CN1394967A - Pure aluminium iron compound deoxidant and its production process - Google Patents

Abstract

The present invention relates to a pure aluminium iron composite deoxidant and its production process. It includes 30-70% of aluminium and 70-30% of iron, and its production process includes the following steps: (1). adopting aluminium-melting furnace to melt high-purity aluminium; (2) pouring the molten aluminium into the mould with frustum form, trapezoidal tower form or triangular tower form and forming, continuously heating the mould and making the molten aluminium be in liquid state; (3). quick adding preheated pure iron granules or iron chipings; and (4) lightly and slowly vibrating mould and making the iron granules or iron chipings uniformly dispersed in molten aluminium, solidifying to form aluminium-iron composition whose specific weight can be up to 2.8 g/cu.cm-6.8 g/cu.cm.

Description

Pure aluminium iron compound deoxidant and production technique thereof

Technical field:

The present invention relates to field of metallurgy, relate in particular to a kind of pure aluminium iron compound deoxidant, the invention still further relates to the production technique of this pure aluminium iron compound deoxidant.

Background technology:

For a long time, iron and steel enterprise is in smelting process, usually the alloy by metallic aluminium or ferro-aluminum remelting formation carries out composition adjustment and deoxidation, though these reductors increase deoxidation effect, but it is also undesirable, there are some insoluble problems, the main drawback of metallic aluminium reductor is that reaction is violent in deoxidation process, causes part aluminium to burn, and can not participate in the molten steel reaction and wastes, lighter because of its proportion on the other hand, can not sink to molten steel inside, less with the molten steel reaction interface, only limit to molten steel top or surface, thereby deoxidation effect is obviously reduced, and the recovery rate of aluminium is less.Though the ferroaluminium reductor that remelting generates has increased proportion, the alloy after melting has obviously changed the character of original metallic aluminium, and its fusing point is raise, and molten speed is slow excessively, is unfavorable for melting in molten steel, influences the recovery rate of aluminium, reduces deoxidation effect.

Summary of the invention:

The objective of the invention is the weak point at existing fine aluminium reductor and ferro-aluminum reductor, provide a kind of recovery rate high pure aluminium iron compound deoxidant, another object of the present invention provides the production technique of this pure aluminium iron compound deoxidant.

Technical scheme of the present invention is: a kind of pure aluminium iron compound deoxidant, it comprises the component of following weight proportion, aluminium 30-70%, iron 70-30%.

It also contains following component, Si Ca Mn Ba.

In order to produce pure aluminium iron compound deoxidant, the present invention adopts following steps:

(1) employingization aluminium stove technology melts raffinal earlier;

(2) aluminum solutions after will melting is cast to circular cone shape or bucking ladder shape or trilateral platform shape die for molding, continues mold heated is made it to be in liquid state;

(3) rapid pure iron grain or the iron bar that adds preheating in proportion;

(4) slight vibration mould is evenly dispersed in abrasive grit or iron bar and solidifies back formation ferro-aluminum composition in the aluminium liquid, finally makes product proportion reach 2.8g/cm ³～6.8g/cm ³

Technical scheme of the present invention is to utilize to add iron bar or abrasive grit formation ferro-aluminum composition in traditional aluminium deoxidizer; this ferro-aluminum composition can keep the low-melting characteristic of fine aluminium on the one hand; can increase proportion by abrasive grit or iron bar wherein again on the other hand, finally make product proportion reach 2.8g/cm ³～6.8g/cm ³It is sunk to be difficult for come-up in the steel, make aluminium can reach the effect of abundant deoxidation in molten steel, the recovery rate of aluminium is greatly improved than existing fine aluminium or ferro-aluminum remelting reductor, and the deoxidation cost of ton steel can reduce significantly.

Below prove the effect of technical solution of the present invention by test:

1, test objective

Utilization adds steel ball and increases proportion in traditional aluminium deoxidizer, it is sunk to be difficult for come-up in the steel.Aluminium can reach the effect of abundant deoxidation in molten steel, improve its rate of recovery.Adopt this method to be intended to save steel-making cost.Improve the recovery rate of aluminium.

2, test period: 19 to 21 April in 2002 (totally three days)

3, aluminium deoxidizer technical indicator contrast

Material type	Composition		Proportion (g/cm 3)	Shape
					????Al	Fe or other
	Existing material	??97％					??3％	????2.67	Particle
The test material			??33％	??67％	????5.00	Cone

4, test-results

Joining day	????Al	The stove number	Add-on (kg/t)	The rate of recovery (%)
						Sum	??Al
				With furnace charge	The test material			????4	????1.0	?14.0	?61.1
Vacuum arc	Existing material	????4	????1.0			?15.0	?16.0
				The deoxidation operation	The test material			????5	????1.0	?24.9	?73.2

5, note

(1) when adding fashionablely with furnace charge, the rate of recovery of Al reaches 61.6% in the test material.Using under the existence conditions situation, though it adds with furnace charge, Al can not dissolve fully and float, so its Al rate of recovery is lower than the test material.

(2) when in the vacuum arc operation, will test material and add ladle, the rate of recovery of Al improves 57.2% than existing material.

When the test material sinks in the ladle, cause its ascent rate to slow down owing to contain steel ball in the aluminium.Therefore, when floating on it between slag blanket, it is dissolving fully in molten steel, so the rate of recovery of Al can reach maximum.

6, conclusion

(1) adding with material and two kinds of processing methodes of vacuum arc deoxidation obtain in relatively, the rate of recovery of test material Al obviously is better than existingly expecting.

(2) the test material shows the rate of recovery that higher Al is arranged than existing material.Therefore, when the vacuum arc deoxidation is operated, owing to its high recovery rate is saved steel-making cost.

Description of drawings

Fig. 1 is first kind of structure vertical view of pure aluminium iron compound deoxidant piece;

Fig. 2 is the sectional view of Fig. 1 at the A-A face;

Fig. 3 is second kind of structural representation of pure aluminium iron compound deoxidant piece;

Fig. 4 is the sectional view of Fig. 3 at the B-B face;

Fig. 5 is the third structure vertical view of pure aluminium iron compound deoxidant piece;

Fig. 6 is the sectional view of Fig. 5 at the C-C face;

Fig. 7 is the 4th kind of structural representation of pure aluminium iron compound deoxidant piece.

Embodiment:

Embodiment 1 (weight percent)

Aluminium 30% iron 70%

Embodiment 2 (weight percent)

Aluminium 40% iron 60%

Embodiment 3 (weight percent)

Aluminium 50% iron 50%

Embodiment 4 (weight percent)

Aluminium 70% iron 30%

Embodiment 5 (weight percent)

Aluminium 33% iron 67%

Embodiment 6 (weight percent)

Aluminium 30% iron 60% Si2% Ca2% Mn2% Ba4%

The production technique of pure aluminium iron compound deoxidant: adopt following steps:

(1) employingization aluminium stove technology melts raffinal earlier;

(2) aluminum solutions after will melting is cast to circular cone shape or bucking ladder shape or trilateral platform shape die for molding, continues mold heated is made it to be in liquid state;

(3) rapid pure iron grain or the iron bar that adds preheating in proportion;

(4) slight vibration mould is evenly dispersed in abrasive grit or iron bar and solidifies back formation ferro-aluminum composition in the aluminium liquid, finally makes product proportion reach 2.8g/cm ³～6.8g/cm ³

In order further to improve the recovery rate of aluminium, after adding the pure iron grain of preheating or iron bar, reductor (3) step adds Si, Ca, Mn Ba element at once.

The structure of pure aluminium iron compound deoxidant piece such as Fig. 1, Fig. 2, Fig. 3, Fig. 4, Fig. 5 and shown in Figure 6, become circular cone shape such as Fig. 1 institute, shown in Figure 2 by die casting, in fine aluminium piece 1, be evenly distributed with iron bar 3 or abrasive grit 3, rectangular bucking ladder shape as shown in Figure 3, Figure 4, square bucking ladder shape such as Fig. 5, shown in Figure 6, trilateral platform shape as shown in Figure 7, respectively have a passage of being used to lead to 2 on thereon, deoxidizer block is made frustum following advantage is arranged: (1) is very easily sunk in the steel stove, can come-up contact with slag, gas to avoid scaling loss; (2) be easy to the demoulding in processing and the manufacturing processed; (3) have big contact interface with molten steel, accelerate molten speed, shorten the production time.Be used to be installed with a passage on the deoxidizer block upper and lower surface of frustum following effect is arranged: (1) is convenient to packing and transportation; (2) use its recovery rate of raising that can be bigger together according to the needs of production several piece of can connecting easily; (3) can further increase the contact interface of it and molten steel, quicken to conduct heat, be beneficial to the carrying out of metallurgical reaction, can significantly improve the recovery rate of aluminium.

Claims (7)

1, a kind of pure aluminium iron compound deoxidant is characterized in that, it comprises the component of following weight proportion, aluminium 30-70%, iron 70-30%.

2, pure aluminium iron compound deoxidant according to claim 1 is characterized in that, it also contains following component, Si Ca Mn Ba.

3, pure aluminium iron compound deoxidant according to claim 1 is characterized in that, the shape of reductor is circular cone shape or bucking ladder shape or trilateral platform shape.

4, pure aluminium iron compound deoxidant according to claim 3 is characterized in that, respectively has a through hole on the top and bottom of the frustum of a cone or bucking ladder or trilateral platform.

5, pure aluminium iron compound deoxidant according to claim 4 is characterized in that, above-mentioned bucking ladder is rectangular bucking ladder or square bucking ladder.

6, the technology of the described pure aluminium iron compound deoxidant of a kind of production claim 1 is characterized in that, adopts following steps:

(1) employingization aluminium stove technology melts raffinal earlier;

(2) aluminum solutions after will melting is cast to circular cone shape or bucking ladder shape or trilateral platform shape die for molding, continues mold heated is made it to be in liquid state;

(3) rapid pure iron grain or the iron bar that adds preheating in proportion;

(4) slight vibration mould is evenly dispersed in abrasive grit or iron bar and solidifies back formation ferro-aluminum composition in the aluminium liquid, finally makes product proportion reach 2.8g/cm ³～6.8g/cm ³

7, the production technique of pure aluminium iron compound deoxidant according to claim 6 is characterized in that, adds Si Ca Mn Ba element at once after (3) step adds the pure iron grain of preheating or iron bar.

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