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Preparation method and device of aluminum oxide clinker, and the aluminum oxide clinker

A technology of alumina and clinker, which is applied in the field of alumina clinker preparation, can solve the problems of rotary kiln burnout, difficulty reaching 40%, heat waste, etc., and achieve the effect of reducing sintering energy consumption

Inactive Publication Date: 2016-08-10
GUIZHOU BRANCH CHINA ALUMINUM IND
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, it is difficult to sinter high-grade alumina clinker with a rotary kiln. This is because the liquid phase that appears during sintering will decrease after the clinker grade increases, and the rotary kiln will not be able to hang on the kiln skin. The rotary kiln will burn out soon
Although the process of strengthening sintering has been proposed at present, the grade of clinker alumina can only reach about 38%, and it is difficult to reach more than 40%.
Moreover, in the sintering method, the moisture content of the slurry entering the kiln is about 40%, and the moisture needs to be dried in the kiln, so the thermal efficiency is very low. At the same time, the temperature of the exhaust gas from the kiln is still about 200°C, and a large amount of heat is wasted.

Method used

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  • Preparation method and device of aluminum oxide clinker, and the aluminum oxide clinker
  • Preparation method and device of aluminum oxide clinker, and the aluminum oxide clinker
  • Preparation method and device of aluminum oxide clinker, and the aluminum oxide clinker

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preparation example Construction

[0045] See attached figure 1 And figure 2 The method for preparing alumina clinker provided by the present invention includes the following steps:

[0046] Step S1: preparing a mixture of ore, limestone, and alkali powder to obtain a first intermediate product;

[0047] Step S2: pressing the first intermediate product to shape it into a brick;

[0048] Step S3: Send the bricks into the tunnel kiln for sintering to obtain alumina clinker.

[0049] The preparation method of alumina clinker provided by the present invention uses a tunnel kiln to sinter the first intermediate product after compression molding: First, since the tunnel kiln does not need to hang the kiln skin, the grade of the alumina clinker can be increased to 40%-50%; Secondly, because the tunnel kiln is relatively long, the heat required in the sintering process can be fully utilized, so the energy consumption of sintering can be reduced.

[0050] Among them, the alkali powder is selected from one or more of the dry alk...

Embodiment 1～21、 comparative example 1～3

[0064]

[0065] Note, among them, Examples 1-21 are sintered in a tunnel kiln, and Comparative Examples 1 to 3 are the cases where a rotary kiln is used as the sintering equipment.

[0066] In Examples 1 to 21 and Comparative Examples 1 to 3 shown in the above table, it can be seen that when the operating parameters are the same,

[0067] When a tunnel kiln is used for sintering, the mass percentage of moisture in the raw materials entering the kiln is between 5% and 15%, and the moisture to be dried is less. Therefore, the thermal efficiency of the tunnel kiln is higher. The temperature of the kiln is reduced to below 60℃, the heat can be fully utilized, and the thermal efficiency is high. At the same time, the grade of alumina clinker can reach 40%-50%;

[0068] When the rotary kiln is used for sintering, the mass percentage of moisture in the raw materials entering the kiln is mostly about 40%, and there is more moisture to be dried. Therefore, the thermal efficiency of the rotary...

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Abstract

The invention discloses a preparation method and a device of an aluminum oxide clinker, and the aluminum oxide clinker and belongs to the technical field of aluminum oxide clinkers. The method includes the steps of: preparing a mixture of ore, limestone and alkali powder to form a first intermediate; pressing the first intermediate to form bricks; and sintering the bricks in a tunnel kiln to obtain the aluminum oxide clinker. The device includes: a mixing container, a brick presser, and the tunnel kiln, wherein the mixing container is used for containing the ore, limestone and alkali powder to prepare the first intermediate; the brick presser is used for pressing the first intermediate to form bricks; and the tunnel kiln is used for sintering the bricks to obtain the aluminum oxide clinker. The aluminum oxide clinker is prepared through the method and the device. The aluminum oxide clinker herein is 40-50% in grade and is reduced in sintering energy consumption.

Description

Technical field [0001] The invention relates to the technical field of alumina clinker, in particular to a preparation method and equipment of alumina clinker, and the alumina clinker. Background technique [0002] Many domestic manufacturers use sintering method to produce alumina. The sintering method is to use ingredients such as bauxite, mother liquor of carbon (sodium carbonate) and limestone, and the proportion is according to Na 2 O: Al 2 O 3 (Molecular ratio) about 1.0, CaO: SiO 2 (Molecular ratio) calculated at about 2.0, the prepared slurry has a moisture content of about 40%, and the slurry is sprayed into the rotary kiln for sintering, and the phase composition is mainly Na 2 O·Al 2 O 3 And 2CaO·SiO 2 Clinker, clinker dissolution, Na 2 O·Al 2 O 3 Into the solution, and 2CaO·SiO 2 Into the slag phase (red mud), the solution is further decomposed to obtain aluminum hydroxide, which is roasted to obtain alumina. [0003] Increasing the grade of clinker can reduce the amoun...

Claims

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Application Information

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IPC IPC(8): C01F7/08
CPCC01F7/08
Inventor 王晓锋徐立军姚毅
Owner GUIZHOU BRANCH CHINA ALUMINUM IND