A method for purifying an aluminum-titanium-boron alloy

Abstract

This invention relates to aluminum-titanium-boron alloy production technology and provides a purification method for aluminum-titanium-boron alloy production, comprising the following steps: (1) introducing an inert gas into the molten aluminum-titanium-boron alloy and simultaneously spraying in a purifying substance A; wherein the composition of purifying substance A is 10-20% cryolite, 25-35% sodium chloride, 25-30% sodium sulfate, 15-25% sodium fluorosilicate, and 20-25% sodium nitrate; (2) 3-4 minutes after the purifying substance A is sprayed, spraying in a purifying substance B; wherein the composition of purifying substance B is 40-50% sodium fluorosilicate, 15-20% sodium nitrate, 15-20% sodium carbonate, and 10-20% calcium fluoride; (3) after both purifying substances A and B have been sprayed, spraying in a slagging agent into the molten aluminum-titanium-boron alloy, and after settling, skimming off the scum. The purpose of this invention is to provide a purification method for aluminum-titanium-boron alloy production, which can more efficiently and thoroughly remove impurities from the aluminum-titanium-boron alloy.

Description

Technical Field

[0001] This invention relates to the technical field of aluminum-titanium-boron alloy production, and more specifically, to a purification method for aluminum-titanium-boron alloy production. Background Technology

[0002] Aluminum-titanium-boron master alloy is currently the most widely used aluminum alloy refining agent. More than 75% of the aluminum industry uses aluminum-titanium-boron refining agents. Compared with foreign products, the quality of aluminum-titanium-boron refining agents produced in my country is somewhat inferior. The main problem is that the TiAl3 distribution in the aluminum-titanium-boron refining agent is not uniform enough, and the TiB2 particles are large and unevenly distributed, with serious segregation, which affects the product qualification rate.

[0003] One process for producing aluminum-titanium-boron master alloys involves adding potassium fluorotitanate and potassium fluoroborate in a specific ratio to molten aluminum at high temperatures. This process consumes aluminum to displace titanium and boron, forming titanium-boron compounds, while simultaneously generating potassium fluoroaluminate. Potassium fluoroaluminate and other slag adhere to the aluminum alloy, lowering the product's grade. Reducing slag and other impurities is a key indicator for improving aluminum-titanium-boron product quality. Summary of the Invention

[0004] The purpose of this invention is to provide a purification method for the production of aluminum-titanium-boron alloys, which can remove impurities from the aluminum-titanium-boron alloys more efficiently and thoroughly.

[0005] The embodiments of the present invention are achieved through the following technical solution: The purification method for producing aluminum-titanium-boron alloys of the present invention includes the following operation steps:

[0006] (1) Inert gas is introduced into the molten aluminum-titanium-boron alloy, and purification substance A is sprayed in at the same time; by weight, the composition of purification substance A is 10-20% cryolite, 25-35% sodium chloride, 25-30% sodium sulfate, 15-25% sodium fluorosilicate, and 20-25% sodium nitrate.

[0007] (2) When the purification substance A is sprayed for 3-4 minutes, the purification substance B is sprayed into the aluminum-titanium-boron alloy molten liquid; by weight, the composition of the purification substance B is 40-50% sodium fluorosilicate, 15-20% sodium nitrate, 15-20% sodium carbonate, and 10-20% calcium fluoride.

[0008] (3) After both purification substances A and B are sprayed, a slag remover is sprayed into the molten aluminum-titanium-boron alloy. After standing, the slag is skimmed off.

[0009] Furthermore, the amount of purifying substance A added to each ton of aluminum-titanium-boron alloy molten liquid is 1-2 kg. The injection time of purifying substance A is 6-8 minutes.

[0010] Furthermore, the amount of purifying substance A added to each ton of aluminum-titanium-boron alloy molten liquid is 1-1.5 kg. The injection time of the purifying substance B is 3-4 minutes.

[0011] Furthermore, in steps (1)-(3), the temperature of the aluminum-titanium-boron alloy melt is controlled at 720-780℃.

[0012] Furthermore, the slag remover in step (3) consists of 25-35% sodium chloride, 25-30% sodium sulfate, 10-20% sodium fluorosilicate, and 15-40% sodium nitrate. The amount of slag remover added to each ton of aluminum-titanium-boron alloy molten liquid is 2-4 kg.

[0013] The technical solution of this invention has at least the following advantages and beneficial effects: The purification method for producing aluminum-titanium-boron alloys of this invention introduces a large amount of inert gas (nitrogen, argon, etc.) into the molten aluminum-titanium-boron alloy, making the alloy liquid flow. At this time, purification substances A and B are sprayed into it, so that purification substances A and B can not only be fully dispersed in the alloy liquid, but also displace impurities such as potassium fluoroaluminate. This makes it easier for scum and impurities such as potassium fluoroaluminate to separate from the aluminum-titanium-boron alloy solution in the flowing alloy solution, thereby improving the removal of scum and impurities, significantly increasing the amount of scum and impurities removed, improving product quality, and improving the removal efficiency. Detailed Implementation

[0014] Example 1

[0015] This embodiment provides a purification method for the production of aluminum-titanium-boron alloys, including the following steps:

[0016] Argon gas is introduced into the molten aluminum-titanium-boron alloy at 750℃, and simultaneously, purifying substance A is injected into the alloy liquid within 6 minutes. The composition of purifying substance A is (mass fraction, the same below): cryolite 10%, sodium chloride 25%, sodium sulfate 25%, sodium fluorosilicate 15%, and sodium nitrate 25%. The injection rate of purifying substance A is 1 kg per ton of alloy liquid.

[0017] (2) Three minutes after the purification substance A is sprayed, purification substance B is simultaneously sprayed into the aluminum-titanium-boron alloy molten liquid within three minutes; wherein the composition of purification substance B is 40% sodium fluorosilicate, 20% sodium nitrate, 20% sodium carbonate, and 20% calcium fluoride; the amount of purification substance B sprayed is 1 kg per ton of alloy liquid.

[0018] (3) After both purifying substances A and B are sprayed, let it stand for 10 minutes, then spray the slag remover into the aluminum-titanium-boron alloy molten liquid. After standing, skim off the slag. The slag remover consists of 25% sodium chloride, 25% sodium sulfate, 10% sodium fluorosilicate, and 40% sodium nitrate. The amount of slag remover added to each ton of aluminum-titanium-boron alloy molten liquid is 2 kg.

[0019] Example 2

[0020] This embodiment provides a purification method for the production of aluminum-titanium-boron alloys, including the following steps:

[0021] Argon gas is introduced into the molten aluminum-titanium-boron alloy at 780℃, and simultaneously, purifying substance A is injected into the alloy liquid within 8 minutes. The composition of purifying substance A is (mass fraction, the same below): cryolite 10%, sodium chloride 25%, sodium sulfate 25%, sodium fluorosilicate 15%, and sodium nitrate 25%. The injection rate of purifying substance A is 1 kg per ton of alloy liquid.

[0022] (2) Four minutes after the purification substance A is sprayed, purification substance B is simultaneously sprayed into the aluminum-titanium-boron alloy molten liquid within four minutes; wherein the composition of purification substance B is 40% sodium fluorosilicate, 20% sodium nitrate, 20% sodium carbonate, and 20% calcium fluoride; the amount of purification substance B sprayed is 1 kg per ton of alloy liquid.

[0023] (3) After both purifying substances A and B are sprayed, let it stand for 10 minutes, then spray the slag remover into the aluminum-titanium-boron alloy molten liquid. After standing, skim off the slag. The slag remover consists of 25% sodium chloride, 25% sodium sulfate, 10% sodium fluorosilicate, and 40% sodium nitrate. The amount of slag remover added to each ton of aluminum-titanium-boron alloy molten liquid is 2 kg.

[0024] Example 3

[0025] This embodiment provides a purification method for the production of aluminum-titanium-boron alloys, including the following steps:

[0026] Argon gas is introduced into the molten aluminum-titanium-boron alloy at 750℃, and simultaneously, purifying substance A is injected into the alloy liquid within 6 minutes. The composition of purifying substance A is (mass fraction, the same below): cryolite 10%, sodium chloride 25%, sodium sulfate 25%, sodium fluorosilicate 15%, and sodium nitrate 25%. The injection rate of purifying substance A is 2 kg per ton of alloy liquid.

[0027] (2) Three minutes after the purification substance A is sprayed, purification substance B is simultaneously sprayed into the aluminum-titanium-boron alloy molten liquid within three minutes; wherein the composition of purification substance B is 40% sodium fluorosilicate, 20% sodium nitrate, 20% sodium carbonate, and 20% calcium fluoride; the amount of purification substance B sprayed is 1.5 kg / ton of alloy liquid.

[0028] (3) After both purifying substances A and B are sprayed, let it stand for 10 minutes, then spray the slag remover into the aluminum-titanium-boron alloy molten liquid. After standing, skim off the slag. The slag remover consists of 25% sodium chloride, 25% sodium sulfate, 10% sodium fluorosilicate, and 40% sodium nitrate. The amount of slag remover added to each ton of aluminum-titanium-boron alloy molten liquid is 2 kg.

[0029] The above are merely preferred embodiments of the present invention and are not intended to limit the present invention. Various modifications and variations can be made to the present invention by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the scope of protection of the present invention.

Claims

1. A purification method for the production of aluminum-titanium-boron alloys, characterized in that, The following steps are included: (1) Inert gas is introduced into the molten aluminum-titanium-boron alloy, and purification substance A is sprayed in at the same time; by weight, the composition of purification substance A is 10-20% cryolite, 25-35% sodium chloride, 25-30% sodium sulfate, 15-25% sodium fluorosilicate, and 20-25% sodium nitrate; (2) When the purifying substance A is sprayed in for 3-4 minutes, the purifying substance B is sprayed into the aluminum-titanium-boron alloy molten liquid; by weight, the composition of the purifying substance B is 40-50% sodium fluorosilicate, 15-20% sodium nitrate, 15-20% sodium carbonate, and 10-20% calcium fluoride; (3) After both purification substances A and B are sprayed, spray the slag remover into the aluminum-titanium-boron alloy molten liquid, let it stand, and then remove the slag. The slag remover in step (3) consists of 25-35% sodium chloride, 25-30% sodium sulfate, 10-20% sodium fluorosilicate, and 15-40% sodium nitrate.

2. The purification method for producing aluminum-titanium-boron alloys according to claim 1, characterized in that, The amount of purifying substance A added per ton of aluminum-titanium-boron alloy molten liquid is 1-2 kg.

3. The purification method for producing aluminum-titanium-boron alloys according to claim 1, characterized in that, The injection time of the purifying substance A is 6-8 minutes.

4. The purification method for producing aluminum-titanium-boron alloys according to claim 1, characterized in that, The amount of purifying substance A added per ton of aluminum-titanium-boron alloy molten liquid is 1-1.5 kg.

5. The purification method for producing aluminum-titanium-boron alloys according to claim 1, characterized in that, The injection time of the purifying substance B is 3-4 minutes.

6. The purification method for producing aluminum-titanium-boron alloys according to claim 1, characterized in that, In steps (1)-(3), the temperature of the aluminum-titanium-boron alloy melt is controlled at 720-780℃.

7. The purification method for producing aluminum-titanium-boron alloys according to claim 1, characterized in that, The amount of slag remover added per ton of aluminum-titanium-boron alloy molten liquid is 2-4 kg.