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Method for preparing lanthanum aluminate powder efficiently

A technology of lanthanum aluminate and powder is applied in the field of efficient preparation of lanthanum aluminate powder, which can solve the problems of large raw material particle size, reduced material particle size, long synthesis time, etc. Effect

Inactive Publication Date: 2014-09-03
INNER MONGOLIA UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] LaAlO synthesized from lanthanum oxide and aluminum oxide in solid phase at high temperature 3 The characteristics of the powder method are: short process and environment-friendly, but the particle size of the raw material is large (micron level), and the contact area of ​​the solid material is small, resulting in problems such as high synthesis temperature, long synthesis time, and incomplete synthesis.
[0007] The characteristics of the uniform precipitation method are: the particle size of the material is reduced (nano-scale) by co-precipitation, the contact area of ​​the solid material is increased, the synthesis temperature is low, but the material is difficult to filter and wash, and waste water harmful to the environment is produced

Method used

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  • Method for preparing lanthanum aluminate powder efficiently

Examples

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Comparison scheme
Effect test

Embodiment 1

[0023] Example 1. Lanthanum oxide and aluminum hydroxide were used as initial raw materials. The purity of lanthanum oxide was 99.9% (mass percentage), and aluminum hydroxide was an analytically pure chemical reagent (including 33.0% moisture). Weigh 32.60g-0.10mol of lanthanum oxide on a balance, add 200g of water, and hydrothermally heat it in a constant temperature water bath at 100°C for 2.0 hours. The lanthanum oxide is converted to La(OH) by hydrothermal method. 3 . The balance weighs 23.28 g of aluminum hydroxide (including Al(OH) 3 0.20mol), La(OH) 3 And Al(OH) 3 Mix with water as a medium and stir for 2 minutes, then filter. The filtered mixture is calcined at a high temperature of 1100°C for 2.0 hours.

Embodiment 2

[0024] Example 2. Lanthanum oxide and aluminum hydroxide were used as initial raw materials. The purity of lanthanum oxide was 99.9% (mass percentage), and aluminum hydroxide was an analytically pure chemical reagent (including 33.0% moisture). Weigh 48.90g-0.15mol lanthanum oxide with a balance, add 300g of water, and hydrothermally heat it in a constant temperature water bath at 100°C for 3 hours. The lanthanum oxide is converted to La(OH) by hydrothermal method. 3 . The balance weighs 34.93 g of aluminum hydroxide (including Al(OH) 3 0.30mol), La(OH) 3 And Al(OH) 3 Use water as the medium to mix and stir for 3 minutes, then filter. The filtered mixture is calcined at a high temperature of 1100°C for 2.5 hours.

Embodiment 3

[0025] Example 3. Lanthanum oxide and aluminum hydroxide were used as initial raw materials. The purity of lanthanum oxide was 99.9% (mass percentage), and aluminum hydroxide was an analytically pure chemical reagent (including 33.0% moisture). Weigh 65.20g-0.20mol of lanthanum oxide with a balance, add 350g of water, and hydrothermally heat it in a constant temperature water bath at 95°C for 4.0 hours. The lanthanum oxide is converted to La(OH) by hydrothermal method. 3 . The balance weighs 46.57 g of aluminum hydroxide (including Al(OH) 3 0.40mol), La(OH) 3 And Al(OH) 3 Mix with water as a medium and stir for 4 minutes, then filter. The filtered mixture is calcined at a high temperature of 1150°C for 2.5 hours.

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Abstract

The invention relates to a method for preparing lanthanum aluminate powder efficiently. The method comprises the following steps: (1) adding water into lanthanum oxide, wherein the mass of the added water is 1-20 times more than that of the lanthanum oxide, stirring, controlling the material temperature to be 30-250 DEG C and keeping warm for 1-8 hours, thus obtaining lanthanum hydroxide by the hydrothermal method; (2) adding aluminum hydroxide into a system of lanthanum hydroxide obtained by the hydrothermal method and water, wherein the mole ratio of the aluminum hydroxide to the lanthanum oxide is 2:1, using the water as medium, fully mixing the aluminum hydroxide with the lanthanum hydroxide by stirring, and filtering after stirring for 1-10 minutes; and (3) keeping the mixture of the aluminum hydroxide and the lanthanum hydroxide at the temperature of 1000-1400 DEG C for 1-5 hours, and thereby obtaining the lanthanum aluminate powder. The method for preparing lanthanum aluminate powder efficiently has the advantages that (a) the preparation technology is environment-friendly; and (b) the preparation efficiency is high. The aluminum hydroxide and the lanthanum hydroxide are fully mixed and the mixture is easy to filter, the calcination temperature is low, and the combining time is short. The method for preparing lanthanum aluminate powder efficiently is suitable for preparing lanthanum aluminate powder in large scales.

Description

Technical field [0001] The invention relates to a method for efficiently preparing lanthanum aluminate powder, and belongs to the field of rare earth refractory material preparation. technical background [0002] Lanthanum aluminate (LaAlO 3 ) ABO with perovskite structure 3 The compound has good microwave dielectric properties and is widely used as a key material for microwave devices such as filters and resonators. At the same time, LaAlO 3 It has good lattice matching and close thermal expansion coefficient with high-temperature superconducting and BST ferroelectric thin films, so it is also widely used as the substrate material of superconducting thin films for microwave devices. LaAlO 3 The powder also has high contact reaction activity, so it is also used as a catalyst for the oxidative coupling of methane and the hydrogenation and hydrogenolysis of hydrocarbons. LaAlO 3 It has high thermal stability and chemical stability. As a high-quality refractory or crucible material,...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01F17/00B82Y30/00
Inventor 姜银举樊珍
Owner INNER MONGOLIA UNIV OF SCI & TECH
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