At present, there are two main methods for producing recycled copper in China:
The first type is the direct smelting of waste copper into different grades of copper alloy or refined copper, so it is also called direct utilization method.
The second type is to process the copper by the fire treatment. It is then electrolytically refined into electrolytic copper and other valuable elements are recovered during the electrolysis process. When using the second type of method to treat copper-containing scrap, there are usually three different processes, one-stage, two-stage, and three-stage.
l one method
The classified yellow copper or purple copper is directly added to a reverberatory furnace to be refined into an anode copper. The advantages are short process, simple equipment, fast construction, and low investment. However, when the method deals with complex copper, the smoke and dust components are complicated and difficult to handle;
At the same time, the furnace life of the refining operation is large, the labor intensity is high, the production efficiency is low, and the metal recovery rate is also low.
2 two-stage method
2. The copper is first smelted by blast furnace to obtain metal copper. Then the metal copper is refined into anode copper in a reverberatory furnace; or the copper is first blown into a thick copper by a converter. It is then refined into anode copper in a reverberatory furnace. Since these two methods go through two processes, they are called the two-stage method. The metal copper obtained by smelting furnace smelting has a high impurity content and is black, so it is called black copper.
3 three-stage method
The copper is first smelted into black copper by a blast furnace, and the black copper is blown into secondary blister copper in the converter, and the secondary blister copper is refined into anode copper in a reverberatory furnace. The raw materials must be processed through three processes to produce qualified anode copper, so it is called the three-stage method. The three-stage method has the advantages of comprehensive utilization of raw materials, simple and easy-to-handle soot composition, high grade of crude copper, easy operation of refining furnace, and high equipment productivity. However, the process is complicated, the equipment is large, and the investment is large. And fuel consumption and other advantages. Therefore, in addition to the large-scale enterprises in China or the need to deal with some special wastes, the general waste copper treatment process uses two-stage method and one-stage method.
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