利用熔融分步还原法优化铜渣贫化效果及渣型结构

材料导报

2019, Vol. 33

Issue (Z2): 505-511

金属与金属基复合材料

利用熔融分步还原法优化铜渣贫化效果及渣型结构

孙雪玮^1,2, 王杨^1,2, 胡建杭^1,2

1 冶金节能减排教育部工程研究中心, 昆明 650093;
2 昆明理工大学冶金与能源工程学院,昆明 650093

The Dilution Effect and Slag Shape Structure of Copper Slag Optimized by Melting Step Reduction Method

SUN Xuewei¹, WANG Yang^1,2, HU Jianhang^1,2

1 Engineering Research Center of Metallurgical Energy Conservation and Emission Reduction, Ministry of Education, Kunming University of Science and Technology, Kunming 650093;
2 Faculty of Metallurgical and Energy Engineering, Kunming University of Science and Technology, Kunming 650093

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摘要根据铜渣中物相成分及熔池熔炼过程工艺特点,对高温条件下熔融铜渣还原过程热力学以及实验过程进行了研究。传统的铜渣一步还原金属回收法,产物中往往得到大量金属合金,降低了熔渣中金属回收率,为避免还原程度控制不当生成金属合金,本实验采用分步还原法分别对铜渣中的有价金属铜、铁进行回收,分析了熔池温度、助熔剂CaO和还原剂炭粉添加量对渣还原贫化过程中贫化效果的影响,掌握了还原过程中渣结构的类型转变。结果表明,温度1 350 ℃,沉降时间40 min,熔渣中CaO控制量为22%(质量分数,下同),还原剂炭粉添加量为2.29%时,渣中Cu₂O的还原率达到95.36%,而还原剂炭粉量控制为8%时,渣中铁相沉降率和金属化率分别达到83.13%和85.30%。此时,由于贫化条件的适当控制,避免了铜铁金属混合物的还原析出,实现了渣中铜铁相的深度贫化,促进了铜熔渣贫化效果。此外,铜渣还原贫化过程中,由于助熔剂CaO和还原剂炭粉的添加,熔渣中铁氧化物被控制进行逐步还原,促使渣型由结构复杂的SiO₂-Fe₃O₄-FeO高粘度渣系逐步转变为结构简单、低粘度、低熔点的CaO-Al₂O₃-SiO₂三元渣系,体系渣型得到了有效优化,为后续铜渣的资源化利用提供了性能稳定的渣型。

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	孙雪玮
	王杨
	胡建杭

关键词: 铜渣分步还原深度贫化渣型

Abstract: The thermodynamics and experimental process of reduction of molten copper slag at high temperature were studied according to the phase composition of copper slag and the process characteristics of molten pool melting. The traditional one-step reduction metal recovery method of copper slag often produces a large number of metal alloys in the products, which reduces the metal recovery rate. In order to avoid improper control of reduction degree to generate metal alloy, this experiment adopted steps reduction method to recover valuable metal copper and iron in copper slag respectively, and analyzed the influence of melting pool temperature, the addition amount of flux CaO and reducing agent carbon powder on the dilution effect of slag, and mastered the transformation of slag type during reduction and dilution process. The results showed that the reduction rate of Cu₂O in slag reached 95.36% for the temperature 1 350 ℃, the settling time 40 min, the CaO control amount in slag 22% and the reducing agent charcoal powder 2.29%. When the amount of reducing agent charcoal powder was controlled at 8%, the iron phase deposition rate and metallization rate reached 83.13% and 85.30% respectively. At this time, due to proper control of the dilution conditions, reduction and precipitation of the mixture of copper and iron metals are avoided. The deep dilution of copper and iron phase in slag is realized, and the effect of copper slag dilution is promoted. In addition, in the process of the reduction and dilution, because of the flux CaO and reducing agent carbon powder added, iron oxide in the copper slag were controlled to be gradually reduced, and the slag type was transformed from SiO₂-Fe₃O₄-FeO high viscosity slag system with complex structure to SiO₂-Al₂O₃-CaO ternary slag system with the low viscosity and low melting point. The slag type of the system has been effectively optimized, and it provides a stable slag type for the subsequent resource utilization of copper slag.

Key words: copper slag step reduction deep dilution slag type

出版日期: 2019-11-25 发布日期: 2019-11-25

ZTFLH:

F416.32

基金资助: 国家自然科学基金(51376085);国家自然科学基金青年基金(U1602272)

通讯作者: hujh51@126.com

作者简介: 孙雪玮,于2019年6月毕业于昆明理工大学,获得硕士学位。主要从事二次资源回收再利用领域的研究。
胡建杭,教授, 现就职于昆明理工大学冶金与能源工程学院。2007年12月获昆明理工大学冶金能源工程专业博士学位,澳大利亚悉尼大学访问学者。2011年入选云南省中青年学术和技术带头人后备人才。获中国有色金属工业科学技术奖一等奖、省科技一等奖等省部级奖7项。主要从事高价值能源转化和新能源开发领域的技术基础理论和应用关键技术的科学研究。发表论文50余篇,被EI、SCI收录20篇,出版学术专著4部,获国家专利授权40余项。

引用本文:

孙雪玮, 王杨, 胡建杭. 利用熔融分步还原法优化铜渣贫化效果及渣型结构[J]. 材料导报, 2019, 33(Z2): 505-511.
SUN Xuewei, WANG Yang, HU Jianhang. The Dilution Effect and Slag Shape Structure of Copper Slag Optimized by Melting Step Reduction Method. Materials Reports, 2019, 33(Z2): 505-511.

链接本文:

http://www.mater-rep.com/CN/ 或 http://www.mater-rep.com/CN/Y2019/V33/IZ2/505

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