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Method for baking scorched particles in aluminum electrolytic cell

An aluminum electrolytic cell and coke particle technology, which is applied to the roasting field of non-ferrous metallurgy aluminum electrolytic cells, can solve the problems of not improving the anode conductivity at the corner of the electrolytic cell, and the roasting effect is difficult to guarantee, and achieves uniform roasting temperature distribution and electrolysis. The effect of suitable resistivity and uniform temperature rise between the cell and electrode

Inactive Publication Date: 2007-12-26
SHANDONG NANSHAN ALUMINUM
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

According to the blending ratio used in ZL02133898.1, it will not improve the conductivity of the anode at the corner of the electrolytic cell, and the temperature in the corner area will be significantly lower than the temperature at the edge of the electrolytic cell, making it difficult to guarantee the roasting effect

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0013] Example 1: A 300KA electrolysis series, with a total of 20 sets of double anodes, 4 sets of calcined coke materials evenly blended with 30% graphite crushed 25mm thick are laid at the corners, and 20mm thick calcined coke is laid under the non-corner anodes, which only contains calcined coke. After coke and graphite crushing require a particle size of 2~4mm to reach more than 80%. The steel strips are divided into 4 steel strips for each group of anodes.

[0014] Lay a grid screen slightly larger than the anode size in the furnace, and align it with the positive projection position of the anode, put the fully mixed mixture into the grid screen, and scrape it flat with a scraper. After laying one by one, lift Grid sieve, then accurately, stably, and lightly drop the anode block on the mixed material layer, so that the anode is completely in contact with the mixed material by its own weight, and then energized and started according to the conventional method.

Embodiment 2

[0015] Example 2: A 320KA electrolytic series, with a total of 40 sets of anodes, 4 sets of anodes at the corners are evenly mixed with 45% graphite powder, the rest are calcined coke, the thickness of the coke layer is 20mm, one set of anode steel belt shunts at the corners, and the rest There are two groups of anode steel belt shunts, laying and blending 10% graphite crushed calcined coke with a thickness of 20mm under the non-corner anode, and the calcined coke and graphite crushed require a particle size of 2~4mm to reach more than 80%.

Embodiment 3

[0016] Example 3: A 300KA electrolysis series, with a total of 20 sets of double anodes, 4 sets of calcined coke materials evenly mixed with 40% crushed graphite are laid at the corners with a thickness of 25 mm, and calcined coke mixed with 15% crushed graphite is laid under the rest of the non-corner anodes. The back coke is 20mm thick, and the calcined coke and graphite crushing require a particle size of 2~4mm to reach more than 80%. The steel strips are divided into 4 steel strips for each group of anodes.

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Abstract

This invention relates to a method for torrefying coke granules in aluminum electrolytic cell. The content of graphite granules in the mixed materials paved under the corner anode is 15-40 wt.% higher than that of graphite granules or graphited coke in the mixed materials paved under the non-corner anode. The mixed materials paved under the non-corner anode include: graphite granules or graphited coke 0-20 wt.%, and calcined coke 80-100 wt.%. The mixed materials paved under the corner anode include: graphite granules or graphited coke 15-60 wt.%, and calcined coke 45-80 wt.%. The method has uniform distribution of calcining temperature, and the temperature in the electrolytic cell is uniformly and stably increased. The method has such advantages as low cost, little graphite dust generation at start, appropriate resistance between electrodes, and high torrefaction performance.

Description

1. Technical field [0001] The invention relates to a method for roasting coke particles of an aluminum electrolytic cell, which belongs to the technical field of nonferrous metallurgy aluminum electrolytic cell roasting. 2. Technical background [0002] When the aluminum electrolytic cell adopts the charred particle roasting method, the temperature of the corresponding area rises slowly due to the large heat dissipation area of ​​the four corners of the electrolytic cell. Especially when the non-corner area of ​​the electrolytic cell produces liquid electrolyte, the corners of the electrolytic cell and The temperature difference in the non-corner area is more obvious. [0003] In order to eliminate this phenomenon, it is generally solved by keeping the anode current at the corners slightly higher than that at the non-corners at the initial stage of firing. Usually, the corner anode current is increased by reducing or canceling the number of corner anode shunt strips. [00...

Claims

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Application Information

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IPC IPC(8): C25C3/06
Inventor 刘海石宋昌明王建军
Owner SHANDONG NANSHAN ALUMINUM
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