There are two basic methods for producing recycled copper

At present, there are two main methods to produce recycled copper in China: the first is to directly smelt the waste mixed copper into different grades of copper alloy or fine copper, so it is also called direct utilization method; The second is to cast the anode copper by fire treatment. It is then electrolytically refined to electrolytic copper and other valuable elements are recovered in the process. There are usually three different processes for the second type of copper-containing waste, namely one - stage, two - stage and three - stage processes.

The method of refining the classified yellow copper or purple copper into anode copper directly by adding it to the reverberator. The advantages of this method are short process, simple equipment, fast plant construction and less investment. However, when the method is used to deal with complex copper, the composition of soot is complex and difficult to deal with.

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

Mixed copper is first reduced and smelted by blast furnace to get metal copper. Then the metal copper is refined into anode copper in the reverberator; Or miscellaneous copper first through the converter blowing into coarse copper. The anode copper is then refined in the reverberator. Since both methods go through two procedures, they are called two-stage methods. The metal copper obtained by blast furnace melting has higher impurity content and is black, so it is called black copper.

Mixed copper is first reduced and smelted into black copper by blast furnace, and the black copper is blown into secondary coarse copper in converter, and the secondary coarse copper is refined into anode copper in the reverberator. The raw material needs to go through three 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 composition of the output dust, easy treatment, high grade of crude copper, easy operation of the refining furnace, higher equipment productivity, but also has the advantages of more complex process, more equipment, large investment and more fuel consumption. Therefore, in our country, except for the enterprises with large regulation film or some special waste slag, the general waste copper processing process is mostly adopted by two-stage method and one-stage method.