SU857302A1 - Method of annealing fettlings of aluminium electrolyzer after overhauling - Google Patents

Description

the slope height of the peripheral ram seam (up to 70 mm), possible common slope of the bottom (up to 15 mm), which leads to an uneven distribution (ON the bottom surface and poor roasting c) the roasting is accompanied by large heat losses due to the surfaces of the side liner and anode are bare, the hearth is not sufficiently insulated with starting raw materials, so often, especially in winter, with a duration of over 60 hours, heat consumption exceeds the supply, which leads to cooling of the hearth and a decrease in its quality. The purpose of the invention is to improve the quality of the hearth after firing and to increase the efficiency of using electric power. The goal is achieved by the fact that after the overhaul, the firing of aluminum aluminum electrolysis vessels is carried out with a mine filled with start-up components at the next stage. Components Known, tons 1 5.65 0.635 Electrolyte 2-3 10 56.5 5.910 Metall4-5 89 503.85 10.400 Olrie3 -4 IIIIIIIIIIIIIIirilTIIIIIiriillirm%} mm 11 1 | 3 nd 8 1iI-ID t i loading rarity and their ratio in height of the mine,%: Electrolyte 1-5 Aluminum 10-15 Starting raw materials the rest Example. After the installation of the electrolyzer type S-8BM (mine depth 565 mm), denote A, or type C4 (mine depth: s 600 mm), we denote B, immediately after preheating the surface of the bottom flame is poured into the mine for 40-80 minutes the electrolyte in the amount specified in the tables for electrolyzers A and B. Atom, not allowing a break in pouring, pour aluminum. After that, the starting material is loaded before the mine is filled. In the tables for electrolyzers A and B, extreme (1 and 3) and optimal (2) ratios for guns of starting components along the height of the electrolyzer shaft A and B are provided. Table. 1 shows the ratio of the layers of starting components along the height of the shaft for the electrolyzer A; in table 2 the same, electrolyzer B. Table 1 Conditions Proposed bay 2.65 15 1.6585 5 28.25 1.955 Type C-computer 10.3 58 6.067 15 84.75 8.865 mm 87.449210.180 80 452 9.04 7.27 m

Electrolyte 2-31, 6 0.630 2.5 Metal4-5 10 60 5.862 11.0 Raw materials3-4 89 534 9.790 86.5

The minimum (1A and 1B) and maximum (ZA and ZB) height of the electrolyte layer is 1–5% of the charge height. It is constructive;

1,890 Type-C4 8,793

8,800 Ophier, 6.9 m

60 sot in the mine (up to 20 mm), possible total slope of the bottom (up to 15 mm}. At that, in the absence of those, the level of electrolyte is applied 1%, and at the maximum run-up height

65 blocks and bottom tilt - 5%. Zali15 1,575 5 30 55 6,448 15 90 519 9.50 80 480

The required and technologically necessary amount of electrolyte is mm or 0.6-1.9 tons.

The optimal amount of electrolyte poured in with rbji: ce corresponds to the values of examples 2A and 2B, i.e. 15 mm and 1.6-1.7 tons, which ensures the best heat distribution in the bottom and higher quality roasting.

The effective amount of metal to be drilled into the shaft is determined by the height of the slope of the peripheral ram seam, which practically reaches 60-100 "

The casting of aluminum in an amount that makes it possible to create a layer of 60100 mm ensures coking of the masses in the seam. At this extreme, the heights of the gshyumin layers during firing correspond to from 56 mm to 90 mm (examples 1A, 1B and 3, 3B). Most hoursHeat heat, kcal / h-10

Heat loss, kcal / h -10,

including the side surface of the lining and side surface. anode, kcal / h-10

Metal temperature, C As can be seen from the table. 3, the roasting of the bottom of the aluminum electrolysis cell after overhaul is more effective with the proposed method than with the known method, since the efficiency of heat utilization and the temperature of the bottom increase, which guarantees its improved quality. Applying roasting to the proposed method with an optimal ratio of components allows reducing heat losses by more than 2, 2.1 (2.1), use this amount of heat to warm up the bottom and starting materials (the temperature of the base became lower on average); reduce the duration of roasting for 12-24 h; to improve the quality of the hearth after firing, as evidenced by the absence of melt channels in the windows of the cathode shell on the firing and start-up of electrolyzers

This slope height of the peripheral weld above the bottom is 70 mm, which corresponds to the optimum height of the layer on the electrolyzer A — 58 mm; with the height of the electrolyte layer previously filled into the mine, 15 mm (Example 2A), or in the case of the roasting of the electrolyzer B, respectively m of metal and 15 mm of electrolyte (example 2B). The optimal weight quantity for example 2A and 2B is 6 O and 6.5 tons,

In contrast to the known method, when the shaft is filled only by 2530%, the firing according to the proposed method is carried out with a silk completely filled with the starting material,

Table 3 gives a comparison of pargillers of burning of electrolyzers, made according to the known and proposed (Method (according to examples 2A and 2B).

Table 3

327211205327211

51921204680

Claims (2)

51224560696754. 665780 and the improved grade of aluminum with respect to the content of silicon and iron impurities, h. The economic efficiency per ten electrolyzer was 36.7 thousand rubles. The invention of the method of burning the podia of an aluminum electrolyzer after ki1.1 repair, including preheating the bottom, pouring the metal electrolyte and loading the starting material, distinguishes with the fact that, in order to improve the quality of the bottom and increase the efficiency of electric power use, the compression is carried out in a mixture filled with electrolyte metal and raw materials, with the following on 8573028 load sequence and ratio-1. USSR author's certificate component of the height of the mine,%: № 130683, cl. C 25 C 3/06, 1959, Electrolyte 1-5. 2. Slavin V.V. and others. The method of aluminum. 10-15; hectares of aluminum electrolysis cells per meter. Starting raw materials Elastic with pre-casting Information sources,. electrolyte. - Tsvetna metallurgists, taken into account in the examination of 1977, 15, s, 29-31.