[China Aluminum Network] Because of the many impurities in the liquid in the electrolytic bath, it is necessary to filter the aluminum ingot before casting.
It is reported that the commonly used methods include: rely on the front, the solvent purification method is to use to participate in the solution of the solvent, the solvent has a small density, large activity, strong adsorption capacity and so on. After adsorbing the oxides in the solution, new droplets form to the surface. The scum is formed after cooling. Aluminum ingots can be cast without scum. second. Gas purification, commonly used gas mixture of chlorine, nitrogen or chlorine, is a primary method of primary aluminum purification.
(1) Chlorine gas purification. Chlorine is introduced into the liquid aluminum to generate many fine bubbles, which are abundantly mixed in the liquid of aluminum, dissolved hydrogen, and some mechanical inclusions, which can be adsorbed on the small bubbles. Follow the air bubbles to the surface of the molten aluminum and discharge it.
(2) Nitrogen purification method. Because chlorine is toxic and the cost is high, nitrogen purification appears. Alumina balls (418 mm) were used as the filter media. N2 directly into the liquid aluminum. The aluminum liquid is sent into the purification furnace one after another, passes through the alumina ball filter layer, and is flushed by nitrogen, so the non-metallic inclusions and dissolved hydrogen in the aluminum liquid can be removed and then discharged in series so that the fine nitrogen bubbles are evenly distributed. It plays a role of purification in the treated aluminum liquid.
(3) Mixed gas purification method. The mixture of chlorine and nitrogen is used to purify the aluminum liquid. Its role is to remove hydrogen and other 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 is also a choice of 10% chlorine + 10% carbon dioxide + 80% nitrogen. This works very well. Carbon dioxide can provide an excellent dispersion of chlorine and nitrogen, reducing operating time.
The company should select appropriate purification methods based on actual needs.
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