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A kind of preparation method of spherical alumina

A spherical alumina and ball-forming technology, applied in the field of preparation of spherical alumina, can solve the problems of insufficient surface smoothness, poor wear resistance, insufficient spherical shape of small balls, etc., and achieve good wear resistance, low preparation cost, water Good thermal stability

Active Publication Date: 2020-06-09
PETROCHINA CO LTD
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  • 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 strip-cutting step or process requirements for strip-cutting before rolling the ball, and there is no step for re-wetting the particle surface, which leads to insufficient sphericity of the prepared small balls, and the surface Not smooth enough, poor wear resistance

Method used

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  • A kind of preparation method of spherical alumina

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preparation example Construction

[0044] The invention provides a method for preparing spherical alumina, which is prepared according to the following process steps:

[0045] Step 1: Mix pseudo-boehmite powder and molding aids, then add acid-containing deionized water, knead and extrude to make a long plastic body;

[0046] Step 2: Cut the strip-shaped plastic body into particles with a length-to-diameter ratio of 0.5 to 2 in the radial direction, and place them in the ball forming device to realize the rolling ball under the premise that the surface of the particles does not stick together, and then spray into 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, stop rolling and granulating; and

[0047] Step 3: Dry the spherical particles at a drying temperature of 80-120°C for 1-5 hours, and then roast them at a temperat...

Embodiment 1

[0063] 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-shaped, let it air at room temperature for 2 hours; cut the extruded strip-shaped plastic body radially into plastic particles with a length-to-diameter ratio of 0.8, place the plastic particles in a high-speed ball forming device, set the speed at 100 rpm, The particles are rolled at high speed; keep the rotating state, spray the misty wetting agent ethanol liquid from the external spray gun in the high-sp...

Embodiment 2

[0073] 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; the extruded strip-shaped plastic body is cut radially into plastic particles with a length-to-diameter ratio of 1.2, and the plastic particles are placed in a high-speed ball forming device. The speed is 1500 rpm, and the particles roll at high speed; keep the rotating state, spray distilled water from the external spray gun in the high-speed ball forming device, stop spraying when...

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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; cutting the strip plastic in the radial direction to obtain the granules with the length-diameter ratio of 0.5-2, putting the granules in a balling device on the premise of no adhesion of the granule surfaces to implement rotary balling, spraying a misty liquid drop wetting agent, 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, 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 nonuniform size, unsmooth surface, poor sphericity and poor wear resistance in the balls prepared by the original forming granulation 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, cut and rolled at high speed, and finally dried and roasted to form a spherical shape Alumina 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 (cylindrica...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B35/10C04B35/632C04B35/626
CPCC04B35/10C04B35/62695C04B35/632
Inventor 张鹏李知春胡长禄李金吕雉张上潘晖华桂鹏龚奇菡
Owner PETROCHINA CO LTD
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