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摘要:
钽是一种稀有金属,被视为新兴战略金属,广泛应用于多个领域,特别是在能源、国防、高新科技等领域具有不可替代的作用,并随着应用范围日益扩大,用量大幅度增加。铌和钽在自然界中一般呈类质同象混合物的形式存在,目前从铌钽精矿中提钽是最常见的回收钽资源的方法之一。文章概述了从铌钽精矿中提钽的工艺,主要包括精矿分解工艺和铌钽分离工艺。同时介绍和总结了从废硬质合金、废钽电容器、冶金渣等二次原料中提钽的方法,最后对提钽的发展方向进行了展望。
Abstract:Tantalum is an extremely rare precious metal, which is regarded as an emerging strategic metal. It is widely used in many fields, especially in the fields of energy, national defense, high and new science and technology, and plays an irreplaceable role. With the increasing application scope, the amount of Tantalum increases greatly. Niobium and tantalum generally exist in the form of isomorphic mixture in nature. At present, tantalum extraction from niobium and tantalum concentrate is one of the most common ways to recover tantalum resources. This paper summarizes the process of tantalum extraction from niobium tantalum concentrate including concentrate decomposition process and niobium tantalum separation process. At the same time, the methods of extracting tantalum from secondary raw materials such as waste carbide, waste tantalum capacitor and metallurgical slag are introduced and summarized. Finally, the development direction of tantalum extraction is prospected.
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Key words:
- tantalum /
- niobium tantalum concentrate /
- secondary raw material /
- extraction
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图 1 钽的主要应用领域[4]
Figure 1.
图 2 2015~2019年全球钽储量统计[9]
Figure 2.
图 8 溶剂萃取法工艺流程[19]
Figure 8.
图 11 钽合金废料中回收钽工艺流程[39]
Figure 11.
图 12 从废钽靶材中回收钽工艺流程[42]
Figure 12.
图 13 陈振洋等人提出的钽电容回收流程[44]
Figure 13.
表 1 各种萃取剂的优缺点[32]
Table 1. Advantages and disadvantages of various extractants
名称 优点 缺点 MIBK 选择性高,纯水反萃钽饱和容量大,比重轻,黏度小,操作稳定 水溶性大,挥发大,损耗大,价格贵 2-OCL 选择性好,水溶性小,单价低,成本低 黏度大,操作难控制,气味较难闻 DMAC 水溶性小 选择性差,不能用纯水反萃钽 TBP 挥发性小,劳动条件好 选择性差,产品质量不稳定 -
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