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Charging method for pre-baking aluminum electrolytic tank

An aluminum electrolytic cell and furnace loading technology, which is applied in the field of furnace loading when the electrolytic cell is started, can solve the problems of long recovery period, fusion, and increase the start-up cost of the electrolytic cell, and achieve the effect of shortening the recovery period and saving material costs

Inactive Publication Date: 2009-11-18
GUIZHOU BRANCH CHINA ALUMINUM IND
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] Because of this kind of furnace loading process ④, the gap between the anode and the middle gap is sealed with steel plates, asbestos boards, calcium silicate boards and other materials, which will inevitably melt into the molten aluminum after the tank is started, so that the grade of primary aluminum in the newly started electrolytic cell is generally 99.00%, and contains high content of silicon, iron and other impurities. These impurities make the recovery period longer, usually about 25-30 days, which increases the start-up cost of the electrolytic cell and affects the economic benefits of production

Method used

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  • Charging method for pre-baking aluminum electrolytic tank
  • Charging method for pre-baking aluminum electrolytic tank

Examples

Experimental program
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Effect test

Embodiment 1

[0021] Furnace loading process before wet start-up of 160KA electrolyzer after overhaul

[0022] First, weigh 450 kg of calcined petroleum coke grains and pour them on the coke grain bed, divide them into three grades of 0.5 mm, 1.2 mm and 2.3 mm according to the particle size, preheat to 220°C, and then adjust the weight ratio to 50:27:23 The ratio is uniformly mixed, so that the calcined petroleum coke particles are evenly laid on the graphite cathode. Install the anode to ensure that the bottom palm of the anode is in full contact with the coke particles. Lay 0.6t of calcium fluoride on the side artificial legs. Electrolyte blocks with a molecular ratio of 2.6 are used for the gaps and middle gaps between the anodes. Electrolyte blocks with a particle size of 40-45 mm and 220-250 mm are selected as coverings according to the gap width, and then newspapers are used to cover the electrolyte blocks; The mixture of cryolite and soda ash with a ratio of 0.8:1 is 3 tons. The a...

Embodiment 2

[0025] Furnace loading process before wet start-up of 150KA electrolyzer after overhaul.

[0026] First weigh 420-430 kg of calcined petroleum coke particles and pour them on the sieve plate, divide them into three grades of 0.5 mm, 2 mm and 3 mm according to the particle size, preheat to 250 °C, and then adjust the weight ratio to 50:27 The ratio of : 23 is evenly mixed, so that the calcined petroleum coke particles are evenly laid on the graphite cathode. Install the anode to ensure that the bottom palm of the anode is in full contact with the coke particles. Lay 0.6 tons of calcium fluoride on the side artificial leg. Electrolyte blocks with a molecular ratio of 2.8 are used for the gaps and middle gaps in the anode, and electrolyte blocks with a particle size of 45-50 mm and 225-270 mm are selected as sealants according to the gap width, and then newspapers are used to cover the electrolyte block; 2.8 cryolite covering, sealing thickness 20cm. The quality of primary alu...

Embodiment 3

[0029] Furnace loading process before wet start-up of 300KA electrolyzer after overhaul.

[0030] First, weigh 700 kg of calcined petroleum coke particles and pour them on the sieve plate, divide them into three grades of 1 mm, 2 mm and 4 mm according to the particle size, preheat to 250 °C, and then adjust the weight ratio to 50:27:23 The ratio is uniformly mixed, so that the calcined petroleum coke particles are evenly laid on the graphite cathode. Install the anode to ensure that the bottom palm of the anode is in full contact with the coke particles. Lay 1.2 tons of calcium fluoride on the side artificial legs. Electrolyte blocks with a molecular ratio of 3.0 are used for the gaps and middle gaps between the anodes. Electrolyte blocks with a particle size of 50-70 mm and 280-300 mm are selected as sealants according to the gap width, and then newspapers are used to cover the electrolyte blocks; 3.0 cryolite covering, sealing thickness 18cm. The quality of primary alumin...

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Abstract

A charging method for a pre-baking aluminum electrolytic tank relates to a charging method when the electrolytic tank is started during aluminum electrolyzing process. The invention is characterized in that the furnace charging process comprises the following steps: (1) filtering purely calcined petrol coke particles and laying the particles on a graphite cathode; (2) installing an anode; (3) laying calcium fluoride on the edge artificial extension leg; (4) selecting an electrolyte block as a sealing object for sealing the break joint and centre joint of the anode and covering a paper sheet on the electrolyte block; and (5) covering the anode by an ice stone with a thickness of 10-25 cm. No impurity is brought into the electrolyte system in the method of the invention, in particular the electrolyte block and the paper sheet are used as sealing materials for sealing break joint and centre joint of the anode, and the electrolyte block without impurities and newspaper are used in place of steel plate, asbestos board and calcium silicate board during charging process. Therefore, the method rapidly recovers the primary aluminum mass of a newly started electrolytic tank, greatly shortens the recovery period of the primary aluminum mass, reduces the start cost of the electrolytic tank and achieves remarkable economical benefit.

Description

technical field [0001] The invention relates to a furnace charging method for a prebaked aluminum electrolytic cell, and relates to a furnace charging method for starting an electrolytic cell in an aluminum electrolysis process. Background technique [0002] The start-up of the electrolytic cell is divided into dry start-up and wet start-up. It is an essential process of electrolytic production. The quality of start-up directly affects the stable production of the electrolytic cell, the quality of primary aluminum and the life of the electrolytic cell. Furnace loading before start-up is one of the key operations to achieve a uniform rise in the roasting temperature of the electrolytic cell. At present, the start-up of the electrolytic cell after overhaul mainly adopts a wet start-up scheme. The furnace charging process before start-up is as follows: [0003] ①Classify, screen and preheat the pure calcined petroleum coke particles, and then mix evenly according to the proport...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C25C3/06
Inventor 曹永峰史志荣胡清韬
Owner GUIZHOU BRANCH CHINA ALUMINUM IND
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