CN106319566A - Pre-baked anode aluminum electrolytic cell anode configuration method - Google Patents

Abstract

The invention relates to an anode configuration method, in particular to an intermediate point type blanking prebaked anode anode configuration method for an aluminum electrolytic cell. A prebaked anode aluminum electrolytic cell anode configuration method, comprising an electrolytic cell, an anode carbon block, a feeding point, a middle slot and a gap, characterized in that the slots along the long axis direction of the electrolytic cell are arranged alternately with narrow slots and diamond-shaped slots; Below and before and after the feeding point is a diamond-shaped central seam. The length of the diamond-shaped central seam is the total width of two anode carbon blocks plus the two gaps. The diamond-shaped central seam is surrounded by four anode carbon blocks and adjacent gaps. Advantages and effects of the present invention: Compared with the prior art, the present invention fully takes into account the requirements of the blanking opening space and the total amount of electrolyte during the alumina blanking, dissolution and diffusion process, and focuses on expanding the anode area participating in the electrochemical reaction. Reduce the unnecessary area of the middle seam, achieve the purpose of improving the current efficiency and increasing the production capacity of the cell, and bring various benefits to the technical upgrading and new design of the electrolytic cell.

Description

Prebaked anode aluminum electrolytic cell anode configuration method

technical field

The invention relates to an anode configuration method, in particular to an intermediate point type blanking prebaked anode anode configuration method for an aluminum electrolytic cell.

Background technique

The adoption of intermediate point feeding technology eliminates the adverse effects of alumina side feeding operation, reduces cathode precipitation in the tank chamber, increases the anode reaction area, and improves the current efficiency. As modern aluminum electrolytic cells continue to move towards large-scale and energy-saving directions, it is necessary to effectively use the furnace area and increase the anode reaction area as much as possible.

At present, the anodes of the aluminum electrolytic cell are suspended and fixed on the anode busbars on the left and right sides of the upper structure, and are arranged in two symmetrical rows along the long axis of the electrolytic cell. A 150-200mm wide middle gap is usually set between the two rows of anodes for Accommodates shelling hammer action and point-type intermittent feeding. Generally, 4~8 groups of shelling hammers and constant volume feeders are installed above the middle seam. A 30~50mm wide gap is usually set between individual anodes in each row of anodes. , mainly used to discharge anode gas.

Chinese patent ZL201110063297.2 proposes that the horizontal section at the discharge port is a rectangle with a side length of 100-300mm or two diamonds with a diagonal length of 200-400mm, and the middle seam outside the discharge port is 30mm in the anode configuration of the aluminum electrolytic cell. ~50mm narrow center seam. On the one hand, this anode configuration ignores the fact that alumina melts and absorbs heat after being added to the electrolytic cell, and the space at the discharge port is cramped. After the electrolyte melt releases heat, the temperature drops rapidly and will become suspended, which is not conducive to the subsequent alumina melting. On the other hand, the 30~50mm narrow gap hinders the electrolyte flow, and the incompletely melted alumina will only float on the electrolyte, and cannot diffuse to the area far from the cutting point, which will easily lead to the occurrence of the anode effect.

Contents of the invention

The invention provides an anode configuration method for a prebaked anode aluminum electrolytic cell, the purpose of which is to increase the area of the anode participating in the electrochemical reaction and reduce the area of the middle seam not participating in the electrochemical reaction. At the same time, the present invention considers the mass transfer process in which the powdered alumina particles will dissolve while floating in the molten electrolyte after blanking, so as to provide sufficient space and heat for the transfer and dissolution of alumina.

In order to achieve the above object, the present invention provides a prebaked anode aluminum electrolytic cell anode configuration method, including electrolytic cell, anode carbon block, feeding point, middle slit and intermediate slit, and is characterized in that the middle slit along the direction of the long axis of the electrolytic cell is successively narrow middle slit , The diamond-shaped seams are arranged alternately; the bottom and front and back of the feeding point are diamond-shaped seams, the length of the diamond-shaped seam is the total width of two anode carbon blocks plus the two seams, and the diamond-shaped seam is composed of four anode carbon blocks and adjacent seams surrounded.

The short sides of the four anode carbon blocks facing the wide middle slit are all cut off, so that the anode carbon block has a trapezoidal cross-section; the width of the diamond-shaped middle slit surrounded by the four trapezoidal anode carbon blocks is between 100-300mm, and the narrowest point is not less than 100mm, the widest part is not more than 300mm, the width of the narrow middle gap is between 60~100mm, and the gap between the anode carbon blocks is 30~50mm.

The area of the diamond-shaped slit is adjusted according to the current intensity and the anode current density. For every 1% increase in the current intensity or the anode current density, the area of the rhombus-shaped slit increases by 1% to 2%.

The length ratio of a rhombus-shaped slit to a narrow slit is 1:1.

The working current of the electrolyzer is 160~700kA.

Advantages and effects of the present invention: Compared with the prior art, the present invention fully takes into account the requirements of the blanking opening space and the total amount of electrolyte during the alumina blanking, dissolution and diffusion process, and focuses on expanding the anode area participating in the electrochemical reaction. Reduce the unnecessary area of the middle seam, achieve the purpose of improving the current efficiency and increasing the production capacity of the cell, and bring various benefits to the technical upgrading and new design of the electrolytic cell.

Description of drawings

Fig. 1 is a schematic diagram of an anode configuration of an electrolytic cell according to the present invention.

FIG. 2 is a partially enlarged view of FIG. 1 .

In the figure: 1. Electrolyzer; 2. Anode carbon block; 3. Feeding point; 4. Slit; 5. Diamond-shaped slit; 6. Narrow slit.

detailed description

The embodiments of the present invention will be described in detail below in conjunction with the accompanying drawings, but the protection scope of the present invention is not limited by the embodiments.

Example 1

As shown in Figure 1, a prebaked anode aluminum electrolytic cell anode configuration method, including electrolytic cell 1, 48 anode carbon blocks 2, feeding point 3, the middle seam along the long axis direction of the electrolytic cell is sequentially narrow middle seam 6, diamond-shaped middle seam 5 are alternately arranged; the bottom and front and back of the feeding point 3 are diamond-shaped middle seams 5, and the length of the diamond-shaped middle seams 5 is the total width of two anode carbon blocks plus two gaps 4. The diamond-shaped middle seams are composed of four anode carbon blocks 2 and adjacent The seam 4 is surrounded by.

The ends of the short sides of the four anode carbon blocks 2 facing the wide middle slit are all cut off, so that the section of the anode carbon block 2 is trapezoidal; the width of the diamond-shaped middle slit surrounded by the four trapezoidal anode carbon blocks 2 is between 100-300mm, the narrowest The width of the narrow center gap is not less than 100mm, the widest point is not more than 300mm, the width of the narrow middle gap is between 60~100mm, and the gap between the anode carbon blocks is 30~50mm.

The area of the rhombic central slit 5 is adjusted according to the current intensity and the anode current density. For every 1% increase in the current intensity or the anode current density, the area of the rhomboid central slit increases by 1% to 2%.

The length ratio of a diamond-shaped central slit 5 to a narrow central slit 6 is 1:1.

The working current of electrolyzer 1 is 160~700kA.

Claims (5)

1. a prebaked cell for aluminum-reduction anode arrangement method, including electrolysis bath, anode carbon block, feed point, middle seam and break joint, it is characterised in that the middle seam along electrolysis bath long axis direction be followed successively by narrow middle seam, rhombus stitch alternately arranged；The lower section of feed point and be front and back to stitch in rhombus, stitches a length of two pieces of anode carbon blocks and adds the overall width of two break joints, stitch and surrounded by four pieces of anode carbon blocks and adjacent break joint in rhombus in rhombus.

A kind of prebaked cell for aluminum-reduction anode arrangement method the most according to claim 1, it is characterised in that minor face one end that four pieces of anode carbon blocks stitch towards alleviating distention in middle-JIAO is all shaved one section, and it is trapezoidal for making anode carbon block cross section；Stitching width in the rhombus that four pieces of trapezoidal anode carbon blocks surround between 100-300mm, the narrowest place is not less than 100mm, and the widest part is not more than 300mm, the width of narrow middle seam between 60 ~ 100mm, between anode carbon block between be sewn on 30 ~ 50mm.

A kind of prebaked cell for aluminum-reduction anode arrangement method the most according to claim 1, it is characterized in that in rhombus, the area of seam is adjusted according to current intensity and anodic current density, current intensity or anodic current density often increase by 1%, and in rhombus, the area of seam increases by 1% ~ 2%.

A kind of prebaked cell for aluminum-reduction anode arrangement method the most according to claim 1, it is characterised in that in a rhombus, seam is 1:1 with the length ratio of a narrow middle seam.

A kind of prebaked cell for aluminum-reduction anode arrangement method the most according to claim 1, it is characterised in that electric tank working electric current is at 160 ~ 700kA.