Decarbonisation

Hydrogen processing of magnetic scrap (HPMS) is a promising short-loop route for recycling end-of-life NdFeB permanent magnets; however, the resulting hydrogenated powder requires vacuum degassing before reuse. This study defines a phenomenological degassing window for HPMS jet-milled powder from end-of-life wind-turbine magnets by screening degassing temperature (650–900 °C), heating rate (1–3 °C/min), and dwell time (5–60 min) under vacuum. Pressure–temperature…

The development of sustainable metallurgical routes aimed at reducing CO 2 emissions has renewed interest in alternative reductants for alloy production. Secondary aluminium, due to its strong reducing potential and high reaction enthalpy, represents a promising candidate for aluminothermic processing. The choice of reductant plays a critical role in governing the microstructure and physicochemical properties of the resulting alloy. In…

Platinum group metals (PGMs) are key components of automotive emission-control catalysts, and spent automotive catalysts (SACs) are their main secondary source. This paper reviews hydrometallurgical, pyrometallurgical, magnetic-separation, biometallurgical, and ionic-liquid/deep-eutectic-solvent (IL/DES) routes and compares them for recovery, selectivity, energy demand, reagent hazard, technology readiness, and scalability, using values re-checked against accessible primary sources. Smelting with Cu- or Fe-based collectors is…

A reassessment of published HPSR energy balances, arguing that several cited figures omit auxiliary loads. The authors welcome counter-data.

Charging direct reduced iron (DRI) into a blast furnace alters the softening–melting–dripping behavior of mixed burdens; however, the influencing laws and mechanisms remain unclear. In this study, DRI, pellets, and sinter were used as raw materials to systematically investigate the effect of DRI proportion (0–40%) on the softening–melting–dripping behavior of mixed burdens, and the underlying mechanism was revealed by combining…

Kinetic understanding of the hydrogen co-reduction of multinary and multi-phase oxides is of interest for enhancing sustainability of alloy production and transition to a hydrogen-based economy. Benefits include decrease in energy consumption, enhanced kinetics, conversion of oxides to alloys in a single step, and opportunities to create microstructures that are hard to realize by other processes. Thin films provide a…

The utilization of mineral carbon sequestration technology has emerged as a promising approach for mitigating CO2 emissions in recent years. This study aimed to assess the carbon sequestration potential of mineral tailings across the administrative divisions of Sichuan Province, including prefectures and cities. The approach outlined in the IPCC Guidelines for National Greenhouse Gas Inventories and an enhanced version of…