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Method for paving roasting medium in aluminum electrolysis cell and method for roasting lining

An aluminum electrolytic cell and roasting technology, which is applied in the field of metallurgy, can solve problems such as uneven distribution of anode current, uneven distribution of coke particles, and depolarization, so as to achieve simple work of laying roasting media, solve uneven temperature, and prevent insufficient contact Effect

Active Publication Date: 2013-03-27
YUNNAN YONGXIN ALUMINUM +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] In the prior art, the main disadvantages of the coke granule roasting method are that the coke granule usage is too large, the production cost is high, the coke granule distribution is uneven, the thickness of the coke granule layer is inconsistent, the cathode surface temperature is uneven, the anode current distribution is uneven, and it is easy to produce issues such as depolarization
In addition, a large amount of CO is produced during the roasting start-up process 2 、CF 4 and other harmful gases, polluting the natural environment
[0004] Therefore, the current method of laying the firing medium and firing the inner lining of the aluminum electrolytic cell still needs to be improved.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0037] 1) Ratio roasting medium

[0038] The calcined coke particles are selected as the roasting medium, and graphite powder is added at the same time. The particle size of the coke particles is 2-4 mm, and the particle size of the graphite powder is 1-3 mm. The mass ratio of the two is 8:2, and the mixture is uniform;

[0039] 2) Transport the roasting medium and anode to the empty space in front of the tank and place it, which is cheap to install the tank;

[0040] 3) Before laying, the cathode should be cleaned first. The size of the fence frame is 1700mm×45mm×25mm. Place it flat on the positive projection area of ​​the anode, and then fill the fence frame with firing medium, and scrape the surface with a scraper to ensure the surface of the firing medium There are no recesses, then carefully remove the grid frame, and finally clean the excess firing medium around the grid frame.

Embodiment 2

[0041] Example 2 Roasted aluminum electrolytic cell liner

[0042] Raw materials: (1) Materials for opening tank: low molecular ratio cryolite about 1300Kg, high molecular ratio cryolite about 17000Kg, CaF21000-1200Kg, electrolyte powder 4500Kg, caustic soda 2200Kg, coke powder 700-800Kg;

[0043] (2) Domestic common standard: 200KA coke powder 700~800Kg, 300KA coke powder 1000~1200Kg;

[0044] (3) Electrolyte: mixed system of cryolite, F: 54%-55%, Na: 20%-30%, Al: 10%-15%, Ca: 3%-4%.

[0045] Equipment: Electrolyzer, model 420KA, manufactured by China Nonferrous Metals Industry No. 7 Metallurgical Construction Company.

[0046] Process parameters: The current intensity is 420KA, the average temperature rise rate is 13°C / h, and the electrolytic cell is energized for 72-96 hours to meet the start-up conditions. At this time, the electrolysis temperature rises from 20°C to 960°C, and the electrolyte level is 15-20cm.

[0047] Follow the steps below:

[0048] 1) Current distri...

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PUM

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Abstract

The invention discloses a method for paving a roasting medium in an aluminum electrolysis cell and a method for roasting a lining of the aluminum electrolysis cell. The method for paving a roasting medium in an aluminum electrolysis cell comprises the following steps of: placing a fence frame in an anode orthographic projection area of the aluminum electrolysis cell; filling the fence frame with a roasting medium, wherein the roasting medium contains scorched particles and graphite; and after leveling the surface of the roasting medium, removing the fence frame. Through the invention, the roasting medium can be effectively paved in the aluminum electrolysis cell.

Description

technical field [0001] The invention relates to the field of metallurgy. Specifically, the invention relates to a method for laying a firing medium in an aluminum electrolytic cell and a method for firing an inner lining of an aluminum electrolytic cell. Background technique [0002] The roasting methods of aluminum electrolytic cells mainly include aluminum liquid roasting, coke grain roasting, gas roasting and direct heating roasting of metal resistors. Among them, the most commonly used is charred grain roasting. The method uses the calcined coke grains and graphite powder mixture as the connection medium between the anode and cathode of the aluminum electrolytic cell, and uses the heat generated after electrification to heat the inner lining for calcination. [0003] In the prior art, the main disadvantages of the coke granule roasting method are that the coke granule usage is too large, the production cost is high, the coke granule distribution is uneven, the thicknes...

Claims

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Application Information

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IPC IPC(8): C25C3/08
Inventor 杨叶伟车立志熊自勇赵瑞敏龙昌红杨国荣张平均普光平信伟松李顺华
Owner YUNNAN YONGXIN ALUMINUM
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