JPS60190532A - Rotary cooling body for apparatus for producing high- purity aluminum - Google Patents

Abstract

PURPOSE:To prevent disengagement of a main body from a cap during rotation of a rotary cooling body by constituting the rotary cooling body of the main body and the cap, making the coefft. of thermal expansion of the main body smaller than the coefft. of thermal expansion of the cap and fitting the cap by screwing to the top end of the peripheral surface of the main body. CONSTITUTION:A rotary cooling body 5 for aluminum is constituted of a graphite main body 6 made into a bottomed cylindrical shape and a cap 7 made of a stainless steel to close the aperture at the top end of the body 7. The body 6 is made into a tapered cylindrical shape and is formed with an internal screw at the top end on the inside peripheral surface thereof. The coefft. of thermal expansion of said body is made smaller than the coefft. of thermal expansion of the cap 7. A fitting part 7a is provided to the cap 7 and an external screw is formed on the outside peripheral surface thereof. The internal screw of the body 6 and the external screw of the cap 7 are fitted by screwing to form the body 5 and cooling fluid is supplied through the blow- off ports 11 of a cooling fluid blow-off member 10 provided in said body, by which cooling of aluminum is performed. The disengagement of the cap 7 from the body during the cooling operation is thus obviated.

Description

[Detailed Description of the Invention] This invention is based on Karasu Ir! This invention relates to a rotary cooling body for aluminum production equipment.

The applicant proposed an aluminum refining method using segregation solidification in order to produce high-purity aluminum.
0 In this refining method, after melting the aluminum to be purified, this molten aluminum is always heated and maintained at a temperature exceeding its solidification temperature, and a cooling body is immersed in this heated molten aluminum. By maintaining the surface temperature of the cooling body below the solidification temperature and rotating this cooling body to disperse and mix the impurities emitted near the solidification interface, the concentration of impurities near the solidification interface in the liquid phase can be reduced. It is characterized by crystallizing high-purity aluminum on the surface of the cooling body while making the thickness thinner and thereby steepening the temperature gradient in the liquid phase in the impurity-concentrated layer. Br1
No. 57-82437).

The present invention is used in a device used to carry out the method described above, and an object of the present invention is to provide a rotary cooling body that is not likely to be damaged during operation and is easy to maintain. .

Cycle φλ for high-purity aluminum production equipment according to the present invention
The cold iJI body consists of a right-bottom cylindrical body made of non-metallic heat-resistant material and a regulator that closes the upper end opening of the body. A female thread is formed at the upper end, and the container has an arrow part that is fitted into the upper end opening of the main body, and the fitting part is screwed into the main body.

In the above, graphite, ceramics, etc. are used as the nonmetallic heat-resistant abrasive.

The main body is made of a non-metal heat-resistant material because it has excellent heat resistance and does not react with aluminum, so there is no risk of contaminating the aluminum. The lid is made from stainless steel, for example. The lid is made of steel because it has great strength.

In this rotary cooling body, a hollow rotating shaft is fixed to the center of the lid so as to communicate with the cooling body. A cooling fluid supply pipe is arranged within the hollow rotating shaft. When producing high-purity aluminum, this rotary cooling body is immersed in molten aluminum and rotated while supplying cooling fluid to the inside from the cooling fluid supply tube.

The rotary cooling body according to the present invention is constructed as described above, and the thermal expansion coefficient of the lid is larger than that of the main body, so that when the cooling body is immersed in molten aluminum, the thermal expansion of the lid is The amount is larger than the thermal expansion capacitance h1 of the main body. Therefore, the gap between the female screw at the upper end of the inner circumferential surface of the body and the male screw on the outer circumference of the indigo inset part becomes smaller, allowing them to come into close contact with each other. There is no risk of it coming off and getting damaged. In addition, when the rotary cooling body is removed from the molten aluminum when installing the nail rest, the rotary cooling body is cooled by 741 degrees, but in this case, the amount of contraction of the lid is equal to the contraction of the body This makes it easier to remove the lid from the main body, making maintenance easier.

Furthermore, since the I + l) i entry part of the strip is screwed into the main body and the lid is removed from the main body, high-purity aluminum can be deposited on the peripheral wall surface of the main body, resulting in increased recovery efficiency. increases.

This invention will be described below with reference to embodiments shown in the drawings.

FIG. 1 shows an entire apparatus for continuously producing high-purity aluminum. Continuous production equipment melts aluminum M'
On the right side of the 1J melting furnace (1), there are five molten metal holding crucibles (
2A) to (2[) are arranged side by side, and each crucible (2A)
- (2F) are connected by a gutter (3) arranged between the upper ends. The aluminum melted in the melting furnace (1) is then fed into the leftmost crucible (2Δ). The molten metal fed into the crucible (2C) passes through the gutter (3) to the crucibles (2B) to (2E) on the right side.
The JJI flows into the interior one after another, and is discharged to the outside from the crucible (2[) on the right side. A stirrer (4) is placed inside the leftmost crucible (2A). In the other four crucibles (2B) to (2E), there is a rotary cooling body (with which the top can be moved freely) for crystallizing high-purity aluminum.
5) are arranged one by one.

The rotary cooling 1Jli book (5), as shown in Figure 2, has a cylindrical graphite body (6) at the bottom right, and a stainless steel rose (7) that closes the soil edge part [1] of the body (6). ). Main body (6)
The bottom wall (6a) is approximately three times as thick as the peripheral wall (611). At the upper end of the circumferential surface -
Ilt threads are formed. The bottom wall (6a) of the main body (6)
) is made thicker than the thickness of the circumference qv ((3b), l) for the following reason.In other words, if there is a3 on the lower surface of the cooling body (5), the cooling body (5) Due to the flaws, the purity of the aluminum crystallized on the lower surface of the cooling body (5) became lower than the purity of the aluminum crystallized on the peripheral surface, and after the work was completed, aluminum was removed from the surface of the cooling body (5). This is because during recovery, it mixes with aluminum crystallized on the surrounding surface, reducing the overall refining efficiency.Therefore, in order to prevent aluminum from crystallizing on the bottom surface of the cooling body (5), The thickness of the bottom wall (6a) of the main body (6) of the cooling body (5) is made thicker than the thickness of the peripheral wall (6b), so that the bottom surface is influenced by the cooling fluid supplied into the cooling body (5). Keep the lid (7) as it is (4).
6) has a disc shape with a diameter equal to the outer diameter of the upper end, and has a cylindrical fitting part (7a) on its lower surface that is fitted into the upper end opening of the main body (6). ) has a male thread formed on its outer circumferential surface.

The cylindrical fitting part (7a) is screwed into the upper end opening of the main body (6).In addition, the lower end of the hollow rotary @ (8) is connected in communication with the center of the swallow (7). A cooling fluid supply pipe (9) is arranged inside the hollow rotating shaft (8).

A female thread is formed on the inner peripheral surface of the lower end of the cooling fluid supply pipe (9). At the bottom end of the cooling fluid supply pipe (9),
An I-fluid Suitabe shrine (10) is fixed in a communicating manner. The blow-off member (10) has a cylindrical shape with both upper and lower ends closed, and a large number of cooling fluid blow-off ports (11) are formed in the peripheral wall.

The air outlet (11) is formed in a plurality of rows arranged vertically at predetermined intervals in the circumferential direction.

At the center of the top wall of the blowout member (10) is a communication pipe (1) that communicates the inside of the Suita member (10) with the cold nozzle 41 fluid supply (9).
2> is fixed. An ljf thread is formed on the outer peripheral surface of the upper end of the communication H (12), and the cooling fluid supply pipe (9)
It is screwed inside.

In the continuous manufacturing apparatus for high-purity aluminum having such a configuration, the aluminum to be refined is melted in the melting furnace (1) and sent to each crucible (2Δ) to (2F). This molten aluminum contains Fe, Si, Cu
, M(+, etc.) contains impurities that form peritectic with aluminum such as I'i, V, 7r (hereinafter referred to as peritectic impurities), the leftmost crucible (2A
), borium was added to the molten metal,
), the phosphorus reacts with peritectic impurities such as 1, 7-r, 1-*B2, V132, and Z.
' Insoluble metal borides such as 82 are formed.

When the molten metal G in each crucible (2Δ) to (2E) reaches a predetermined amount, the cooling body (5) is immersed in the molten metal while avoiding descending, and the cooling fluid supply pipe (9 ) is rotated while blowing out cooling fluid from the outlet (11) of the blow-off member (10) attached to the lower end of the blow-out member (10). When the eutectic impurity (13) and the leftmost crucible (2△) are added, high purity aluminum (A) is crystallized on the circumferential surface of the rotary cooling body (5), and the excess boron is in the liquid phase. is discharged into the cooling body (5)
It is moved away from the cooling body (5) by the centrifugal force generated by the rotation of the cooling body (5). In addition, the metal borides contained in the molten aluminum are also cooled by the centrifugal force generated by the rotation of the φλ cooling film (5). , II body (5), the aluminum crystallized on the circumferential surface of the rotary cooling body (5) will no longer contain metal borides.

In this way, aluminum 19 of higher purity than the original aluminum to be refined supplied from the melting furnace (1) is obtained.

In the second embodiment, the rotary cooling body of the present invention is used in a continuous manufacturing apparatus for high-purity aluminum equipped with a plurality of crucibles, but the invention is not limited to this, and the rotary cooling body of the present invention is used in a manufacturing apparatus equipped with a single crucible. It can also be used for

[Brief explanation of the drawing]

The drawings show an embodiment of the present invention, and FIG. 1 is a vertical cross-sectional view of a continuous manufacturing apparatus for high-purity aluminum using a rotary cooling body, and FIG. 2 is a vertical cross-sectional view of the rotary cooling body. (5)...Rotating cooling body, (6)...Main body, (7)...
... Lid, (7a) ... Insertion part. that's all

Claims (1)

[Claims] A1 Bottom cylindrical main body (6) made of non-metallic heat-resistant material;
) consists of a #A lid (7) that closes the top opening of the main body (
The coefficient of thermal expansion of M (7) is smaller than that of the container (7), and a thread is formed at the upper end of the inner peripheral surface of the main body (6).
The fitting part (7) is fitted into the upper end opening of the main body (6).
a), a male thread is formed on the outer peripheral surface of the fitting part (7a), and the fitting part (7a) is screwed into the upper end of the main body (6). Cooling body.