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A method for producing α-al2o3 by using aluminum hydroxide as raw material and adopting a pre-decomposition process

A technology of aluminum hydroxide and pre-decomposition, which is applied in the preparation of alumina/hydroxide, etc., which can solve the problem of difficulty in ensuring the stability and large-scale production of special alumina, difficulty in realizing production control automation, and not suitable for production and use in ordinary enterprises, etc. problems, to achieve the effects of shortening production time, small footprint and high production efficiency

Active Publication Date: 2015-12-02
LUOYANG CEMENT ENG DESIGN & RES INST
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] At present, domestic and foreign special alumina α-Al 2 o 3 There are two main production methods, one method is to use aluminum hydroxide or γ-Al 2 o 3 As raw material, heavy oil is used as raw material, and it is produced by calcining in a small rotary kiln; one is made of aluminum hydroxide (or γ-Al 2 o 3 ) as raw material, using coal powder as raw material, adopting tunnel kiln, encapsulating the raw material into a bowl for calcination, low output, poor quality stability, high energy consumption ((2500—3500)×4.18kj / kg)
Both of these methods are difficult to ensure that the special alumina α-Al 2 o 3 The stability of product quality and large-scale production make it difficult to automate production control
[0004] The patent document with application number 94105290.7 discloses α-alumina powder and its production method. The manufacturing process is complicated, the cost is high, the number of equipment used is large, and the production process parameters are high, which is not suitable for ordinary enterprises.

Method used

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  • A method for producing α-al2o3 by using aluminum hydroxide as raw material and adopting a pre-decomposition process
  • A method for producing α-al2o3 by using aluminum hydroxide as raw material and adopting a pre-decomposition process

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Effect test

Embodiment 1

[0024] The aluminum hydroxide raw material is fed into the Venturi dryer 2 through the feeding system 1, the aluminum hydroxide raw material is dried in the Venturi dryer 2, and then enters the cyclone preheater-3 for material gas separation, and the separated gas passes through the dust removal system 11 Discharge after treatment, the separated aluminum hydroxide raw material is preheated in the cyclone preheater 2 4 and enters the roasting furnace 6 for decomposition and roasting, and after the cyclone preheater 3 5 feed gas is separated, it enters the rotary kiln 9 for high-temperature calcination. In the cooling machine 10, the indirect heat exchange with the cold air, the high-temperature air flow after heat exchange is used for secondary use, and the cooled finished product α-Al 2 o 3 store.

Embodiment 2

[0026] The aluminum hydroxide raw material enters the feeding system 1 and is metered by the metering device, and then is continuously fed into the Venturi dryer 2 by the feeding device; the high-pressure air generated by the Roots blower is the primary air, and the natural gas and the primary air are combusted with natural gas through the kiln. The device 8 enters the rotary kiln 9, and the kiln uses the natural gas burner 8 to ignite the natural gas, and the hot gas produced enters the roasting furnace 6 from the smoke chamber at the rear of the rotary kiln 9; the natural gas enters the roasting furnace 6 from the natural gas burner 7 for combustion, and the heat generated After the gas is mixed with the hot gas from the smoke chamber at the end of the rotary kiln 9, it passes through the cyclone preheater 3 5 and the cyclone preheater 2 4, and enters the Venturi dryer 2 from the gas inlet of the Venturi dryer 2, and the mixed hot gas is The aluminum hydroxide raw material is...

Embodiment 3

[0028] The dried aluminum hydroxide goes through the pipeline with the hot gas and enters the cyclone preheater-3 from the feed gas outlet of the Venturi dryer 2 to separate the feed gas. The pipeline enters the dust removal system 11, and after being treated by the dust removal system 11, it is discharged up to the standard, and the materials separated from the waste gas by the dust removal system 11 are recycled.

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Abstract

The invention discloses a method for producing alpha-Al2O3 by employing a predecomposition technology and taking aluminium hydrogen as a raw material. The method adopts a feeding system, a Venturi dyer, a first cyclone preheater, a second cyclone preheater, a third cyclone preheater, a roasting furnace, a natural gas burner, a kiln natural gas burner, a rotary kiln, a cooler and a dust removal system. Special aluminum oxide alpha-Al2O3 is produced by adopting a predecomposition technology. Large-scale production, low energy consumption (950*4.18kj / kg) and stable quality can be achieved, and achievement of automatic production control is achieved. The method is fewer in used equipments, small in floor area, simple in operation, high in quality of produced alpha-Al2O3, high in production efficiency, and simple and convenient in operation process, reduction of the production cost is facilitated, the operation flow is greatly simplified, the production time is shortened, and improvement of economic benefits of enterprises is facilitated.

Description

technical field [0001] The present invention relates to α-Al 2 o 3 In the field of production technology, especially a kind of production of α-Al by using aluminum hydroxide as raw material and adopting pre-decomposition process 2 o 3 Methods. Background technique [0002] In recent years, my country has made special alumina α-Al 2 o 3 Application is a key point in the development of high-tech industries, and investment in application foundation and industrialization will be increased. [0003] At present, domestic and foreign special alumina α-Al 2 o 3 There are two main production methods, one method is to use aluminum hydroxide or γ-Al 2 o 3 As raw material, heavy oil is used as raw material, and it is produced by calcining in a small rotary kiln; one is made of aluminum hydroxide (or γ-Al 2 o 3 ) as raw material, coal powder is used as raw material, tunnel kiln is used, and the raw material is packaged into a bowl for calcination. The output is low, the qualit...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01F7/30
Inventor 王群红牛华民缪祥来崔艳华梁军伟
Owner LUOYANG CEMENT ENG DESIGN & RES INST