[China Aluminum Network] Because there are many impurities in the molten aluminum in the electrolytic cell, the aluminum ingot must be filtered before the casting of aluminum ingots, commonly used methods, solvents, gases and clarification of the purification method.
The following briefly describes the solvent purification method and gas purification method
1. Solvent purification method is to use the solvent added to the solution, the solvent has the characteristics of small density, large activity, strong adsorption capacity. By adsorbing oxides in the solution, new droplets form to the surface. Scum formed after cooling. Aluminum ingots can be cast to remove scum.
2. Gas purification, commonly used chlorine, nitrogen or chlorine-nitrogen mixed gas, is a major primary aluminum purification method.
(1) Chlorine gas purification. Chlorine is introduced into the liquid aluminum to generate many fine bubbles, which are fully mixed in the aluminum liquid, and the dissolved hydrogen therein, as well as some mechanical inclusions, can be adsorbed on the small air bubbles. As the bubbles rise to the surface of the aluminum liquid, they are discharged.
(2) Nitrogen purification method. Because chlorine is toxic and expensive, nitrogen purification occurs. Alumina balls (418 mm) were used as the filter media. N2 directly into the liquid aluminum. The molten aluminum is continuously fed into the purifier, passes through the alumina ball filter, and is flushed with nitrogen. The non-metallic inclusions and dissolved hydrogen in the molten aluminum are then removed and continuously discharged, so that the fine nitrogen bubbles are evenly distributed. In the treatment of aluminum liquid play a role in purification.
(3) Mixed gas purification method. A mixture of chlorine and nitrogen is used to purify the aluminum liquid. Its role is to remove hydrogen and separate oxides on the one hand, and to remove certain metal impurities (such as magnesium) on aluminum. The commonly used composition is 90% nitrogen + 10% chlorine. . There are also 10% chlorine + 10% carbon dioxide + 80% nitrogen. This works better. Carbon dioxide can spread chlorine and nitrogen well, reducing operating time.
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