Electrolyzer circumfluence calcination method

An electrolytic cell and roasting technology is applied in the field of roasting and preheating the electrolytic cell, which can solve the problems affecting the normal start-up and production of the electrolytic cell, the inability to conduct timely conduction of high temperature, and the large temperature gradient of the cathode carbon block, etc., so as to improve the roasting effect, The effect of shortening the firing time and avoiding thermal stress concentration

Active Publication Date: 2009-10-07
YUNNAN RUNXIN ALUMINUM
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

When using this furnace loading method for preheating, because the roasting tank is full of materials, the locally generated high temperature cannot be conducted in time, so that local over-burning, under-burning or Problems such as local enrichment of sodium make it difficult to preheat roasting, which affects the normal start-up and production of the electrolytic cell. At the same time, a large amount of limited resource cryolite is consumed, resulting in increased costs

Method used

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  • Electrolyzer circumfluence calcination method

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Embodiment 1

[0023] The electrolytic cell circulation roasting method provided by the present invention comprises the steps of filling the cell and energizing roasting, specifically through the following steps (such as figure 1 shown):

[0024] A. A heating medium layer 3 is laid on the surface of the cathode carbon block 2 in the tank body 1. The thickness of the heating medium layer 3 is 1.8cm, and the material is coke particles. Afterwards, the anode 4 is installed on it, and the anode 4 and the heating medium are ensured. Layer 3 contact is good;

[0025] B, the top of the gap between the anodes 4, the top of the middle slot cavity 8 and the top of the edge cavity 5 are laid with a high temperature resistant insulating and heat insulating layer 6, the thickness of the high temperature resistant insulating and heat insulating layer 6 is 1cm, and the material is Asbestos board, in order to use high-temperature flue gas circulation to evenly roast the entire cathode lining, and at the sa...

Embodiment 2

[0029] The electrolytic cell circulation roasting method provided by the present invention comprises the steps of filling the cell and energizing roasting, specifically through the following steps (such as figure 1 shown):

[0030] A. Lay a heating medium layer 3 on the surface of the cathode carbon block 2 in the tank body 1. The thickness of the heating medium layer 3 is 2.5cm, and the material is graphite. After that, the anode 4 is installed on it, and the anode 4 and the heating medium layer are kept. 3 contacts;

[0031] B, the top of the gap between the anodes 4, the top of the middle slot cavity 8 and the top of the edge cavity 5 are laid with a high-temperature-resistant insulating and heat-insulating layer 6, and the thickness of the high-temperature-resistant insulating and heat-insulating layer 6 is 1.5cm. It is made of aluminum silicate fiberboard, so that the entire cathode lining can be evenly roasted by high-temperature flue gas circulation, and at the same ti...

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Abstract

The present invention provides electrolyzer circumfluence calcination method, when installing the electrolyzer, between the anode seam, center seam and inside edge cavity are provided with no materials, installing the electrolyzer in full cavity mode, then using the medium generated heat to calcine cathode lining of the electrolyzer in multiple heat transferring modes of radiation, convection and heat transmission etc, smoke generated by pressure difference during calcination circumfluence in the electrolyzer to make sure calcination temperature of all the sections is uniform, and avoids problem of heat stress centralization and sodium enriching in part effectively; a high-temperature insulation thermal insulating layer is lay in anode seam cavity, center seam cavity and top of edge cavity in the electrolyzer for reducing heat loss effectively, improving warming speed, shorting calcination time, saving energy sources and helpful for earlier regular production of the electrolyzer, meanwhile can reduce calcination energy consumption effectively and improve affect of radiation on operation environment; and the most important is that, using full electrolytes powder to instead of cryolite can reduce calcination startup cost greatly.

Description

technical field [0001] The invention relates to a roasting method for an electrolytic tank, in particular to a method for roasting and preheating an electrolytic tank, belonging to the technical field of electrolysis. technical background [0002] With the development of large-scale, large-scale and automated production of electrolytic aluminum enterprises, and the promotion of measures such as emphasizing environmental protection, improving production efficiency, reducing energy consumption, and prolonging the service life of equipment, newer and higher aluminum electrolysis technology has been proposed. requirements. At present, the aluminum electrolytic production process includes the roasting and preheating of the aluminum electrolytic cell, starting and controlling the electrolytic production, etc. Among them, the roasting preheating is an important link in the aluminum electrolytic production process. Lining, make the roasting temperature close to or reach the normal ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C25C3/06
Inventor 田永张春生苏其军赵晓松马骅勇秦雪云杨万章杨金星邢大庆
Owner YUNNAN RUNXIN ALUMINUM
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