我厂采用地坑式焦炭护熔炼有色金属,坩埚材质为铸铁,容量为120公斤。过去,浇注大件是用捞包将合金液从坩埚中转入大包后进行的。这种操作方法,易使合金液产生严重的氧化吸气现象。吸入的气体,在合金液凝固过程中,随着溶解度逐渐降低,其中一部分可以逸出,一部分则留在合金中使铸件内部产生许多针状气孔,从而破坏了金属的机械性能而导致铸件报 I plant pit coking protection melting non-ferrous metals, crucibles made of cast iron, a capacity of 120 kg. In the past, casting bulky fishing is the alloy liquid from the crucible into the bales after. This method of operation, easy to make the alloy liquid produced serious oxidation inspiratory phenomenon. Inhalation of gas in the liquid alloy solidification process, with the gradual decrease in solubility, which can escape part of the alloy left in the casting to produce a lot of needle-like pores, thus undermining the mechanical properties of the metal led to casting