Technical method for electrolytic aluminium under 3.5 V cell voltage

Abstract

The invention provides a technical method for electrolytic aluminium under 3.5 V cell voltage, comprising the following steps: 1) installing at least one raised cathode of a cathode raised beam at the bottom of an electrolytic cell, wherein the width of the cathode raised beam is 15-25cm, and the height of the cathode raised beam is 10-15cm; 2) installing an anode with 8-13 air holes on the upper part of the electrolytic cell, wherein the air holes are arranged along the vertical direction and are tapered holes with bigger upper parts and smaller lower parts; 3) injecting molten electrolytes with the temperature of 950 DEG C in the electrolytic cell, and enabling the cathode and the anode to contact with the electrolyte solution; 4) dissolving sold alumina in the molten electrolytes, and introducing direct current from the anode; and 5) pumping the aluminum solution out of the electrolytic cell via a vacuum ladle, purifying and casting to obtain metallic aluminium. By utilizing the technical method in the invention, the problem of oversized thickness of an electrolytic interlayer in the electrolytic cell is solved, the cell voltage is reduced to 3.3-3.60V, and the current drain index for per ton of electrolytic aluminium is reduced by 1000kwh.

Description

technical field [0001] The invention relates to a process method for electrolyzing aluminum, in particular to a process method for electrolyzing aluminum at a cell voltage of 3.5V. [0002] Background technique [0003] The production of electrolytic aluminum is usually in such as figure 1 It is carried out in the electrolytic cell shown. The traditional process method is to dissolve solid alumina in the molten electrolyte at about 950 ° C, pass direct current from the anode, and the current passes through the liquid electrolyte and cathode aluminum liquid to the cathode carbon block, and then from the anode to the cathode carbon block. The cathode steel rod leads to the anode of the next electrolysis cell, where as the current passes through the liquid electrolyte layer, it electrochemically reacts with the alumina ions dissolved in the electrolyte. On the one hand, carbon dioxide gas is generated on the surface of the anode, and on the other hand, liquid aluminum is gene...

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Problems solved by technology

[0009] Aiming at the above-mentioned deficiencies in the prior art, the purpose of the present invention is to solve the problem that the electrolytic cell voltage is high due to the large anode distance in the process of electrolytic aluminum, so that the energy consumption of the electrolytic process is too large, and to provide a method that can be used in a 3.5V cell Process method of electrolytic aluminum under voltage

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