SU767238A1 - Method of producing burnt anode for aluminium electrolyzer - Google Patents

Description

(54) METHOD OF MANUFACTURING ABOUT (ANNOUNCED BY ANOM FOR AN ALSHINIA ELECTROLISER

The invention relates to the field of metallurgy of non-ferrous metals, in particular to the production of aluminum by electrolytic melts, and can be used on aluminum and electrode S plants in the production of burned stones. .

i There is a method of producing anodone, which forms blocks. from the electrode mass on the vibropress-Yu. two plants with the last roasting, in the furnace C}. ,

The disadvantage of this method is the relatively high oxidability of the sides and especially the top-15 sides of the electrode unit located above the electrolyte surface.

A known method for the production of a sintered anode for an aluminum electrolyzer from carbonaceous matshov 20 with the addition of an inhibitor, including mixing carbon components of the anode mass, filling the mold, vibropressing and calcining. When mixing the composition of the electrode mass 25, boric acid is added at the rate of 0.2–2% of VLO 2.

The disadvantage of the β-method is that it only partially solves the problem of protecting the anodes from oxidation, since. thirty

the effect of the oxidation inhibitor depends on its concentration, the amount of which is limited. With an increase in the concentration of the inhibitor additive in the electrode mass, which is necessary for more effective protection against oxidation, the physical and mechanical properties of the anode (strength, electrical conductivity) deteriorate. This leads to a decrease in the technical and economic indicators of the process.

The purpose of the invention is to improve the technical and economic indicators of the electrolysis process.

The goal is achieved by the fact that the inhibitor is added to the surface of the anode mass before vibropressing.

In this case, an inhibitor of 0.030.07 g / cm of the mold area is added.

This method of producing prebaked anodes provides effective protection against oxidation of the upper part of the coal block with minimal costs of inhibitor additions and maintaining the high physicochemical properties of the electrode.

Claims (2)

The introduction of the additive s to the surface layer of the anode is carried out by applying it to the surface of the electrode mass loaded into the press-Form before vibropressing. During subsequent vibration of the mold, the additive is introduced into the surface layer to a depth of 15-20 mm due to the oscillatory movement of the particles of the mass. For reliable oxidation, the concentration of the additive in the surface layer should be about 1.0-2.5%. This requires the introduction of it in the amount of 0.03-0.07 g / s of the protected surface. Nafig 1 shows the electrode mass poured into the matrix; in Fig.2, the addition of the inhibitor is applied to the surface of the mass; in fig. 3 - cycle of vibropressing with the load ohm, in FIG. 4 a pressed anode, in the upper part of which an additive of the inhibitor was introduced. Cycle vibropressb ean yri introduction. . the additive is carried out as follows. An electrode mass 2 is poured into the matrix 1, and the addition of 3 inhibitors is applied to its surface. The matrix 1 with a mass of 2 and an additive of 3 when the submersible 4 is lowered is subjected to vibration during which the additive penetrates to a depth of 15-20 mm. At the time of pressing and pressing, load 4 is raised, and the pressed anode 5, the upper surface of which is protected by an inhibitor, is sent to pass through the next stages of the production process. Tl p and meer. The distribution of the additive p) dulled alumina (,,) deposited on the surface of the green mass in coal anode samples pressed by vibration using an amplitude of 1.2 r / sM, a frequency of 40 Hz, temperature: and pressure of the load about 0.6 kg / cm. From the top of the image-. 10 layers of material with a thickness of 2 mm each were removed, each of which the content of the additive was determined (in% by analysis of samples by incineration, ash content. The results of the analysis are given in that blitz. The ash content of the control samples (without the addition of the additive) 0.25%. Continuation of the table From the table it can be seen that the average content of the introduced additive (1,390, 25) is 1.1 and (2.19-0.25) 1.9 is close to the expected values of 1 and 2.5%, calculated from conditions of uniform distribution of the deposited surface of the bulk of the alumina in the layer thickness of 20 mm. Use offer This method of producing prebaked anodes with additives of inhibitors provides the following advantages: the consumption of the additive is reduced while increasing the efficiency of its action due to keeping it in the required zone and increasing the concentration of kg: per ton of metal produced), the possibility of electrolyte access decreases; to steel the current leads of the anode, their dissolution in the melt and the ingress of iron impurities in the ashyumny, improve (working conditions and stabilize the technological process due to an increase in the mechanical strength of the tip while reducing its burnout.:.;...; reducing the consumption of raw materials per o (anode of anodes, the economic effect will be approximately 0, 4-0, 7 rubles per 1 ton of product. Claims of the invention; 1. A method for producing a baked anode for an aluminum electrolyzer from carbonaceous materials; fishing with inhibitor, which includes mixing carbonaceous components of the anidic mass, filling the mold, vibropressing and burning, is different from that with the aim of increasing the technical and economic indicators of the electrolyser process, the inhibitor is added to the surface of the anode mass before vibropressing-. 2. The method according to claim 1, wherein the inhibitor adds 0.03-0.07 g / cm of the area of the mold. Sources of information taken into account in the examination 1. Modern equipment used for the production of baked anodes abroad, M.,. TSIINTSVETM: ЕТ, 19bЗ. 2, US Patent No. 3284373, CL.252-506, 1966. . 9ut.3 S9il.