JPS58136792A - Method and device for scraping and removing electrolytic bath residue form prebaked anode - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to
The present invention relates to a method and an apparatus for scraping and removing electrolytic bath residue adhering to a used pre-fired (prQcute) anode taken out from an electrolytic bath for producing aluminum by the method described in .

In these electrolyzers, each anode element includes a shaped and prefired carbonaceous block. The block has several closed holes, and suspension and electrical connection means are provided by pouring specific cast iron or sometimes by filling these holes using carbonaceous paste. It's included. The means usually consist of round steel rods - often two to six anode nogs - one
It is connected by a leg welded to a suspension rod which is locked to. All such systems use ALUM
French Patent No. 1519475 (U.S. Patent No. 3351546 in the name of INIUM PECHINEY)
No. 2,350,407 (U.S. Pat. No. 4,119,505)
No.) etc.

When the anode is worn out, the entire anode element is replaced, but it contains the following four elements that can be recovered and recycled: A rod-leg that can be reused by being embedded in a new pre-fired anode. Assembly, one after proper processing anode paste (p'1ite d'
The carbon residue used as a component of the anode, i.e., [Meso(m5got) J.

- the electrolytic bath which accumulates on the anode as a scale and is reintroduced into the cypress after undergoing appropriate treatment; - as well as the fixing casting iron used for fixing the new anode.

The present invention relates to the separation of electrolytic bath scale from the remainder of the anode system.

ATKO 4 [PLD, SCRENO 9, SCALE HAMMER (
marteaux piqueura), vibrating or non-vibrating propulsion pole, chisel (burineura pou)
sseura), carried out by more or less mechanized means such as harrows, and sometimes completed by the action of a vibrating table to evacuate the bath drawn away from the anode element; Operators must be present at all times to carry out the work under harsh conditions, full of noise and difficult-to-collect dust.

- The aforementioned French Patent No. 2,350,407 discloses a device for crushing scale by pressure and impact. This device is of semi-gantry type (semi-portiq).
It can be attached to the operating machine of ue) and operates on the electrolytic cell when taking out the consumable l-9 anode.

The above-mentioned device is already adapted to the various requirements of today regarding the collection and disposal of fluorinated wastes.1. I don't get it. This is because, in order to use this device, the part of the electrolytic cell to be treated must be left open 17, and as a result, this part comes into contact with the air and the fluorine part emanates into the atmosphere, resulting in a disturbance in the thermal equilibrium. It is.

Additionally, French Patent No. 2324761 (U.S. Patent No. 40495) in the name of ALUMINIUM PECHINEY
No. 18), No. 2333060 (U.S. Pat. No. 40725)
No. 97), No. 2343826 (U.S. Pat. No. 40909)
30-1, No. 2423554 (U.S. Patent No. 4210
No. 514), No. 2425482, national suspension permit No. 41690
No. 34), No. 2427760 (U.S. Pat. No. 42005)
Due to the functional conditions of modern electrolyzers, such as the 180,000 amp alumina electrolyzer disclosed in No. Because the extremely hard and thick electrolyte scale solidifies on the surface, mere vibration or a simple pneumatic tool cannot remove the scale on the anode coating.

SUMMARY OF THE INVENTION An object of the present invention is to provide a method for removing electrolytic bath residue on a consumable anode element taken out from an electrolytic bath for producing aluminum by the Hall L method by scraping and dropping 17. . The anode element is [meso (m5got
) contains a carbon residue called J, and the legs welded to the suspension rods are embedded in the meso of the. In this removal method, these worn-out anode elements are placed on a frame that is tilted about a horizontal axis.1. , the underframe is brought down to bring the suspension rod almost horizontally, and it is attached to the leg and meso.
The electrolyte residues present in the bath are crushed under the action of impact, static pressure and a tool which performs the function of crushing, and finally the bath residues falling under the force of gravity are collected in the receiving means.

Crushing of the electrolyte residue is carried out in several successive steps, and in each step the anode element is rotated in a limited manner around an axis that approximately coincides with the axis of the suspension rod. It's good to do that. In this case, the fragmentation of the residue is caused in all stages by the movement of the tool due to the above-mentioned impact and static pressure, with the axis held vertically, i.e. parallel to the vertical axis and the tilting axis of the frame. This is carried out by a combination of movement and movement parallel to the vertical axis and perpendicular to the tilting axis.

The invention is also directed to an apparatus for carrying out the method described above, comprising the following elements:

- a frame comprising at least one support member for a worn out anode element; - means for tilting the frame about a horizontal axis; - means for rotating the support member; - means for scraping off electrolyte residue; A means of collecting electrolyte residues.

Below, attached figures 1 to 4 showing various parts of the device are shown.
A more detailed explanation will be provided based on the figures.

However, these drawings merely show specific examples and do not limit the present invention.

=8- The device shown consists of two separate parts that cooperate 17 with each other to produce the overall result: a support for tilting the anode element and a scraping 17 device.

1) Anode element tilt - Y7J Zeit The support performs the following functions.

- A function of receiving the consumable anode element sent from the electrolytic chamber by holding the support rod in a vertical position, - A function of arranging and fixing the anode element, and a function of tilting the anode element to the position of "#tl". −
A function of rotating the anode element in a limited and continuous manner around an axis that approximately coincides with the axis of the suspension rod.1 Recovery of electrolytic bath residue.

The tilting support is essentially formed by a beam 1 and has a frame, which is rotated by a motor (not shown) about an axis 2 on a shaft bearing 3.3'. The beam-shaped support 1 supports one or more (three in the figure) anode support members 5 with guides 6 used for positioning and centering the anode elements, while capturing and chaining the suspension rods 8. The locking devices 7 are also supported in the same number as the supporting members. Each anode element includes a buried leg 9 and a carbon meso 10. On one of these anodes, a dotted line I7 indicates the limit of the range that can be occupied by the electrolyte scale to be removed. Each anode support member 5
is provided with motorized means 11 for separately rotating each of the anodes about an axis 12 substantially coinciding with the axis of the rod 8.

The anode rod locking device 7 on the support arm 13 has several novel characteristics. That is, the device has a fixed part 14 and a rotating part 15 consisting of two identical elements 15a and 15b. The rotating part is fastened to the fixed part with a bolt 16 with a gap that allows sufficient rotation.

These rotating elements 15a and 15b have 9 cutouts 17 that match the cross section of the suspension rod 18. ing.

The fixing part 14 is fixed to the support arm 13 via a bolt 18 and a buffer block 19 made of rubber or other elastomer. The fastening part also rests on the support arm 13 via two rubber stops 20, which significantly reduce the transmission of vibrations from the descaling device to the underframe.

If you use such a device, each anode can be scraped off.1. 1 for the device. , can be placed in the most advantageous sequential position for rapid and complete removal of electrolyte bath residue.

The beam-shaped underframe l rotates 17 about its own axis under the action of a jack 21, usually with the rod 8 being horizontal or at a relatively small angle with respect to the horizontal, such as, but not limited to, about 20' or less. Obtain 900 revolutions 17 to tilt the anode to a position such that it forms an angle.

In this embodiment, the underframe is rotated to place the suspension rod on the side of the impact device.

In the tilted position, the anode is placed above a device that collects bath scale by gravity.

In this embodiment, the recovery device has a grid 22 with holes sized to allow the salt blocks detached from the anode to pass through.
-I am. The maximum dimensions of the grid are selected to accommodate subsequent processing equipment.

A funnel (not shown) is arranged below the iron grate 17 through which the electrolyte residue is conveyed to a belt conveyor for transport to known recycling equipment (magnetic iron removal, grinding, calibration, etc.). It's okay.

Advantageously, the device is equipped with a vacuum cleaner which operates in the space between the anode support member and the grid. In this case, the channel 23 is connected to a vacuum cleaner equipped with a suitable filter.

2) Chip removal device 17 This device has a so-called chip removal function, that is, a function of crushing the electrolytic bath scale covering the meso-upper part of the anode by impact and static pressure.

Theoretically, it is possible to perform this operation with pneumatic equipment, but it is necessary to apply static pressure and impact simultaneously, and to adjust the amplitude and frequency to be optimal for the specific conditions of this operation. It has been found that the work can be carried out faster, more effectively and more completely using a hydraulically controlled impact tool.

A hydraulic [concrete breaker] type tool is perfect.

The tool 24, suitably with a one-shaped tip 25, rests on a multi-articulated articulated arm 26. The arms are controlled by hydraulic jacks 32 and 33, allowing the tool to be moved in various ways while always keeping its axis 34 substantially vertical.

The arm in this example moves the impact tool 24 horizontally with an amplitude of 0.5 m and vertically with an amplitude of 1.5 m.

Furthermore, the assembly consisting of the arm 26 and the control jack 32, 33 is moved parallel to the beam frame 1. The anode support member can be placed at any arbitrary position on the anode support member.

If you combine these three types of motion, the vine will be 17-shaped tip 2
5, electrolyte bath residue accumulates on each anode element; 7, the volume obtained can be approached entirely.

Advantageously, these arms and jacks are fixed to the cabin 35, which can be moved on rails 36 by operation of an operator. The cabin 35 is preferably soundproofed and supplied with ambient air so that the operator can work under favorable conditions.

is o, o o o If a cough device is used on the consumable anode element removed from the ampere electrolytic bath, it can be removed from the electrolytic bath in less than 5 minutes under conditions that are perfect from both hygiene and safety points of view. It becomes possible to remove the residue.

[Brief explanation of drawings]

FIG. 1 is a general illustration of the apparatus of the present invention, with the anode element shown in the receiving position (dotted line) and in the scraping position (solid line);
Figures 2 and 3 are cross-sectional and plan views of a device for supporting, immobilizing, tilting and rotating three consumable anode elements arranged side by side in a row; Figure 4 is a suspension rod chain; FIG. 3 is a detailed view of the locking device. 1... Underframe, 3, 3'... Bearing, 5... Anode support member, 6... Guy P. 7... Capture locking device, 8... Suspension rod, 9
...Leg, 1o...Me J1 21, 32, 33...Jackie, 22...
Lattice, 24... impact tool, 26... articulated arm,
35... Cabin. Procedural amendment (formality) 1. Indication of matter A1 1982 patent application No. 18268
No. 4, No. 2, Title of the invention: Method for removing residual electrolytic bath on a pre-fired anode by scraping off, and 11. 3. Relationship with the amended person's case Name of patent applicant: Aluminum Becinet 4, Agent: Shinjuku, Tokyo Shinjuku 1-1-14 Yamada Building (
Postal code 160) Telephone (03) 354-8623 (
(2) In the attached drawings, Figure 4 has been amended to Figures 4a and 4b as shown in the attached sheet. (No change in content) 1. The simplified version of the drawing is
(Dotted line) where 21 falls 1/stomach (solid line) and (J) Overall explanatory diagram of the device of the present invention, Figures 2 and 3 [
,1 Line up in a row ``?That's it!The three places are 11321!1N
Support, immobilization, tilting and rotation designed for ir
111 is a cross-sectional view and a wavy plan view of the 11 mount, Fig. 4a is a detailed view of the suspension 1-1 rad locking device, Fig. 4b is a
Cross-sectional view along line 88 in Figure 88 (Pa is included. 1...Underframe, 3.3'...Bearing, 5...Anode support part shrine, 6...10,000 id, 7...Capture lock Equipment, fl...suspension [1 leg, 9 leg,
'I O... May, 21.32. J33...J1
7 to 1, 22...Grating 24...Impact -1"fA,
26...Articulated arm, 35...Ki 171 gon.

Claims (8)

[Claims] (1) A method for removing electrolytic bath residue by scraping off a consumable anode element taken out from an electrolytic bath for producing aluminum by the Hall-Hello method, and the anode element is called "Meso". It has a carbon residue called 1. Legs welded to the suspension rods are inserted into the Isamego, and these consumable anode elements are placed on an underframe that is tilted around a horizontal axis (17), and the skeleton underframe is tilted (1). The suspension rod is brought approximately horizontally (17), and the electrolyte residue adhering to the legs and the carbon-containing meso is crushed under the action of a tool that works by impact and static pressure, and falls off by gravity. A method for removing electrolytic bath residue, characterized in that the residue of the electrolytic bath is collected in a receiving means. (2) Crushing of the electrolyte bath residue is carried out in a number of successive stages17, characterized by limited rotation of the consumable anode element about an axis that approximately coincides with the axis of the suspension rod between each stage. A removal method according to claim 1. (3) The electrolyte bath residue crushing operation at each stage is a combination of impact and static pressure crabbing tool movement along the vertical axis of the tool, i.e. movement parallel to the vertical axis and the tilting axis of the underframe; The removal method according to claim 2, characterized in that it is carried out in combination with a movement parallel and orthogonal to the tilting axis of the underframe. (4) an underframe having at least one support member for a consumable anode element, means for tilting the underframe about a horizontal axis, means for rotating the support member, and means for scraping off electrolyte bath residue; An apparatus for carrying out the method according to any one of claims 1 to 3, characterized in that it comprises a means for recovering electrolyte bath residue. (5) The means for scraping off electrolyte bath residue has a pickaxe-like member fixed to a vibratory and static pressure generator having a substantially vertical axis, and the means is arranged along the vertical axis according to the vertical axis. 5. Device according to claim 4, characterized in that it is connected to means for moving in parallel. (6) The consumable anode element support member has a locking means for the suspension rod, and the locking means is composed of a fixed part and a rotating part consisting of two identical elements, and both of these parts are It is tightened to the fixed part with a number of bolts to create a gap sufficient for the element to rotate around an axis that approximately coincides with the axis of the suspension rod P, and approximately conforms to the cross section of the suspension rod. 5. The device according to claim 4, wherein cutouts are formed in both elements. 7. A device according to claim 6, characterized in that the fixing part is fixed to a support arm by a bolt, and the support arm is isolated from the bolt by vibration damping means. (8) A device according to claim 6 or 7, characterized in that the fixed part of the locking means is still in contact with the support arm via vibration damping means.