RU1790631C - Method of compacting coal mass in seams of aluminium cell bottom - Google Patents

Abstract

Usage: compaction of coal mass in the seams of the bottom of aluminum electrolytic cells during their manufacture or overhaul. SUBSTANCE: coal mass is filled to a height of 100-200 mm and compacted by vibration of the working tool at an oscillation frequency in the range of 2000-9000 col / s with a specific pressure of at least 1.2 kgf / cm. This leads to improved weld quality and process efficiency.

Description

The invention relates to non-ferrous metallurgy, in particular to the manufacture and overhaul of the bottom of an aluminum electrolyzer.

The purpose of the invention is to improve the quality of the seam by ensuring its required density and reducing labor costs.

According to the proposed method, the coal mass is poured to a height in the range of 100-200 mm, and its compaction is carried out by vibration of the working tool at a frequency of 2000-9000 col / s with a specific pressure of at least 1.2 kgf / cm.

The selected intervals of the oscillation frequency of the working tool are limited in that when the tool oscillates with a high frequency, the coal mass, like other media, acquires greater mobility due to a decrease in the effective coefficient of internal friction of the medium, which means that the resistance forces of the medium are reduced. The fluidity properties acquired by the coal mass allow it to fill not only the structural elements of the hearth blocks — the castle grooves, but also the pairs, recesses, and cracks of the blocks, ensuring a uniform weld density on the entire hearth when using the same grade of mass.

The experiments carried out confirmed the accepted compaction modes and set parameters ensuring the achievement of the set goal.

PRI me R 1. Investigated a sample of cold-stuffed coal mass, compacted in a known manner. The coal mass (TU 48-4814-53-87) was poured into the seam 42 mm wide with a layer of 60 mm and compacted with a working tool 40 m wide with a shock frequency of 30-34 beats / s. The load lasts 10 s. The process was then repeated to a sample height of 400 mm, i.e. to the height of the hearth block.

Testing the sample showed an average density of 1.6 g / cm, and along the boundaries of successively compacted layers at (L

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their separation is observed. The number of backfillings, and consequently the seals, until the seam is completely filled in height (400 mm) 12.

Example 2. Investigated a sample of cold-stuffed coal mass, compacted by the proposed method. The coal mass was poured into the seam 42 mm wide with a layer of 100 mm (optimal filling height) and its compaction was performed with vibration of the working tool with a frequency of 2000-9000 count / s with a working tool width of 40 mm and a specific pressure of 1.2-1.8 kgf / cm2. Vibrate for 10 s. The process was then repeated until a sample height of 400 mm. Testing of the sample showed: the average density of the sample is 1.61-1.63 g / cm3 (depending on the parameters of the vibrator), the maximum attainable density is 1.8 g / cm. No separation of the compacted layers was observed along the boundaries of the backfill. The number of fillings and seals until the seam is completely filled in height 8.

Sample Investigated a sample of cold-stuffed coal mass, compacted by the proposed method. The coal mass was poured into the seam 42 mm wide with a layer of 100 mm and compacted using a vibration of the working tool with a frequency of 2000-9000 count / s with a tool width of 25 mm and a specific pressure of 1.2-1.8 kgf / cm2. The load lasts 10 s. The process was then repeated until a sample height of 400 mm. Testing the sample showed: average density of the sample 1.62-1.63 g / cm. The maximum attainable density is 1.8 g / cm. Along the borders

backfill there is no separation of the sealed layers. The number of fillings and seals until the seam is completely filled in height 8.

Further experiments were carried out under the conditions of example 3, only the height of the backfill increased by 10 mm with each experiment, i.e. 110, 120 mm, etc. up to a height of one filling of 220 mm, followed by compaction and filling of the seam with coal mass until the full height of the seam is filled. The results of compaction over time and density remained unchanged until the experiment, where the filling height was 150 mm. AT

in the range of the backfill value of 150-200 mm, an instability of the readings in density was observed with a tendency to decrease to 1.52-1.55 g / cm3, and over 200 mm there was a noticeable decrease in density to 1.5

g / cm3.

All experiments were carried out with a hand tool at a specific pressure on the tool of 1.2-1.8 kgf / cm2 (the upper limit is limited by the possibilities of creating

effort by a person) and when mechanically creating a force, for example, by a pneumatic drive, it can be large. The method of compacting the coal mass in the seams of the bottom of the aluminum electrolyzer allows to improve the quality of the seams with a uniform density along the height of the seam, reduce the complexity by increasing the height of the sealed layer and reducing the number of backfill, reduce the range of working

tool, increase the service life of the electrolyzer.

Claims (1)

SUMMARY OF THE INVENTION A method of compacting coal mass in the seams of the bottom of an aluminum electrolyzer, including filling the coal mass in the seams and sealing it with a working tool, characterized in that, in order to improve the quality of the seam by ensuring it the required density and reduce labor costs, filling the coal mass is carried out to a height of 100-200 mm, and compaction is carried out by vibration of the working tool at a frequency of 2000-9000 vibrations / s with a specific pressure of at least 1.2 kgf / cm2.