|About this Abstract
||2018 TMS Annual Meeting & Exhibition
||Deriving Value from Challenging Waste Streams: Recycling and Sustainability Joint Session
||An Eco-friendly Extraction Method for Recovery of Valuable Metals from Spent Ni-W/Al2O3-SiO2 Catalysts
||Wenqiang Wang, Shengming Xu
|On-Site Speaker (Planned)
Metal recovery methods is the only option for handling of spent hydroprocessing catalysts which have been classified as hazardous wastes. The present study aims to develop an eco-friendly extraction method especially for rare metal tungsten from spent hydroprocessing Ni-W/Al2O3-SiO2 catalyst. Phosphoric acid was employed as the leaching reagent for the extraction of valuable metals such as W, Ni, and Co. The leaching efficiency of H3PO4 is great especially for W during to its complexing ability to form phosphotungstic acid for which 1 molar phosphor could complex 12 molar tungsten generating H3PW12O40. Then as an anion ion, tungsten was easily separated from other metal ions acting as cation ion using a solvent extraction method. This work offers a new metal recovery approach through a low-cost and environmentally-friendly way.