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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 heating electrolyte and poor anti-disturbance performance of inert anodes, and achieve uniform heating, reduce startup costs, and improve current efficiency.

Active Publication Date: 2013-02-13
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

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0037] The traditional 300KA aluminum electrolytic cell uses carbon anodes 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 equal to The number of anodes is the same during normal production. The furnace is filled with solid electrolyte, and cryolite and soda ash are added to the tank and the anode to keep warm and avoid anodic oxidation. Communicate with the heating components and start heating according to the heating system. When the furnace temperature is heated to 950℃, continue to add solid electrolyte until the electrolyte level is 25cm, add fluoride salt, adjust the electrolyte composition, adjust the heating component power to simulate the heat input in the electrolysis state, when the electrolyzer reac...

Embodiment 2

[0039] The traditional 400KA aluminum electrolytic cell has a special-shaped cathode with a flow guiding structure. Drill a hole on the upper surface of the carbon anode (1) and put in the heating assembly (2). The anode does not need to be connected to the bus bar with a soft connection. Fix the preheating electrode bus bar (3) on the aluminum bus bar with a clamp. The number of preheating electrodes is equal to The number of anodes is the same during normal production. The furnace chamber is filled with solid electrolyte, the heating component is energized, and heating starts according to the heating system. When the furnace temperature is heated to 960℃, add liquid electrolyte until the electrolyte level is 23cm, pour aluminum water 10cm, add fluoride salt, adjust the electrolyte composition, adjust the heating component power to simulate the heat input in the electrolysis state, and when the electrolytic cell reaches the expected heat balance In the state and the furnace i...

Embodiment 3

[0041] Vertical inert electrode aluminum electrolytic cell, "preheating anode" includes graphite electrode (4), heating element (5), corrosion-resistant material protective layer (6), plate bus (7), guide rod (8). Drill a hole on the upper surface of the graphite electrode (4), and insert the heating component (5); the preheating electrode heating component has a corrosion-resistant material protective layer (6) at the exposed graphite electrode part and the guide rod (4). The graphite electrode (4) is connected with the electrode plate bus (7) through the guide rod (8). The "preheating cathode" is also made of graphite electrodes, the structure is the same as the "preheating anode", but without drilling holes and no heating components. The preheating electrode and the preheating cathode are fixed in the electrolytic cell in the way of "-yin-yang-yin-". There are 2 electrolytic cells, and each electrolytic cell contains 9 preheated anodes and 10 preheated cathodes. The preheat...

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Abstract

A preheating start method of an aluminum electrolysis cell is provided, which comprises: drilling on the upper surface of the carbon or graphite electrodes and pre-embedding the heating element in the electrode; heating the hearth of the cell according to a roasting curve by using a heating assembly; after arriving at a target temperature, adding solid or liquid electrolyte to a required electrolyte level, then regulating the power of the heating assembly, and primarily establishing heat balance and inner hearth mold required by the electrolysis cell; introducing direct current to preheat electrodes and electrolyzing the electrolyte; gradually replacing the preheating electrodes which carries the heating elements with the electrodes which are normally operating. The method in this invention provides uniform heating, and does not need flexible connection between anodes and bus bars during the preheating process, therefore it can be used to preheat traditional cell having a cathode with an abnormal-shape structure effectively, and also can be used to preheat and start an inert electrode aluminum electrolysis cell effectively, building a stable electrolysis environment, improving current efficiency, and prolonging the service life of the electrode. The preheating electrode can be reused so as to lower the cost of starting the electrolysis cell.

Description

Technical field [0001] The invention relates to a preheating start method of an aluminum electrolytic cell. Background technique [0002] The newly-built or overhauled aluminum electrolytic cell must undergo a roasting and start-up process before it enters production. The firing start-up process of the traditional cell mainly uses the heating material placed between the anode and the anode of the aluminum electrolytic cell to generate heat, which increases the temperature of the anode and cathode (including the lining) of the electrolytic cell. The liquid aluminum roasting method and the coke grain roasting method have different degrees of damage to the cathode, and the roasting of the artificial leg is poor, which will adversely affect the life of the tank. [0003] The start of the electrolysis cell means that the electrolysis cell is connected to a series of currents to form the basic technical conditions required for the electrolysis reaction, and the main technical parameters...

Claims

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Application Information

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