CN1259456C - Method of directly preparing aluminium cerium internediate alloy using fused salt elactrolysis method - Google Patents

Abstract

The present invention belongs to the preparation method field for aluminum metal by an electrolysis method, particularly to a fused salt electrolysis method for directly preparing the alloy of aluminium and cerium. The aluminium liquid of rare earth alloy is directly prepared by fused salt electrolysis. Pure cerium oxide rare earth is directly added in an electrolytic tank and is carried out with a chemical reaction through fused salt electrolysis to make cerium directly dissolved in aluminium liquid in an electrolytic process. Rare earth alloy containing cerium of over 10 % is prepared. The present invention has the advantages of simpleness, convenient use and stable electrolysis production of aluminum, is a good method for adding rare earth in production of alloy and can be welcomed by manufacturers.

Description

Fused salt electrolysis process directly prepares the method for aluminium cerium master alloy

One, technical field:

The invention belongs to aluminum metal electrolytic process preparation method field, relate to the method that a kind of fused salt electrolysis process directly prepares aluminium cerium master alloy specifically.

Two, background technology:

At present, domestic production aluminium cerium master alloy mainly is to adopt mishmetal to prepare the low levels master alloy, directly adds rare earth metal and prepare alloy aluminum liquid in aluminium liquid, this method composition is wayward, during use, the casting yield instability, end product quality should not guarantee; Also there is the fused salt electrolysis process of employing directly to prepare the mishmetal aluminium alloy, but content of rare earth can only be controlled at about 5%, and this method is produced and is caused the aluminium cell technology condition to change easily, cause electrolyzer efficient low, to the demanding rare earth alloy product of content of rare earth, use and be inconvenient to cause the high deficiency of cost simultaneously.

Three, summary of the invention:

The objective of the invention is to adopt in aluminium cell and to add the method that a kind of fused salt electrolysis process that the pure zirconia cerium mischmetal carries out fused salt electrolysis directly prepares aluminium cerium master alloy.

The objective of the invention is to realize by following technical scheme:

A kind of fused salt electrolysis process directly prepares the method for aluminium cerium master alloy, comprise: the control of the interpolation content of pure zirconia cerium mischmetal and addition means, electrolyzer temperature, the control of electrolyte ingredient, the setting of voltage, go up lower horizontal control, the furnace bottom pressure drop controls, its characteristics are:

(1), adopts the method for directly adding the pure zirconia cerium mischmetal on the groove face; Make the content of cerium oxide rare earth in groove reach 2-4% in one week, make the content of cerium oxide rare earth in groove reach 6-7% in two weeks, make the content of cerium oxide rare earth in groove reach 8-10% in three weeks, the content of cerium oxide rare earth in groove is reached more than 10%;

(2), bath voltage is controlled at 4.25-4.45V;

(3), go up lower horizontal control: the level of going up is controlled at 12-18cm, level is controlled at 32-38cm down;

(4), electrolyzer temperature is controlled at 940-965 ℃;

(5), the stove low pressure drop is controlled at below the 500mv;

(6), the electrolyte ingredient aluminum fluoride is controlled at 27-28 kilogram/ton aluminium.

Produce aluminium cerium master alloy aluminium ingot rare earth cerium content more than 10%.

Adopt fused salt electrolysis process of the present invention directly to prepare aluminium cerium master alloy, but direct production aluminium cerium mischmetal alloy aluminum liquid, directly be prepared into aluminium cerium intermediate alloy ingot, be convenient to add in the next procedure configuration that rare earth alloy is produced, aluminium cerium mischmetal alloy content can be controlled in more than 10% simultaneously, produce the cerium mischmetal alloy that contains more than 10%, the preparation method is simple and direct, and is easy to use, and Aluminium Electrolysis is steady, be a kind of better method of adding rare earth in the alloy production, can be subjected to the welcome of manufacturer surely.

Four, embodiment:

Embodiment:

My company adds the pure zirconia cerium mischmetal and produces aluminium cerium master alloy in electrolyzer, at first bath voltage is set at 4.5-4.6V, the groove temperature control is at 950-975 ℃, electrolyte level is adjusted into 16-18cm, the aluminium horizontal adjustment is 32-35cm, the cleaning furnace bottom, the furnace bottom volts lost is controlled at below the 500mV, adjust electrolyte ingredient, molecular ratio is controlled between the 2.6-2.7, directly add rare earth cerium oxide 75Kg on the shell face is concentrated every day like this, content of rare earth reaches 3-4% after the week, and content of rare earth reaches more than 10% in one month.During this period: electrolyte ingredient is relatively poor, and the carbon slag is difficult for dividing high and more sticking, and ionogen shrinks, and the interior rare precipitation of groove is more but furnace bottom is not long; In order to improve electrolyte ingredient and electrolyzer operation conditions, progressively adjust the setting of rare earth addition means and processing parameter, addition methods changes to concentrate to add to change into disperses to add, bath voltage is controlled at 4.25-4.45V, go up lower horizontal control, level is controlled at 12-18cm in the requirement, and following level is controlled at 32-38cm, and electrolyzer temperature is controlled at 940-965 ℃.After one week, electrolyte ingredient and electrolyzer operation conditions all are improved, and it is good that every processing parameter all keeps.

Fused salt electrolysis process directly prepares aluminium cerium master alloy technology conclusion:

1, groove thorax operational excellence: the groove thorax is in the past regular, and four jiaos well-balanced, the furnace bottom cleaning;

2, every processing parameter keeps good, and the furnace bottom pressure drop decreases more in the past, the easier maintenance of level up and down;

3, each economic target all keeps good: current efficiency improves 0.2-0.5%;

4, dose situation with mishmetal and compare, pure rare earth content is equivalent to two times of mishmetal content, other as: electrolyzer operation conditions, parameters and voltage all are better than mishmetal and dose groove.

Claims (2)

1, a kind of fused salt electrolysis process directly prepares the method for aluminium cerium master alloy, comprise: the control of the interpolation mass content of pure zirconia cerium mischmetal and addition means, electrolyzer temperature, the control of electrolyte ingredient, the setting of voltage, go up lower horizontal control, the furnace bottom pressure drop controls is characterized in that:

(1), adopts the method for directly adding the pure zirconia cerium mischmetal on the groove face; Directly concentrate every day and add the cerium oxide rare earth at the shell face, make the mass content of cerium oxide rare earth in groove reach 2-4% in one week, make the mass content of cerium oxide rare earth in groove reach 6-7% in two weeks, make the mass content of cerium oxide rare earth in groove reach 8-10% in three weeks, the mass content of cerium oxide rare earth in groove reached more than 10%;

(2), bath voltage is controlled at 4.25-4.45V;

(3), go up lower horizontal control: the level of going up is controlled at 12-18cm, level is controlled at 32-38cm down;

(4), electrolyzer temperature is controlled at 940-965 ℃;

(5), the furnace bottom pressure drop is controlled at below the 500mv;

(6), the electrolyte ingredient aluminum fluoride is controlled at 27-28 kilogram/ton aluminium.

2, a kind of fused salt electrolysis process according to claim 1 directly prepares the method for aluminium cerium master alloy, it is characterized in that: produce aluminium cerium master alloy aluminium ingot, rare earth cerium mass content is more than 10%.