Cathode for dovetail groove type aluminum electrolytic cell

The technology of aluminum electrolytic cell and dovetail cell is applied in the field of improvement of cathode group structure of double dovetail cell or multi-dovetail cell, which can solve the problems of small conductive area of ​​cathode steel rod, large pressure drop of iron and carbon, leakage of furnace, etc. The effect of low operating cost, reduced iron and carbon pressure drop, and reduced production cost

Inactive Publication Date: 2016-02-24
GUIZHOU BRANCH CHINA ALUMINUM IND
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The cathode of the existing double-dovetail or multi-dovetail tanks of large-scale tanks uses two cathode steel rods, and the use of widened steel rods to increase the conductive area is very limited, so that the conductive area of ​​the cathode steel rods is relatively small, so that the iron-carbon The voltage drop is larger, resulting in a larger voltage drop at the bottom of the furnace, a larger horizontal current, and a larger energy consumption, which is a major problem that plagues enterprises.
Due to the small conductive area of ​​the current cathode steel rod, it is easy to cause the temperature of the cathode steel rod to be too high, damage the cathode carbon block, and even cause leakage of the furnace in severe cases, which brings a lot of inconvenience to production

Method used

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  • Cathode for dovetail groove type aluminum electrolytic cell
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  • Cathode for dovetail groove type aluminum electrolytic cell

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Experimental program
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Effect test

Embodiment 1

[0028] Such as figure 2 As mentioned above, the Q195 type steel is used as the steel rod, and the ordinary carbon block is used as the cathode carbon block. The entire cathode steel rod runs through the cathode carbon block. The buffer structure at the end of the rod is arc-shaped. Use tamping paste at the end position where the steel rod contacts the carbon block, and the two sides of the steel rod inside the carbon block adopt an arc-shaped concave shape. The cathode steel rod is 100mm from the side of the cathode carbon block, and the cathode steel rod is 250mm from the upper part of the cathode carbon block. Compared with the structure of the traditional cathode group, the voltage drop of this cathode group is reduced by 110mV, the horizontal current is reduced by 41%, and the power consumption per ton of aluminum can be reduced by 980kWh.

Embodiment 2

[0030] Such as image 3 As mentioned above, pure iron is used as the steel rod, and a semi-graphite carbon block is used as the cathode carbon block. There are 3 connection points at the position where the end of the cathode steel rod is connected to the peripheral busbar, and the cathode steel rods are distributed at both ends of the cathode carbon block. , the middle of the cathode steel rod is not connected, and the buffer structure at the end of the cathode steel rod is a triangle. A boss structure is used around the contact between the steel rod and the carbon block to increase the contact area and increase the strength. The cathode steel rod is 180mm from the side of the cathode carbon block, and the cathode steel rod is 200mm from the upper part of the cathode carbon block. Compared with the structure of the traditional cathode group, the voltage drop of this cathode group is reduced by 140mV, the horizontal current is reduced by 45%, and the power consumption per ton ...

Embodiment 3

[0032] Such as Figure 4 As mentioned above, pure copper is used as the cathode conductive steel rod, and a fully graphitized carbon block is used as the cathode carbon block. There are two connection points at the position where the end of the cathode steel rod is connected to the peripheral busbar, and the entire cathode steel rod runs through the cathode carbon Blocks, steel rods adopt grooves around some steel rods inside the carbon block to increase contact strength. The cathode steel rod is 120mm from the side of the cathode carbon block, and the cathode steel rod is 280mm from the upper part of the cathode carbon block. Compared with the structure of the traditional cathode group, the voltage drop of this cathode group is reduced by 130mV, the horizontal current is reduced by 42%, and the power consumption per ton of aluminum can be reduced by 1000kWh.

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Abstract

The invention relates to an improvement of an aluminum electrolytic cathode set structure, in particular to an improvement of a double-dovetail-groove or multi-dovetail-groove cathode set structure for large grooves, and discloses a cathode for a dovetail groove type aluminum electrolytic cell. The cathode structurally comprises a cathode carbon block and a cathode steel rod which are bonded through combined materials. The cathode is characterized in that the number of the cathode steel rod bonded through the combined materials in the cathode carbon block is one; the distance between the cathode steel rod and the side of the cathode carbon block is 50 mm-180 mm; and the distance between the cathode steel rod and the upper portion of the cathode carbon block is 150 mm-300 mm. Compared with the prior art, the cathode has the beneficial effect of greatly lowering voltage drop of ferric carbon; the limitation for electric conduction increasing through steel rod widening is broken through; quite remarkable functions for lowering furnace bottom voltage drop, lowering the horizontal current and reducing the furnace leakage risk are achieved; and meanwhile, the structure is simple, the manufacturing and running cost is low, and the production cost of electrolytic aluminum can be effectively reduced.

Description

technical field [0001] The invention relates to a cathode for a dovetail groove type aluminum electrolytic cell, which relates to the improvement of the structure of the aluminum electrolytic cathode group, especially for the improvement of the double dovetail groove or multi-dovetail groove cathode group structure of a large-scale cell. Background technique [0002] The aluminum electrolytic cell is the main equipment for aluminum smelting. Electrolytic aluminum is a high energy-consuming industry, and reducing energy consumption is of great significance to electrolytic aluminum. In order to reduce the energy consumption of electrolytic aluminum, it is a very practical and effective measure to reduce the pressure drop of various parts of the electrolytic cell, especially the pressure drop of the cathode. [0003] The cathode of the aluminum electrolytic cell is an important part of the electrolytic cell. It is a cathode assembly composed of cathode carbon blocks, cathode st...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C25C3/08
Inventor 邱仕麟史志荣周云峰柴登鹏李昌林黄海波侯光辉汪艳芳张延利方斌
Owner GUIZHOU BRANCH CHINA ALUMINUM IND
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