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目前,国内外铝加工工业大都采用熔体—气体对流方式对铝合金熔体进行除气处理。由于氮气具有无毒性,操作方便等优点,所以在工业上得到广泛应用。除氮气外,还有氦、氩等惰性气体也可作为精炼气体,但都不及氮气价廉。在对铝合金熔体精炼时,要求精炼气体既不能与熔融金属发生化学反应,也不能溶解于金属之中,因此必须严格控制氮气中水气和氧气的含量。据有关资料介绍,若精炼氮气中水气和氧气的含量小于10(ppm),其除气效果是十分理想的。熔铸分厂于一九八四年三月开始对如何降低我厂生产的瓶装氮气中的水气和氧气含量进行了试验研究。经过一年多的努
At present, most of the domestic and foreign aluminum processing industries use melt-gas convection to degas the aluminum alloy melt. Because of its non-toxic nitrogen, easy to operate, etc., it is widely used in industry. In addition to nitrogen, but also helium, argon and other inert gases can also be used as refining gas, but not as cheap as nitrogen. In the refining of aluminum alloys, the refined gas is required to neither chemically react with the molten metal nor to dissolve in the metal. Therefore, the amount of moisture and oxygen in the nitrogen must be strictly controlled. According to the information, if the refined nitrogen and water vapor content of less than 10 (ppm), the degassing effect is very satisfactory. In March 1984, the foundry branch started a pilot study on how to reduce the contents of moisture and oxygen in bottled nitrogen produced by our factory. After more than a year of effort