Preparation method of spherical aluminum oxide

A spherical alumina, spherical particle technology, applied in chemical instruments and methods, alkali metal oxides/hydroxides, inorganic chemistry, etc. The surface is not smooth enough to achieve the effect of no pollution in the preparation process, high sphericity, and good hydrothermal stability.

Active Publication Date: 2017-06-27
PETROCHINA CO LTD
View PDF13 Cites 5 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0011] To sum up, in the high-speed ball forming device disclosed above, there is no step of rewetting the particle surface and completely drying the ball forming surface,

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
  • Preparation method of spherical aluminum oxide

Examples

Experimental program
Comparison scheme
Effect test

preparation example Construction

[0040] The invention provides a kind of preparation method of spherical aluminum oxide, comprises the steps:

[0041] Step 1: Mix pseudo-boehmite powder and molding aids, then add acid-containing deionized water, knead and extrude to make a long plastic body;

[0042] Step 2: On the premise that the surface of the strip-shaped plastic body does not stick, place it in the ball forming device to realize strip breaking and rolling granulation. After breaking the strip and granulating, keep the particles rotating while spraying the mist liquid Drops of wetting agent, on the premise that there is no adhesion between the particles, wet the surface of the particles, stop spraying and continue to rotate, when the particles become spherical particles with smooth surface, the cold air in the ball forming device is changed to hot air, and the spherical particles The surface dries and hardens, then the tumbling granulation is stopped; and

[0043] Step 3: Dry the spherical particles at a...

Embodiment 1

[0059] Take by weighing 100g of pseudo-boehmite powder (Sasol SB powder) prepared by the commercially available alcohol-aluminum method, take by weighing 2 g of safflower rubber powder, fully mix in a kneader; take by weighing 2 g of nitric acid (in terms of pure nitric acid weight), After adding 60g of deionized water to dilute, add it to a kneader and knead it into a block-shaped plastic body; use a low-pressure extruder and a clover-shaped orifice plate with a 4mm aperture to extrude the block-shaped plastic body into a bar-shaped plastic body. The cross-section is Clover shape, let it dry at room temperature for 2 hours; under the premise that the surface of the strip-shaped plastic body does not stick, place the strip-shaped plastic body in a high-speed ball forming device, set the speed at 100 rpm, and the strip-shaped plastic body completes strip breaking and rolling granulation ;Keep the rotating state, spray the ethanol wetting agent liquid from the external spray gun ...

Embodiment 2

[0065] Take by weighing commercially available pseudoboehmite powder (Sasol SB powder) 1000g prepared by aluminum alcohol method, take by weighing carbon black powder 50g, citric acid 50g, fully mix in kneader; Take by weighing nitric acid 40g (with pure nitric acid weight), add 400g of deionized water to dilute, add to the kneader together, and knead into a block-shaped plastic body; use a high-pressure extruder, 0.4mm hole diameter circular orifice plate, extrude the block-shaped plastic body into a bar-shaped plastic The cross-section is circular, and it is left to air at room temperature for 0.2h; on the premise that the surface of the strip-shaped plastic body does not stick, place the strip-shaped plastic body in a high-speed ball forming device, set the speed at 1500 rpm, and the strip-shaped plastic body is completed Strip breaking and rolling granulation; keep the rotating state, spray distilled water from the external spray gun in the high-speed ball forming device, s...

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
Wear indexaaaaaaaaaa
Login to view more

Abstract

The invention relates to a preparation method of spherical aluminum oxide. The method comprises the following steps: mixing pseudoboehmite powder and a forming aid, adding acid-containing deionized water, kneading, and extruding to obtain a strip plastic; putting the strip plastic in a balling device on the premise of no adhesion of the strip plastic surface to implement strip breaking and rolling granulation, spraying a misty liquid drop wetting agent while keeping the granules rotating, wetting the granule surfaces on the premise of no adhesion of the granules, stopping spraying, continuing rotation until the granules become spherical granules with smooth surfaces, changing cold air in the balling device into hot air, drying to harden the spherical granule surfaces, and stopping the rolling granulation; and drying the spherical granules, and roasting to finally obtain the aluminum oxide spherical carrier. The method solves the problems of unsmooth surface, poor sphericity and poor wear resistance in the balls prepared by the original process, and has the advantages of low preparation cost and no pollution in the preparation process.

Description

technical field [0001] The invention belongs to the field of preparation of inorganic materials, and relates to a preparation method of spherical alumina, more specifically, relates to a kind of alumina precursor which is kneaded, extruded, granulated and pelletized, finally dried and roasted to form a spherical alumina aluminum process. Background technique [0002] Alumina is widely used as a catalyst carrier and adsorbent because of its suitable specific surface area, controllable pore structure, good thermal stability, and strong adsorption capacity. In order to better perform, in addition to requiring better or more suitable carrier physical and chemical indicators (usually referring to specific surface, pore volume, pore size distribution, crushing strength, etc.), engineering applications (mass transfer, heat transfer, wear, etc.) There are also requirements for the shape of the catalyst, and the commonly used shapes are: spherical, ring, sheet, strip (cylindrical, c...

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): C04B35/10C04B35/626C04B35/63C04B35/632B01J20/08B01J20/28
CPCB01J20/08B01J20/28019C04B35/10C04B35/62695C04B35/6303C04B35/632
Inventor 张鹏胡长禄张上李知春吕雉李金潘晖华桂鹏龚奇菡
Owner PETROCHINA CO LTD
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Try Eureka
PatSnap group products

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

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap