摘要
炼锌副产物是铟的主要来源之一,但在铟回收的过程中,铟易随水淬渣、含铜生铁流失,从而导致铟的回收率降低、损失增大.针对这些问题,本文提出了在锌还原熔炼回收铟的过程中加入铅富集铟从而提高铟回收率的新方法,并通过计算与实验证实了该方法的可行性.首先,基于密度泛函理论,对Pb-In-Zn团簇及熔体结构进行从头算分子动力学模拟,并通过计算其径向分布函数与扩散系数,对加铅富集铟的可行性进行分析.计算结果表明,经过动力学模拟后,In与Pb发生了明显的聚集,Pb-In间的相互作用明显大于Pb-Zn和Zn-In,且在Pb与In物质量比为3:1时Pb对In的富集效果最明显.随后依据理论结果开展Pb-In-Zn混熔实验,结果表明铅的加入明显提升了铟的回收率,且在Pb与In物质量比为3:1时铟的回收率最好,证实了计算结果的正确性.本研究为提升铟的回收率提供了切实可行的办法,为有色金属回收利用提供了新思路.
Abstract
To solve the problem of low recovery and heavy losses of indium in water-quenched slag and copper-containing pig iron in the process of reduction smelting,a new idea of adding lead into the zinc-indium system to recover indium from zinc is proposed in this paper.First,the feasibility of the mixed smelting of zinc-indium-lead is studied theoretically by means of ab initio molecular dynamics simulation and the optimal mixing ratio is obtained.Then,the theoretical calculation results are verified experimentally.The calculated results show that the interaction between Pb-In is stronger than that between Zn-In and surrounding atoms.After kinetic simulation,In and Pb aggregate together,and the effect is the most obvious when the molar ratio between lead and indium is 3:1.The miscibility experiment of the lead-indium-zinc alloy proves the correctness of the simulation results.The results of industrial experiments further verify that the recovery rate of indium is the best when molar ratio of Pb to In is 3:1.This study provides a feasible method for the recovery of indium and a new idea for the recovery and utilization of nonferrous metals.
基金项目
National Natural Science Foundation of China(51904132)
NETL
NSTL
维普
万方数据