Aluminum ash raw materials are dispersed and gravity winnowed: The aluminum ash in the production process of electrolytic aluminum and recycled aluminum is dispersed at the feed port of the gravity separator through the metering and belt conveying system, and separated by gravity and wind.

The sulfur-making process completes the separation of copper and most of the iron. Finally, the iron, sulfur and other impurities in the copper matte need to be removed to obtain blister copper. The copper matte also needs to be blown.

The traditional matte-making smelting process includes blast furnace, reverberatory furnace and electric furnace smelting. The degree of oxidative desulfurization is very low. Air is used as the oxidant to generate low-grade matte. A small part of the heat required for melting uses the oxidation reaction heat, and most of it requires additional heating.

In recent years, the world's copper smelting technology has made great progress. Currently, more than 80% of the world's copper is produced through pyrometallurgical smelting processes.