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Method for preparing high-purity aluminum oxide precursor Al(OH)3

A high-purity alumina and precursor technology, applied in the direction of electrodes, cells, electrolysis process, etc., can solve problems such as complexity, high cost, and lengthy process flow, and achieve the goals of improving stability, high purity, and reducing electrolysis energy consumption Effect

Inactive Publication Date: 2021-06-01
UNIV OF SCI & TECH BEIJING +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0010] The object of the present invention is to provide a method for preparing high-purity alumina precursor Al(OH) for the problems of lengthy, complex and high-cost purification and preparation of high-purity alumina process in the prior art. 3 In this method, high-purity aluminum is melted and cast into a plate as the anode, the inert material is the cathode, and the acidic solution is used as the electrolyte, and the electrolytic cell is divided into an anode electrolytic cell and a cathodic electrolytic cell by a porous membrane to form an electrolytic cell. When an external field is applied to strengthen the Al(OH) on the cathode 3 Particles fall off, avoid anode concentration polarization, and can efficiently and cleanly prepare high-purity alumina precursor Al(OH) 3 , and the process is regulated by electrochemical parameters, which is convenient and controllable, with high product purity, controllable particle size, controllable particle uniformity, and high efficiency

Method used

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  • Method for preparing high-purity aluminum oxide precursor Al(OH)3
  • Method for preparing high-purity aluminum oxide precursor Al(OH)3
  • Method for preparing high-purity aluminum oxide precursor Al(OH)3

Examples

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Embodiment 1

[0047] combine figure 1 Shown, a kind of preparation high-purity alumina precursor Al(OH) of the present embodiment 3 The method, the steps are: select high-purity aluminum as the anode plate 112, and obtain Al(OH) 3 Product 121, then the Al(OH) 3 The product 121 is successively filtered, washed and dried to obtain a high-purity alumina precursor. The specific steps are:

[0048] Step 1, preparation of anode plate 112

[0049] First heat high-purity aluminum with a purity of 99-99.999% to melt, then cast it into an aluminum plate, and polish and clean the surface of the aluminum plate to obtain the anode plate 112, which is dried and stored in an inert gas environment for future use ; Its purpose is to remove impurities and oil stains on the surface of the anode plate 112 to prevent him from entering the electrolysis system and causing pollution.

[0050] Step 2. Electric Assisted Conversion

[0051] The anode plate 112 obtained in step 1 is used as the anode, the inert ...

Embodiment 2

[0072] The present embodiment is basically the same as Embodiment 1, the difference being that the external field 300 is an ultrasonic field, and an anode ultrasonic transmitter 310 and a cathode ultrasonic transmitter 320 are respectively arranged at the anode electrolyzer 110 and the cathode electrolyzer 120, respectively to the anode electrolyzer 120. 110 and cathode electrolytic cell 120 emit an ultrasonic field; the ultrasonic frequency of the ultrasonic field is 10-3000 kHz, the ultrasonic power is 0-3000 W, and the ultrasonic external field application method in this embodiment is continuous application. The purity, maximum diameter, and current efficiency of the electrolytic cell of the high-purity alumina precursor are recorded in Table 1. It can be seen that the maximum diameter of the obtained ultrapure alumina precursor is further reduced to 26 μm compared with Example 1, which may be due to the fact that the ultrasonic field directly acts on the acidic solution, wh...

Embodiment 3

[0074] This example is basically the same as Example 1, except that the electric field is applied intermittently, and the purity, maximum diameter and current efficiency of the electrolytic cell of the high-purity alumina precursor are recorded in Table 1.

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Abstract

The invention discloses a method for preparing a high-purity aluminum oxide precursor Al(OH)3, and belongs to the technical field of preparation of high-purity aluminum oxide. The preparation method comprises the following steps: selecting high-purity aluminum as an anode plate, conducting treatment under the action of electric auxiliary conversion and an external field, meanwhile filtering anode impurities by using a porous membrane, so as to obtain an Al(OH)3 product, and filtering, washing and drying the Al(OH)3 product in sequence to obtain a high-purity aluminum oxide precursor. The porous membrane can prevent anode impurities from polluting an electrolysis product Al(OH)3, an external field not only promotes Al<3+> to penetrate through the porous membrane and improves the electrolysis rate and efficiency, but also can control the opportunity that Al(OH)3 falls off from a cathode, prevent the Al(OH)3 from growing, ensure the uniformity of the size and realize the control on the particle size of generated Al(OH)3 particles, and the purity of the product Al(OH)3 is high. Anode mud generated in the production process can be used for preparing a primary aluminum by-product, and the cathode generates a hydrogen by-product, so that the economical efficiency of the technology can be improved.

Description

technical field [0001] The invention relates to the technical field of high-purity alumina preparation, more specifically, to a method for preparing high-purity alumina precursor Al(OH) 3 Methods. Background technique [0002] Transparent ceramic materials belong to a large category of advanced ceramics. They have excellent high light transmittance, and at the same time have outstanding characteristics such as high strength, high hardness, corrosion resistance, and high temperature resistance of structural ceramics. It has broad application prospects in equipment, detection, exploration and other equipment, and is one of the hotspots of the top materials at the forefront of science and technology in the world. [0003] In order to ensure the transparency of ceramic materials, the primary task is to use high-purity raw materials, which is one of the important reasons why my country currently relies on imports for almost all related materials. Only by stably preparing high-p...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C25B1/01C25B11/042C25B9/19C25B9/65
CPCC25B1/00C25B11/04
Inventor 李亚琼张立峰音正元
Owner UNIV OF SCI & TECH BEIJING
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