Method for preparing lanthanum aluminate/lanthanum chromate by spraying pyrolysis

A technology of spray pyrolysis and lanthanum aluminate, which is applied in the field of materials to achieve the effect of avoiding high reaction temperature, reducing reaction temperature and time, and large contact area

Active Publication Date: 2015-09-02
NORTHEASTERN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0009] Aiming at the above-mentioned problems existing in the existing lanthanum aluminate and lanthanum chromate preparation technologies, the present invention provides a method for preparing lanthanum aluminate/lanthanum chromate by spray pyr...

Method used

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  • Method for preparing lanthanum aluminate/lanthanum chromate by spraying pyrolysis
  • Method for preparing lanthanum aluminate/lanthanum chromate by spraying pyrolysis
  • Method for preparing lanthanum aluminate/lanthanum chromate by spraying pyrolysis

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0061] Dissolve lanthanum chloride and aluminum chloride in water to make a solution, the concentration of lanthanum chloride in the solution is 350g / L, and the molar ratio of lanthanum to aluminum in the solution is 1:1;

[0062] Using air as the carrier gas, the solution is sprayed into the roasting furnace for spray pyrolysis through a compressor spray. The air flow rate during the spraying process is 5 L / h, and the flow ratio of air to solution is 50:1; The temperature is 500℃ and the time is 60s to obtain the torrefaction; the lanthanum oxychloride and aluminum oxide in the torrefaction are in the form of microcrystalline solid solution; the material after spray pyrolysis enters the cyclone separation device, and the separated solid is the torrefaction Slag and gas enter the tail gas absorption tower;

[0063] The slag is calcined at 900℃ for 1.5h to obtain lanthanum aluminate with a particle size of 0.2~100μm, a median diameter of 22.77μm, and LaAlO in weight percentage 3 99...

Embodiment 2

[0066] The method is the same as in Example 1, the difference is:

[0067] (1) The concentration of lanthanum chloride in the solution is 10g / L;

[0068] (2) During the blowing process, the air flow rate is 8000 L / h, and the flow ratio of air to solution is 70:1; the temperature of the roaster is 1700°C, and the time is 1s;

[0069] (3) The slag is calcined at 800℃ for 2h to obtain lanthanum aluminate with a particle size of 0.2-100μm, a median diameter of 18.45μm, and LaAlO in weight percentage 3 99.22%, the rest is LaOCl and Al 2 O 3 Impurities

[0070] Scanning electron microscopy results such as Figure 4 As shown, the XRD diffraction results are as Figure 5 As shown, the particle size analysis results are as Image 6 Shown.

Embodiment 3

[0072] The method is the same as in Example 1, the difference is:

[0073] (1) The concentration of lanthanum chloride in the solution is 100g / L;

[0074] (2) During the blowing process, the air flow rate is 800L / h, and the flow ratio of air to solution is 40:1; the temperature of the roaster is 800℃, and the time is 35s;

[0075] (3) The slag is calcined at 850°C for 2.5 hours to obtain lanthanum aluminate with a particle size of 0.2-100μm, a median diameter of 10.09μm, and LaAlO in weight percentage 3 99.50%;

[0076] Scanning electron microscopy results such as Figure 7 As shown, the XRD diffraction results are as Figure 8 As shown, the particle size analysis results are as Picture 9 Shown.

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Abstract

The invention discloses a method for preparing lanthanum aluminate/lanthanum chromate by spraying pyrolysis and belongs to the technical field of materials. The method comprises the following steps: (1) dissolving lanthanum chloride and aluminium chloride or chromium chloride to prepare solution; (2) adopting air as carrier gas, spraying the solution into a roasting furnace to carry out spraying pyrolysis and obtaining roasting slag; (3) calcining the roasting slag to obtain the lanthanum aluminate or the lanthanum chromate. The method disclosed by the invention has the advantages that the reaction temperature and the reaction time for producing the lanthanum aluminate are reduced; and proved by analysis results of X-ray diffraction of a product secondarily roasted, the crystal form of the product is an inclined and square hexahedron, so that the defects such as high reaction temperature of a solid-phase synthesis method and non-uniform particle size and distribution and irregular shape of the product are effectively avoided.

Description

Technical field [0001] The invention belongs to the technical field of materials, and particularly relates to a method for preparing lanthanum aluminate / lanthanum chromate by spray pyrolysis. Background technique [0002] LaA1O 3 It has the characteristics of small dielectric constant, low dielectric loss, good lattice matching, small thermal expansion coefficient, good chemical stability, wide energy gap, large specific surface area, certain activity and good thermal stability. It is used in electronic devices, catalysis , High-temperature fuel cells, ceramics, sewage treatment, substrate materials, etc. have been widely used. [0003] LaA1O 3 Applied to the gate dielectric material of next-generation metal oxide semiconductor field effect transistor devices, it can produce smaller and faster chips. Lanthanum aluminate is expected to become an ideal substitute for SiO in future very large-scale integrated circuits. 2 . [0004] LaCrO 3 It was first used as an electrode material for...

Claims

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Application Information

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IPC IPC(8): C01F17/00C01G37/14
Inventor 吴文远边雪王振峰
Owner NORTHEASTERN UNIV
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