At present, there are two main methods for producing recycled copper in my country: the first type is to directly smelt the scrap copper into different grades of copper alloy or refined copper, so it is also called the direct utilization method; the second type is to heat the miscellaneous copper first Processed into anodized copper. It is then electrolytically refined into electrolytic copper and other valuable elements are recovered during the electrolysis process. When treating copper-containing waste by the second type of method, there are usually 3 different processes, namely the one-stage method, the two-stage method and the three-stage method.

1 paragraph

The method of directly adding the classified yellow miscellaneous copper or purple miscellaneous copper to the reverberatory furnace to refine it into anode copper. The advantages are that the process is short, the equipment is simple, the plant is fast to build, and the investment is low. However, when this method is used to process miscellaneous copper with complex composition, the dust composition produced by this method is complex and difficult to handle;

At the same time, the furnace time of refining operation is long, labor intensity is high, production efficiency is low, and metal recovery rate is also low.

2 two-stage method

The miscellaneous copper is first reduced and smelted in a blast furnace to obtain metallic copper. Then the metal copper is refined into anode copper in a reverberatory furnace; or miscellaneous copper is first blown into blister copper through a converter. It is then refined into anode copper in a reverberatory furnace. Since these two methods have to go through two processes, they are called two-stage methods. The metal copper obtained by blast furnace smelting has a high impurity content and is black, so it is called black copper.

3 three-stage method

The miscellaneous copper is first reduced and smelted into black copper in a blast furnace, and the black copper is blown into secondary blister copper in a converter, and the secondary blister copper is refined into anode copper in a reverberatory furnace. The raw materials must be processed in 3 processes to produce qualified anode copper, so it is called the three-stage method. The three-stage method has the advantages of good comprehensive utilization of raw materials, simple and easy processing of the output smoke and dust, high blister copper grade, easier operation of the refining furnace, and high equipment productivity. And more fuel consumption and other advantages. Therefore, in our country, except for the enterprises with larger gauge membranes or need to deal with some special waste residues, the general waste copper treatment process mostly adopts the two-stage method and the one-stage method.