Online repair method for local damage of aluminum electrolytic cell cathode

An aluminum electrolytic cell and electrolytic cell technology, which is applied in the field of repairing damaged parts of the cathode, can solve problems such as affecting production operation, reducing the serial slotting rate and production capacity, and exacerbating the problem, and achieves the effect of inhibiting continued damage and convenient and quick material acquisition.

Active Publication Date: 2016-02-17
云南云铝泽鑫铝业有限公司
View PDF3 Cites 14 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In this method, the materials used in the repair process cannot be quickly filled to the damaged position, and more materials will enter the undamaged part of the electrolytic cell. The "double balance" (material balance and heat balance) during the operation of the electrolytic cell It is damaged, which seriously affects the production operation; the repair quality is not high, and the repair materials are mixed with aluminum liquid, electrolyte, alumina and other substances. After the electrolytic cell has been in operation for a period of time, the repair materials in the damaged parts are gradually melted, and the damage still exists. even exacerbated
2. Suspended overhaul method
The first method is to reduce the slotting rate and production capacity of the series, while there is still a certain amount of power consumption for shutdown; the second is that the shutdown and overhaul cost of large-scale prebaked aluminum electrolytic cells is relatively high (such as a 400kA aluminum electrolytic cell shutdown and overhaul once The cost is about 1.5 million yuan)

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Online repair method for local damage of aluminum electrolytic cell cathode

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] The specific repair method is as follows:

[0026] 1) Propose the damaged part of the cathode and its adjacent anode, remove the shell block in the electrolyte of the lifted part, install a new pole in the position adjacent to the damaged part (no pole is installed at the damaged part), and connect the guide rod and the anode with an insulating plate After the bus bar of the beam is disconnected, it sinks to the bottom of the tank, making the anode of this piece non-conductive (such as figure 1 shown);

[0027] 2) Quickly put repairing material 1 in the damaged part of the cathode. The repairing material 1 is made by mixing the surface shell block and alumina in a mass ratio of 1:3. The surface shell block is the surface covering material of the electrolytic residual carbon block after cooling and crushing The repair material 1 makes the electrolyte in the area solidify in a short period of time. During the solidification process, the repair material 1 is continuously ...

Embodiment 2

[0037] The difference from Example 1 is steps 2) and 3).

[0038] 2) Quickly put repairing material 1 into the damaged part of the cathode. The repairing material 1 is made by mixing the shell block and alumina in a mass ratio of 0.8:2.5. The shell block is the surface covering material of the electrolytic residual carbon block after cooling and crushing The repair material 1 makes the electrolyte in the area solidify in a short period of time. During the solidification process, the repair material 1 is continuously put in, and the repair material 1 is pressurized by the head of the crown block to strengthen its solidification until the electrolyte in the damaged part Completely solidified, the aluminum liquid is completely discharged;

[0039] 3) When the temperature of the mixed material 1 at the damaged part drops below 400°C, remove the repairing material 1 at the damaged part of the cathode, and use the repairing material 2 prepared in advance, that is, fine magnesia, ant...

Embodiment 3

[0041] The difference from Example 1 is steps 2) and 3).

[0042] 2) Quickly put repairing material 1 in the damaged part of the cathode. The repairing material 1 is made by mixing the surface shell block and alumina in a mass ratio of 1.2:3.5. The surface shell block is the surface covering material of the electrolytic residual carbon block after cooling and crushing The repair material 1 makes the electrolyte in the area solidify in a short period of time. During the solidification process, the repair material 1 is continuously put in, and the repair material 1 is pressurized by the head of the crown block to strengthen its solidification until the electrolyte in the damaged part Completely solidified, the aluminum liquid is completely discharged;

[0043] 3) When the temperature of the mixed material 1 at the damaged part drops below 400°C, remove the repairing material 1 at the damaged part of the cathode, and use the repairing material 2 prepared in advance, that is, fine...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

PUM

No PUM Login to view more

Abstract

The invention provides an online repair method for local damage of an aluminum electrolytic cell cathode. When it is monitored that the content of iron in electrolytic cell primary molten aluminum rises abnormally, after the damaged portion of the electrolytic cell cathode is confirmed through the monitoring of the cell shell temperature, monitoring of the cathode square steel temperature and electrode extraction and furnace bottom groping of an electrolytic cell, the damaged portion of the cathode of the electrolytic cell is repaired on line. Compared with the prior art, the online repair method has the following beneficial effects that normal operation of the electrolytic cell is not affected; mixed materials used in the method are common or spare materials in electrolysis production, and the materials are obtained conveniently and fast without being specially purchased; the content of the iron in the repaired electrolytic cell primary molten aluminum can be decreased rapidly to be within the required range of aluminum ingot remelting; and further damage of the repaired portion can be inhibited through process adjustment and control over electrode change work.

Description

technical field [0001] The invention relates to the technical field of aluminum electrolysis production, in particular to a method for repairing damaged parts of cathodes in the normal operation state of an electrolytic cell on an aluminum electrolysis production line. Background technique [0002] During the production process of the aluminum electrolytic cell, due to reasons such as furnace building materials, furnace building technology and production management, the cathode furnace bottom will be partially damaged. If timely and effective treatment measures are not taken, it may lead to serious consequences of leakage. At present, the repairing techniques for the damage of the cathode of the aluminum electrolytic cell include: 1. The method of repairing the edge of the pole without stopping the cell. In this method, the materials used in the repair process cannot be quickly filled to the damaged position, and more materials will enter the undamaged part of the electrolyt...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

Application Information

Patent Timeline
no application Login to view more
Patent Type & Authority Applications(China)
IPC IPC(8): C25C3/08
CPCC25C3/08
Inventor 张建宇詹勇刚张鹏程王征白恩贵武明祖庹洪寸跃祖李官福李学文席洪平孙啸飞
Owner 云南云铝泽鑫铝业有限公司
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Try Eureka
PatSnap group products

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic.

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap