KR810000246B1 - How to remove the spent anode butt of molten salt electrolyzer - Google Patents

Abstract

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Description

How to remove the spent anode butt of molten salt electrolyzer

1 is a front view of an apparatus for implementing the method of the present invention in a stationary position in the vicinity of an electrolyzer to extract one exhausted anode.

2 is a front view of the apparatus as seen from the other side of the right angle.

3 is a front view of the device as it progresses to operate on the depleted anode that has been withdrawn from the electrolytic cell.

4 is a plan view of the apparatus at the position of FIG.

5 is a front view of the apparatus in the process of pulverizing the solidified electrolyte crust surrounding the bart.

The present invention relates to a method for removing spent anode butts from a molten salt bath.

In the electrolytic cell used for the production of aluminum by molten salt electrolysis, oxygen generated by the decomposition of alumina burns the inner surface of the carbon anode, so it is necessary to update the anode material at some regular cycle.

In an electrolyzer with a ready baked anode, the anode is made up of several paralleled carbons that are alternately replaced by consumption.

The part of the consumed anode attached to the support is usually called butt.

In place of the anodes, the solidified electrolyte crust surrounding these carbon shocks must be removed to recover the electrolyte and carbon separately for reuse.

This removal can be done either in a special workshop where the bar to be removed is assembled or in the electrolytic cell itself, in the latter case there is no handling and loss of the product. Moreover, in the latter case, the electrolyte crust can be separated more easily than after total cooling.

In any case, such work which is usually performed by a conventional apparatus requires a lot of labor for the worker in an environment of adverse conditions caused by dust and heat.

The present invention is installed on an operating device such as an expensive crane, a velocipede crane, a gantry, or an independent self-propelled device used in an electrolytic chamber. The present invention relates to a method for removing the bar batt by means of a device which can be mounted on or installed in a fixed position in a special workplace.

This bart removal device essentially includes a pneumatic pick of known type and is provided with a striking tool supported on a segmented arm, which arm operates the device on which the arm is mounted. It is operated by remote control from the room.

Thus, the operator is protected from heat and dust and placed in the best position to strike the electrolyte crust surrounding the anode bar withdrawn from the electrolyzer to control the pneumatic pick.

The above-described device for carrying out the invention is illustrated in the accompanying drawings, in which the device is shown suspended on an elevated crane.

In the electrolytic cell shown in the figure, the current provided by the anode bar 1 is the aluminum rod 3, the steel ingot 5, the steel bar held by the clamp 4 to the anode bar 1. V) continuously supplied to Liquid Electrolyte 2 through 6 and Carbon Bars 7, 8.

By the current, oxygen generated from the alumina dissolved in the electrolyte 2 liberates and combusts the inner surface of the anode mass and gradually reduces the carbon mass 7 of the new anode to the size of the carbon mass 8 of the consumed anode.

In this exhaustion phase, this anode must be replaced with a new anode. For this purpose, an apparatus installed under the trolley 9 of the elevated crane (not shown) is used. The operator operates the control panel 11 in the operating room 10, releases the clamp 4 by the hydraulic key 12, extracts the positive electrode 8 consumed by the pneumatic key 13, and the adjacent positive electrode at the positions shown in FIGS. Let's lean on rod 6 of.

Thus, the exhausted anode is in a suitable position to remove the solidified electrolyte crust 14 surrounding the anode by the apparatus, and the operator can operate the control panel 11 in the operating room 10 to start the following work steps. .

In the first step, the pneumatic pick 15 with the tool 16 is moved by the action of two hydraulic jacks from the stop position shown in FIGS. 1 and 2 to the working position shown in FIGS. 3 and 4 Jack 17 carries the device vertically by arm 17, and Jack 19 lowers cradle 20 until the pneumatic pick and the tool are in the horizontal position.

In the second stage, the operator supplies compressed air to the pneumatic jack 21, advancing the pneumatic peak 15 until the striking tool 16 contacts the solidified electrolyte crust 14, and at the same time, supplying the compressed air to the pneumatic pick to impart a blow action. The blow action causes the crust to break into the vagina as shown in FIG. 5 and the blow tool to pass to the right.

In the third stage, if crust 14 is not completely destroyed, the operator uses jack 17 to move the device to the other side and resume the operation, at all positions between positions 16-1 and 16-2 shown in FIG. Strike Tool 16 hits Crust 14.

In another embodiment of the method, the striking tool 16 is subjected to a predetermined level of resistance in a known manner when striking the pneumatic pick. Thus, when the crust 14 is not so hard that it is crushed even under the simple rushing effect exerted by the jack 21, the energy required for the hit can be saved.

Other types of pneumatic picks may be used to practice the present invention. However, it has been found that the highest efficiency is obtained by high performance hammers such as those used in civil works.

Since the electrolyte crust adheres to the positive electrode bart, it is preferable that the rushing force due to the jack 21 is at least 300 daN.

The method of the present invention is particularly suitable for removing the baht of the positive electrode extracted from the molten salt electrolytic cell for the purpose of recovering the electrolyte crust attached to the positive electrode in the production of aluminum by molten salt electrolysis.

The present invention allows the operator to be protected from dust, toxic gases, heat and noise, almost all electrolytes can be recovered and it is easy to re-install new anodes in the anode support rods cleaned in this way.

The above-described apparatus may be installed in any type of electrolyzer operation apparatus such as elevated crane, non-lose feed crane, semi-gantry, self-propelled apparatus, trolley. The apparatus may also be used to clean the spent positive electrode at a fixed location slightly away from the electrolytic cell.

Claims (1)

A method for removing the consumed anode bart, which is a solidified electrolyte crust surrounding the anode, when the anode is replaced in a molten salt electrolytic cell for manufacturing aluminum, the consumed anode vertically from the cell to a certain level on the surface of the cell. Raise, support the raised anode on one side, match the electrolyte crust with the striking tool on the other side of the anode, move the striking tool toward the contact of the crust of the raised anode, and quickly move the striking tool Operating to strike the crust to crush the crust from the consumed anode and control such movements in a remote control room.

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