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Method for roasting aluminum electrolytic bath with polymorphic structure cathode

An aluminum electrolytic cell and cathode technology, which is applied in the field of aluminum electrolysis, can solve the problems of uneven distribution of cathode current, achieve the effects of overcoming uneven distribution of cathode surface temperature, uniform distribution of current and temperature, and overcoming local concentration of current

Inactive Publication Date: 2010-06-09
CENT SOUTH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to provide a method for firing aluminum electrolytic cells with special-shaped cathodes to solve the problem of uneven cathode current distribution after laying coke particles on the surface of special-shaped cathodes using traditional roasting methods

Method used

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  • Method for roasting aluminum electrolytic bath with polymorphic structure cathode
  • Method for roasting aluminum electrolytic bath with polymorphic structure cathode
  • Method for roasting aluminum electrolytic bath with polymorphic structure cathode

Examples

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Effect test

Embodiment 1

[0023] Taking the 300kA curved surface cathode and mesh cathode prebaked aluminum electrolytic cell as an example, for the curved surface cathode 5 (such as figure 1 ) and mesh cathode 6 (such as figure 2 ), the shape of the aluminum block coincides with the curved surface or the upper surface of the mesh cathode such as figure 1 and 2 As shown in the aluminum block 3, before laying the aluminum block 3, a layer of graphite powder or metal aluminum powder 4 with a thickness of 0.5 to 1 cm can be sprinkled on the curved surface cathode surface (such as figure 1 ), or directly lay the aluminum block on the cathode recess, so that the upper surface of the cathode is on the same horizontal plane, and then lay a layer of coke particles 2 with a thickness of 1 to 3 cm on the horizontal surface of the cathode after the aluminum block is filled (the particle size of the coke powder is 0.1 ~ 3mm), hang the anode 1, install the shunt, connect the anode guide rod and the anode bus bar...

Embodiment 2

[0025] Taking the 300kA trenched (protruded) cathode prebaked aluminum electrolytic cell as an example, for the trenched (protruded) cathode 8 (such as image 3 ), use aluminum powder 7 (0.1-5mm in particle size) to fill in the concave of the cathode, so that the upper surface of the cathode is on the same horizontal plane, and then lay a layer of coke particles 2 with a thickness of 1-3 cm on the horizontal surface of the cathode (the particle size of the coke powder is about 1~3mm), hang the anode 1, install the shunt piece, connect the anode guide rod and the anode busbar with a soft busbar, place the thermocouple according to the predetermined position, pile up the electrolyte block and put it in the furnace, bake it for 60~70h after power on, and the cell voltage From the initial 4.0 ~ 4.2V (impulse voltage is about 5.1 ~ 5.3V) gradually reduced to 2.1 ~ 2.3V, until the cryolite between the middle seam and the anode seam melts into a certain height (10 ~ 15cm) of electroly...

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Abstract

The invention discloses a method for roasting an aluminum electrolytic bath with a polymorphic structure cathode, which comprises the following steps of: filling a concave part on the surface of the polymorphic structure cathode with aluminum powder or aluminum blocks with shapes corresponding to that of the concave part to ensure that the filled surface and a convex surface of the polymorphic cathode are in the same horizontal plane; paving a layer of coke particles on a plane of the cathode; hanging an anode on the layer of the coke particles, and electrifying and roasting the aluminum electrolytic bath until 60 to 70 percent of the area of the surface of the cathode reaches or exceeds 900 DEG C; and when over 60 percent of the area in the electrolytic bath has a fused electrolyte with the thickness of 10 centimeters, infusing the electrolyte into the electrolytic bath to perform a wet method or adopt a dry method to start the roasting. The aluminum block / powder-coke particle composite roasting technique is favorable for the even distribution of the current and the temperature on the surface of the cathode and the reduction of heat vibration, thereby not only preventing an aluminum liquid roasting method from performing thermal shock on an inner lining of the cathode, but also solving the problems of uneven distribution of the current of the cathode and the like caused by large differences of the coke particle thickness when the aluminum electrolytic bath with the polymorphic structure cathode singly adopts coke particle roasting, and improving the roasting quality of the inner lining of the cathode.

Description

technical field [0001] The invention belongs to the technical field of aluminum electrolysis, and relates to a roasting method for a high-temperature molten salt aluminum electrolytic cell, in particular to a roasting method for a cathode aluminum electrolytic cell with a special-shaped structure. technical background [0002] The working temperature of the current aluminum electrolytic cells is as high as 960°C, and the aluminum electrolytic cells after new construction or overhaul are all built at room temperature. Therefore, the aluminum electrolytic cells after new construction or overhaul have to go through the roasting start-up process before entering the electrolysis work. Although the roasting start of the electrolyzer is only a few days, the roasting quality has a great impact on the working state of the electrolyzer after starting, especially on the life of the electrolyzer. [0003] At present, there are mainly three kinds of roasting methods for aluminum electrol...

Claims

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Application Information

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IPC IPC(8): C25C3/08
Inventor 吕晓军李劼赖延清丁凤其谢长春
Owner CENT SOUTH UNIV
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