Preheating starting method for aluminium electrolysis cell

A technology for preheating and starting aluminum electrolytic cells, which is applied in the field of preheating and starting aluminum electrolytic cells. It can solve the problems of poor anti-disturbance performance of inert anodes and heating electrolyte, etc., and achieve the effects of reducing start-up costs, heating uniformly, and improving service life

Active Publication Date: 2011-11-09
GUIZHOU BRANCH CHINA ALUMINUM IND
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Because of the poor anti-disturbance performance of the inert anode, it is obvious that the inert electrode cannot be used to heat the electrolyte during the firing process.

Method used

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  • Preheating starting method for aluminium electrolysis cell
  • Preheating starting method for aluminium electrolysis cell
  • Preheating starting method for aluminium electrolysis cell

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0037]In traditional 300KA aluminum electrolytic cells, carbon anodes are used to make preheating electrodes. Drill a hole on the upper surface of the carbon anode (1) and put in the heating element (2). The anode does not need to be connected to the busbar with a soft connection. Fix the preheating electrode busbar (3) on the aluminum busbar with a clamp. The number of preheating electrodes is the same as The number of anodes is consistent during normal production. The furnace is filled with solid electrolyte, and cryolite and soda ash are added to the tank and anode to keep warm and prevent anodic oxidation. Turn on the heating element and start heating according to the temperature rise regime. When the furnace temperature is heated to 950°C, continue to add solid electrolyte until the electrolyte level is 25cm, add fluorine salt, adjust the electrolyte composition, adjust the heating component power to simulate the heat input in the electrolysis state, when the electrolyti...

Embodiment 2

[0039] The traditional 400KA aluminum electrolytic cell has a special-shaped cathode with a diversion structure. Drill a hole on the upper surface of the carbon anode (1) and put it into the heating assembly (2). The anode does not need to be connected to the busbar with a flexible connection. Fix the preheating electrode busbar (3) on the aluminum busbar with a clamp. The number of preheating electrodes is the same as The number of anodes is consistent during normal production. The furnace is filled with solid electrolyte, and the heating element is supplied with alternating current, and the heating starts according to the heating system. When the furnace temperature is heated to 960°C, add liquid electrolyte until the electrolyte level is 23cm, pour 10cm of aluminum water, add fluoride salt, adjust the electrolyte composition, adjust the heating component power to simulate the heat input in the electrolysis state, when the electrolytic cell reaches the expected heat balance ...

Embodiment 3

[0041] Vertical inert electrode aluminum electrolytic cell, "preheated anode" includes graphite electrode (4), heating component (5), corrosion-resistant material protective layer (6), plate busbar (7), guide rod (8). A hole is drilled on the upper surface of the graphite electrode (4), and the heating assembly (5) is put in; the heating assembly of the preheated electrode has a corrosion-resistant material protection layer (6) on the exposed graphite electrode part and the guide rod (4). The graphite electrode (4) is connected with the pole plate bus bar (7) through the guide rod (8). The "preheated cathode" is also made of graphite electrodes and has the same structure as the "preheated anode", but without drilling and without heating components. The preheated electrodes and preheated cathodes are fixed in the electrolytic cell in the form of "-yin-yang-yin-". There are 2 electrolytic cells in total, and each electrolytic cell contains 9 preheated anodes and 10 preheated cat...

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Abstract

The invention relates to a preheating starting method for an aluminium electrolysis cell, and the preheating starting method comprises the following preheating starting processes: (1) drilling on the upper surface of a carbon or graphite electrode, and pre-embedding a heating element in the electrode; (2) heating a hearth by using a heating assembly according to a roasting curve; (3) after reaching a target temperature, adding a solid or liquid electrolyte until reaching a required electrolyte level, regulating the power of the heating assembly, and primarily building heat balance and inner hearth mold required by the electrolysis cell; (4) introducing direct current for electrolyzing a preheating electrode; and (5) gradually utilizing an electrode which normally operates to replace the preheating electrode carrying the heating element. The method disclosed by the invention can evenly heat; in the preheating process, an anode and the bus do not need flexible connection; a traditional cell of which the cathode is in an abnormal-shape structure can be effectively preheated, and an inert electrode aluminium electrolysis cell can be effectively preheated and started; and a stable electrolysis environment is built, current efficiency is improved, and the service life of the electrode is prolonged. The preheating electrode can be reused to lower electrolysis cell starting cost.

Description

technical field [0001] The invention relates to a method for preheating and starting an aluminum electrolytic cell. Background technique [0002] Newly built or overhauled aluminum smelters go through roasting and start-up processes before they enter production. The firing start-up process of the traditional cell is mainly to use the heat-generating material placed between the cathode and anode of the aluminum electrolytic cell to generate heat to increase the temperature of the anode and cathode (including the lining) of the electrolytic cell. The aluminum liquid roasting method and the coke grain roasting method all have different degrees of damage to the cathode, and the roasting of the artificial leg is poor, which in turn has an adverse effect on the life of the tank. [0003] The start-up of the electrolytic cell is to make the electrolytic cell form the basic technical conditions required for the electrolytic reaction to occur when the electrolytic cell is connected ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C25C3/20
CPCC25C3/06C25C3/14C25C3/20
Inventor 杨建红唐新平曹鹏包生重
Owner GUIZHOU BRANCH CHINA ALUMINUM IND
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