Prefabricated furnace wall of aluminum electrolysis cell

Abstract

The utility model discloses a prefabricated furnace wall of an aluminum electrolysis cell, which comprises furnace wall single blocks, a plurality of furnace wall single blocks are spliced and built on a circle, close to the bottom, of a hearth of the electrolysis cell to form a weir wall structure, the weir wall structure is attached to an artificial extension leg of the electrolysis cell, the width of each prefabricated furnace wall is 200-600mm, and the thickness of each prefabricated furnace wall is 5-15cm; and gaps between the prefabricated furnace walls are filled with a powder mixture. According to the utility model, uncontrollable factors such as components, quality, shape, time and the like in the furnace wall forming process in the prior art are solved, the starting management period of the electrolytic bath is shortened, the hearth management of the electrolytic bath is perfected, and the problems that precipitates are easily formed at the edge and the formation of a high-quality hearth is hindered in the prior art are solved.

Description

Technical Field

[0001] The present invention belongs to the technical field of aluminum electrolysis production, and particularly relates to a prefabricated ledge for an aluminum electrolytic cell. Background Art

[0002] The aluminum electrolysis process is not only a simple electrolysis production process, but also a dynamic equilibrium process including crust formation and melting. If the aluminum electrolytic cell is damaged, it will affect production. Generally speaking, the damage of the electrolytic cell is related to many factors, mainly depending on the quality of the cathode material, the cell structure design and the production operation.

[0003] The main factors affecting the normal life of the aluminum electrolytic cell and their proportions in the cell life are roughly as follows: the cell type structure design accounts for 20%, the furnace building technology accounts for 20%, the quality of the cell lining raw materials accounts for 10%, the baking and startup method accounts for 25%, and the production operation management accounts for 25%. Of course, any serious mistake in the above factors can cause early damage to the cell lining. It can be seen that the early damage is mostly the result of the combined influence of various factors. Among them, whether a regular hearth with a high molecular ratio can be established and maintained inside the electrolytic cell can not only improve the current efficiency of the electrolytic cell, but also protect the cell lining to extend the life of the electrolytic cell. The quality of the ledge formation is the top priority of electrolysis management and will directly affect the production during the cell life.

[0004] The ledge of the existing pre-baked aluminum electrolytic cell is mainly an unstable structural layer automatically formed in the early stage of electrolysis. Generally, the management during the abnormal period after the electrolytic cell is baked and started requires at least 3 months to form a regular ledge better. The time cycle is long, and during the formation process of the ledge, uncontrollable factors such as its components, quality, shape, and time are likely to cause precipitation at the edge, resulting in poor stability. Utility Model Content

[0005] In order to solve the above technical problems, the present utility model provides a prefabricated ledge for an aluminum electrolytic cell.

[0006] The technical solution adopted by the present utility model is that a prefabricated ledge for an aluminum electrolytic cell includes single ledge blocks. Multiple single ledge blocks are used and are spliced and built at the bottom of the electrolytic cell hearth to form a weir wall structure, and the weir wall structure is attached to the artificial extension of the electrolytic cell.

[0007] Preferably, the width of each prefabricated ledge is 200 - 600 mm, and the thickness is 5 - 15 cm.

[0008] Preferably, the above single ledge blocks include corner section single blocks and splicing section single blocks. The corner section single blocks are in an L shape adapted to the corners of the electrolytic cell hearth, and the splicing section single blocks are in a long strip shape. T-shaped grooves and T-shaped platforms are respectively arranged at both ends of the corner section single blocks and the splicing section single blocks, and adjacent two single ledge blocks are spliced and fixed through the T-shaped grooves and T-shaped platforms.

[0009] Preferably, a week of card slots are provided at the inner bottom of the electrolytic cell, and a boss is provided at the bottom end of each single piece of the prefabricated furnace lining corresponding to the card slot. The single piece of the furnace lining is connected to the electrolytic cell by embedding the boss into the card slot.

[0010] Preferably, the gaps between the single pieces of the furnace lining are filled with a filler.

[0011] Compared with the prior art, the beneficial effects of the present utility model are as follows: by using single pieces of prefabricated furnace lining to build the furnace lining before roasting and starting up, a good polymer furnace lining and furnace chamber shape are constructed, forming a furnace chamber with uniform components or uniform component changes as a whole, solving the uncontrollable factors such as components, quality, shape, time, etc. in the process of forming the furnace lining in the prior art, shortening the start-up management cycle of the electrolytic cell, improving the furnace chamber management of the electrolytic cell, and solving the problems in the prior art that are likely to cause precipitation at the edge and hinder the formation of a high-quality cell chamber. Among them, the single pieces of the furnace lining are connected in a concave-convex inlay between the single pieces of the furnace lining and between the single pieces of the furnace lining and the electrolytic cell, which is not only convenient for installation but also reliable in connection. Description of the Drawings

[0012] Figure 1 is a schematic structural diagram of the present utility model;

[0013] Figure 2 is a top view of the present utility model;

[0014] Figure 3 is a partial schematic diagram of the connection between the prefabricated furnace lining and the electrolytic cell;

[0015] Figure 4 is Figure 2 a partial enlarged view of A of Detailed Embodiments

[0016] The following will further explain and illustrate the present utility model in conjunction with the drawings of the specification, so as to be better understood by those skilled in the art.

[0017] Embodiment 1

[0018] As Figures 1-4 shown, a prefabricated furnace lining for an aluminum electrolytic cell includes single pieces of furnace lining 1. Multiple single pieces of furnace lining 1 are used and are spliced and built at the bottom of the furnace chamber of the electrolytic cell 2 to form a weir wall structure 3, and the weir wall structure 3 is attached to the artificial extension leg of the electrolytic cell 2. The width of each single piece of furnace lining 1 is 200 - 600 mm, and the thickness is 5 - 15 cm.

[0019] The above-mentioned single block of the furnace lining 1 includes a corner single block 101 and a splicing single block 102. The corner single block 101 is in an L shape adapted to the corner of the hearth of the electrolytic cell 2, and the splicing single block 102 is in a strip shape. T-shaped grooves 103 and T-shaped platforms 104 are respectively arranged at both ends of the corner single block 101 and the splicing single block 102. Adjacent two single blocks of the furnace lining 101 are spliced and fixed through the T-shaped grooves 103 and the T-shaped platforms 104. The single blocks of the furnace lining are inlaid through matching concave-convex structures, which can not only quickly connect and assemble, but also have good connection stability.

[0020] In order to improve the connection stability between the single block of the furnace lining 1 and the electrolytic cell 2, a week of clamping grooves 201 are arranged at the inner bottom of the above-mentioned electrolytic cell 2. A convex platform 105 is provided at the bottom end of the single block 1 of the prefabricated furnace lining corresponding to the clamping groove 201. The single block 1 of the furnace lining is connected to the electrolytic cell 2 by embedding the convex platform 105 into the clamping groove 201.

[0021] Usage method: First, make the single block of the furnace lining according to the design. The single block of the furnace lining is prepared from cryolite and soda ash and made into a shaped prefabricated single block of the furnace lining, and its molecular ratio is 2.7 - 3.1; before the electrolytic cell is baked and started for charging, use the single blocks of the furnace lining to splice and build a weir wall structure 3 in a circle near the bottom of the hearth of the electrolytic cell 2, so that the electrolytic cell 2 can quickly form a good furnace lining and protect the artificial extension leg during baking and starting. Among them, the gaps between the single blocks of the furnace lining are filled with a filler, and the filler is a powder mixture, and the powder mixture includes cryolite and soda ash, and the mass ratio of the two is 3:1.

[0022] The present invention adopts a polymer prefabricated trough lining; in addition, the molecular ratio of the electrolytic cell is increased, and finally the NaF / AlF 3 The molecular ratio (molar ratio, CR) reaches 2.9 - 3.1.

[0023] A good furnace lining can promote better separation of carbon slag and electrolyte. On the premise of a high molecular ratio, the trough lining established in this way will be more solid, the trough chamber will be more regular, and it can withstand the temperature fluctuations during normal production in the future, achieving the purpose of improving the electrolysis current efficiency and reducing the early damage of the electrolytic cell.

[0024] The above-mentioned embodiments are only descriptions of the preferred embodiments of the present utility model, and do not limit the scope of the present utility model. Without departing from the design spirit and principle of the present utility model, various deformations and improvements made by those skilled in the art to the technical solution of the present utility model shall fall within the protection scope determined by the claims of the present utility model.

Claims

1. A prefabricated furnace wall for an aluminum electrolytic cell, characterized in that: The invention comprises a furnace side block (1), wherein the furnace side block (1) is made of a plurality of blocks, which are spliced ​​and built around a furnace of an electrolytic cell (2) near the bottom to form a weir wall structure (3), wherein the weir wall structure (3) fits the artificial legs of the electrolytic cell (2); the furnace side block (1) comprises a corner section block (101) and a splicing section block (102), wherein the corner section block (101) is in an L-shape adapted to the corner of the furnace of the electrolytic cell, and the splicing section block (102) is in an elongated strip shape, and both ends of the corner section block (101) and the splicing section block (102) are respectively provided with a T-shaped groove (103) and a T-shaped platform (104), and two adjacent furnace side blocks (1) are spliced ​​and fixed via the T-shaped groove (103) and the T-shaped platform (104).

2. The prefabricated sidewall of an aluminum electrolytic cell according to claim 1, characterized in that: The width of each furnace sidewall block (1) is 200-600 mm and the thickness is 5-15 cm.

3. The prefabricated sidewall of an aluminum electrolytic cell according to claim 1, characterized in that: The bottom of the electrolytic cell (2) is provided with a peripheral slot (201), and a boss (105) is provided at the bottom end of a prefabricated furnace sidewall block (1) corresponding to the slot (201), and the furnace sidewall block (1) is embedded in the slot (201) and connected to the electrolytic cell (2) via the boss (105).

4. The prefabricated furnace side of an aluminum electrolytic cell according to claim 1, characterized in that: The gaps between the furnace side monoliths (1) are filled with a filler.

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