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| 还原气氛下温度对镀锌废钢脱锌的影响 | |
| 引用本文： | 肖丽俊,殷志宏,赵腾飞,朱正海,孙前进.还原气氛下温度对镀锌废钢脱锌的影响[J].中国冶金,2021,31(9):123-129. |
| 作者姓名： | 肖丽俊 殷志宏 赵腾飞 朱正海 孙前进 |
| 作者单位： | 1.钢铁研究总院连铸技术国家工程研究中心, 北京 100081; 2.安徽工业大学冶金工程学院, 安徽 马鞍山 243032; 3.欧冶链金再生资源有限公司, 安徽 马鞍山 243011 |
| 基金项目： | 国家自然科学基金资助项目(51974003); 国家重点研发计划资助项目(2017YFB0305100) |
| 摘 要： | 通过火法脱锌试验及SEM、EDX和XRF等分析方法,研究了镀锌废钢在还原气氛条件下锌及基体的变化,从热力学角度探讨了脱锌机理。结果表明,低温时锌在钢基体表面形成较薄的氧化膜,厚度随温度上升而增加,明显的黄色氧化锌层在850 ℃以上形成,并在950 ℃消失;还原性气氛下950 ℃时脱锌效果最佳,表面锌质量分数小于2%;在火法脱锌过程,钢基体表面的锌经历了氧化、还原和气化脱除3个阶段。研究对于开发镀锌废钢的火法脱锌技术具有重要意义。 |
| 关 键 词： | 镀锌废钢 氧化锌 脱锌 还原 气化 热力学 |
Effect of temperature on dezincification of galvanized scrap in reducing atmosphere |
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| XIAO Li-jun,YIN Zhi-hong,ZHAO Teng-fei,ZHU Zheng-hai,SUN Qian-jin.Effect of temperature on dezincification of galvanized scrap in reducing atmosphere[J].China Metallurgy,2021,31(9):123-129. | |
| Authors: | XIAO Li-jun YIN Zhi-hong ZHAO Teng-fei ZHU Zheng-hai SUN Qian-jin |
| Affiliation: | 1. National Engineering Research Center of Continuous Casting Technology, Central Iron and Steel Research Institute, Beijing 100081, China;2. College of Metallurgical Engineering, Anhui University of Technology, Ma'anshan 243032, Anhui, China;3. Ouyeel Reproductive Resource Recycling Co., Ltd., Ma'anshan 243011, Anhui, China |
| Abstract: | The changes of zinc and matrix for galvanized scrap in reducing atmosphere were studied by means of SEM, EDX, XRF and pyrometallurgical. The mechanism of dezincification was discussed by thermodynamics theory. The results show that zinc forms a thin oxide film on surface of scrap matrix at low temperature. The film thickness increases with the increase of temperature. The obvious yellow zinc oxide layer formed above 850 ℃ and disappeared at 950 ℃. The best dezincification effect was obtained at 950 ℃ in reducing atmosphere, and the zinc content on surface of scrap matrix was less than 2%. In the process of pyrometallurgical dezincification, zinc on surface of scrap matrix went through three stages, oxidation, reduction and gasification. The research has great significance for development of fire dezincification technology of galvanized scrap. |
| Keywords: | galvanized scrap zinc oxide dezincification reduction gasification thermodynamics |
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