提高阳极铜中砷含量的生产实践

Production practice of increasing arsenic content of anode copper

阳极铜中砷含量过高或者过低都不利于电解精炼生产,谦比希铜冶炼有限公司生产的粗铜平均砷含量仅0.004 5%,导致了该粗铜在电解精炼过程中易出现阳极钝化、浮泥增加、阴极顶部结瘤、阴极表面质量下降、电流效率降低等问题。针对此现象,该公司追踪铜冶炼过程中砷的走向及分布,分析总结出阳极铜砷含量偏低的原因,并找到了添加砷铜合金提高阳极铜砷含量的最佳操作:粗铜火法精炼还原结束后加入砷铜合金,控制炉内氮气搅拌流量至200~250 L/min,反复转动炉子,15 min后开始浇铸。该技术操作不但可解决铜产品砷含量低的问题,而且可使阳极铜中砷含量分布更均匀,利用率更高。

Too high or too low arsenic content in anode copper is not conducive to the electrolytic refining production. The average arsenic content of the anode copper produced by Chambishi Copper Smelter Limited is only 0. 0045%,which causes anode passivation,increased floating mud,nodulation on the top of the cathode,deterioration of the surface quality of the cathode,lower current efficiency during the electrolytic refining process. Aiming at this phenomenon,the company tracked the trend and distribution of arsenic in the copper pyrometallurgy process,analyzed and summarized the reasons for the low arsenic content of anode copper,and found the best operation for adding arsenic-copper alloy to increase the anode copper-arsenic content. That is after the blister copper fire method refining and reduction,add arsenic-copper alloy,control the nitrogen stirring flow in the furnace to 200 ~ 250 L/min,rotate the furnace repeatedly,and start casting after 15 minutes. This technical operation can not only solve the problem of low arsenic content in the copper products,but also make the arsenic content distribution in anode copper more uniform and have a higher utilization rate.