Aluminum tank bottom preheating method

Abstract

The method includes: covering the can bottom with a conductive material; a pre-baked anode is placed on the pre-baked anode; the anode bus is connected with the anode bus of the tank anode bus; current passes through the conductive material; and controlling a current load on the anode for preheating. Uniform preheating is ensured by correctly selecting the number of conductive materials below the anode. That is, by selecting the amount of conductive material under the anodes, the amount of material under the anodes in the middle of the tank is less than the amount of material under the anodes near the end-most anodes, and the amount of material under the anodes near the end-most anodes is less than the amount of material under the end-most anodes. By means of the method, it is guaranteed that the bottom of the aluminum pot is evenly heated in the whole preheating process, safe starting of the pot is guaranteed, and the service life of the aluminum pot is prolonged.

Description

technical field [0001] The invention relates to the field of nonferrous metal metallurgy, in particular to the electrolytic reduction of aluminum, that is, the method for preheating the bottom of an aluminum can with a prebaked or inert anode. Background technique [0002] Some processes used in the aluminum industry require large amounts of thermal energy to preheat equipment before it is started up. In the past, the lining warm-up process of equipment was often neglected, resulting in, for example, cold start-up and shortened life of tanks. Before starting a tank, its cathode lining should be thoroughly and evenly preheated to minimize potential damage from excessive temperature differentials. [0003] High temperature differentials while pouring the bath into the tank and use of coarse primer paste can cause thermal shock, cathode block cracking, leakage and ultimately shortened tank life. [0004] There are two basic methods of tank bottom preheating: [0005] Electri...

AI Technical Summary

Problems solved by technology

[0014] A disadvantage of this method of preheating the bottom of aluminum cans is that the graphite material is filled as rows under the projection of short rods over the entire length of all prebaked anode blocks

This filling method of graphite material cannot heat the bottom of the tank evenly in the first half of the preheating process, because if the graphite material under the anode has the same cross-section, the current will flow to the middle of the tank during heating

Therefore, the bottom of the tank will be heated more slowly, which will lead to significant temperature gradients

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