Method for welding cathode flexible bus of aluminum electrolysis cell without series power failure

Abstract

The invention relates to the industry of electrolytic aluminum, and in particular to a method for performing repair work under the condition of no series power failure in the occurrence of damage to a cathode flexible bus of an aluminum electrolysis cell. The method provided by the invention comprises following steps: 1. steps of removing, grinding and flattening; 2. a step of welding a transition aluminum block; 3. a step of welding an explosion block; 4. a step of making preparation for welding; 5. a step of filling a heat release welding flux; 6. a step of heating a welding part; 7. a step of ignition; and 8. removing a mould after naturally cooling a cavity; performing insulation treatment on the welding part and slowing the cooling in places where the climate is cold; and after the completion of the welding, cleaning a site. With the adoption of the method provided by the invention, the cathode flexible hose of the aluminum electrolysis cell can be welded without the series power failure; due to good generality, the method is applicable for various slots; in such a way, the series power failure of the electrolytic cell is prevented, the ferrous welding under a strong magnetic field is prevented, and the condition that the heat release welding cannot be directly used for the flexible bus with a laminated structure is prevented; and therefore, the economic benefits of an aluminum electrolysis enterprise are improved, and the technical difficult in repairing the cathode flexible bus is solved for the aluminum electrolysis enterprise.

Description

technical field [0001] The invention relates to the electrolytic aluminum industry, in particular to a method for repairing the cathode soft busbar of an aluminum electrolytic cell when it is damaged without power failure. Background technique [0002] , existing technology [0003] 1) Yuncheng Guanlu Equipment Material Co., Ltd.'s patented technology "An Anti-magnetic Interference Arc Welding Device". At the end of 2008, a successful welding test was carried out on the anode balance busbar of a 190KA electrolytic cell. In the continuous research and development test in 2009, three-dimensional combined shielding, electromagnetic shielding protection, and safe operation protection were used to adjust the test. In October 2009, the non-stop welding test was successful. It has completely solved the world-class problem that the electrolytic cell above 300KA cannot be welded to the busbar at all without power failure; it will save energy, reduce emissions, and reduce production ...

AI Technical Summary

Problems solved by technology

Disadvantages: First, it is necessary to design and manufacture different electromagnetic shielding devices according to different welding parts of the busbar. Different electrolytic cells and different welding parts have different shielding devices, and the versatility is not good; Parts where electromagnetic shielding cannot be performed due to narrow space” There are uncertainties in the application of this technology; 3. Electromagnetic shielding devices must be used

[0008]The disadvantage of this method is that the soft busbar cannot be welded

[0010]The disadvantage of this method is: the soft busbar cannot be welded

[0011]5) Guiyang Aluminum and Magnesium Design and Research Institute Co., Ltd. Yang Tao; Wang Ziqian and others applied for an invention patent on December 26, 2011 "Aluminum electrolytic cell through-fluid non-stop welding control system ” Discloses a welding control system for aluminum electrolytic cell through flow without interruption, which includes maintenance tank (1), downstream tank (2) and busbar system (5), installed between maintenance tank (1) and downstream tank (2) The mechatronic shunt device (3), the mechatronic shunt device (3) and the busbar system (5) are equipped with thermoelectric sensors on the surface, and the thermoelectric sensors are electrically connected to the expert guidance and the process monitoring unit (4); The thermite reaction method used in the power failure welding technology has high requirements on the space size of the welding position. The service life of the special thermite container is short and the cost is high. The formula of the reactant needs to be explored and determined, and there is a certain danger. The magnetic field shielding method has magnetic conductive materials. It is easy to be magnetized, the shielding effect is not obvious, and the operation is difficult, etc.

[0012]The disadvantages of this method are: 1. The use of pyroelectric sensors and process monitoring unit diversion devices, the equipment itself is of high value; 2. The operation process is complicated and requires more labor and equipment; 3. To divert the series of currents, there must be safety risks in the series of electrolyzers

[0015] Exothermic welding has been used in many industrial fields. Aluminum-aluminum exothermic welding has been used more and more in the electrolytic aluminum industry in recent years. Due to the The activity is stronger than other exothermic welding metals, so welding is more difficult and the welding success rate is relatively low, but the current domestic technology in aluminum-aluminum exothermic welding is still relatively mature

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