Aluminum cell

FIELD: major repair of aluminum cells.

SUBSTANCE: cathode casing of aluminum cell includes lengthwise walls with windows for outlet of cathode rods, end walls, bottom and ring frames rigidly joined with walls and bottom. In order to lower labor consumption, simplify mounting and dismounting operations. Ring frames adjacent at least to one of lengthwise walls (except boundary ring frames) from their upper part till inner edge in range of height of windows for outlet of cathode rods are freely adjoined to said lengthwise wall. According to other variant of invention at least one lengthwise wall is detachable. Parting places of said wall are arranged between boundary ring frames in range of height of windows for outlet of cathode rods. In parting places members providing rigid joint of detachable wall with fixed portion of casing wall are mounted.

EFFECT: improved design, simplified works at major repair.

4 dwg

 

The invention relates to ferrous metallurgy, in particular to the design of aluminum electrolysis cell, and can be used for overhaul.

Famous all-welded casing cathode aluminum reduction cell comprising a longitudinal wall with Windows to output cathode rods, end walls, bottom, frames, covering the walls and the bottom and set in increments along the length of the casing (Patent of Russian Federation №2051204, class 25 With 3/08, publ. 27.12.95. Bull. No. 36).

With this design the casing of the cathode aluminum reduction cell hampered the performance of installation works relating to installation of bottom sections, resulting in higher labor costs and increase the time of a major overhaul. When installing the bottom section protruding from two sides of the cathode rods bend section and make the lower ends of the cathode bars in the window so to give the possibility to omit the inside of the casing opposite end, then section zentrums in the casing. This installation of bottom sections may damage the top layer of the cap lining and, in addition, peripheral printed welds wide, which greatly degrades the quality of the installation and reduces service life of the cathode of the device. All-welded converters casing difficulties causes removal the waste linings and especially the operation for removing the cathode rods, projecting from the Windows of the longitudinal walls, which also leads to increased labor costs and increase the time of carrying out capital works.

The closest is the casing of the cathode aluminum reduction cell including lined the inside of the duct with longitudinal walls with Windows to output cathode rods, end walls, bottom and ribs. While the frames, wall boxes and belt stiffness of the end walls are made detachable, thereby separating along the perimeter of the shroud placement of Windows on the top and bottom. The rigid connection of the upper part of the casing from the bottom is performed by connecting the frames of the link elements.

Between the frames, the placement of Windows for displaying the cathode rods can be located additional stiffeners connected to the longitudinal walls (Patent of Russian Federation №2082831, class 25 With 3/08, publ. 27.06.97).

The disadvantage of this cathode casing is small lifetime. When installing a removable upper part to the lower part, with a large overall length of the cathode casing, reaching on modern high-cells 15000 mm, it is difficult to provide a tight junction of the upper and lower parts around the perimeter. The presence of leaks in the connector leads to the tightness of the lining. The air easily penetrate to the side of the new lining, oxidizes and destroys it. In addition, emerging in the process of operation casing thermal stress and tension from the expansion of the lining as a result of its impregnation with salts also lead to deformation and the formation of gaps at the weakest points, namely in the areas of the connector frames, walls and zones of stiffness that can cause breakthrough of the melt through the connector.

With this design the casing of the cathode aluminum reduction cell is complicated installation work, as necessary around the perimeter of the casing, through the numerous number of fasteners to connect the upper and lower parts, which leads to higher labor costs and increase the time of a major overhaul.

The disadvantage of this casing cathode is that the belt rigidity, located around the perimeter of the casing, at the level of the output of the cathode rods, together with the fastening elements, is characterized by high intensity.

An object of the invention is to improve and simplify the conditions of dismantling the casing and reducing labor costs.

This object is achieved in that in an aluminum electrolytic cell containing a cathode casing including a longitudinal wall with Windows to output cathode rods, end walls, bottom and ribs, W is stco United with the walls and bottom, at least one of the longitudinal walls, the frames adjacent to it, except for the extreme, from the top inside edge and within the height of the Windows for displaying the cathode rods freely adjacent to the longitudinal wall, or at least one longitudinal wall is made detachable from the location of the connector between the end frames and within the height of the Windows for displaying the cathode rods, and in places the connector wall elements are installed, providing a rigid connection removable wall with a fixed part of the wall of the casing.

Cathode casing such aluminum cell selected cut in the longitudinal wall between the end frames and within the height of the Windows for displaying the cathode rods, allows you to save the remaining part of the body casing after the dismantling of the cut out part of a wall of a unified and all-welded, eliminating the need to run the connector in the end walls and along the entire length of the longitudinal walls, which greatly increases the rigidity of the casing and respectively its service life. In addition, the design feature is that if you reuse the cathode casing can be produced by welding is not only the removable connection part of the wall with the rest of the wall of the casing, but also of the frames to the longitudinal wall for their entire duration that the biggest step is neither moves the cover to all-welded construction.

This design is characterized by a lower intensity of the cathode casing, as it doesn't contain zones of rigidity and fasteners.

With this design the installation of a new liner when the overhaul is carried out off-cut side of the wall, which allows operation on establishment of the cathode rods in the window of the longitudinal walls at a horizontal position of the bottom section, with the least effort and in the shortest time, while reducing the possibility of damage to the top layer of the cap lining, which positively affects the quality of construction works and, accordingly, the service life. In addition, moving the horizontal position of the bottom sections on the pillow lining, allows to reduce the width of the peripheral joints, which greatly reduces the effort for ones bottom by the weight of these joints and increases the service life of the lining.

The cathode casing made with the connector in the longitudinal wall and providing for the dismantling of the removable wall without the use of welding, allows to produce not only installation work when installing a new shell and the lining with the lowest labor costs, but also to implement them directly in the current case, in terms of magnetic fields, without the use of special welding equipment.

Figure 1 image is Agen cathode casing aluminum cell, side view;

figure 2 is the same cross section;

figure 3 - the same, with connector on one wall, side view;

figure 4 - the same, with connector on one wall cross section.

Aluminum electrolytic cell contains a cathode casing, which includes a longitudinal wall of 1.2 with Windows 3 to output cathode rods, the end wall 4, a bottom 5, the frames 6-11 set in increments along the length of the casing. In places of prospective or existing connector in the longitudinal wall 1 frames 7-10 freely adjoin the longitudinal wall 1. As elements, providing a rigid connection of the removable wall and box cover, can be used flanges 12, thus connecting them with each other can be carried out, for example, by a bolt or wedge connection. The side surface of the connector removable walls and boxes can have both vertical and inclined position.

When the overhaul is cut out or removed the removable part of the longitudinal wall 1, then, by known methods is the dismantling of the waste liner. After preparation of the cathode casing for reuse of mounting the cap of the bath with the preparation of the top layer for laying of bottom sections. Bottom sections are fed into the cathode casing in a horizontal position. When performing a removable walls on both prod the selected walls 1 and 2 of the bottom section serves down and immediately set in the design position, and in the presence of the connector in only one of the longitudinal walls 1, it is necessary to perform centering of the bottom section, which is a horizontal move it sideways, for the establishment of the cathode rods in window 3 all-welded wall 2. After installing all bottom sections on the pillow lining is made rigid fastening removable walls to the housing body of the cathode. Then mounted the side lining. Completes the lining casing prints bottoms, prints interconnect and peripheral welds deck weight.

Implementation of the present invention allows to improve and simplify the conditions for the complete dismantling of the casing and to reduce labor costs.

Aluminum electrolytic cell containing a cathode casing including a longitudinal wall with Windows to output cathode rods, end walls, bottom and ribs rigidly United with the walls and a bottom, characterized in that at least one of the longitudinal walls of the frames adjacent to it, except for the extreme, from the top to the inside edge and within the height of the Windows for displaying the cathode rods freely adjoin the longitudinal wall or at least one longitudinal wall is made detachable from the location of the connector between the end frames and within the height of the Windows for displaying the cathode rods, and m the pH of the connector wall elements are installed, providing a rigid connection removable wall with a fixed part of the wall of the casing.



 

Same patents:

FIELD: nonferrous metallurgy; production of aluminum by electrolysis of fused salts.

SUBSTANCE: the invention I pertinent to nonferrous metallurgy and may be used in a design of electrolyzers for production of aluminum by electrolysis of fused salts. The technical result of the invention is hardening of a hearth, a decrease of thickness of a metal layer on the hearth and an interpolar space, a decrease of speeds of circulatory flows of cathodic metal, a decrease of losses of current. The cathodic device contains a lined cathodic housing and a hearth made out of from carbonaceous blocks with channels of a rectangular cross section. On the surface of the hearth there is a wetted with aluminum cover and the channels have the length equal to the width of the stack of the cathodic device, and with a width equal 1,1-2,2 well of the carbonaceous block, depth, equal to 0.2-0.4 of height of the carbonaceous block and thy are formed by the lateral longitudinal surfaces of the carbonaceous blocks and the carbonaceous blocks of the lateral cathodic lining. The electro-conductive cover wetted with aluminum is made out of titanium diboride.

EFFECT: hardening of a hearth, a decrease of thickness of a metal layer on the hearth and an interpolar space, a decrease of speeds of circulatory flows of cathodic metal, a decrease of losses of current.

2 cl, 2 dwg

FIELD: metallurgy; production of graphitic cathodes.

SUBSTANCE: the invention presents an impregnated graphitic cathode for production of aluminum by electrolysis and is pertinent to the field of metallurgy, in particular, to production of the graphitic cathodes used in production of aluminum by electrolysis. The invention offers an impregnated graphitic cathode for electrolysis of aluminum and a method of its production. The cathode contains in its pores an impregnating product heat-treated. At that in the capacity of the impregnating product the cathode contains a carboniferous product heat treated under the temperature of no less than 1600°С to provide resistance to erosion at the expense of protection by the formed graphitized binding substance. The method includes production of the graphitic cathode, its impregnation by dipping into the impregnating product in vacuum and a thermal treatment. At that the graphitic cathode is produced from coke, with graphite or without it, and also from a pitch, and before impregnation it is exposed to calcination at the temperature exceeding 2400 °С. The impregnation is realized by a carboniferous product at the temperature of its viscous state and the thermal treatment of the impregnated cathode is conducted at the temperature of less than 1600 °С, but sufficient for hardening and-or sintering of the impregnating product and formation of the non-graphitized coal layer for protection of graphitizing binding substance against erosion. The technical result is an increase of service life of the graphitic cathode.

EFFECT: the invention ensures an increase of service life of the graphitic cathode.

4 cl, 2 dwg, 1 ex

FIELD: metallurgy; graphitic cathodes for production of aluminum.

SUBSTANCE: the invention presents a graphitic cathode for electrolysis of aluminum and is dealt with the field of metallurgy, in particular, with the graphitic cathodes used in production of aluminum by an electrolysis. The graphitic cathode for electrolysis of the aluminum is produced by graphitization of the cathodic block from a carbonaceous material. At that the cathode is made as the entire block with different specific electrical resistance along its longitudinal axis. At that the specific electrical resistance in the end areas of the cathode is more, than in its central area. The technical result - increased service life of the graphitic cathode at the expense of increased erosion resistance in the end areas of the cathode.

EFFECT: the invention ensures increased service life of the graphitic cathode at the expense of increased erosion resistance in the end areas of the cathode.

6 cl, 7 dwg, 1 tbl

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The invention relates to ferrous metallurgy, in particular to the electrolytic production of aluminum, namely to design cathodic aluminum cell device

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The invention relates to the metallurgy of non-ferrous metals, in particular, to the design of the cathode casing aluminum cell

The invention relates to ferrous metallurgy, in particular to the electrolytic production of aluminum

FIELD: metallurgy; graphitic cathodes for production of aluminum.

SUBSTANCE: the invention presents a graphitic cathode for electrolysis of aluminum and is dealt with the field of metallurgy, in particular, with the graphitic cathodes used in production of aluminum by an electrolysis. The graphitic cathode for electrolysis of the aluminum is produced by graphitization of the cathodic block from a carbonaceous material. At that the cathode is made as the entire block with different specific electrical resistance along its longitudinal axis. At that the specific electrical resistance in the end areas of the cathode is more, than in its central area. The technical result - increased service life of the graphitic cathode at the expense of increased erosion resistance in the end areas of the cathode.

EFFECT: the invention ensures increased service life of the graphitic cathode at the expense of increased erosion resistance in the end areas of the cathode.

6 cl, 7 dwg, 1 tbl

FIELD: metallurgy; production of graphitic cathodes.

SUBSTANCE: the invention presents an impregnated graphitic cathode for production of aluminum by electrolysis and is pertinent to the field of metallurgy, in particular, to production of the graphitic cathodes used in production of aluminum by electrolysis. The invention offers an impregnated graphitic cathode for electrolysis of aluminum and a method of its production. The cathode contains in its pores an impregnating product heat-treated. At that in the capacity of the impregnating product the cathode contains a carboniferous product heat treated under the temperature of no less than 1600°С to provide resistance to erosion at the expense of protection by the formed graphitized binding substance. The method includes production of the graphitic cathode, its impregnation by dipping into the impregnating product in vacuum and a thermal treatment. At that the graphitic cathode is produced from coke, with graphite or without it, and also from a pitch, and before impregnation it is exposed to calcination at the temperature exceeding 2400 °С. The impregnation is realized by a carboniferous product at the temperature of its viscous state and the thermal treatment of the impregnated cathode is conducted at the temperature of less than 1600 °С, but sufficient for hardening and-or sintering of the impregnating product and formation of the non-graphitized coal layer for protection of graphitizing binding substance against erosion. The technical result is an increase of service life of the graphitic cathode.

EFFECT: the invention ensures an increase of service life of the graphitic cathode.

4 cl, 2 dwg, 1 ex

FIELD: nonferrous metallurgy; production of aluminum by electrolysis of fused salts.

SUBSTANCE: the invention I pertinent to nonferrous metallurgy and may be used in a design of electrolyzers for production of aluminum by electrolysis of fused salts. The technical result of the invention is hardening of a hearth, a decrease of thickness of a metal layer on the hearth and an interpolar space, a decrease of speeds of circulatory flows of cathodic metal, a decrease of losses of current. The cathodic device contains a lined cathodic housing and a hearth made out of from carbonaceous blocks with channels of a rectangular cross section. On the surface of the hearth there is a wetted with aluminum cover and the channels have the length equal to the width of the stack of the cathodic device, and with a width equal 1,1-2,2 well of the carbonaceous block, depth, equal to 0.2-0.4 of height of the carbonaceous block and thy are formed by the lateral longitudinal surfaces of the carbonaceous blocks and the carbonaceous blocks of the lateral cathodic lining. The electro-conductive cover wetted with aluminum is made out of titanium diboride.

EFFECT: hardening of a hearth, a decrease of thickness of a metal layer on the hearth and an interpolar space, a decrease of speeds of circulatory flows of cathodic metal, a decrease of losses of current.

2 cl, 2 dwg

Aluminum cell // 2256009

FIELD: major repair of aluminum cells.

SUBSTANCE: cathode casing of aluminum cell includes lengthwise walls with windows for outlet of cathode rods, end walls, bottom and ring frames rigidly joined with walls and bottom. In order to lower labor consumption, simplify mounting and dismounting operations. Ring frames adjacent at least to one of lengthwise walls (except boundary ring frames) from their upper part till inner edge in range of height of windows for outlet of cathode rods are freely adjoined to said lengthwise wall. According to other variant of invention at least one lengthwise wall is detachable. Parting places of said wall are arranged between boundary ring frames in range of height of windows for outlet of cathode rods. In parting places members providing rigid joint of detachable wall with fixed portion of casing wall are mounted.

EFFECT: improved design, simplified works at major repair.

4 dwg

FIELD: formation of protective coatings for carbon containing components of electrolytic cell at aluminum production.

SUBSTANCE: method comprises steps of preparing liquid suspension of refractory material dispersed in solution of lignosulfonate binder; applying suspension as coating on surface of carbon containing component; drying coating.

EFFECT: improved resistance of carbon containing component against rupture at operation of electrolysis cell.

34 cl, 1 dwg, 4 tbl, 7 ex

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

FIELD: aluminum cells, namely cathode facing for them.

SUBSTANCE: cathode facing includes carbon blocks, heat insulation layer and refractory part having two protection layers, upper layer adjoining to carbon blocks and lower layer made of powder materials. Upper protection layer includes alumosilicate composition resistant against action of electrolyte components containing 27 -35% of Al2 O3 with fraction size no more than 2.5 mm and with thickness consisting 10 - 50% of height of refractory part. Lower protection layer is made at least of one sealed metallic vessel filled with refractory material including carbon-containing composition resistant against action of melt aluminum and electrolyte components and having heat conductivity factor no more than 0.1 Wt/(mK). In lower protection layer vessels are filled with carbon black; thickness of said layer consists 50 - 90% of height of refractory part.

EFFECT: increased useful life period, improved operational characteristics of cell.

3 cl, 7 dwg, 1 tbl

FIELD: aluminum production electrolyzers of all types.

SUBSTANCE: proposed method includes mounting the heat-insulating and refractory components of electrolyzer and applying protective material on base of covalent nitrides to surface of side lining. Used as protective material is boron nitride-based material which ensures reduction of after-start period, increases electrolyzer service life, enhances aluminum grade, increases yield by current and daily productivity of electrolyzer; protective material is applied flush with top in continuous layer. Lower boundary of coat is located below "electrolyte-metal" interface. Thickness of coat is maintained within 0.1-1 mm. Open surface porosity is maintained within 2-3%. Consistency of material of coat changes from fluid to viscous-flow state. Application of coat is performed by spraying, painting or concrete-spraying method.

EFFECT: increased service life of electrolyzer; increased daily productivity of electrolyzer.

4 cl, 2 dwg, 1 tbl

FIELD: installation of aluminum electrolyzer hearth.

SUBSTANCE: proposed method includes preliminary estimation of quality of hearth modules by proximate ultrasonic inspection, mounting of complete set of hearth modules and forming of hearth; electrolyzer is equipped with hearth modules at inhomogeneity index not exceeding 0.65 relative units according to ultrasonic inspection; inhomogeneity index is determined by the following formula Iinhom = (tmax/tmin-1), where Iinhom is inhomogeneity index according to ultrasonic inspection; tmax is maximum magnitude of index of ultrasonic inspection for definite electrolyzer; tmin is minimum magnitude of index of ultrasonic inspection for definite electrolyzer; hearth is formed in such way that adjacent modules with close indices of ultrasonic inspection are mounted in longitudinal and transversal directions; modules with minimum indices of ultrasonic inspection are mounted in center of hearth at smooth increase of this index toward end faces of electrolysis bath.

EFFECT: increased service life of hearth; reduced yield of low-grade metal; reduced power requirements.

3 dwg, 1 ex

FIELD: mounting aluminum electrolyzers at major repair or in capital construction.

SUBSTANCE: current-supply metal rod is placed in slot of carbon block on layer of carbon-containing conducting material. Surface of carbon block slot is preliminarily coated with carbon-based surfactant and layer of carbon-containing conducting material is compacted by vibration applied on current-supply metal rod, thus ensuring reliable electromechanical "conducting rod-carbon block" contact and reducing probability of penetration of aluminum melt into hearth body. At application of vibration in local zone on side of flush area, maximum reduction of voltage drop is ensured in contact layer between rod and block slot. Maximum thickness of layer of carbon-containing conducting material before vibration is equal to optimal magnitude determined by definite formula.

EFFECT: enhanced efficiency.

4 cl, 4 dwg, 1 tbl

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