Bipolar electrode plate for preparing metal aluminum by aluminum chloride electrolysis and a method of using same

A bipolar electrode and metal aluminum technology, applied in the field of electrolytic aluminum, can solve the problems of reducing current efficiency and increasing energy consumption

Active Publication Date: 2020-06-12
NORTHEASTERN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] However, in the multi-chamber electrolytic cell used in the aluminum chloride molten salt electrolysis method, due to the existence of bypass current, the current efficiency will be reduced and the energy consumption will be increased.

Method used

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  • Bipolar electrode plate for preparing metal aluminum by aluminum chloride electrolysis and a method of using same
  • Bipolar electrode plate for preparing metal aluminum by aluminum chloride electrolysis and a method of using same
  • Bipolar electrode plate for preparing metal aluminum by aluminum chloride electrolysis and a method of using same

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0047] A bipolar electrode plate for the electrolysis of aluminum chloride to prepare metal aluminum, the schematic diagram of its three-dimensional structure is shown in figure 1 , see its left view figure 2 , specifically including a bipolar electrode plate base block 3 and an insulating block 5, the bipolar electrode plate base block 3 is divided into a cathode end 303 and an anode end 301, in the bipolar electrode plate base block 3, except for the cathode end 303 and the anode end 301 The end face of the anode end 301, and the remaining surroundings are provided with connecting insulating blocks, and the width of the insulating blocks needs to satisfy the following relationship:

[0048] (ρ C ·h+2.15 / D·S)L ·(b+h)

[0049] In the above formula, ρ C is the resistivity of the base of the bipolar electrode plate, in Ω cm; h is the thickness of the base of the bipolar electrode plate, in cm; ρ L is the resistivity of the electrolyte, the unit is Ω cm; D is the current den...

Embodiment 2

[0063] A bipolar electrode plate for the electrolysis of aluminum chloride to prepare metal aluminum, the schematic diagram of its three-dimensional structure is shown in Figure 4 , specifically including a bipolar electrode plate base block 3 and an insulating block 5, the bipolar electrode plate base block 3 is divided into a cathode end 303 and an anode end 301, in the bipolar electrode plate base block 3, except for the cathode end 303 and the anode end 301 On the end face of the anode end 301, an insulating block is provided on the outer periphery of the bipolar electrode plate and the wall of the central hole, and the width of the insulating block needs to satisfy the following relationship:

[0064] [ρ C ·h+2.15 / D·S]L ·(b+h)

[0065] In the above formula, ρ C is the resistivity of the base of the bipolar electrode plate, in Ω cm; h is the thickness of the base of the bipolar electrode plate, in cm; ρ L is the resistivity of the electrolyte, the unit is Ω cm; d is th...

Embodiment 3

[0085] A bipolar electrode plate for preparing metal aluminum by electrolysis of aluminum chloride is the same as in Example 1.

[0086] An electrolytic cell based on aluminum chloride electrolysis in this embodiment to prepare a bipolar electrode plate of metal aluminum, which is a square electrolytic cell structure, such as Figure 8 As shown, the electrolytic cell includes a shell, which is made of double-layer material, the outer layer is a stainless steel layer 101, and the stainless steel layer 101 is lined with refractory bricks. The system has a certain corrosion resistance. The lower part of the electrolytic cell is the aluminum storage area, which is used to store the liquid aluminum liquid flowing down from the cathode. In the aluminum storage area, the bottom and side walls of the shell are made of carbon material layer 104, and the carbon material layer is made of graphite.

[0087] The housing on the top of the electrolyzer is provided with an outlet for gettin...

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Abstract

The invention relates to a bipolar electrode plate for preparing metal aluminum by aluminum chloride electrolysis and a using method of the bipolar electrode plate, and belongs to the technical fieldof electrolytic aluminum. The bipolar electrode plate for preparing metal aluminum by aluminum chloride electrolysis comprises a bipolar electrode plate base block and an insulating block. The bipolarelectrode plate base block is divided into a cathode end and an anode end. In the bipolar electrode plate base block, the remaining periphery is provided with insulating blocks correspondingly exceptthe end surface of the cathode end and the end surface of the anode end. The width of the insulating block needs to comply with the following relation: (Rho<C>*h+2.15/D*S)<<Rho<L>*(b+h). According tothe bipolar electrode plate, the insulating block is connected to the bipolar electrode plate base block, and the width of the insulating block is defined, so that when the bipolar electrode plate for preparing the metal aluminum by aluminum chloride electrolysis, bypass current can be effectively reduced, current efficiency is improved, and the electrolytic energy consumption is reduced.

Description

technical field [0001] The invention relates to the technical field of electrolytic aluminum, in particular to a bipolar electrode plate for preparing metallic aluminum by electrolysis of aluminum chloride and a use method thereof. Background technique [0002] Traditional aluminum smelting is produced by cryolite-alumina molten salt electrolysis, the electrolysis temperature is in the range of 930-1000°C, and the raw material is alumina. In this method, the unit power consumption rate is 13-15kW·h / kgAl, and the industrial carbon anode participates in the anode reaction, which will be continuously consumed during electrolysis. Therefore, this method not only consumes a lot of power, but also needs to replace the anode every once in a while. , which also increases the labor intensity of workers; in addition, during normal electrolysis, the CO produced by the anode 2 And when the anode effect occurs, the anode generates CF 4 and C 2 f 6 Fluorocarbons are all greenhouse gas...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C25C7/02C25C3/12C25C3/08
CPCC25C3/08C25C3/125C25C7/025
Inventor 王兆文高炳亮胡宪伟石忠宁陶文举刘风国杨酉坚刘爱民于江玉王壮关月超
Owner NORTHEASTERN UNIV
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