摘要
采用铁屑粉还原高含铜酸性浸出液,以回收其中的铜,研究了pH值、温度、时间及铁屑加入量对还原效果的影响,对所生成的海绵铜进行了SE M-EDS及XRD物相分析,并通过热力学软件绘制了Cu-As-Fe-H_(2)O系φ-pH图,确定该溶液体系下物相发生的变化,研究其反应机理。实验结果表明,在反应温度为40℃,充分搅拌,时间约30 min,铁粉加入量为理论量的1.1倍,溶液pH值不调节的条件下,铜沉淀率可达到99%以上,所得到的海绵铜中As、Te杂质含量较低。海绵铜内部元素分布较均匀,其形貌以絮状物为主,少量与铁屑粉形貌类似,呈现不规则多边形,絮状物主要为铁粉与浸出液中铜离子充分反应后所生成的产物,多边形颗粒物主要由少量铜、铁、Cu_(2)O及铜砷化合物组成。海绵铜主要由FeCu_(4)、Cu_(2)O及Cu_(3)As等物相组成。
The acid leaching solution with high copper content was reduced by iron powder to recover copper.The effects of pH value,temperature,time and iron powder addition on the reduction effect were studied.The SE M-EDS and XRD phase analysis of the generated sponge copper were carried out.Theφ-pH diagram of C_(u)-A_(s)-F_(e)-H_(2)O system was drawn by thermodynamic software to study the change of phase in the solution system.The results show that when the reaction temperature is 40℃,the reaction time is about 30 min,the amount of iron powder is about 1.1 times of the theoretical amount,and the pH value of the solution is not adjusted,the copper precipitation rate can reach more than 99%,and the content of As and Te impurities in the obtained sponge copper is low.The internal elements of sponge copper are evenly distributed,and its morphology is mainly flocculent.A small amount is similar to the morphology of iron powder,showing irregular polygons.The flocculent is mainly the product of the full reaction of iron powder and copper ions in the leaching solution.The polygonal particles are mainly composed of a small amount of copper,iron,Cu_(2)O and copper arsenic compounds.Sponge copper is mainly composed of FeCu_(4),Cu_(2)O and Cu_(3)As.
作者
杨文魁
刘胜宏
曹雷斌
刘金生
鲁艺珍
YANG Wenkui;LIU Shenghong;CAO Leibin;LIU Jinsheng;LU Yizhen(Jiangxi Copper Technology Research Institute Co.,Ltd.,Nanchang 330500,China;Jiangxi Jinde Lead Industry Co.,Ltd.,Dexing 334202,China)
出处
《绿色矿冶》
2025年第4期89-94,共6页
Sustainable Mining and Metallurgy
关键词
铁屑粉
酸性浸出液
酸性废水
海绵铜
相转变
iron filings
acid leaching solution
acid waste water
sponge copper
phase transformation
