Selection of reductants for extracting selenium and tellurium from degoldized solution of copper anode slimes

沉金后液回收硒、碲还原剂的选择（英文）

This paper focused on investigating high-efficient reductants of recovering selenium and tellurium from degoldizedsolution of copper anode slimes.Firstly,the effect of various reductants on recovery rates of Se and Te was investigated based onthermodynamic analysis of various metallic ions in degoldized solution.Secondly,the single factor experiments were made toinvestigate the effect of the process parameters on recovering Se and Te with hydrazine hydrate.Finally,the hydroxylaminehydrochloride was added to intensify the extraction efficiencies of Se and Te.The results indicated that hydrazine hydrate was themost suitable reductant,and the recovery rates of Se and Te are71.23%and76.50%,respectively;the recovery rates of Se and Tewere92.07%and97.81%,respectively,under the optimal process conditions of hydrazine hydrate dosage of0.2133mol/L,H+concentration of4.305mol/L,reaction temperature of85°C and reaction time of5h;the recovery rate of Se was97.59%,and that Tereached up to100%when hydroxylamine hydrochloride dosage was1.5116mol/L.

以某铜阳极泥氯化分金后的沉金后液为原料,研究能从中高效回收硒和碲的还原剂。首先,对沉金后液中有价元素的还原反应进行了热力学分析,在此基础上研究不同还原剂体系对沉金后液中硒和碲回收率的影响;然后,采用单因素实验研究水合肼还原体系中,各工艺条件对硒和碲回收率的影响;最后,在水合肼还原体系中加入盐酸羟胺来强化对硒和碲的还原效果。结果表明,水合肼对硒和碲均有良好的还原效果,硒和碲的回收率分别为71.23%和76.50%;在水合肼用量为0.2133 mol/L、H+浓度为4.305 mol/L、反应温度为85°C、还原时间为5 h条件下,硒和碲的回收率分别达到92.07%和97.81%;当盐酸羟胺浓度为1.5116mol/L时,硒回收率为97.59%,碲回收率达到100%。