Method for preparing high-purity alpha-aluminium oxide by means of waste activated aluminium oxide

An activated alumina, high-purity technology, applied in the field of waste resource reuse, can solve the problems of low recycling rate of waste alumina, unreasonable treatment methods, ecological environment pollution, etc. The effect of low surface area

Inactive Publication Date: 2018-09-28
CENT SOUTH UNIV +1
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] Aiming at technical problems such as ecological environment pollution and waste of resources in waste activated alumina in the prior art, the purpose of the present invention is to provide a method for producing hydrogen peroxide (hydrogen peroxide) by anthraquinone method containing organic anthraquinone and inorganic alkali Waste activated alumina (γ-type activated alumina) with other impurities is prepared by solid phase method to prepare high-purity α-Al 2 o 3 The material method, which realizes the resource utilization of waste activated alumina, solves the problems of low recycling rate of waste alumina produced in the production process of hydrogen peroxide, unreasonable treatment methods, and waste of resources.

Method used

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  • Method for preparing high-purity alpha-aluminium oxide by means of waste activated aluminium oxide
  • Method for preparing high-purity alpha-aluminium oxide by means of waste activated aluminium oxide
  • Method for preparing high-purity alpha-aluminium oxide by means of waste activated aluminium oxide

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Embodiment 1～4

[0029] Following embodiments 1~4 are all carried out by following operations:

[0030] 1) Source of raw material: The raw material comes from the hydrogen peroxide production plant A: the invalid waste activated alumina in the regeneration bed of the hydrogenation solution and the clay bed in the production of hydrogen peroxide, with an average particle size of 2mm.

[0031] 2) Equipment: straight cylinder rotary kiln, cylinder diameter 2200mm, cylinder length 45000mm, slope 3%, speed 2r / min; cooling machine adopts single cylinder cooling machine, the specification is preferred The rotating speed is 6r / min, and the residence time is 30min.

[0032] 3) Calcination treatment process: the raw materials enter the rotary kiln preheating tower through the elevator for drying, and the rotary kiln drives the materials into the reaction zone of the kiln body, and undergoes chemical and physical processes such as drying, preheating, calcination, and cooling in sequence. High purity α-...

Embodiment 1

[0034] By adding 2% (w / w) α-Al 2 o 3 The seed powder makes the moisture content in the raw material 10%, the total organic matter content 6%, and the alumina content 81%. The material is heated to 1300 ℃ at a rate of 95 ℃ / m in the rotary kiln, and the holding time of the high temperature section is 2 hours. The total residence time is 4h; the inlet pressure of the rotary kiln is 3Pa, the flue gas temperature is 360°C, the outlet pressure of the rotary kiln is -31Pa, the flue gas temperature is 560°C, and the material enters the cooler to cool down at a rate of up to 90°C / m. Discharge.

Embodiment 2

[0036] By adding 2.5% (w / w) α-Al 2 o 3 The seed crystal powder makes the moisture content in the raw material 8%, the total organic matter content is 5%, and the alumina content is 84%. The residence time is 4h; the inlet pressure of the rotary kiln is 5Pa, the flue gas temperature is 340°C, the outlet pressure of the rotary kiln is -32Pa, the flue gas temperature is 540°C, the material enters the cooler and cools at a rate of up to 90°C / m, material.

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Abstract

The invention discloses a method for preparing high-purity alpha-Al2O3 by means of waste activated aluminium oxide. According to the method, after the waste activated aluminium oxide and alpha-Al2O3 seed crystal powder are mixed, the mixture enters a rotary kiln preheating tower for drying and preheating first, the preheated and mixed material enters a reaction area of a rotary kiln to complete acalcination process, the calcinated material is unloaded into a cooler for cooling, and the cooled material is screened to obtain the alpha-Al2O3. According to the method, the waste activated aluminium oxide (gamma-type activated aluminium oxide) which contains organic anthraquinone, impurities including inorganic base and the like in a process of producing hydrogen peroxide (hydrogen peroxide) through an anthraquinone method is used for preparing a high-purity alpha-Al2O3 material through a solid phase method, so that resourceful utilization of the waste activated aluminium oxide is achieved,the problems are solved that the recovery and utilization rate of the waste aluminium oxide generated in the existing hydrogen peroxide production process is low, the treatment mode is unreasonable,and resources are waste.

Description

technical field [0001] The invention relates to a method for reusing waste activated alumina, in particular to a method for preparing high-purity α -Al 2 o 3 The invention relates to a material method, which belongs to the technical field of recycling waste resources. Background technique [0002] Hydrogen peroxide is an important inorganic chemical raw material and fine chemical product. As an oxidizing agent, bleaching agent, and disinfectant, it is widely used in the fields of chemical industry, textile, papermaking, medicine, metallurgy, electronics, agriculture, military affairs, and environmental protection. With the rapid development of economic globalization, the application fields of hydrogen peroxide continue to expand, and the demand for hydrogen peroxide also continues to increase. The preparation of hydrogen peroxide by anthraquinone method is currently one of the most mature production methods in this industry in the world. The method consists of hydrogenati...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01F7/46
CPCC01F7/442C01F7/46C01P2006/80
Inventor 李灏阳李立清苏长青王新伟
Owner CENT SOUTH UNIV
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