Preparation method of aluminum-chromium alloy

A technology of aluminum-chromium alloy and chromium content, applied in the direction of electrodes, electrolysis process, electrolysis components, etc., can solve the problems of flue gas poisoning to human body, low yield of chromium, component segregation, etc., and achieve high utilization rate of chromium raw materials, reduce The effect of high production cost and product quality

Active Publication Date: 2019-01-25
包头铝业有限公司 +1
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Problems solved by technology

The self-propagating aluminothermic reduction method is produced by using the principle that chromium oxide and aluminum automatically react at a certain temperature. The disadvantage of this method is: the combustion is violent during the production process, and the smoke generated has a certain poisonous effect on the human body; at the same time , the aluminothermic reduction method is to use chromium oxide as a raw material, use metal aluminum as a reducing agent, and produce aluminum-chromium alloy by reduction reaction at high temperature, but the alumina replaced by this method is slag, resulting in serious aluminum loss. Difficulty in removing slag, resulting in poor melt quality and serious defects in the produced Al-Cr alloy
There are two methods of mixing: one is to mix chromium additives containing chromium with pure aluminum. The chromium additives are composed of pure chromium and a combustion aid. The disadvantage of this method is that a large amount of smoke will be generated during the addition of chromium additives. Serious pollution is caused, while the chromium yield is low and the cost is high; the second is to use pure chromium and pure aluminum to mix, the disadvantage of this method is that the chromium yield is low, the composition segregation is serious, and the composition content is n

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  • Preparation method of aluminum-chromium alloy
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  • Preparation method of aluminum-chromium alloy

Examples

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Example Embodiment

[0032] Example 1: A method for preparing an aluminum-chromium alloy with a chromium content of 1% by mass. It is prepared in an aluminum electrolytic cell. The electrolytic cell used in this example is a pre-baked anode aluminum electrolytic cell, and the anode used is a carbon anode , The cathode is a graphite cathode, the electrolytic cell type is a cradle type cell, and the series current is 200KA; the chromium oxide in this embodiment is Cr 2 O 3 , Its purity is 99%. The technological conditions of the electrolysis cell are: the average voltage is 3.642V and the electrolysis temperature is 933°C.

[0033] The preparation method specifically includes the following steps:

[0034] Step 1: Measure the nNaF·AlF in the electrolyte of the aluminum reduction cell in the aluminum reduction cell being produced 3 , N is a constant of 2.1~2.9; KF; CaF 2 ; MgF 2 ; LiF; AL 2 O 3 The mass percentage content of which KF is 0.8%; CaF 2 5.1%; MgF 2 2.1%; LiF 5.5%; AL 2 O 3 5.2%; the balance is ...

Example Embodiment

[0073] Example 2: A method for preparing an aluminum-chromium alloy with a chromium content of 1% by mass. It is prepared in an aluminum electrolytic cell. The electrolytic cell used in this example is a pre-baked anode aluminum electrolytic cell, and the anode used is a carbon anode , The cathode is a graphite cathode, the electrolytic cell type is a cradle type cell, and the series current is 200KA; the chromium oxide in this embodiment is Cr 2 O 3 , Its purity is 99%. The technological conditions of the electrolysis cell are: the average voltage is 3.642V and the electrolysis temperature is 933°C.

[0074] The preparation method specifically includes the following steps:

[0075] Step 1: Measure the nNaF·AlF in the electrolyte of the aluminum reduction cell in the aluminum reduction cell being produced 3 ; KF; CaF 2 ; MgF 2 ; LiF; AL 2 O 3 The mass percentage content of KF is 4.1%; CaF 2 2.1%; MgF 2 4.8%; LiF 2.5%; AL 2 O 3 2.2%; the balance is cryolite nNaF·AlF 3 , N is 2.77, a...

Example Embodiment

[0078] Example 3: A method for preparing an aluminum-chromium alloy with a chromium content of 1% by mass. It is prepared in an aluminum electrolytic cell. The electrolytic cell used in this example is a pre-baked anode aluminum electrolytic cell, and the anode used is a carbon anode , The cathode is a graphite cathode, the electrolytic cell type is a cradle type cell, and the series current is 200KA; the chromium oxide in this embodiment is Cr 2 O 3 , Its purity is 99%. The technological conditions of the electrolysis cell are: the average voltage is 4.028V and the electrolysis temperature is 948°C.

[0079] The specific process steps are the same as in Example 1.

[0080] The aluminum-chromium alloy prepared by electrolysis in this embodiment has a chromium content deviation of less than 0.01% and a uniform composition; the actual raw material utilization rate of chromium oxide reaches 93.1%; the current efficiency is 91.2%; a single electrolytic cell can produce 1460kg per day ...

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Abstract

The invention provides a preparation method of aluminum-chromium alloy, in particular to a method for preparing aluminum-chromium alloy by electrolysis of chromium oxides which serve as the main raw material in an aluminium electrolysis cell. By the conventional aluminum electrolysis cell with pre-baked anode, industrially continuous production of aluminum-chromium alloy in batch is realized without adding of any other devices through the preparation method. The preparation method has the advantages that fluctuation in electrolysis production caused by strong reaction after adding of the raw material can be controlled within a reasonable range, content of chromium of the aluminum-chromium alloy can be controlled precisely and the utilization rate of the raw material of chromium oxides is high; the prepared aluminum-chromium alloy has the advantages of high content, low segregation and uniform component.

Description

Technical field: [0001] The invention relates to a method for preparing an aluminum-chromium alloy, in particular to a method for preparing an aluminum-chromium alloy by using an aluminum electrolytic cell. Background technique: [0002] At present, there are two main methods for the industrial production of Al-Cr alloys, namely the self-propagating thermite reduction method and the counter-mixing method. The self-propagating aluminothermic reduction method is produced by using the principle that chromium oxide and aluminum automatically react at a certain temperature. The disadvantage of this method is: the combustion is violent during the production process, and the smoke generated has a certain poisonous effect on the human body; at the same time , the aluminothermic reduction method is to use chromium oxide as a raw material, use metal aluminum as a reducing agent, and produce aluminum-chromium alloy by reduction reaction at high temperature, but the alumina replaced by ...

Claims

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Application Information

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IPC IPC(8): C25C7/06C25C7/02C25C3/36
CPCC25C3/36C25C7/025C25C7/06
Inventor 许晶柴永成于水沈利高宝堂刘彬赵云飞夏增立温瑞宇谢长青白洁李超群徐晓光
Owner 包头铝业有限公司
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