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在“实用铸铝技术”一文中(《现代铸造》1981年12月)谈到,当用氮气精炼时采用石墨管把气体引入铝中是不合适的。试验表明,这会在金属内产生石墨夹杂物。这种意见是由Brant,Bone和Emley通过试验得出的。在他们的试验中,通过石墨管把氮气引入铝-镁(4%)合金内,持续时间为0、5、10、15、20和25min中。尽管在未熔化的金属内没发现黑色夹杂物,但在精炼5～25min的金属中发现黑色夹杂物
In the article “Practical Casting Technology” (“Modern Casting” December 1981), it was not appropriate to use graphite tubes to introduce gas into aluminum when purging with nitrogen. Experiments have shown that this produces graphite inclusions in the metal. This opinion was drawn experimentally by Brant, Bone and Emley. In their experiments, nitrogen was introduced into the aluminum-magnesium (4%) alloy via a graphite tube for 0, 5, 10, 15, 20 and 25 min. Although no black inclusions were found in the unmelted metal, black inclusions were found in the metal refined for 5-25 minutes