Electrolysis bath circumference paste material and preparation method thereof

Abstract

The invention relates to a paste material of electrolysis bath periphery and a process for preparation, belonging to the technical field of chemical industry. The technical problem that the invention needs to resolve is to provide a paste material of electrolysis bath periphery which has low cost and can replace the paste material in the prior art. The essential point of the technical scheme is that the paste material of electrolysis bath periphery is prepared by the following weight percentage materials: waste negative pole lining material 30%-55%; anthracite coal after calcinations 30%-50%; asphalt 7%-17% and coal-tar oil 3%-13%. The paste material of electrolysis bath periphery of the invention recycles the waste negative pole lining material, which greatly decreases the influence of the waste negative pole lining material on environment, simultaneously reduces the volume of use of coal, has remarkable effect of energy saving and discharge decreasing and has extremely fine application prospect.

Description

technical field [0001] The invention relates to the field of chemical industry, in particular to a paste around an electrolytic cell and a preparation method thereof. Background technique [0002] The surrounding paste (surrounding paste) is the main carbon paste required for the overhaul of the electrolytic cell. The life of the electrolytic cell is generally about 5 years. It will be completely replaced when the electrolytic cell is overhauled. During the operation of the electrolytic cell, if If the carbon block on the side of the electrolytic cell is partially damaged, the surrounding paste can be used to repair it, and the dosage is relatively large. [0003] At present, the main components of the surrounding paste used for electrolytic cell furnace construction are generally calcined anthracite, and then graphite powder, pitch, coal tar, etc. are added. Coal is a non-renewable resource. At present, the price of high-quality anthracite is relatively high, and coal must...

AI Technical Summary

Problems solved by technology

Coal is a non-renewable resource. At present, the price of high-quality anthracite is relatively high, and coal must be calcined at high temperature before it can be used to make surrounding paste. Generally, the calcining temperature is above 1200°C, which requires a large amount of energy consumption. In addition, the current The paste needs to add a certain amount of high-priced graphite powder, so the production cost of the surrounding paste is relatively high, and it has a great impact on the environment

[0004] While the overhaul of the electrolyzer will also produce a large amount of waste cathode lining materials, the content of harmful substances such as fluorine in this material is large, which will cause certain pollution to the surrounding environment. At present, there is no effective means to clean the waste cathode lining materials. Most of the major electrolytic aluminum plants need to build special anti-seepage slag yards to stack these waste materials