Method for preparing beta-Al2O3 precursor powder by spray drying taking water as medium

A spray drying method and technology of precursor powder, which is applied in the field of preparing beta-Al2O3 precursor powder by spray drying, can solve the problems of high requirements on equipment sealing and complicated operation, and achieve good reactivity, uniform particle size distribution and fluidity. strong effect

Active Publication Date: 2010-12-01
上海电气企业发展有限公司
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The slurry spray drying process with alcohol as the medium must be carried out in a complet...

Method used

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  • Method for preparing beta-Al2O3 precursor powder by spray drying taking water as medium
  • Method for preparing beta-Al2O3 precursor powder by spray drying taking water as medium
  • Method for preparing beta-Al2O3 precursor powder by spray drying taking water as medium

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0015] Weigh a certain amount of α-Al 2 o 3 and Na 2 C 2 o 4 According to Na 2 O:Al 2 o 3 =1:7.6 ratio mixing ball mill, with deionized water as the ball milling medium, the mass ratio of solid raw material and deionized water is 1:1. After 4 hours of ball milling, the obtained slurry is spray-dried. The hot air inlet temperature of the spray drying equipment is 230°C, the outlet temperature is 120°C, the rotation speed of the atomizing disc is 10000r / min, and the feeding rate is automatically controlled according to the temperature. Material 8kg. The obtained raw material powder particles have good sphericity and strong fluidity, the volume average particle size is about 26.1μm, and the specific surface area is 2.25m 2 / g. After the spray-dried powder is packaged, it is calcined at 1250°C for 2 hours to obtain the Na precursor powder. The Na precursor powder synthesized at high temperature still has good sphericity, light agglomeration, and can retain high sinte...

Embodiment 2

[0017] Weigh a certain amount of α-Al 2 o 3 and NaOH according to Na 2 O:Al 2 o 3 =1:7.5 ratio mixed ball mill, with deionized water as the ball milling medium, the mass ratio of solid raw material and deionized water is 1:1. After ball milling for 6 hours, spray dry the obtained slurry. The hot air inlet temperature of the spray drying equipment is 230°C, the outlet temperature is 120°C, the rotation speed of the atomizing disc is 10000r / min, and the feeding rate is automatically controlled according to the temperature. Material 7.5kg. Due to the high solubility of NaOH in water, the viscosity of the slurry prepared with NaOH as the Na source is lower than that of the slurry prepared with NaOH under the same solid content. 2 C 2 o 4For the Na source slurry, the lower viscosity is conducive to the delivery of the slurry during the spraying process and the stable control of the machinery and equipment. The volume average particle size of the powder obtained by sprayin...

Embodiment 3

[0019] Weigh a certain amount of α-Al 2 o 3 and Na 2 C 2 o 4 According to Na 2 O:Al 2 o 3 =1:7.6 ratio mixing ball mill, with deionized water as the ball milling medium, the mass ratio of solid raw material and deionized water is 0.8:1. After 4 hours of ball milling, the obtained slurry is spray-dried. The hot air inlet temperature of the spray drying equipment is 250°C, the outlet temperature is 125°C, the rotation speed of the atomizing disc is 10000r / min, and the feeding rate is automatically controlled according to the temperature. Material 5.5kg. Increasing the amount of deionized water in the process of ball milling reduces the solid content of the slurry, but can make α-Al 2 o 3 with Na 2 C 2 o 4 The raw materials are mixed more evenly, the viscosity of the slurry is correspondingly reduced, and the fluidity is enhanced, which is conducive to the smooth progress of the spraying process. The raw material powder obtained after spray drying has good spherici...

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Abstract

The invention relates to a method for preparing beta-Al2O3 precursor powder by spray drying taking water as a medium. The method is characterized by comprising the following steps of: performing ball milling on the medium with deionized water; adding a little amount of water-based dispersing agent; uniformly mixing the mixture by a mechanical ball milling method to obtain slurry; performing spraydrying on the slurry to obtain uniformly-mixed raw material powder particles; and performing high-temperature calcinations treatment on the powder after spray drying to obtain the beta-Al2O3 precursor powder which comprises Na precursor powder and Li precursor powder. The method adopts a water-based slurry spray drying method to solve the problem of potential safety hazard and environmental problem in the process of drying alcohol system slurry and can obtain the mixed powder with high sphericity, high flowability and uniform distribution of particle sizes. The method can obtain the beta-Al2O3 precursor powder with higher activities by performing high-temperature treatment on the powder at the temperature of between 800 and 1,250 DEG C, and is suitable for molding and preparing beta-Al2O3electrolytic ceramic components with high performance.

Description

technical field [0001] The invention relates to the preparation of β-Al by a spray drying method using water as the medium of a precursor powder 2 o 3 The method, more precisely involves a water-based spray-drying preparation of beta-Al 2 o 3 A precursor powder method belongs to the field of energy materials. Background technique [0002] Beta-Al 2 o 3 Ceramic materials have good Na + Ion conductivity, its ionic conductivity can reach 10 at room temperature -2 The order of magnitude of S / cm. beta-Al prepared by a certain ceramic forming method 2 o 3 Ceramic components are the core components of sodium-sulfur energy storage batteries and various other electrochemical devices. During application, beta-Al is required 2 o 3 Electrolyte ceramics have high ionic conductivity, high strength, and uniform and dense microstructure. A large number of studies have shown that the precursor powder obtained by the preliminary processing of the raw material powder has an import...

Claims

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Application Information

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IPC IPC(8): C04B35/626C04B35/10
Inventor 顾中华温兆银徐小刚张敬超徐孝和何维国
Owner 上海电气企业发展有限公司
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