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随着废钢积累和在炼钢过程的循环利用,钢中Cu含量不断增高,影响钢铁产品质量,严重制约了废钢的利用。因此,需要在冶金过程中将Cu尽可能脱除。然而,Cu的热力学性质决定了冶金过程的氧化和还原精炼难以将Cu从铁液或钢液中去除。在分析总结现有各种脱铜方法的基础上,提出了一种基于选择性氯化和挥发的新方法,其要点为:首先使铁水或钢液中的Cu部分氧化进入熔渣,然后通过熔渣中Fe和Cu的选择性氯化和挥发反应,最终Cu以高挥发性的氯化物形式得到脱除。目前的研究表明该方法理论上可行,初步的试验结果也证实可有效地进行Cu,Fe的分离,渣系的氧化性和组成对脱铜过程有重要的影响。
With the accumulation of scrap and its recycling in the steel making process, the content of Cu in steel is continuously increasing, which affects the quality of steel products and severely restricts the utilization of scrap. Therefore, Cu needs to be removed as much as possible in the metallurgical process. However, the thermodynamic properties of Cu determine that oxidation and reduction refining of metallurgical processes make it difficult to remove Cu from molten iron or molten steel. On the basis of analyzing and summarizing the existing methods of copper removal, a new method based on selective chlorination and volatilization is proposed. The main points are as follows: the Cu in molten iron or molten steel is partially oxidized into the slag and then passed Selective chlorination and volatilization of Fe and Cu in the slag, eventually Cu is removed as highly volatile chlorides. The current research shows that this method is theoretically feasible. The preliminary test results also prove that the separation of Cu and Fe can be effectively carried out. The oxidation and composition of the slag system have an important influence on the copper removal process.