Smelting of oxygen free copper

Strictly distinguish, oxygen free copper should be divided into ordinary and high purity anaerobic copper. Ordinary oxygen free copper can be smelted in a power frequency core induction furnace, while high purity oxygen-free copper should be smelted in a vacuum induction furnace.
When semi continuous casting is used, the refining process of melt in the melting furnace and the holding furnace can be free from time constraints. Continuous casting is different. The quality of liquid copper not only depends on the refining quality of melting furnace and holding furnace, but also depends on the stability of the whole system and the whole process.
In order not to make the melt contaminated, oxygen free copper smelting generally does not use any additives in the way of smelting and refining, the surface of the molten pool covered with charcoal and the resulting reducing atmosphere is the most commonly used melting atmosphere.
Induction electric furnace
The induction furnace for smelting copper without oxygen shall have good sealing.
High quality cathode copper should be used as raw material for smelting anaerobic copper. High purity cathode copper should be used as raw material for smelting high purity oxygen free copper. If the copper cathode is dried and preheated before entering the furnace, it can remove the moisture or moist air that may be adsorbed on its surface.
When melting oxygen free copper, the thickness of the charcoal layer covered on the surface of the molten pool in the furnace should be doubled than that when melting ordinary pure copper, and the charcoal needs to be updated in time. Although charcoal mulching has many advantages, such as insulation, air isolation and reduction, it also has certain disadvantages. Charcoal, for example, is easy to absorb humid air, or even directly absorb water, which makes it possible for liquid copper to absorb a large number of hydrogen channels.
Charcoal or carbon monoxide can reduce cuprous oxide, but hydrogen is completely powerless. Therefore, charcoal should be carefully selected and calcined before it is added to the furnace.


Post time: Nov-30-2022
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