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Preparation method of rare earth perovskite type composite oxides

A composite oxide, rare earth calcium technology, applied in chemical instruments and methods, cobalt compounds, manganese compounds, etc.

Inactive Publication Date: 2018-11-06
INNER MONGOLIA UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] For existing REB 1-x C x o 3 or RE 1-x B x CO 3 Problems in the preparation technology of perovskite composite oxides, the present invention provides a preparation method of rare earth perovskite composite oxides, by controlling the concentration of the chloride solution and the stoichiometric ratio of each component, the reaction temperature and the gas The flow rate is based on the rare earth chloride produced by the rare earth industrial production line as the raw material, and the REB with high purity can be produced without pollution. 1-x C x o 3 or RE 1-x B x CO 3 perovskite composite oxide

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[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;

[004...

Embodiment 2

[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) Roa...

Embodiment 3

[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) R...

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Abstract

The invention discloses a preparation method of rare earth perovskite type composite oxides, and belongs to the technical field of perovskite materials. The preparation method comprises following steps: (1) mixing metal chlorides according to a certain stoichiometric mole ratio, dissolving metal chlorides into water, and adding organic compounds to obtain a mixed solution of chlorides; (2) atomizing the chloride mixed solution by a nozzle to form droplets, spraying the mixed solution from the bottom of a pyrolysis furnace or above a pyrolysis furnace, and carrying out solid-liquid separation to obtain a mixture solid; and (3) burning the mixture solid to obtain rare earth perovskite type nano powder. Rare earth chlorides are taken as the raw materials, by controlling the conditions of reactions of the chloride solution in a pyrolysis furnace, high purity rare earth perovskite type composite oxides can be synthesized at a low temperature, and the raw material cost and energy consumptionare reduced.

Description

technical field [0001] The invention belongs to the technical field of perovskite materials, in particular to a preparation method of rare earth perovskite type composite oxides. technical background [0002] REB 1-x C x o 3 or RE 1-x B x CO 3 The synthesis of perovskite-type composite oxides mostly adopts coprecipitation method, alkoxide hydrolysis method, hydrothermal synthesis method and sol-gel method, etc. In recent years, spray pyrolysis method has a small particle size and large specific surface area It is widely used in the field of functional materials because of the characteristics of uniform distribution of components, etc., and the synthesis of oxides and composite oxides through metal chloride spray pyrolysis can solve the problems of complex preparation process, long time and large amount of waste water in the traditional preparation process. [0003] Aiming at the problems of wastewater polluting the environment and soil salinization in the production pr...

Claims

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Application Information

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IPC IPC(8): C01G45/00C01G49/00C01G51/00B82Y40/00
CPCB82Y40/00C01G45/006C01G49/009C01G51/006C01P2002/34
Inventor 王振峰伍永福迟茂强龚志军
Owner INNER MONGOLIA UNIV OF SCI & TECH
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