JPS6358883B2 - - Google Patents

Description

[Detailed description of the invention]

[Purpose of the invention] (Field of industrial application) The present invention is an economical deoxidizing agent that utilizes waste aluminum and has a strong deoxidizing ability for use in steelmaking processes such as converters, electric furnaces, and open hearths. The present invention provides an aluminum deoxidizer and a method for producing the same. (Prior Art) Initially, new ingots made by melting and casting new aluminum ingots were used as deoxidizers used in converters, electric furnaces, etc. during steel manufacturing. However, due to the demands of the times to reduce costs, a method of recycling aluminum by melting it and using it as a recycled product has emerged, and with the support of improvements in deoxidizing technology, this method has recently become mainstream. ing. However, in today's world where aluminum prices fluctuate rapidly, even this recycled ingot method is not satisfactory and further cost reduction measures are required. (Problems to be Solved by the Present Invention) Therefore, the present invention seeks to find an aluminum deoxidizing agent that is more economical and has stronger deoxidizing power than the method using recycled lumps, and a method for producing the same. [Structure of the Invention] The deoxidizing agent of the present invention will be described below based on the drawings of Examples. In FIG. 1 showing a side cross section thereof,
1 is approximately the diameter obtained by crushing waste aluminum alloy.
A coarse piece with an irregular cross section of 10 mm or less, for example, AA standard #3000, #5000, #6000, etc. can be used. 2 is 10-20% of waste aluminum alloy 1
High-purity aluminum mixed in a proportion of 99.7% or more of pure aluminum is desirable, and aluminum foil can be used, for example. 3 is at least one metal selected from magnesium, manganese, chromium, titanium, silicon, zirconium, and boron, which is administered to increase the deoxidizing ability, and the powder is mixed at a ratio of about 0.1 to 1%. Alternatively, it may be added in the form of an alloy containing the same amount. Then, the present deoxidizing agent is obtained by molding these mixtures into a block in a bonded state that maintains gaps (pores) through which the solution can enter. Next, the method for manufacturing the aluminum deoxidizing agent of the present invention will be explained with reference to FIG. 2, which shows the process. (Composition) Collect punching slag generated in the manufacturing process of aluminum products such as drinking water cans, or waste aluminum alloy such as once-used building material aluminum alloy, and add 99.7% or more at a ratio of 10-20% to this aluminum alloy. In addition to adding high-purity aluminum, magnesium, manganese, chromium, titanium, and
At least one of silicon, zirconium, and boron is administered in the form of a powder, or in the form of an alloy containing the same amount of the metal. (Crushing) After iron removal, the mixture blended in the above ratio is cut and shredded to be crushed into small pieces with irregular cross-sections with a diameter of about 10 mm or less as shown in Figure 1, that is, the pieces have uneven surfaces. It should also be easy to fit in the shape. (Heating) After separating and removing large-diameter foreign objects from the crushed pieces, they are placed in a heating furnace, heated to 300℃-400℃, and slowly allowed to rise in temperature.
It softens the aluminum material to make it easier to mold in the next step, and also makes the surface semi-molten to improve bonding properties. At the same time, impurities such as oil adhering to the metal are also burned away. (Pressure molding) After stirring the same strip with a stirrer to make the material uniform, a pressure of about 3-10 tons/cm ² is applied with a pressurizer. Then, since high-purity aluminum has been softened in the previous process and has excellent malleability, when pressure is applied to it, the soft high-purity aluminum interposes between the uneven alloy pieces and becomes entangled. At the same time, the surface becomes semi-molten and bonding force is generated in the aluminum itself, so that the strips are strongly formed into a block shape. Furthermore, since the blocks are connected by intertwining the strips in an uneven manner, a gap is formed inside the block through which the solution can enter. Thus, for waste aluminum alloy strips 10
The structure is made by mixing high-purity aluminum flakes of 99.7% or more in the range of -20% and dosing metals such as magnesium, manganese, chromium, etc. at about 0.1-1% to increase the deoxidizing ability, and molding the block into a porous shape. The aluminum deoxidizer of the present invention is produced. [Operations and Effects of the Invention] According to the deoxidizing agent of the present invention having the above configuration, high purity aluminum strips are mixed with waste aluminum alloy strips in a range of 10-20%, and the two are intertwined and bonded in an uneven shape. Because it is a solid material, gaps (pores) are formed inside the block through which the solution can enter, and the reaction also proceeds inside the block, so the surface area of the strips is maximized and the deoxidizing efficiency is dramatically improved. In addition, the dissolution rate is fast and reverse deoxidation can be prevented. Furthermore, since some metals are added to increase the deoxidizing power, the addition of metals such as magnesium, zircon, and titanium can work together with the aluminum alloy and high-purity aluminum to significantly increase the deoxidizing power. In addition, according to the conventional recycled lump method based on melting, due to the nature of aluminum which is easily oxidized at high temperatures, 20% to 30% of oxides are generated during the recycling process and are discarded as losses, but the manufacturing method of the present invention According to 3.3, a heating process involves coarsely crushing waste aluminum alloy into small pieces, then heating the mixture with high-purity aluminum pieces and rare earth metals to 300°C to 400°C to make the surface semi-molten. - Because the processing is skillfully combined with a molding process that applies pressure of about 10 tons/cm ² ,
There is no need to worry about the formation of oxides, and eliminating this loss greatly contributes to cost reduction.
Furthermore, there is no need to melt the entire recycled aluminum at great expense, and a strongly bonded aluminum deoxidizer can be obtained with only a small operating cost, so that the purpose of cost reduction can also be achieved from this point of view. <Example> Formulation

【table】

[Table] The mixture based on the above table is crushed into pieces of approximately 5 x 3 x 1 mm by using a cutting machine and a shredding machine, and the pieces are passed through a vibrating sieve to remove large-diameter foreign matter. to be stored. Next, after quantitatively sending this through the screwer, it is transported to a heating furnace and heated to 300℃-400℃ with a burner.
The pieces are made to soften and become semi-molten by moving them slowly at a speed of 500 mm/min on a conveyor in a furnace maintained at a constant temperature. Next, the pieces were put into a stirrer and stirred to make the mixture homogeneous, and then a press machine was used to make the mixture 4 tons/cm ²
Apply pressure to form into a block of approximately 2φ x 0.5cm.
A deoxidizing agent of the present invention was obtained. As described above, the present invention can provide an aluminum deoxidizing agent that is more economical and has a stronger deoxidizing power than the conventional technology that relied on recycled lumps, and a method for producing the same, which can greatly improve the steelmaking process. It brings significant benefits.

[Brief explanation of the drawing]

The drawings show examples of the present invention. Figure 1 is a longitudinal cross-sectional side view of the aluminum deoxidizer of the present invention, and Figure 2 is a schematic side view showing the manufacturing method of the aluminum deoxidizer of the present invention in order of each step. . 1... Waste aluminum alloy, 2... High purity aluminum, 3... Metal.

Claims (1)

[Claims] 1. High purity aluminum chips of 99.7% or more are mixed with waste aluminum alloy chips in the range of 10-20%, and magnesium, manganese, chromium, titanium, silicon, At least one metal among zirconium and boron
An aluminum deoxidizer for steelmaking, characterized in that it is administered in a range of 0.1-1% and molded into a porous block. 2. Mix 10-20% of high-purity aluminum flakes of 99.7% or more with coarsely broken waste aluminum alloy into small pieces, and add magnesium, manganese, chromium, titanium, silicon, etc. to further increase the deoxidizing ability. At least one metal selected from zirconium and boron is administered in a range of 0.1-1%, and then heated to 300°C-400°C to soften the aluminum and bring the surface into a semi-molten state to impart bonding properties. A method for producing an aluminum deoxidizing agent for steelmaking, characterized in that the aluminum deoxidizer is further subjected to a pressure of 3 to 10 tons/cm ² to form a porous block.