摘要
针对湿法炼锌过程中稀散金属锗的浸出,以含锗氧化锌烟尘为原料,采用常压富氧浸出技术从含锗氧化锌烟尘中回收锌和锗。氧化锌烟尘的X射线衍射(XRD)和扫描电子显微镜-能谱分析(SEM-EDS)等分析结果表明,富锗氧化锌烟尘除含有氧化锌外,还含有少量硫化锌与硫化铅,部分硫化锌与氧化锌混合形成致密颗粒。考察了铜离子浓度、时间、液固比、温度、氧压等因素对氧化锌烟尘浸出锌、锗的影响。结果表明,在常压富氧条件下,温度90℃、液固比7 mL/g时,采用两段浸出4 h,锌、锗的浸出率可超过90%;浸出渣主要物相为硫酸铅和硫化锌。采用氧化锌烟尘做中和剂对酸浸溶液进行中和还原处理,控制溶液pH值为3~3.5,反应时间1 h,可将溶液中Fe3+的浓度控制在0.02 g/L内,且该过程溶液中的锗不发生水解损失,有利于后续溶液中锗的高效分离回收。
This paper studies the atmospheric oxygen leaching of germanium and zinc from germanium-bearing zinc oxide dust in the process of zinc hydrometallurgy.The raw material is germanium-bearing zinc oxide dust,which contains zinc oxide and few zinc sulfide and lead sulfide as analyzed by X ray diffraction(XRD)and scanning electron microscopy-energy disperse spectroscopy(SEM-EDS).Some zinc sulfide is mixed with zinc oxide to form dense particles.The effects of the copper ion concentration,time,liquid-solid ratio,temperature,oxygen pressure on the leaching of zinc and germanium were studied.The results show that under the condition of atmospheric oxygen leaching,90℃of the temperature,7 mL/g of the liquid-solid ratio,and 4 h by two stages leaching,zinc and germanium leaching rate could over 90%.The main phase of residue are lead sulfate and zinc oxide.Neutralizing and reduction process was employed to deal with the leaching solution of germanium.When solution pH values was 3.0~3.5 and reaction time was 1 h,the concentration of Fe3+could reduce below 0.02 g/L,and the germanium in solution did not hydrolysis,which is beneficial to the efficient separation and recovery of germanium in the subsequent solution.
作者
邓志敢
朱应旭
魏昶
李衍林
张梅
赵文丽
李兴彬
DENG Zhi-gan;ZHU Ying-xu;WEI Chang;LI Yan-lin;ZHANG Mei;ZHAO Wen-li;LI Xing-bin(Faculty of Metallurgical and Energy Engineering, Kunming University of Science and Technology, Kunming 650093, China;Yunnan Chihong Zn&Ge Co. Ltd., Qujing 655011, Yunnan, China)
出处
《矿冶》
CAS
2020年第1期37-43,共7页
Mining And Metallurgy
基金
国家重点研发专项计划项目(2018YFC1900402)
国家自然科学基金资助项目(51804146,51564030,51664030)
关键词
锗
氧化锌烟尘
常压氧浸
中和
还原
germanium
zinc oxide dust
atmospheric oxygen leaching
neutralizing
reduction