CN111910046A

CN111910046A - Strong-deoxidation high-purity aluminum-iron alloy and preparation method thereof

Info

Publication number: CN111910046A
Application number: CN201910384947.XA
Authority: CN
Inventors: 张海奇; 于国民; 谢鹏飞
Original assignee: Changzhou Sunai Alloy Co ltd
Current assignee: Changzhou Sunai Alloy Co ltd
Priority date: 2019-05-09
Filing date: 2019-05-09
Publication date: 2020-11-10

Abstract

The invention relates to a strong deoxidation high-purity aluminum-iron alloy and a preparation method thereof, wherein the selected aluminum raw material is a treated waste aluminum material, and the selected iron raw material is high-purity reduced iron powder, wherein the carbon content is less than 0.35%, the hydrogen content is less than 0.2%, the nitrogen content is less than 4%, and the oxygen content is less than 3%. The preparation method comprises the steps of crushing the aluminum alloy cleaned by the waste to form aluminum scraps; then smelting the high-purity reduced iron powder to form pure iron liquid, and adding a layer of Na on the surface of the pure iron liquid₃ALF₆A refining agent; 1/3 aluminum scraps are added into the pure iron liquid, and the pure iron liquid is properly stirred without slagging off; continuously adding aluminum scraps to most of the furnace, and still stirring properly without slagging off; quickly adding the rest aluminum scraps for the third time, and immediately stirring without slagging off after melting; then adding a covering agent, and heating to 1200 ℃; and finally, discharging and pouring are finished, and a small-granularity model is used.The invention adopts the waste aluminum material as the raw material, and can greatly reduce the production cost on the premise of not reducing the product quality.

Description

Strong-deoxidation high-purity aluminum-iron alloy and preparation method thereof

Technical Field

The invention relates to the technical field of aluminum-iron alloy reducing agents, in particular to a strong-deoxidation high-purity aluminum-iron alloy and a preparation method thereof.

Background

In the smelting process of the steel, after chemical components are qualified, a deoxidizer is added for deoxidation before tapping, so that the brittleness of the steel is reduced, and the shaping and flexibility of the steel are improved. The traditional aluminum-iron alloy preparation process has more impurities, if the aluminum-iron alloy with higher purity needs to be prepared, the high-purity aluminum ingot raw material needs to be used, the production cost is too high, and in fact, China has a large amount of waste aluminum alloy materials, most of the aluminum alloy materials are applied to low-quality products after being recycled, and the aluminum alloy materials cannot be really recycled with high quality. In recent years, our company has been devoted to recycling of scrap, and a method of obtaining a high-quality aluminum raw material from scrap aluminum materials has been obtained.

Disclosure of Invention

In order to solve the problems of low purity and high production cost of the existing aluminum-iron alloy, the invention provides an aluminum-iron alloy product with high purity, low cost and super strong deoxidation and reducibility and a preparation method thereof, and the specific technical scheme is as follows:

a strong deoxidation high-purity aluminum-iron alloy is prepared from the treated waste aluminum material as aluminum raw material and high-purity reduced iron powder as iron raw material, wherein the carbon content is less than 0.35%, the hydrogen content is less than 0.2%, the nitrogen content is less than 4%, and the oxygen content is less than 3%.

The preparation method of the strong deoxidation high-purity aluminum-iron alloy comprises the following steps:

s1, crushing the aluminum alloy cleaned by the waste to form aluminum scraps;

s2, smelting the high-purity reduced iron powder to form pure iron liquid;

s3, uniformly covering a layer of Na on the surface of the pure molten iron₃ALF₆A refining agent; the use of the refining agent is not necessary in general, from 3 late months to 6 early months in a year, in the middle of 4-5 months, the difficulty in producing aluminum iron is high, and Na can be properly used₃ALF₆And (4) a refining agent. The aim is to remove the impurities in the liquid aluminum-iron, so as to prevent the impurities from damaging aluminum-iron crystal lattices and improve the weathering strength of the product. Due to Na₃ALF₆The melting point is 1025 ℃ lower than the tapping temperature, and the two-phase material is immiscible with the metal liquid, so Na can be added₃ALF₆Adding into the bag by pouring. The density of the aluminum-iron composite material is lower than that of aluminum-iron, the aluminum-iron composite material can float upwards automatically, and large particles are generated by combining with impurities in the floating process, so that the liquid aluminum-iron composite material is beneficial to purifying liquid aluminum-iron.

S4, adding 1/3 aluminum scraps into the pure iron liquid, and properly stirring without slagging off; because the liquid level is lower at the moment, the contact probability with air is low, slag is not removed when the mixture is properly stirred, and the principle that the furnace bottom is not frozen is adopted;

s5, continuously adding the aluminum skimmings to the majority of the furnace, and still stirring properly without slagging off; the liquid level in the furnace is 1/2-1/3 away from the upper part of the furnace, the molten metal is properly stirred without slagging off, and the metal liquid in the furnace is properly overheated to ensure the temperature for adding aluminum next time;

s6, quickly adding the residual aluminum scraps, and immediately stirring without slagging off after melting; the third aluminum scrap adding is key and has high speed;

s7, adding a covering agent on the surface of the melt;

s8, heating to 1200 ℃;

and S9, finally, discharging and casting are finished, and a small-granularity model is used.

Further, the covering agent is industrial salt.

Further, Na₃ALF₆The covering thickness of the refining agent is 5-12mm on average.

Further, the preparation method of the aluminum scrap in the step S1 is to prepare the aluminum scrap by crushing, screening and grading, removing miscellaneous wastes, and ball milling.

The invention has the beneficial effects that: can obviously reduce the production cost of Jiangsu on the premise of ensuring the purity and strong reducibility of the aluminum-iron alloy.

Detailed Description

s1, crushing the aluminum alloy cleaned by the waste to form aluminum scraps; the preparation method of the aluminum skimmings comprises the steps of crushing, screening and grading, removing miscellaneous wastes, and ball milling to prepare the aluminum skimmings;

s2, smelting the high-purity reduced iron powder to form pure iron liquid; before smelting, the steamed stuffed bun needs to be preheated to more than 900 ℃, the color of the steamed stuffed bun wall is peach red visually, a casting model needs to be preheated to more than 200 ℃ before production, and saliva can be used for temperature detection.

S3, surface treatment of pure molten ironUniformly covering a layer of Na₃ALF₆A refining agent; na (Na)₃ALF₆The average covering thickness of the refining agent is 5-12 mm; s4, adding 1/3 aluminum scraps into the pure iron liquid, and properly stirring without slagging off; because the liquid level is lower at the moment, the contact probability with air is low, slag is not removed when the mixture is properly stirred, and the principle that the furnace bottom is not frozen is adopted;

s7, adding a covering agent on the surface of the melt, wherein the covering agent is industrial salt;

s8, heating to 1200 ℃;

s9, finally, discharging and pouring are completed, a small-particle-size model is used, the liquid flow length is accelerated and shortened as far as possible, a ladle opening is close to a water outlet when the liquid is discharged, small-packet pouring can be adopted, the small-particle-size model is used instead, and the mass ratio of the model to pouring liquid reaches 15: 1 or more is preferable to accelerate the cooling speed after casting, so that the crystal grains are refined, and the intercrystalline bonding strength is improved.

Claims

1. A strong deoxidation high-purity aluminum-iron alloy is characterized in that: the selected aluminum raw material is a treated waste aluminum material, and the selected iron raw material is high-purity reduced iron powder, wherein the carbon content is less than 0.35%, the hydrogen content is less than 0.2%, the nitrogen content is less than 4%, and the oxygen content is less than 3%.

2. The method of claim 1, comprising the steps of:

s1, crushing the aluminum alloy cleaned by the waste to form aluminum scraps;

s2, smelting the high-purity reduced iron powder to form pure iron liquid;

s3, uniformly covering a layer of Na on the surface of the pure molten iron₃ALF₆A refining agent;

s4, adding 1/3 aluminum scraps into the pure iron liquid, and properly stirring without slagging off;

s5, continuously adding the aluminum skimmings to the majority of the furnace, and still stirring properly without slagging off;

s6, quickly adding the residual aluminum scraps, and immediately stirring without slagging off after melting;

s7, adding a covering agent on the surface of the melt;

s8, heating to 1200 ℃;

3. The method of claim 2, wherein the aluminum-iron alloy is prepared by the following steps: the covering agent is industrial salt.

4. The method of claim 2, wherein the aluminum-iron alloy is prepared by the following steps: na (Na)₃ALF₆The covering thickness of the refining agent is 5-12mm on average.

5. The method of claim 2, wherein the aluminum-iron alloy is prepared by the following steps: the preparation method of the aluminum skimmings in the step S1 is to prepare the aluminum skimmings by crushing, screening and grading, removing miscellaneous wastes and ball milling.