed, a separator is used for gas-solid separation, and the generated gas is recovered into hydrochloric acid through the tail gas absorption tower to obtain a solid mixture;

[0059] (3)