Multi-cavity slag retaining mechanism for molten metal and method for recovering fluorine salt in aluminum electrolytic cell

Abstract

The invention relates to the field of casting and metal electrolytic smelting, in particular to a multi-cavity slag stop mechanism for metal liquid and a method for recovering villaumite from an aluminum electrolysis bath. The mechanism comprises a separation wall arranged in a metal liquid container cavity; the separation wall divides the metal liquid conducting part in the metal liquid containercavity as a flowing-in cavity and the metal liquid flowing-out part as a flowing-out cavity; a communicating hole is formed in the bottom of the separation wall; a flowing mouth for enabling metal liquid to flow out from the flowing-out cavity is arranged on the cavity wall of the metal liquid container cavity corresponding to the flowing-out cavity; and an included angle between the part, corresponding to the flowing-out cavity, of the separation wall and the flowing-out direction of the metal liquid from the flowing mouth is larger than 45 degrees. In the electrolytic aluminum production process, aluminum liquid is sucked from the electrolysis bath through a vacuum negative-pressure hoisting bag with the multi-cavity slag stop mechanism; and then, the stop collecting effect of the multi-cavity slag stop mechanism on slag is used for conveniently collecting the sucked electrolyte and slag to feed in the electrolysis bath again, so that the investment cost of electrolytic aluminum additives is greatly saved.

Description

technical field [0001] The invention relates to the field of casting and metal electrolytic smelting, in particular to a multi-cavity slag retaining mechanism for molten metal and a method for recovering fluorine salt in an aluminum electrolytic cell. Background technique [0002] 1. In the field of metallurgy, although various transfer ladles, pouring ladles, vacuum negative pressure ladles, mixing furnaces and smelting furnaces for aluminum deep processing and casting are used for liquid metal transfer, temporary storage or quenching and tempering, although the sizes are different, the specifications and volumes Large ones can store hundreds of tons of molten metal, and small ones can store tens of kilograms of molten metal, but generally only contain one chamber. In the process of pouring the molten metal in the chamber to the next process container, since this type of equipment does not have the ability to stop slag, it is easy to pour the slag floating on the upper laye...

AI Technical Summary

Problems solved by technology

Due to the large liquid surface area, the slag is dispersed into a thin layer on the liquid surface, which makes slag breaking difficult, labor-intensive, and it takes a long time to stand still and slag breaking, and new slag is likely to be generated

[0004] During the melting process of metals (such as aluminum, copper, lead and other metals and their waste materials), the following problems occur: 1. Due to the large melting furnace chamber, the melting heat loss is relatively large; 2. When slag is generated, it is difficult to remove slag and It is easy to carry slag in the subsequent process; 3. The slag sticks to the furnace body, resulting in a decrease in the capacity of the furnace molten pool; 4. The chamber is too small to store the molten metal, which affects the output

Other fluoride salt additives are consumed, plus these costs more

[0011] 2. There are electrolytes and aluminum oxide slag in the sealed negative pressure carrier, which stick to the inner wall of the bag, resulting in reduced capacity and difficult cleaning, requiring frequent minor or major repairs

Inhalation of air when pouring aluminum leads to increased aluminum oxidation in the next process

[0012] 3. The slag in the aluminum furnace sticks to the inner wall of the molten pool of the furnace, resulting in a reduction in capacity, which requires major or minor repairs in advance

High labor intensity and large dust

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