废杂铜直接制杆产业化成套技术

Industrialized Complete Technology of Direct Making Rod with Scrap Copper

中国废杂铜约94%用于再生铜杆,但存在废杂铜分类回收体系及渠道不规范、制杆技术和装备落后、评估标准和体系不完善等问题,以致再生铜杆品质不高。本文针对上述难题,在国家科技支撑计划项目等支持下,通过产学研合作,历经十年,研制出废杂铜预处理系统,建立了废杂铜原料分类体系,实现了废杂铜快速除杂;集成创新了“竖炉+精炼炉+保温炉”新型冶金炉组,成功地以铜含量92%及以上的废杂铜连续生产出合格的电工用铜液(Cu+Ag≥99.90%,O<400×10^(-6)),实现了低品位废杂铜直接制杆;创新了五轮式连铸、两辊式连轧及其整个辅助系统,实现了连铸液位自动控制与冶金炉组联动控制,稳定生产出了高质量再生铜杆并建立了示范线。再生铜杆经国家电线电缆检测中心检测,主成分(Cu+Ag)≥99.90%,导电率≥100.5%IACS,氧含量<400×10^(-6),延伸率≥38%,达到了国标和行标的要求。

About 94%scrap copper is used for recycled copper rod in China.However,there are problems such as non-standardized classification and recycling system for scrap copper,backward technology and equipment for manufacturing rods,and imperfect stan⁃dards and evaluation systems,which lead to low quality of recycled copper rods.In order to solve these problems,with the support of National Science and Technology Support Program,through cooperation of industry,university and research for ten years,this paper de⁃veloped industrialized complete technology of direct making rod with scrap copper.The classification system of scrap copper was estab⁃lished,and it realized rapid impurity removal from scrap copper.An innovative furnace group was integrated,which combined shaft fur⁃nace,refining furnace and holding furnace.The qualified copper melt(Cu+Ag≥99.90%,O<400×10^(-6))for electrical engineering was successful continuously produced by scrap copper with copper content of 92%or more.The direct making rod of low-grade scrap cop⁃per was realized.Five wheels continuous casting,two rolls continuous rolling and the whole auxiliary system were developed,which could automatically control continuous casting copper melt level and joint coordination of metallurgical furnace group.A demonstration line which could stably product high-quality recycled copper rods was established.The results of National Wire and Cable Testing Center showed that main component(Cu+Ag)was beyond 99.90%,conductivity was beyond 100.5%IACS,oxygen content was below 400×10^(-6) and elongation was beyond 38%,which met the requirements of national and industrial standards.