Check patentability & draft patents in minutes with Patsnap Eureka AI!

Method for preparing alpha-Al2O3 from dust powder collected by electricity

A technology of electric dust collection and dust powder, applied in the direction of alumina/hydroxide, etc., can solve the problem of reducing the quality and performance of metallurgical grade alumina, the adverse effects of the purity and particle size of finished alumina, and the comprehensive performance of the product is not suitable for production raw materials and other issues to achieve the effect of improving the level of comprehensive utilization, reducing adverse effects, and improving market competitiveness

Active Publication Date: 2005-10-26
中铝新材料郑州有限公司 +1
View PDF0 Cites 13 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This part of the dust collection powder has high impurity content, fine particle size, poor fluidity, and the overall performance of the product is not suitable for the production of electrolytic aluminum. The current production process is to return this part of the dust collection powder to the process, which will affect the purity and particle size of the finished alumina come to adverse effects, reducing the quality and performance of metallurgical grade alumina

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 alpha-Al2O3 from dust powder collected by electricity

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0016] The electric dust collection powder is used as the raw material. It is first screened with a 60-mesh sieve to remove the large particles of impurities, and then the dust collection powder under the sieve and the additive ammonium fluoride are homogenized in a three-dimensional mixer. The time is 0.5 hours, and the amount of ammonium fluoride added is 10‰ of the mass of dust collection powder on a dry basis. Put the homogenized mixed material into a high-aluminum saggar and put it into a 0.2m 3 Calcined in a high-temperature kiln at 1350°C for 3 hours, then taken out from the sagger, crushed, milled in a 50Kg corundum porcelain-lined ball mill for 30 minutes, and passed through a 200-mesh sieve to obtain the under-sieve product Al 2 o 3 The purity is 99.8%, Na 2 O content 0.020%, true specific gravity 3.96g / cm 3 , The α-phase transformation rate is 95.5%, and the primary crystal size is 5 μm.

Embodiment 2

[0018] Electric dust collection powder is used as raw material, first sieved with a 60-mesh sieve to remove large particles of impurities, and then the dust collection powder under the sieve and the additive ammonium fluoride are homogenized in a three-dimensional mixer, and the processing time For 0.5 hours, the amount of ammonium fluoride added is 20‰ of the mass of dust collection powder on a dry basis. Put the homogenized mixed material into a high-aluminum saggar and put it into a 0.2m 3 Calcined in a high-temperature kiln at 1250°C for 4 hours, then taken out from the sagger, crushed, milled in a 50Kg corundum porcelain-lined ball mill for 30 minutes, and passed through a 200-mesh sieve to obtain the under-sieve product Al 2 o 3 The purity is 99.8%, Na 2 O content 0.019%, true specific gravity 3.95g / cm 3 , The α-phase conversion rate is 95%, and the primary crystal size is 4 μm.

Embodiment 3

[0020] The electric dust collection powder is used as the raw material. It is first screened with a 100-mesh sieve to remove the large particles of impurities, and then the dust collection powder under the sieve and the additive aluminum fluoride are homogenized in a three-dimensional mixer. The processing time For 0.5 hours, the amount of ammonium fluoride added is 5‰ of the mass of dust collection powder on a dry basis. Fill the homogenized mixed material with 20% water (mass ratio to dry basis material), and add methyl cellulose binder accounting for 5‰ of dry basis material mass ratio, use a kneading pot to mix well, after mixing Use a small vacuum mud mixer to extrude into lumps, and dry them in an oven at about 260°C. The dried materials are stacked on the silicon carbide and silicon nitride shed board kiln furniture, and placed in a 0.2m 3 Calcined in a high-temperature kiln at 1450°C for 3 hours, then ball-milled with a 50Kg corundum porcelain-lined ball mill for 30 mi...

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 present invention relates to a method for preparing alpha-Al2O3 by using electric dust-collected power, and it is a treatment method of electric dust-collected powder obtained in the process of producing alumina by boiling and roasting aluminium hydroxide, in particular, it relates to a technique for preparing alpha-alumina which can be used as refractory material and ceramic and grinding material. It is characterized by that after a certain quantity of additive containing boron or containing no boron is added, all the materials are uniformly mixed, and undergone the process of dry-pressing forming or mud-mixing extruding to form block or balling pretreatment, then the above-mentioned mixed material is placed in a box pot and calcined at high-temp. so as to obtain the alpha-Al2O3.

Description

technical field [0001] A preparation of α-Al by electric dust collection powder 2 o 3 The method relates to a treatment method for electric dust collection powder in the process of aluminum hydroxide boiling and roasting to produce alumina, especially a preparation technology for using it as α-alumina for refractory materials, ceramics and grinding materials. Background technique [0002] In the process of producing alumina by boiling and roasting aluminum hydroxide in my country, electric dust collector powder should be produced which accounts for 3% to 8% of the output of finished alumina. This part of the dust collection powder has high impurity content, fine particle size, poor fluidity, and the overall performance of the product is not suitable for the production of electrolytic aluminum. The current production process is to return this part of the dust collection powder to the process, which will affect the purity and particle size of the finished alumina. The advers...

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): C01F7/02
Inventor 王庆伟萨本榕王建立
Owner 中铝新材料郑州有限公司
Features
  • R&D
  • Intellectual Property
  • Life Sciences
  • Materials
  • Tech Scout
Why Patsnap Eureka
  • Unparalleled Data Quality
  • Higher Quality Content
  • 60% Fewer Hallucinations
Social media
Patsnap Eureka Blog
Learn More

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic, Popular Technical Reports.

© 2025 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap|About US| Contact US: help@patsnap.com