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Method for reducing flow velocity and fluctuation of aluminum liquid in aluminum electrolytic bath

An aluminum electrolytic cell and electrolytic cell technology, which is applied in the field of the process of producing aluminum by electrolysis of alumina-cryolite molten salt, can solve the problem of high cost, difficult to solve the different characteristic requirements of cathode materials and blocking aluminum liquid materials, and low resistivity and resistance. Corrosion and other problems, to achieve the effect of low cost, simple construction, and reduction of molten aluminum fluctuations

Inactive Publication Date: 2010-05-05
GUIZHOU BRANCH CHINA ALUMINUM IND
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The characteristic of the electrolytic cell with this structure is that the barrier and the cathode are integrated, and it is difficult to solve the different characteristic requirements of the cathode material and the barrier aluminum liquid material. The cathode material is required to have the characteristics of low resistivity and strong corrosion resistance. The material pays more attention to corrosion resistance and does not require high conductivity. At the same time, once the barrier material is damaged, the entire cathode needs to be replaced, resulting in high cost

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] For a certain 160kA electrolytic cell, three barriers of cathode carbon material for aluminum with the size of length × width × height (4000mm × 100mm × 100mm) are installed in the horizontal direction of the electrolytic cell, and 10 barriers with the size of length × width × height ( 90000mm×200mm×200mm) aluminum cathode carbon material barrier, the lower surface of the barrier is 10mm away from the upper surface of the cathode. When the electrolytic cell is built, the side carbon block is specially processed to leave a groove with a square cross section. After the side carbon block is installed, the barrier body is installed on the groove, and the electrolytic cell is normally roasted and started.

Embodiment 2

[0023] For a 200kA electrolytic cell, 20 barriers of aluminum cathode carbon materials with a size of length × diameter (4200mm × φ150mm) are installed in the horizontal direction of the electrolytic cell chamber, and 7 barriers with a size of length × diameter (95000mm × φ150mm) are installed vertically. ) is a separator made of cathode carbon material for aluminum, and the lower surface of the separator is 50mm away from the upper surface of the cathode. When building the furnace for the electrolytic cell, reserve a groove with a circular cross-section at the installation position when tamping the artificial legs. After the furnace is built for the electrolytic cell, install the barrier body on the reserved groove, and the electrolytic cell will start firing normally. .

Embodiment 3

[0025] For a 280kA electrolytic cell in normal operation, 30 barriers of cathode carbon material for aluminum are installed in the horizontal direction of the electrolytic cell chamber with the size of length × cross-sectional major axis diameter × cross-sectional minor axis diameter (4300mm × φ200mm × φ80mm). Install 5 barriers of cathode carbon material for aluminum with the size of length × × cross-sectional major axis diameter × cross-sectional minor axis diameter (170000mm × φ300mm × φ200mm), and the lower surface of the barrier is 100mm away from the upper surface of the cathode. When the electrolytic cell is built, the barrier body is fixed on the legs of the aluminum electrolytic cell by using high-temperature glue stirred with phosphorus carbonate and water, and the electrolytic cell is normally fired and started.

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Abstract

The invention provides a method for reducing the flow velocity and the fluctuation of aluminum liquid in an aluminum electrolytic bath. The method is characterized in that an aluminum liquid region of the electrolytic bath is internally provided with transverse installing bar rod-shaped barrier bodies and lengthways installing bar rod-shaped barrier bodies. The sum of the widths of the cross sections of the bar rod-shaped barrier bodies arranged in the aluminum liquid region of the electrolytic bath are from 5- 60% of the lengthways length of the chamber of the electrolytic bath; and the sum of the widths of the cross sections of the lengthways bar rod-shaped barrier bodies are from 0- 50% of the transverse length of the chamber of the electrolytic bath. In the method for reducing the flow velocity and the fluctuation of the aluminum liquid in the aluminum electrolytic bath, the aluminum liquid fluctuation bar rod-shaped barrier bodies are independent relative to the negative poles of the electrolytic bath, do not break the structures of carbon blocks of the negative poles, and reduces the fluctuation of the aluminum liquid. The barrier bodies can be independently replaced once being broken with simple operation and low cost. The method can greatly reduce the flow velocity and the fluctuation of the aluminum liquid in the aluminum electrolytic bath, improves the current efficiency of the electrolytic bath, and stabilizes the electrolytic production.

Description

technical field [0001] The invention relates to a method for reducing the flow rate and fluctuation of molten aluminum in an aluminum electrolytic tank, which is suitable for the process of producing aluminum by electrolysis of alumina-cryolite molten salt. Background technique [0002] Under the influence of a strong magnetic field in the current industrial aluminum electrolytic cell, the cathode aluminum liquid in the cell will flow and fluctuate. In the case of extremely irregular shape in the furnace of the electrolytic cell, aluminum rolling will even occur, and the aluminum liquid will be sprayed into the cell External phenomena make the electrolytic cell unable to operate stably. The traditional method to reduce the flow and fluctuation of molten aluminum is to increase the height of molten aluminum and reduce the horizontal current in molten aluminum. Due to the fluctuation of aluminum liquid, the cell voltage of the current electrolytic cell is generally set betwee...

Claims

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Application Information

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IPC IPC(8): C25C3/08
Inventor 李旺兴赵庆云邱仕麟罗丽芬
Owner GUIZHOU BRANCH CHINA ALUMINUM IND