Journal de la métallurgie des poudres et des mines

Abstrait

Sustainable Method for Recycling Nd from Old Electronic Parts with Element-specific Sorting that Makes Hydrometallurgy Easier

Delogado VA

Neodymium is a pricey strategic metal that is absolutely necessary for our society; the most important issue is to ensure its availability and ensure its sustainable use. We are far from this, however, as less than one percent of it is recycled at the moment. Despite their 12 percent share of the Nd market, recycling small Nd-containing ceramicbased components has received little attention despite some work being done to recycle electrical engine's large Nd-based magnet alloys. A method for economically viable Nd recycling from such electronic waste components is demonstrated in this paper. We handled the issue of high Nd weakening in complex e-squanders through the upstream arrangement of synchronous dismantling, machine vision, and multi-energy X-beam transmission arranging (first-of-its-sort), trailed by exact beneficiation in righteousness of the distinction in attraction, thickness,and break sturdiness. The concentrates that are produced are mostly dielectric ceramics (BaO-Nd2O3-TiO2) with 38.3% by weight of Nd. Despite the fact that earthenware production are hard-headed by and large, Nd can be just filtered in concentrated HNO3 from these dielectrics with high selectivity under upgraded conditions. Oxalate precipitation can then be used to recover Nd, and 60 percent of HNO3 can be regenerated. Through theoretical calculations, the underlying kinetics, thermodynamics, and bonding nature of the leaching were investigated to expand on the mechanism. Nd2O3 of commercial grade (> 99.6%) is produced with an overall efficiency of 91.1%.All the more critically, the reusing course is assessed beneficial in no less than four years in light of moderate edges. A promising approach to recovering rarely recycled strategic metals in the direction of a closed-loop design is presented in this work.