Unlock instant, AI-driven research and patent intelligence for your innovation.

Method for preparing high-purity alumina powder by alternating current electrolysis

A high-purity alumina, AC power technology, applied in the electrolysis process, electrolysis components, etc., to achieve the effects of low energy consumption, simple process flow, and fast response

Active Publication Date: 2014-09-17
张纯威
View PDF8 Cites 12 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The hydrolysis method of active metal aluminum powder uses the atomization powder making process to obtain highly active aluminum powder, which makes the aluminum powder and pure water undergo intense hydrolysis reaction, but the smelting and atomization of metal aluminum is very easy to introduce new impurities

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Method for preparing high-purity alumina powder by alternating current electrolysis

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] Operation reference figure 1 , the preparation steps are as follows: 1) 200 grams of metal aluminum sheets (99.99% purity) each, placed in 500ml of alkaline water (pH 11.54), 2) The two metal aluminum sheets were respectively connected to 0.5V AC power electrodes, The frequency is 5000Hz, 3) Keep the stirring rate at 60 rpm and the solution temperature at 55°C. After 36 hours of reaction, a total of 49 grams of metal aluminum flakes remain. 4) Filter the white aluminum hydroxide precipitate formed by the reaction, dry it at 100°C and weigh it 144 grams of aluminum hydroxide powder was obtained, and the aluminum hydroxide powder was calcined at 1200°C for 1 hour to obtain 93 grams of alumina powder, with a yield of 95.5% and a purity of 99.995%.

Embodiment 2

[0024] The preparation steps are as follows: 1) 200 grams of metal aluminum sheets (purity: 99.996%) each, placed in 500ml of alkaline water (pH 11.84); 1000Hz, 3) Keep the stirring rate at 80 rpm, the solution temperature at 65°C, the remaining metal aluminum flakes are 47 grams after the reaction time of 26 hours, 4) Filter the white aluminum hydroxide precipitate formed by the reaction, dry it at 100°C and weigh it to obtain 149 grams of aluminum hydroxide powder was calcined at 1200°C for 1 hour to obtain 95 grams of aluminum oxide powder with a yield of 95.5% and a purity of 99.999%.

Embodiment 3

[0026] The preparation steps are as follows: 1) 200 grams of metal aluminum sheets (purity: 99.996%) each piece, placed in 500ml of alkaline water (pH 11.27), 2) two metal aluminum sheets were respectively connected to electrodes of 100V AC power supply, frequency 50Hz, 3) Keep the stirring rate at 100 rpm, the solution temperature at 80°C, the remaining metal aluminum flakes are 35 grams after 28 hours of reaction time, 4) Filter the white aluminum hydroxide precipitate formed by the reaction, dry it at 100°C and weigh it to obtain 186 grams of aluminum hydroxide powder were calcined at 1200°C for 1 hour to obtain 119 grams of aluminum oxide powder with a yield of 97.7% and a purity of 99.999%.

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

PropertyMeasurementUnit
electrical resistivityaaaaaaaaaa
Login to View More

Abstract

The invention belongs to the technical field of the preparation of alumina and in particular relates to a method for preparing high-purity alumina powder by alternating current electrolysis. The method comprises the following steps of a) placing two parts of high-purity aluminum respectively used as an anode and a cathode in alkaline water, 2) respectively connecting the two parts of high-purity aluminum serving as the anode and cathode with positive and negative electrodes of an alternating current power supply, 3) heating, stirring and reacting, and 4) filtering the obtained aluminum hydroxide precipitate, drying and calcining to obtain high-purity alumina powder. According to the method disclosed by the invention, since no chemical substances are required to be added, the method has the advantages of simple process, fast reaction, high production efficiency, no pollution in the production process and low energy consumption.

Description

[0001] technical field [0002] The invention belongs to the technical field of alumina preparation, and in particular relates to a method for preparing high-purity alumina powder by alternating current electrolysis. Background technique [0003] High-purity alumina powder (≥99.99%) is widely used in infrared receiving window materials for missile guidance, integrated circuit ceramic substrates in the information industry, information display materials and devices, special high-grade ceramic devices in fine chemicals, artificial red and sapphire for laser technology , catalyst carrier and other high-tech fields. [0004] There are many ways to prepare high-purity ultrafine alumina powder at home and abroad, but up to now, the only technologies that have realized industrial production are aluminum ammonium sulfate pyrolysis, aluminum ammonium carbonate pyrolysis, aluminum isopropoxide hydrolysis and metal aluminum Choline hydrolysis method, active metal aluminum powder h...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
Patent Type & Authority Applications(China)
IPC IPC(8): C25B1/00
Inventor 张纯威胡劲刘军生
Owner 张纯威