JPH0790346A - Manufacture of aluminum deoxidizer - Google Patents

Abstract

PURPOSE:To provide a manufacturing method of aluminum deoxidizer, with which the melting process can be dispensed with and the manufacturing cost can be reduced. CONSTITUTION:Uncontinuous body such as small pieces, divided pieces, powder, grain of aluminum, or the mixture of this uncontinuous body with other metal or substance containing aluminum is charged into a forming die, and the compressive stress is added, and at the same time, the vibration is given to the direction orthogonal to the direction where this compressive stress is given to make a formed body, and continuous metallic aluminum phase is formed in the formed body. This constitution forms the continuous metallic aluminum phase with no formation of its oxide film, realizes rapid reaction with the molten steel, and provides the aluminum deoxidizer with high deoxidizing effect in the cold forming by one process.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for producing an aluminum deoxidizer used in a steelmaking process performed in a converter, an electric furnace, an open hearth furnace or the like.

[0002]

2. Description of the Related Art A deoxidizing treatment is indispensable in the steelmaking process, and shot aluminum having a small grain shape or bunker aluminum having a trapezoidal shape or a relatively large semicircular cross section has been conventionally used as a deoxidizing agent.

These aluminum deoxidizers are manufactured by melting new aluminum ingot or aluminum scrap, dropping molten aluminum on a cooling plate and rapidly solidifying it in a granular manner, or intermittently using molten aluminum in a mold. It was performed by a method of injecting and solidifying into a predetermined shape. However, all of the above methods easily oxidize aluminum, and a thick oxide film is formed on the surface of the obtained aluminum deoxidizer, so when it is added to molten steel as a deoxidizer, the reaction with oxygen in the steel is slow. ,
The problem is that the reaction takes time. Further, the cost is increased because the aluminum is melted, and the melting loss is generated, which causes the cost increase.

[0004] Waste aluminum alloy is made into a strip shape, the surface is heated to a semi-molten state, and it is pressed to form a gapped aluminum block to accelerate the reaction with molten steel and use waste aluminum to reduce the cost. A method for producing an aluminum deoxidizer intended to achieve this is also proposed (Japanese Patent Publication No. 63-58883), but an oxide film is formed at the stage of pressure-molding aluminum that has been heated to a semi-molten state. Inevitable.

Further, molten aluminum is cast into a rod shape,
After cooling, it is cut with a cutter to make an aluminum material with a cut surface on the outer surface, and the oxide film on the outer surface formed during solidification of molten aluminum is removed at the cut surface to accelerate the reaction with molten steel. A method for manufacturing a deoxidized aluminum processed product has been proposed (Japanese Patent Publication No. 1-40884).
The cost increase associated with melting aluminum is unavoidable.

[0006]

The present invention has been made to solve the above-mentioned conventional problems in the production of an aluminum deoxidizer, and its object is to achieve a specific cold temperature without melting aluminum. An object of the present invention is to provide a method for producing an aluminum deoxidizer, which economically obtains an aluminum deoxidizer having a large deoxidizing effect without an oxide film on the outer surface by processing.

[0007]

The method for producing an aluminum deoxidizing agent according to the present invention for achieving the above object comprises a discontinuous body such as aluminum strips, fragments, powders and granules, or A mixture of a discontinuous body and another metal or an aluminum-containing substance is charged into a molding die to apply compressive stress, and at the same time, vibration is applied in a direction perpendicular to the direction in which the compressive stress is applied to form a molded body. Forming a continuous metallic aluminum phase in the molded body is a feature of the present invention.

Aluminum strip applied to the present invention,
Fragments, powders, discontinuities such as granules may be prepared for that purpose, but it is necessary to use cutting chips, cutting chips, and aluminum dalai containing these generated in the aluminum material manufacturing process and molding process. It can be used separately according to need.
The aluminum pieces, fractions, powders, and granules may be used alone, or may be used as a mixture thereof, and other metals such as magnesium and manganese that enhance deoxidizing power may be used. , Chromium, titanium, silicon, zirconium,
Powders such as boron or aluminum-containing substances such as aluminum slag containing metallic aluminum may be mixed and used.

The above discontinuous aluminum body is washed by a known method and then dried, or dried without washing, and if necessary, other substances are mixed and placed in a molding die of a predetermined shape. Charge and apply compressive stress. The present invention is characterized in that during the application of compressive stress, vibration is applied to the molding die in a direction perpendicular to the direction in which the compressive stress is applied. The vibration is given by mechanical vibration, ultrasonic vibration, electric vibration due to high frequency, etc., and the aluminum material in the molding die is compression-molded while vibrating. By such a molding process, the aluminum material in the molding die is not only mechanically bonded, but a continuous metal phase is formed between the materials, and the materials are metallurgically bonded.

The produced aluminum deoxidizer has a surface having a metallic luster due to metallic aluminum, and the material is sufficiently plastically deformed by the main forming process to form a continuous metallic aluminum phase between adjacent materials, which is metallurgical. It indicates that binding has occurred. The processing surface of the molding die may be divided into the shape of the aluminum deoxidizing agent to be obtained, and a rod-shaped or plate-shaped aluminum deoxidizing agent is molded by the molding die, and the aluminum deoxidizing agent is used. It can also be divided by a method suitable for the shape of the agent.

[0011]

In the method for producing an aluminum deoxidizer according to the present invention, a material mainly composed of a discontinuous body of aluminum is cold-formed by a combination of compressive stress and vibration in the direction perpendicular to the compressive stress and Since the air in the material is efficiently removed by these synergistic effects, the material is uniformly filled in the molding die, and the shear force acts between the materials to divide the oxide film on the surface of the material, resulting in continuous metal. An aluminum deoxidizer that forms an aluminum phase, has a metallic aluminum luster on the surface, has no oxide film on the surface, and can react quickly and effectively with molten steel when added to molten steel in one step. To be

[0012]

EXAMPLES Examples of the present invention will be described below. Example 1 After the metal aluminum cutting chips were dried, a press designed to perform compression molding while applying vibration was used to load the cutting chips into a horizontally set molding die (diameter 30 mm x height 75 mm). Insert and apply a compressive load of 15 tons / piece (one cutting scrap loaded in the forming die) in the vertical direction, and at the same time, make the forming die by slightly vibrating in the horizontal direction for forming and deoxidizing aluminum. An agent (30mm diameter x 40mm) was manufactured. The surface of the obtained aluminum deoxidizer has a metallic luster of aluminum, and test pieces were taken from several points of the molded aluminum deoxidizer and observed under a microscope. An aluminum phase was formed and no oxide film was formed.

Example 2 Aluminum powder (10 to 150 mesh) was added to Example 1
Aluminum deoxidizer (30mm diameter x 40mm) is formed by applying a compression load of 12 tons / piece using the press and molding die of
Was produced. The surface of the obtained aluminum deoxidizer has a metallic luster of aluminum, and test pieces were taken from several points of the molded aluminum deoxidizer and observed under a microscope. An aluminum phase was formed and no oxide film was observed.

Example 3 Cut wire of dried aluminum (diameter 1-3 mm)
With magnesium, zirconium and boron powder
Mix 0.3%, and use the same press as in Example 1, and apply 15 tons / vertical force in the vertical direction while applying horizontal vibration to the molding die.
A compression load of a book is added to the molding process, and the aluminum deoxidizer (30 m
Multiple m diameter x 40 mm) were manufactured. The surface of the obtained aluminum deoxidizer has a metallic luster of aluminum, and test pieces were taken from several points of the molded aluminum deoxidizer and observed under a microscope. An aluminum phase was formed and no oxide film was observed.

[0015]

As described above, according to the present invention, a material mainly composed of discontinuous bodies such as metal strips, fragments, powders, and granules is cold-formed in one step to obtain a surface. Since a continuous metal aluminum phase is formed on the aluminum deoxidizer without an oxide film, the reaction with molten steel can be rapidly performed to enhance the deoxidizing effect. Since no melting step is involved, the manufacturing cost can be reduced, which is extremely useful in industry.

Claims (1)

[Claims] 1. A compressive stress is obtained by charging a discontinuous body such as aluminum strips, fragments, powders, and granules, or a mixture of the discontinuous body and another metal or an aluminum-containing substance into a molding die. The method for producing an aluminum deoxidizing agent is characterized in that a molded body is formed by simultaneously vibrating in the direction perpendicular to the direction in which the compressive stress is applied, and a continuous metal aluminum phase is formed in the molded body.