A bonding method for continuous prebaked anode carbon blocks

Abstract

The invention discloses a bonding method for continuous prebaked anode carbon blocks. Bonding is performed with the following method, when the use thickness of the anode carbon blocks on an electrolytic bath ranges from 250 mm to 300 mm, the old anode carbon blocks are obtained, the upper surfaces of the old anode carbon blocks are cooled firstly, then sinter-hardened pre-smeared foam mud on the upper surfaces of the old anode carbon blocks is roughened, then foam mud is smeared to the lower surfaces of new anode carbon blocks, the new anode carbon blocks and the old anode carbon blocks are stacked vertically and are bonded together through extruding. The method has the beneficial effects that the new and old carbon blocks are bonded firmly, the resistance between the new and old carbon blocks is small, the electrolysis energy consumption is reduced, anode scraps are eliminated, and convenient and safe connection is realized.

Description

technical field [0001] The invention relates to the field of production methods of prebaked anode carbon blocks for aluminum electrolytic cells, in particular to a bonding method for continuous prebaked anode carbon blocks. Background technique [0002] In the modern electrolytic aluminum industry, prebaked anodes are used to produce electrolytic aluminum. The usual prebaked anode carbon block is used intermittently, and the service life of an anode carbon block is about 30 days. The prebaked anode carbon block is gradually consumed during use. When the remaining height is 15-18cm, it must be taken out from the electrolytic cell and replaced with a new anode carbon block. The prebaked anode is generally a cuboid with a stable geometric shape. It uses stone tar and pitch coke as the aggregate and coal tar pitch as the binder. It has different sizes according to the size of the electrolytic cell current and the process. Its current density Generally at 0.68-0.9A / cm 2 within...

AI Technical Summary

Problems solved by technology

[0006] To sum up, the existing technology has the following technical defects: 1. Chinese patent 201710088066.4- discloses the method and structure of the online connection of the anode by the prebaked anode aluminum electrolysis. When the old anode carbon block is to be connected with the new anode carbon block, the temperature must reach About 750°C, and the temperature difference between the new anode carbon block and the normal temperature is more than 700°C. After the two are bonded, as the temperature of the new anode carbon block gradually rises to about 750°C, due to thermal expansion and contraction, the new anode carbon block Volume expansion, shearing at the bonding point, weak bonding, and excessive resistance between the new and old anode carbon blocks; 2. The bonding resistance between the prebaked anode carbon blocks is large, resulting in high cell voltage during the electrolysis process of the anode , which is not conducive to energy saving; 3. Due to the limitation of the existing production process of anode carbon blocks, the produced anode carbon blocks are warped and deformed, and the warping deformation of anode carbon blocks increases the difficulty of bonding continuous anode carbon blocks. When two carbon blocks are connected up and down, the unevenness of the warping and deformation of the carbon blocks will cause gaps at the joint, increase the resistance at the joint, and even cause technical problems that cannot be connected