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

Method for preparing submicron aluminium oxide by two-stage roasting method

A sub-micron, alumina technology, applied in the preparation of alumina/hydroxide, can solve the problems of harsh conditions, high cost, complex process, etc., and achieve the effect of good dispersion, low cost and uniform particles

Inactive Publication Date: 2011-04-13
GUIZHOU BRANCH CHINA ALUMINUM IND
View PDF10 Cites 15 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] At present, there are still many problems in the preparation technology and application of submicron alumina powder, mainly: the shape of submicron alumina is difficult to control, the problem of product agglomeration is difficult to solve, the particle size distribution of the product is wide, the process is complicated, Harsh conditions, high cost and poor reproducibility of the preparation process

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

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] Using industrial aluminum hydroxide as raw material, under the protection of nitrogen, carry out a stage of roasting at 400 ° C, keep warm for 3 hrs to obtain activated alumina, then wash with 3 mol / l oxalic acid for 3 times, filter and dry, add 0.5% NH 4 Cl, 1.0% polyacrylamide, 0.8% boric acid, after mixing evenly, carry out two-stage sintering at 1400 ° C, keep warm for 2 hours, and finally obtain 0.7 μm alumina powder.

Embodiment 2

[0023] Using industrial aluminum hydroxide as raw material, under the protection of nitrogen, carry out a stage of roasting at 900 ° C, keep warm for 1 hr to obtain activated alumina, then wash with 3 mol / l oxalic acid for 3 times, filter and dry, add 0.2% NH 4 Cl, 0.2% polyacrylamide, 0.8% boric acid, after mixing evenly, carry out two-stage sintering at 1100°C, keep warm for 2hrs, and finally obtain 0.8μm alumina powder.

Embodiment 3

[0025] Using industrial aluminum hydroxide as raw material, under the protection of nitrogen, carry out a stage of roasting at 600 ° C, keep warm for 1.5 hrs to obtain activated alumina, then wash with 3 mol / l oxalic acid for 3 times, filter and dry, add 2.2% NH 4 Cl, 1.2% polyacrylamide, 0.5% boric acid, after mixing evenly, carry out two-stage sintering at 1320°C, keep warm for 2hrs, and finally obtain 0.4μm alumina powder.

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

No PUM Login to View More

Abstract

The invention provides a method for preparing submicron aluminium oxide by a two-stage roasting method, relating to a method for preparing important structural and functional material submicron aluminium oxide used in the fields of electricity, medical treatment, information and the like. The method is characterized in that fluidization primary roasting is carried out on industrial aluminium hydroxide taken as a raw material at the temperature of 400-900 DEG C under the protection of nitrogen, thus obtaining activated aluminium oxide; then organic pickling is carried out, filtering and drying are carried out, and additive is added, so that particle dispersion is uniform, aluminium oxide crystal grains are inhibited from growing at high temperature, and the crystal grains purified; and the crystal grains are evenly mixed, and secondary roasting is carried out at the temperature of 1100-1400 DEG C, thus obtaining the submicron aluminium oxide powder. The submicron aluminium oxide powder prepared by the method has uniform particles, the average grain size is less than or equal to 0.9mu m, the purity is high, and the dispersibility is good. The preparation method is simple, and is low in cost and good in repeatability, thus being easy to realize industrialization.

Description

technical field [0001] The invention relates to a method for preparing submicron-level alumina by a two-stage roasting method, and relates to a method for submicron-level alumina which is an important structural and functional material used in the fields of electricity, medicine, information and the like. Background technique [0002] Submicron alumina powder has special properties such as small size effect, surface effect, quantum effect and macroscopic quantum tunneling effect due to its high purity, fine particles and uniform distribution, and its surface electronic structure and crystal structure have changed greatly. Bulk materials have completely different properties, which make them have more excellent properties and broad application prospects. [0003] Patent CN92104368.6 reports a preparation method of nanometer and submicron alumina powder with controllable size. This method utilizes pure aluminum flakes to be activated and hydrolyzed, followed by high temperature...

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
IPC IPC(8): C01F7/30
Inventor 王锦王建立仓向辉张明惠
Owner GUIZHOU BRANCH CHINA ALUMINUM IND