Side lining of aluminum electrolyzer

FIELD: non-ferrous metallurgy; electrolytic production of aluminum; cathode units of aluminum electrolyzers.

SUBSTANCE: proposed side lining includes interconnected members - plates and blocks made from non-metallic refractory compounds possessing high resistance and interconnected by means of end faces in form of inversed symmetrical projections and recesses and adhesive or cementing mix. Plates and blocks are made from silicon carbide. Angular blocks are made in form of strip, 70 mm thick and 600-800 mm long which is bent at center around longitudinal axis at angle of 90° relative to vertical whose end faces are inclined at angle of 18° relative to vertical and are narrowing downward by 219 mm each. End faces are made in form of inversed symmetrical projections and recesses at radius of 14-15 mm which are parallel to vertical axis of walls of aluminum electrolyzer.

EFFECT: increased service life; enhanced strength and reliability; saving of lining material; increased useful volume of electrolyzer; increased yield of aluminum.

4 dwg

 

The invention relates to ferrous metallurgy, in particular to the electrolytic production of aluminum, namely to design cathodic device aluminum cell, and can be used in electrolytic cells of all types.

Known side-lining of the cell, consisting of coal plates and insulating refractories Handbook of metallurgy of nonferrous metals. The production of aluminum. M.: metallurgy, 1971, p 203-206.

The disadvantages of this side-lining of the cell are: low durability, reliability, low service life.

The feedback components cryolithological melt faces melt lateral faces of coal plates formed by the cervix, which is constantly increasing, leads to the destruction of the coal stoves. Such destruction of the coal stoves also leads to the destruction side of the lining, to the penetration of the melt to the metal casing and the breakthrough of the melt from the bath of the cell.

Known side-lining of an aluminum reduction cell in the description of the invention to the patent of Russian Federation №2186880 IPC 7 25 3/08 from 05.03.2001, ed. Gromov BS, Pak W., Akhmedov S., EPUB.

1. Side lining of an aluminum reduction cell, consisting of two parts made of materials with different resistance contained in the shaft of the pot to melt, the cat is where the upper part is made of plates of non-metallic refractory compounds, with increased resistance, and the lower part of the interconnected blocks of carbonaceous material having low resistance, characterized in that the plates of the non-metallic refractory compounds is installed in a groove made in the upper faces of the blocks of the carbon-containing material, and United with blocks of carbon-containing material gluing or cementing composition or termination of the specified groove carbon-based material.

2. The lining according to claim 1, characterized in that the plates of the non-metallic refractory compounds are installed in two rows with the bandaging of seams.

3. The lining according to claim 2, characterized in that the plates of the non-metallic refractory compounds of the first and second series connected gluing or cementing composition.

4. The lining according to claim 1 or 2, characterized in that the plates of the non-metallic refractory compounds are interconnected by gluing or cementing composition.

Disadvantages: low durability, reliability, low service life.

The horizontal seams between the two parts of the lining around the perimeter of the side surface of the aluminum cell dramatically reduces the reliability of the entire lining of an aluminum reduction cell, since such expansion joints are always the most vulnerable to penetration components Cree is litopenaeus melt, the absence of the entire cast blocks in the corners of the aluminum cell increases the probability of penetration of the melt to the casing aluminum cell in the corner joints of the lining, which consists of two parts, since the angles always feel elevated mechanical load during the operation of the aluminum electrolysis cell.

The closest technical solution is the side lining of an aluminum reduction cell in the ed. the certificate number 377419, MKI 22 D 3/02, publ. Bulletin no.18, 1973, ed. Romanov V.P., Tsyplakov A.M.

1. Side lining of an aluminum reduction cell made from carbon-containing materials, characterized in that to reduce the cost of lining and create a more rational form of mine electrolytic cell, it is executed at the height of materials with different resistance to the melt contained in the mine of the cell, while the upper part is made from a material with high resistance, and the lower part is made of material with low resistance.

2. The lining according to claim 1, characterized in that to complete the upper part of the carbonaceous material used graphite plate.

3. The lining according to claim 1, wherein to perform the bottom of the carbonaceous material used coal fired units.

4. The lining according to claim 1, characterized in that the lower the actu made printed from carbonaceous mass.

Disadvantages: low durability, reliability, low service life. The presence of component parts (upper and lower) side of the lining aluminum cell increases the probability of penetration components cryolithological melt through horizontal expansion joints of the casing is aluminum cell. The absence of the entire cast corner blocks in the corners of the aluminum cell leads to breakthrough aggressive molten medium in the corner joints of the side lining of an aluminum reduction cell. All this reduces the reliability and service life of the entire lining of an aluminum reduction cell.

The technical result of the invention: improved service life, durability, reliability, economy of lining material, increase the efficiency of the aluminum electrolysis cell, the output of finished aluminum.

The technical result is achieved due to the fact that the side lining of an aluminum reduction cell, consisting of interconnected elements - slabs and blocks made of non-metallic refractory compounds having high resistance, with end faces in the form obratnosimmetricheskoy protrusions and recesses and the adhesive or grout material, characterized in that the plates and blocks are made of non-metallic refractory compounds having high resistance to redcine, and as the blocks are angular blocks, made in the form of strips of a thickness of 70 mm, a length of 600-800 mm, bent in the middle around the longitudinal axis at an angle of 90°, faces which are inclined at an angle of 18° to the verticals and narrowed down to 219 mm each, and the end faces are made in the form obratnosimmetricheskoy protrusions and recesses with a radius of 14-15 mm, which is parallel to the vertical axis of the walls of the aluminum cell.

Achieving high reliability and durability, increasing the service life is ensured by the fact that the side lining of an aluminum reduction cell is made entirely of silicon carbide plates special design, the corners of the aluminum cell zapateroone whole cast corner blocks that allows you to completely eliminate expansion joints in the corners of the aluminum cell, as the least reliable elements of the entire lining of an aluminum reduction cell, and a flat surface of the side walls of the aluminum cell futurewise carbide plates, which are joined together end faces representing obratnosimmetricheskoy protrusions and depressions. Similar obratnosimmetricheskoy ledges and hollows and all four corner blocks, which together with the plates during Assembly of the lining in a closed loop across the side surface of the backsheet is avago cell are glued with a special solution to increase the hydrostatic penetration resistance in the connecting seams components cryolithological melt, resulting in increased service life of the lining.

The invention allows to increase the resistance of this lining contained in the aluminum pot to melt at least 1.5 times, to eliminate the coupling plates in the corners of the aluminum cell, as the most loaded and least reliable elements of the side lining of an aluminum reduction cell, especially during start aluminum electrolytic cell and in the initial period of its operation. The distinguishing feature of the claimed invention is that the plates and the corner blocks have on the end faces obratnosimmetricheskoy protrusions and recesses, the surfaces of which are lubricated with special cementitious mortar. These activities lead to increased service life of the aluminum electrolytic cell, eliminating the leakage of the electrolyte.

Achieving the above technical result is ensured by the fact that in the construction of the side lining of an aluminum reduction cell for the production of aluminum used plates and the whole corner blocks, in order to exclude the coupling plates in the corners of the aluminum electrolysis cell, which are the least reliable elements of the side lining. Application obratnosimmetricheskoy protrusions and recesses on the mounting faces of all elements of the side lining of an aluminum reduction cell also what contributes to the achievement of the above technical result is to increase the resistance of the lateral lining and the next significant difference between the proposed lateral lining from the prototypes. The use of side-lining of an aluminum reduction cell smaller thickness allows no additional cost to save a number of refractory carbide material, to increase the useful volume of the aluminum electrolysis cell by 13% and, as a consequence, to increase the yield of aluminum by 13% from each melt, which is an additional advantage and difference of the lateral lining from analogues. Thus, the proposed lateral lining aluminum cell meets the criteria of the invention of "novelty."

The comparison of the proposed solutions not only prototypes, but also with other technical solutions in this field of technology shows that the use of carbide materials to protect the side walls of the aluminum electrolytic cell for aluminium production is known, but in this case through the use of plates, corner blocks and obratnosimmetricheskoy protrusions and recesses on the mounting faces of all elements of the side lining of an aluminum reduction cell, which during Assembly of the side lining of an aluminum reduction cell are glued with a special solution on the surface of obratnosimmetricheskoy protrusions and recesses, improves the stability and increase the service life of the side lining of an aluminum reduction cell is not less than 1.5 times. The above mainly who define the company is not in the analogues. Therefore, the claimed invention meets the condition of "technical level".

These advantages allow you to create a mechanically stable zapatenovannuyu surface, to organize a strong ISM layer that protects the surface of the lining from the corrosive molten environment, allowing to reduce the MHD effect in an aluminum electrolysis cell.

Thus, the present invention has features which allow to make a conclusion about its compliance with the criterion of "significant differences".

Figure 1 shows a fragment of the side lining of the cell (top view);

Figure 2 shows a section a-a (side view side lining).

Figure 3 shows the block corner in a perspective view.

Figure 4 shows the plate in a perspective view.

The essence of the invention.

The side lining of aluminum electrolysis cell consists of two basic elements: a plate with dimensions 720×360×703, a corner block 5, which are placed on inclined walls of the aluminum electrolytic cell 1, and corner blocks 5 made in the form of strips of a thickness of 70 mm, a length of 600-800 mm, bent in the middle around the longitudinal axis at an angle of 90°, faces which are inclined at an angle of 18° to the verticals and narrowed down to 219 mm each, and obratnosimmetricheskoy projections 6 and recesses 7 to join the Executive the faces of all elements are made parallel to the vertical axis of the walls of the aluminum electrolysis cell, this obratnosimmetricheskoy projections 6 and recesses 7 made in the form of concave and convex semi-cylinders with a radius of 15 mm and 14 mm, which is parallel to the vertical axis of the walls of the aluminum cell.

Industrial applicability.

Installation of the side lining of an aluminum reduction cell is performed after installation of the bottom sections and execution of masonry edge, representing the masonry fireclay bricks along the walls of the housing 1 aluminum cell. The mounting elements of the side lining of the cell begins with the installation of corner blocks 5 on the edge of the corners of the aluminum cell. Then after greasing surfaces obratnosimmetricheskoy projections 6 and recesses 7 on the mounting faces of all elements of special cementitious mortar above the plates is taken sequentially, one after the other, all four walls of the aluminum cell from one corner of block 5 to the other, pushing and coaxing this obratnosimmetricheskoy projections 6 and recesses 7 on the mounting faces of all elements, starting with the first plate 3 to the corner block 5, and then all subsequent plates to the previous one. This extrusion of cementitious mass along the entire length obratnosimmetricheskoy projections 6 and recesses 7 of the plate 3 and the corner of the block 5 is a symptom of filling gaps between the bonding is by poverhnosti. A gap of 20 mm between elements carbide liner and the housing 1 aluminum electrolytic cell is maintained with wooden wedges. Then after installation of the lining and stiffening of the grout material consistently wedges are removed and the gap is hammered insulating mass 2, which must have at least two properties: mechanical strength and low thermal conductivity. With this installation, the corner blocks 5 and plate 3 of carneceria reliable fixation with angular blocks and each other. Frozen special solution prevents penetration into the connecting seams components cryolithological melt. The final stage of installation of the aluminum cell is filling compacted bottom mass 4 gap between the lateral lining and the furnace hearth aluminum cell. Bottom weight should perform the function of a barrier against the penetration of the electrolyte to the furnace hearth aluminum cell.

Side lining of an aluminum reduction cell, consisting of interconnected elements - slabs and blocks made of non-metallic refractory compounds having high resistance, with end faces in the form obratnosimmetricheskoy protrusions and recesses and the adhesive or grout material, characterized in that the plates and blocks are made of non-metallic refractory compounds, with increased resistance, silicon carbide, and as the blocks used corner blocks, made in the form of strips of a thickness of 70 mm, a length of 600-800 mm, bent in the middle around the longitudinal axis at an angle of 90°, faces which are inclined at an angle of 18° to the verticals and narrowed down to 219 mm each, and the end faces are made in the form obratnosimmetricheskoy protrusions and recesses with a radius of 14-15 mm, which is parallel to the vertical axis of the walls of the aluminum cell.



 

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