Cast copper parts are closely related to daily life. Fo […]
Cast copper parts are closely related to daily life. For example, door handles, door locks, radiators, water pipes, iron pans, gas hobs, irons, etc., which are often used, are castings.
There are many classification methods for castings: according to the color classification, they are generally divided into four categories:
Copper: refers to pure copper, the main varieties are oxygen-free copper, copper, phosphorus deoxidized copper, silver copper;
Brass: refers to copper and zinc-based alloys, and can be subdivided into simple brass and complex brass. In the complex brass, the third group is titled nickel brass, silicon brass, etc.;
Bronze: refers to copper-based alloys other than copper-nickel and copper-zinc alloys. The main varieties are tin bronze, aluminum bronze, and special bronze (also known as high-copper alloy);
White copper: refers to copper-nickel alloys; brass copper-zinc alloys. The color changes from yellowish red to yellow when the amount of zinc increases. The mechanical properties of brass are higher than that of pure copper. Under normal conditions, it will not corrode or corrode. It has good plasticity and is widely used in machinery manufacturing to make various structural parts.
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 composition of the soot is 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.
1. The copper is first smelted by a blast furnace to obtain metallic 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 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.
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 material has to undergo 3 steps 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 the refining furnace, and high equipment productivity.