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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%。
Taking a copper anode mud chlorinated gold after Immersion gold liquid as raw material to study the efficient recovery of selenium and tellurium reductant. First, thermodynamic analysis was performed on the reduction of valuable elements in the solution after immersion in gold. On this basis, the effects of different reducing agent systems on the recovery of selenium and tellurium in the solution of immersion gold were studied. Then, the single factor experiment was used to study the effect of hydration Hydrazine reduction system, the process conditions on the recovery of selenium and tellurium; Finally, hydrazine hydrate reduction system by adding hydroxylamine hydrochloride to strengthen the reduction of selenium and tellurium. The results show that the hydrazine hydrate has a good reduction effect on both selenium and tellurium, and the recoveries of selenium and tellurium are 71.23% and 76.50% respectively. When the hydrazine hydrate is 0.2133 mol / L, the H + concentration is 4.305 mol / L, the reaction temperature The recoveries of selenium and tellurium were 92.07% and 97.81% at 85 ° C for 5 h and 97.59% when the concentration of hydroxylamine hydrochloride was 1.5116 mol / L and the recovery rate of tellurium was 100 %.