SU1054450A1 - Material for lining electrolytic cell pedestal - Google Patents

Abstract

MATERIAL FOR LAMINATION OF ELECTROLYZER DOCTOR, containing alumina, carbonaceous filler and plasticizer, characterized in that, in order to reduce the cost of mounting the electrolyzer base and to increase the service life of the electrolyzer, it additionally contains magnesium oxide and sawdust as carbonaceous paplice-ground coke, as plasticizer. - water with the following ratio of components, wt.%: the following ratio of components, May.%: Alumina 40-75 Magnesium oxide 4-20 crushed coke 2-8. Sawdust 1-4 i WaterOther (L

Description

ate 4; The invention relates to metallurgy and can be attached to the lining of aluminum electrolysis cells. Known material for lining the base of the electrolyzer from. cryolite-linoleum melt .L.Q However, this material does not exclude the production of alumina when it is loaded into the casing. In addition, the cryolite – alumina base has increased brittleness and BbfcoKoft thermal conductivity, which negatively affects the strength of the cathode and leads to significant heat loss, and the cost of the cryolite itself and energy costs are high. the replica leads to the fact that the cost of such a base is more than 2 p for higher brick. The closest to the technical essence and the achieved result to the proposed material is the material for lining the base of the electrolyzer. containing plasticizer, cryolite, alumina and carbonaceous aggregate. As a plasticizer, it contains coal tar pitch G27 - e. The disadvantages of this material are the high cost of installing the electrolyzer ring and the short lifetime of the material. The purpose of the invention is to reduce the cost of installing the electrolysis cell base and swelling. service life of the cell. This goal is achieved by the fact that the lining material, the cell base of the electrolyzer containing clay, carbon filler and plasticizer, additionally contains magnesium oxide and sawdust, crushed coke as carbon filler, and water as the plasticizer in the following component, wt. .%: Alumina 40-75:. Magnesium oxide, 4-20 Coke minced. 2-8 Sawdust 1-4 Water Elsement The lining of the basement is carried out as follows. Before filling alumina on days, even the cathode shell is introduced into it into solid additives and substances that contribute to a decrease in the thermal conductivity of the Material {for example, crushed coke or sawdust). The dry mixture is carefully averaged, then a liquid plasticizer is added, after which the material is compacted by mechanical methods and subjected to a short-term thermal effect. Adhesive additives promote sticking of particles and strengthening of the material, eliminate settling of the fluid & - separate zones, and substances with a coefficient. The heat conduction volume is lower than that of alumina, when heated, it is ignited, forming porosity in the material. Liquid plasticizer reduces the coefficient of friction between the particles, increases the plasticity of the material, and also contributes to filling the porous space in the material with small plaintiffs. As a result of this, dusting of the material is eliminated and its compaction property and strength are improved. Material compaction eliminates subsidence of the plinth after the installation of the bottom blocks. Thermal exposure significantly reduces the moisture content in the base, as its presence, especially in the upper layers of the base, is undesirable and can lead to cracking of the bottom during the operation of the electrolyzer. Thermal treatment also contributes to the strength characteristics of the base,. In order to clarify the composition of the material and substantiate the concentration limits of the components included in the composition of the material proposed, the properties of the material proposed were tested. The prepared material proposed with a “Ш5” material is made into metal molds 4x4x4 cm in size; it is compacted with a tamper with a force of 3-5 kg / cm and subjected to heat treatment in a heating furnace at 800 ° C for 1 hour. solubility in electrolite, residual moisture Calculate the coefficient of thermal conductivity and the cost of a cubic meter of material The data are summarized in table 1, which shows that the cost of 1 m base of the proposed material is 2.5 times lower than that of the cryolite-alumina material. The proposed material has high strength.

low solubility in electro and residual moisture.

According to the results of the tests, the following composition of the rial for lining was adopted, May, It

Alumina

40-75 Magnesium oxide 4-20 Coke minced

2-8

Sawdust 1-4 Water Rest

The best properties for the length of the lining of the base has a material composition a, May. %:

Alumina60

Magnesia 11

0544504

   Coke crushed4 Sawdust 2 Veda23 5 As a part of the material, alumina is a filler, magnesium oxide and coke contribute to increasing the strength in the heat treatment process. In addition, the addition of coke reduces the rate of dissolution of the material. electrolyte, sawdust reduces the thermal conductivity of the material, water is a plasticizer, it contributes to the compaction of the material, ustts. Material dusting occurs when mounting the base.

In tab. 2 shows the properties of the proposed material. Table 1

Strength. After compaction and heat treatment, kg / cm

Calculated coefficient of thermal conductivity in t / m hail, at 60055, 155.0 45; b

55.3

Claims (1)

MATERIAL FOR LAYING THE ELECTROLYZER SOCKET, containing alumina, carbon filler and plasticizer, characterized in that, in order to reduce the cost of installing the electrolytic base and increase the life of the electrolyzer, it additionally contains magnesium oxide and wood sawdust, as a carbon chap-shredded coke, and as a plasticizer, water in the following ratio of components, wt.%: the following ratio of components, May.%: - •Alumina 40-75 ’ Magnesium oxide 4-20 Ground coke 2-8. Sawdust 1-4 Q Water Rest S8