DE102008025090A1 - Device for producing aluminum, comprises cathodic vessel, anode means, electrical source for generating direct current between the cathodic vessel and the anode means for extracting molten aluminum from bath, and assembly with chisel - Google Patents

Abstract

The device comprises a cathodic vessel, an anode means, an electrical source for generating direct current between the cathodic vessel and the anode means for extracting molten aluminum from a bath, and an assembly with a chisel (1) for breaking a crust, which forms itself in the area of the anode means during the production. The chisel comprises a measuring rod (6), which is placed inside an interior tube of the chisel, with a temperature sensor for detecting the temperature of the bath. The measuring rod comprises a non-metallic upper part (7) with a larger diameter. The device comprises a cathodic vessel, an anode means, an electrical source for generating direct current between the cathodic vessel and the anode means for extracting molten aluminum from a bath, and an assembly with a chisel (1) for breaking a crust, which forms itself in the area of the anode means during the production. The chisel comprises a measuring rod (6), which is placed inside an interior tube of the chisel, with a temperature sensor for detecting the temperature of the bath. The measuring rod comprises a non-metallic upper part (7) with a larger diameter and a small axial extension for fastening the measuring rod on the chisel, and a remaining part with a smaller diameter. The chisel consists of three hollow cylinders (2, 3, 4), of which a first hollow cylinder serves as a jacket and as a bottom area of the chisel in combination with the second hollow cylinder during the second and first cylinders connect with the third hollow cylinder, which forms the interior tube for carrying the measuring rod. An air gap (5) exists between the first and third cylinders. The remaining part of the measuring rod protrudes with a tip over the bottom area of the chisel, where the tip protrudes to 0-50 mm. The interior tube of the chisel consists of steel. The size of the air gap is 1-50 mm with an external diameter of the chisel of 50-150 mm. The temperature sensor is implemented by placing a thermocouple on the lower end of the measuring rod while a cable for connecting the thermocouple passes inside the measuring rod.

Description

Field of the invention

The The invention relates to a device for producing aluminum, comprising a cathodic vessel, anode means, an electrical source for generating a direct current between the cathodic vessel and the anode means for Extraction of molten aluminum from a bath, and an assembly with a chisel for breaking a crust, which is itself during manufacture in the field of anode agents forms, the chisel a dipstick, which within a Inner tube of the chisel is placed, with a temperature sensor for detecting the temperature of the bath.

Background of the invention

Of the very important raw material aluminum is nowadays by means of process won as a Hall / Heroult basin. During this Process is aluminum from a bath by generating an electric River between a cathodic vessel, which the bath contains, and won an anode. This will a layer of molten aluminum on the bottom of the cathodic Formed vessel and removed by suction, during the forming during the electrolysis Oxygen reacts with the carbon of the anode to form carbon dioxide. In addition, a crust forms in the region of the anode, which covers the bath. This crust must be broken be to the cathodic vessel during the aluminum production to supply more alumina. For this reason, usually an assembly with provided with a chisel. As the constancy of the temperature the bath has a significant impact on the efficiency of the Hall / Heroult basin has, in addition, usually one Device for measuring the temperature can be arranged to the Feeding to the basin to regulate.

State of the art

The US 6,065,867 A discloses an apparatus in which a rod for measuring the temperature is movably disposed within a chisel provided for rupturing the crust occurring during operation of the Hall / Heroult basin. Due to the possible relative movement between the bit and the measuring rod, a break-up movement of the bit and a measuring movement of the rod can be carried out independently of each other. Furthermore, the rod is enclosed by a housing to provide guidance in an inner tube of the bit.

Of the Disadvantage of such a device is that the need consists of at least two moving pistons, one for moving of the chisel and one for moving the dipstick. Furthermore There is a risk that solidified bath on the surface of the dipstick a clinging between chisel and dipstick could produce, so that no relative movement between the two more possible. Another disadvantage is that due to the surrounding housing a measurement of the temperature a correspondingly long time will take.

Object of the invention

It Therefore, the object of the present invention is a device to provide for measuring the temperature of the bath, which offers a simple structure and fast measuring times. Of Furthermore, it is an object of the present invention to provide the effects of solidified bath on the functionality of the device to reduce.

These The object is based on the preamble of claim 1 in conjunction solved with its characterizing features. Advantageous developments The invention are defined in the dependent claims played.

The Invention includes the technical teaching that a dipstick a upper part with a larger diameter and a small axial extension for attaching the measuring rod on Chisel and a remaining part with a smaller diameter having. This will create an air gap between the chisel and the remaining part of the dipstick. Because of the solid Connection between chisel and dipstick is another Piston not necessary, taking a measurement of the bath temperature while breaking the crust with the chisel is performed. Because the dipstick is located inside the chisel is, he is also better protected from the environment, so that a housing surrounding the dipstick is not needed becomes. Therefore, the measuring times for detecting the bath temperature be reduced. In addition, due to the arrangement of the dipstick solidified bath on the surface of the assembly no influence on the functionality.

According to a preferred embodiment of the invention, the chisel consists of three hollow cylinders, the first of which serves as a shell and in combination with the second as the bottom part of the chisel, while the second further connects the first cylinder to the third, which supports the inner tube for supporting the chimney Measuring rod forms, wherein there is an air gap between the first and the third hollow cylinder. As a result, an air insulation between the inner tube and the shell of the bit is formed, what the temperature influences over reduces the coat and improves the measurement.

advantageously, the remaining part of the measuring rod overlaps with a tip the ground area of the chisel. This results in a further improvement of the measurement, as the dipstick earlier comes into contact with the bath.

According to one Another preferred embodiment is the measuring tip over the bottom area of the bit at about 0 to 50 mm before. With a supernatant of this size Optimal measurement is possible while at the same time the mechanical load on the dipstick during breakage the crust can be kept low.

It is an advantage of the present invention that the upper part of the measuring rod is not metallic. As a result, there is no metallic Contact between the dipstick and the chisel and the measurement error will be reduced accordingly.

Corresponding another embodiment of the present invention the inner tube of the chisel is made of steel. This has the Advantage that the inner tube is capable of thermal stress to withstand in the bath and the dipstick reliably too wear.

advantageously, the size of the air gap lies between chisels and dipstick at an outside diameter of the bit from 50 to 150 mm in the range of 1 to 50 mm. In this relationship between the sizes of the chisel and the air gap a sufficient air insulation is achieved.

According to one Another embodiment of the invention is the temperature sensor by placing a thermocouple at the lower end of the dipstick, while a cable for connecting the thermocouple inside of the measuring rod runs. By using such a structure Can a temperature measurement accurately and easily be executed.

Further, The measures improving the invention will be described below together with the description of a preferred embodiment of the invention with reference to the figure shown in more detail.

Detailed description the drawing

The single figure shows schematically the chisel 1 for measuring the temperature in a bath of a - not shown here - Hall / Heroult basin. The chisel 1 has a first hollow cylinder 2 on which the mantle of the chisel 1 defined and which at a lower axial end with a second hollow cylinder 3 connected to the bottom of the chisel 1 to build. This second cylinder 3 is further on its radial inside with a third hollow cylinder 4 connected and has such a radial extent that an air gap 5 between the first hollow cylinder 2 and the third hollow cylinder 4 is formed. The third hollow cylinder 4 in turn defines the inner tube in which the dipstick 6 is arranged. In particular, the dipstick 6 with the third hollow cylinder 4 by means of an upper part 7 connected, which one to the inner diameter of the hollow cylinder 4 having corresponding outer diameter. The rest part 8th of the dipstick 6 has a smaller diameter than the upper part 7 and extends toward the bottom portion of the bit 1 , being above the latter with a tip 9 survives. However, it will be clear to one skilled in the art that it is also possible to use the tip 9 at the same height as the bottom of the chisel 1 to place or something about it. Due to the smaller diameter of the remaining part 8th of the dipstick 6 is between the chisel 1 and the dipstick 6 an air gap 10 generated. Furthermore, in the top 9 a thermocouple 11 placed, which with a - not shown here - electronic unit of the Hall / Heroult basin by means of a cable 12 which is inside the dipstick 6 runs.

Consequently, with such a construction, it is possible to control the temperature of the bath of a Hall / Heroult basin while fracturing the forming crust with the chisel 1 to eat.

1

chisel

2

first hollow cylinder

3

second hollow cylinder

4

third hollow cylinder

5

air gap

6

dipstick

7

upper Part rod

8th

remaining Part rod

9

top

10

air gap

11

thermocouple

12

electric wire

QUOTES INCLUDE IN THE DESCRIPTION

This list The documents listed by the applicant have been automated generated and is solely for better information recorded by the reader. The list is not part of the German Patent or utility model application. The DPMA takes over no liability for any errors or omissions.

Cited patent literature

• - US 6065867 A [0003]

Claims (8)

Apparatus for producing aluminum comprising a cathodic vessel, anode means, an electrical source for generating a direct current between the cathodic vessel and the anode means for recovering molten aluminum from a bath, and a chisel assembly ( 1 ) for breaking up a crust which forms during manufacture in the region of the anode means, wherein the chisel ( 1 ) a dipstick ( 6 ), which within an inner tube of the bit ( 1 ), comprising a temperature sensor for detecting the temperature of the bath, characterized in that the measuring rod ( 6 ) an upper part ( 7 ) with a larger diameter and a small axial extension for attaching the measuring rod ( 6 ) on the chisel ( 1 ) and a remaining part ( 8th ) with a smaller diameter, wherein between the remaining part ( 8th ) of the dipstick ( 6 ) and the chisel ( 1 ) an air gap ( 10 ) consists. Device according to claim 1, characterized in that the chisel ( 1 ) of three hollow cylinders ( 2 . 3 . 4 ), of which the first ( 2 ) as a jacket and in combination with the second ( 3 ) as the bottom portion of the bit ( 1 ), while the second ( 3 ) the first cylinder ( 2 ) with the third ( 4 ) connecting the inner tube for carrying the measuring rod ( 6 ), wherein between the first ( 2 ) and the third hollow cylinder ( 4 ) an air gap ( 5 ) consists. Device according to claim 1 or 2, characterized in that the remaining part ( 8th ) of the dipstick ( 6 ) over the bottom portion of the bit ( 1 ) with a tip ( 9 ) protrudes. Device according to claim 3, characterized in that the tip ( 9 ) over the bottom portion of the bit ( 1 ) projects by about 0 to 50 mm. Device according to one of the preceding claims, characterized in that the upper part ( 7 ) of the dipstick ( 6 ) is not metallic. Device according to one of the preceding claims, characterized in that the inner tube of the chisel ( 1 ) consists of steel. Device according to one of the preceding claims, characterized in that at an outer diameter of the bit ( 1 ) from 50 to 150 mm the size of the air gap ( 10 ) is in the range of 1 to 50 mm. Device according to one of the preceding claims, characterized in that the temperature sensor is obtained by placing a thermocouple ( 11 ) at the lower end of the dipstick ( 6 ) while a cable ( 12 ) for connecting the thermocouple ( 11 ) within the dipstick ( 6 ) runs.