碳热还原-碱浸工艺实现铜渣中硅和铁的分离(英文)
发布时间:2023-03-24 18:28
以铜精矿为原料,采用火法冶炼工艺每生产1.0 t金属铜将产生2.0~3.0 t含铁35%~45%的铜渣。因此,从铜渣中回收铁不仅能实现有价金属的提取,还能减少其因堆存而带来的环境问题。本文提出了一种通过选择性脱硅而实现铜渣中铁富集的新方法。热力学计算及实验结果表明,铜渣中的铁在1473K碳热还原60min可被完全还原为金属铁,此时氧化硅转变为游离的石英固溶体和方石英固溶体。石英固溶体和方石英固溶体均易溶于碱溶液而金属铁不溶于碱溶液。在最佳浸出条件下,铜渣还原焙烧产物中的氧化硅可降低至6.02%,同时获得含铁87.32%的浸出渣。浸出渣中锌含量低于0.05%。本研究为铜渣中硅和铁综合提取新技术的开发奠定基础,并避免二次尾矿的产生。
【文章页数】:10 页
【文章目录】:
1 Introduction
2 Experimental
2.1 Materials
2.2 Procedures
2.3 Theoretical fundamental
2.3.1 Carbothermic reduction
2.3.2 Alkaline leaching of silica
3 Results and discussion
3.1 Characteristics of CS
3.2 Phase transformation of CS during carbothermic reduction
3.2.1 XRD analysis
3.2.2 SEM-EDS analysis
3.2.3 FTIR analysis
3.3 Removal of silica by alkaline leaching
3.4 Analysis of leaching residue
3.4.1 XRD analysis
3.4.2 SEM-EDS analysis
3.4.3 Chemical compositions
4 Conclusions
本文编号:3769624
【文章页数】:10 页
【文章目录】:
1 Introduction
2 Experimental
2.1 Materials
2.2 Procedures
2.3 Theoretical fundamental
2.3.1 Carbothermic reduction
2.3.2 Alkaline leaching of silica
3 Results and discussion
3.1 Characteristics of CS
3.2 Phase transformation of CS during carbothermic reduction
3.2.1 XRD analysis
3.2.2 SEM-EDS analysis
3.2.3 FTIR analysis
3.3 Removal of silica by alkaline leaching
3.4 Analysis of leaching residue
3.4.1 XRD analysis
3.4.2 SEM-EDS analysis
3.4.3 Chemical compositions
4 Conclusions
本文编号:3769624
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