Preparation method of porous mullite-corundum perovskite loaded La1-xKxCo0.7Fe0.3O3 material

A porous mullite and perovskite technology, used in ceramic products, applications, household appliances, etc., can solve the problems of reducing the mechanical strength of ceramic products, easy cracking of ceramic frames, and difficult to control air bubbles, to overcome the hole size and development. It is difficult to control the amount of foam, the coefficient of thermal expansion is small, and it is easy to build a factory for production.

Inactive Publication Date: 2016-11-23
NORTH CHINA UNIV OF WATER RESOURCES & ELECTRIC POWER
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Among them, the chemical method to prepare porous ceramic products reacts quickly, and the generated bubbles are not easy to control; the organic foam impregnation method has a simple process and is usually used to prepare porous ceramics with high porosity and through-pore structure. The heating rate must be very slow, and when the organic template is burned out, it is easy to produce slag, causing environmental pollution, and the ceramic frame is easy to crack, which will significantly reduce the mechanical strength of the final ceramic product; while the foaming method has the advantages of producing tiny bubbles and high porosity. , controllable hole shape and size, low production cost and simple process, etc.

Method used

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  • Preparation method of porous mullite-corundum perovskite loaded La1-xKxCo0.7Fe0.3O3 material
  • Preparation method of porous mullite-corundum perovskite loaded La1-xKxCo0.7Fe0.3O3 material
  • Preparation method of porous mullite-corundum perovskite loaded La1-xKxCo0.7Fe0.3O3 material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] A porous mullite-corundum supported perovskite La 1-x K x co 0.7 Fe 0.3 o 3 (x=0.2) The preparation method of material, comprises the following steps:

[0019] 1) Preparation of porous mullite-corundum material: Weigh 320 grams of bauxite (2.825 moles of Al 2 o 3 ) and 80 g of diatomaceous earth (1.132 mol SiO 2 ) into the mill for continuous wet grinding for 12 hours, filter the slurry to obtain a filter cake, dry the filter cake in an oven at 110°C and grind to obtain a mixed powder, put the mixed powder in a container and add water (the amount of water and powder The weight ratio is 1.2:1) Stir for 30min, then add 20g starch, 2.0g triammonium citrate, 0.4g sodium carboxymethylcellulose and 0.6g silicone polyether emulsion (solid content 55wt%), stir well before adding 4g of sodium lauryl sulfate, stirred for 6 minutes to obtain a uniform and stable foam slurry and then injection molded, then placed the formed foam slurry in an oven at 40°C for 60 minutes, and...

Embodiment 2

[0022] A porous mullite-corundum supported perovskite La 1-x K x co 0.7 Fe 0.3 o 3 (x=0.8) The preparation method of material, comprises the following steps:

[0023]1) Preparation of porous mullite-corundum material: Weigh 332 grams of bauxite (2.930 moles of Al 2 o 3 ) and 69 g of diatomaceous earth (0.976 mol SiO 2 ) into the mill for continuous wet grinding for 6 hours, filter the slurry to obtain a filter cake, dry the filter cake in an oven at 110°C and grind to obtain a mixed powder, put the mixed powder in a container and add water (the amount of water and powder The weight ratio is 1.2:1) and stir for 10min, then add 20g starch, 2.0g triammonium citrate, 0.2g sodium carboxymethylcellulose and 0.8g silicone polyether emulsion (solid content 55wt%), stir well and add 4.0 g sodium lauryl sulfate, stirred for 4 minutes to obtain a uniform and stable foam slurry, then injection molded, then placed the formed foam slurry in an oven at 70 ° C for 10 minutes, demolded...

Embodiment 3

[0026] A porous mullite-corundum supported perovskite La 1-x K x co 0.7 Fe 0.3 o 3 (x=0.4) The preparation method of material, comprises the following steps:

[0027] 1) Preparation of porous mullite-corundum material: take 259 grams of bauxite (2.286 moles of Al 2 o 3 ) and 40.5 g of diatomaceous earth (0.573 mol of SiO 2 ) into the mill for continuous wet grinding for 11 hours, filter the slurry to obtain a filter cake, dry the filter cake in an oven at 110°C and grind to obtain a mixed powder, put the mixed powder in a container and add water (water and powder The weight ratio is 1.3:1) and stir for 30min, then add 15g starch, 1.5g triammonium citrate, 0.6g sodium carboxymethylcellulose and 0.2g silicone resin polyether emulsion (solid content 55wt%), stir well and then add 2.5 g sodium lauryl sulfate, stirred for 5 minutes to obtain a uniform and stable foam slurry, then injection molded, then placed the formed foam slurry in an oven at 40 ° C for 50 minutes, demol...

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Abstract

The invention relates to a preparation method of porous mullite-corundum perovskite loaded La1-xKxCo0.7Fe0.3O3 (x is equal to 0.2 to 0.8). The preparation method comprises the following steps: preparing a porous mullite-corundum material by taking bauxite and diatomite as raw materials through carrying out wet milling, filtering, drying and stirring, additionally adding a binding agent, a dispersant, a foam stabilizer and a foaming agent, and molding, drying and sintering; then loading perovskite on a porous mullite-corundum carrier by adopting a vacuum impregnation and calcining method to prepare a porous mullite-corundum perovskite loaded La1-xKxCo0.7Fe0.3O3 material. The preparation method has the characteristics of simple process, short production period, high efficiency, stable product quality, low cost and the like; the porous mullite-corundum perovskite loaded La1-xKxCo0.7Fe0.3O3 material can be produced and prepared according to requirements and the preparation method has a relatively good industrial utilization prospect.

Description

technical field [0001] The invention relates to a method for preparing a porous mullite-corundum material, in particular to a method for preparing porous mullite-corundum loaded perovskite La with bauxite and diatomite as raw materials. 1-x K x co 0.7 Fe 0.3 o 3 material method. Background technique [0002] Porous ceramics is an inorganic non-metallic material with many pores. It has excellent characteristics such as high porosity, high permeability, corrosion resistance, large specific surface area, low bulk density and low thermal conductivity. It is widely used in metallurgy, chemical industry Environmental protection, energy, food, pharmaceuticals, biology and other fields, used as materials for filtration, separation, air distribution, sound absorption, heat insulation, chemical fillers, bioceramics and catalyst carriers, etc. attention of researchers in the field. [0003] Currently, there are three main methods for preparing porous ceramics, including chemical ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B38/10C04B35/10C04B35/64
CPCC04B35/10C04B35/64C04B38/10C04B2235/3201C04B2235/3227C04B2235/3274C04B2235/3275C04B2235/3463C04B2235/616C04B2235/6562C04B2235/6567C04B2235/96C04B2235/9607C04B38/02
Inventor 杨中正孙红林张金矿李杰马凯张媞张帅兵
Owner NORTH CHINA UNIV OF WATER RESOURCES & ELECTRIC POWER
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