从不同形式钨铼合金废料中回收铼的研究

Investigation of recycling rhenium from different forms of W-Re alloyed scraps

摘要:

铼作为一种稀有难熔金属,因具有独特的性能使其应用受到重视。在铼资源不足的情况下,从含铼废料中回收铼被认为是获取铼的重要途径之一。本文选取粉末状、块状以及丝状三种不同形式的钨铼合金废料,进行火法回收铼的研究,对不同工艺参数下氧化焙烧、氨水浸出和蒸发结晶所得回收中间产物NH4ReO4和最终氢还原所得铼粉的性能进行表征。结果表明,钨铼合金废料的形式对铼的回收工艺条件和回收率有明显的影响,未合金化的钨铼合金粉末状废料及合金化后的块状和丝状废料回收时需采用不同的氧化温度,且在不同的温度下Re2O7有不同的挥发率,粉末状、块状以及丝状三种不同形式的钨铼合金废料回收所得铼粉的纯度分别为99.952%、99.939%和99.915%,铼的回收率分别为95.62%,94.57%和91.59%。

Abstract:

Rhenium is a rare refractory metal with unique characteristics and has been widely used. In the case of insufficient rhenium resources, recycling rhenium from rhenium-bearing scraps is considered to be one of the important ways to obtain rhenium. In this paper, W-Re alloyed scraps in the form of powder, block and wire were selected to recycle rhenium by a pyrometallurgical method, and the properties of the recycled intermediate NH4ReO4 obtained by oxidation roasting, ammonia leaching, evaporative crystallization and the rhenium powder obtained by hydrogen reduction under different process parameters were analyzed. The results show that the form of W-Re alloyed scraps has a significant effect on the recycling process and recovery rate of rhenium powder. The W-Re alloyed scraps in unalloyed powder form, alloyed block and alloyed wire form have different oxidation temperatures, and the volatilization rate of Re2O7 were different at different temperatures. The purity of rhenium powder recycled from three different forms of W-Re alloyed scraps in powder, block and wire were 99.952%, 99.939% and 99.915% respectively, and the recovery rate of rhenium were 95.62%, 94.57% and 91.59% respectively.