Liquid Aluminum Refining System –\u00a0Purification of aluminum from impurities<\/p>\n
For purification from non-metallic and gaseous impurities, as well as from compounds of sodium, magnesium and calcium, molten aluminum is purged with chlorine and settled in electric furnaces. In this case, there is a reaction:<\/p>\n
2Al + 3Cl2 \u00e0 2AlCl3<\/p>\n
Liquid Aluminum Refining System from Adtech China, pls contact sales@adtechamm.com<\/p>\n
the process goes at a temperature of 700 0C. Under these conditions, AlCl3 is in a gaseous state. When AlCl3 bubbles pass through molten aluminum, they are adsorbed on alumina particles, metal fluorides, and coal. Bubbles together with the solid phase rise up and form a loose gray layer on the surface, which is removed. In addition, the transmission of chlorine helps to remove gases from the metal. After purification, the Al content is 99.5 – 99.8%. It is suitable for most consumers, but sometimes more pure aluminum is required, and then it is subjected to deeper purification by zone melting or by distillation through subconnections.<\/p>\n
Zone melting<\/p>\n
Zone melting is based on the fact that the solubility of impurities in solid metal is lower than in molten. For zone melting, rods of diameter 15-20 mm and length 250-300 mm are cast from aluminum. One bar is placed in a boat of very pure graphite. The boat is placed in a quartz tube, in which a vacuum is created (residual pressure 10-4 mm Hg) to prevent aluminum oxidation.<\/p>\n
A ring inductor connected to a high frequency electric current source is placed around a quartz tube. Under the inductor, the rod is melted, and a zone of liquid aluminum appears.<\/p>\n
The inductor is moved along the bar at a speed of 1 mm \/ min. After 10-15 runs, the bar is removed and 80-100 mm cut. The remainder contains 99.9999% Aluminum.<\/p>\n
Subconnection Distillation<\/p>\n
Cleaning through the subconnects proceeds by passing vaporous aluminum chloride or fluoride over molten aluminum at a temperature of more than 10,000 \u00b0 C. Under these conditions, aluminum interacts with aluminum chloride by the reaction:<\/p>\n
AlCl3 + 2Al ↔ 3AlCl<\/p>\n
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When the temperature drops to 700-8000\u0421, the reverse reaction occurs, that is, AlCl decomposes into metallic Al and AlCl3. Impurities are not distilled. The aluminum content after cleaning by this method is 99.99999%.<\/p>","protected":false},"excerpt":{"rendered":"
Liquid Aluminum Refining System –\u00a0Purification of aluminum from impurities For purification from non-metallic and gaseous impurities, as well as from compounds of sodium, magnesium and calcium, molten aluminum is purged with chlorine and settled in electric furnaces. In this case, there is a reaction: 2Al…<\/p>","protected":false},"author":1,"featured_media":4152,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":[],"categories":[26523],"tags":[],"yoast_head":"\n