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在世界经济中,高纯电解铜是一种重要的商品,主要用来生产铜线。全球冶炼厂处理来自不同产地的矿石,生产出高纯电解铜。这些铜精矿通常含有0.1%的铋。如果最终产品中的铋含量超过2×10~(-6),会导致产品出现脆性,使得铜产品不适合用于拉丝生产。IBC先进技术有限公司开发出一种有效的除铋系统,用于分离铜电解液中溶解的铋,使铋含量达到一个理想的水平。该系统与铜生产系统一体化,可实现连续作业。IBC采用一种分子识别技术(MRT)工艺来进行分离作业。在该工艺中,专门设计的螯和剂或配位体与固体骨架(例如硅胶)进行化学结合,产生一种称为SuperLig~的固相系统。这套除铋系统已经用于几家电解厂的铜精炼生产中。本文介绍了从铜电解液中分离和回收铋的工艺步骤,这些工艺步骤包括:吸收、一段洗涤、预解吸、主要解吸、后解吸、二段洗涤、铋沉淀,给出了每个步骤控制和监测的项目。本文讨论了采用其它技术控制铋的局限性。作者还介绍了MRT系统为铜电解厂带来的经济效益,这些铜电解厂都存在铋的问题。
In the world economy, high purity electrolytic copper is an important commodity that is mainly used to produce copper wire. Global smelters deal with ores from different sources to produce highly pure copper. These copper concentrates usually contain 0.1% bismuth. If the content of bismuth in the final product exceeds 2 × 10 -6, the brittleness of the product is caused, making the copper product unsuitable for drawing production. IBC Advanced Technologies Ltd. has developed an effective bismuth removal system for the separation of dissolved bismuth in a copper electrolyte to achieve an ideal level of bismuth content. The system is integrated with the copper production system for continuous operation. IBC uses a Molecular Recognition Technology (MRT) process for separation. In this process, specially designed chelating agents or ligands are chemically bound to a solid framework, such as silica gel, to produce a solid phase system called SuperLig®. This set of bismuth removal systems have been used in copper refinery production at several electrolysis plants. This article describes the process steps for the separation and recovery of bismuth from a copper electrolyte. These steps include absorption, a wash, pre-desorption, major desorption, post-desorption, two-stage washing, and bismuth precipitation. Monitored items. This article discusses the limitations of using other techniques to control bismuth. The authors also describe the economic benefits that MRT systems bring to copper electrolysis plants, all of which have bismuth problems.