As global demand for critical rare earths, battery materials, and semiconductors surges, end-of-life waste is quickly transforming into a strategic goldmine of critical materials. With IDTechEx forecasting that over US$66B of critical material value will be recovered from waste annually by 2046, IDTechEx evaluates hydrometallurgy, pyrometallurgy, and other emerging recycling technologies for critical material recovery.
As semiconductor, rare earth, and Li-ion battery demand grows, end-of-life waste is quickly becoming a strategic, and increasingly valuable, source of critical materials. Intensifying global trade disputes and export restrictions placed on strategic material supply are creating a strong market pull for technologies enabling critical material recovery from waste. With growing public and private investment flowing into critical material markets, IDTechEx forecasts that US$66B of critical materials will be recovered from waste annually by 2046.
The push to reshore critical material supply globally is driving strong demand for critical material recovery technology that can be deployed at scale, fast. Critical material recovery technology must also be capable of processing a broad gamut of emerging secondary feedstock and waste sources, including manufacturing scrap, batteries, electronics waste, magnets, and photovoltaics. IDTechEx's latest report, 'Critical Material Recovery 2026-2046: Technologies, Markets, Players', comprehensively evaluates emerging critical material recycling technology, including pyrometallurgy, hydrometallurgy, direct recycling, ionic liquids and more.
The critical material recovery market is forecast to exceed US$66B by 2036. Source: IDTechEx.
Emerging critical material recovery technologies must be versatile and scalable
Pyrometallurgy and hydrometallurgy are the most mature critical material recovery technologies and are best positioned to adapt to recycling as waste streams come online.
Pyrometallurgy uses high temperature melting to recover valuable and critical metals from solid mixtures and is the dominant technology employed for precious and platinum group metal recovery in automotive and e-waste recycling. In 2025, market leading refiners, including Umicore, DOWA, Johnson Matthey, and Tanaka Precious Metals, operate large smelting plants across Asia, Europe and North America, capable of accepting recycled materials.
High energy usage and high OpEx costs are key challenges for pyrometallurgy, exposing the profitability of recycling to fluctuations in global metal prices. As such, pyrometallurgy can be poorly suited to critical material recovery when prices are volatile and metal value in secondary feedstocks are low.
Hydrometallurgy is commonly employed following pyrometallurgical processing to extract metals into liquid solutions for recovery. Hydrometallurgy uses combinations of selective leaching, solvent extraction, chromatography, and precipitation to recover high purity critical metal salts (>99.5%) from waste. Hydrometallurgy is relatively feedstock agnostic and applicable to a broad range of critical metal chemistries, such as lithium, nickel, and cobalt from batteries, and rare earth elements from neodymium magnets.
Critical material recovery technology performance benchmarking and development trends. Source: IDTechEx.
Despite high chemical usage and OpEx costs, hydrometallurgy technologies are increasingly popular for critical material recycling from emerging secondary sources. Separated metal salt products can be sold into many material market verticals, enabling processors to dynamically service changing downstream demand. Moreover, the economics of many hydrometallurgical processes are favored by higher volume material flows, incentivizing processors to supplement primary mineral feedstock with recycled waste where possible.
Hydrometallurgy technology will play a central role in growing lithium-ion battery recycling and critical rare earth recovery markets. IDTechEx expects hydrometallurgical Li-ion battery recycling capacities to grow at a faster rate than pyrometallurgy and be responsible for a growing proportion of global battery recycling capacity. Rare earth recycling is also set to benefit from an expansion in hydrometallurgical solvent extraction capacity across Europe and the US, with MP Materials, Solvay, and Carester collectively set to add 25 ktpa of separation capacity by 2030.
Direct recycling technology emerging for rare earth magnets and Li-ion batteries
Direct critical material recycling technology is attractive as it can (in theory) recover the highest value material at the lowest overall cost. But in reality, direct recycling technologies are highly material specific and have limited applicability for complex waste streams.
Nevertheless, when critical material demand in highly consolidated in specific applications - such as rare earth magnets and Li-ion batteries - and well-defined waste streams are attainable, direct recycling technologies are emerging.
Hydrogen decrepitation is an emerging critical material recycling technology that demagnetizes and powderizes neodymium magnets into mixed alloys. Hydrogen decrepitation offers a compelling alterative to capital and chemical intensive solvent extraction technology, recovering high value rare earth magnet alloys for remanufacturing. IDTechEx estimates that approximately 110 tonnes of NdFeB magnets will be recycled by hydrogen decrepitation in 2025, substantially less than the expected ~3,800 tonnes recycled by solvent extraction. This disparity is attributed the lower TRL, recycling capacity, and number players (notably HyProMag and Noveon Magnetics) employing hydrogen decrepitation technology in 2025.
Direct Li-ion battery recycling methods such as cathode re-lithiation involve reactivating battery materials to recover capacity lost during cycling. Direct battery recycling technologies may offer a cheaper alternative for regenerating LIB cathodes than hydro- and pyrometallurgy processing. A key challenge facing direct battery recycling is that cathodes must be upcycled to meet new market demand, and the performance of re-lithiated cathodes is not well demonstrated over extended cycling yet.
Future critical material recovery technologies focus on sustainability
Future critical material recovery technologies all share one theme: circularity. Reusable ionic liquid and supercritical fluid solvents, electrochemical and biometallurgy technologies all focus on reducing chemical and energy usage, and thus minimizing operating costs.
Ionic liquids are highly polar solvents capable of easily dissolving metal ions in solution, with applications in toxic metal removal in water treatment, desulfurization of fuels, and as battery electrolytes. Ionic liquids are increasingly being developed as reusable solvents for critical material extraction, particularly for e-waste and battery recycling applications.
Overview of ionic liquids for critical material extraction from waste. Source: IDTechEx.
Biometallurgy, which employs microorganisms to dissolve metals in solution, is a critical material recycling technology on the bleeding edge. Biometallurgical processing is increasingly being explored for primary extraction in mining applications, in particular for the beneficiation of tailings and concentrates. However, application of biometallurgical processes on secondary sources remains in the early stages of research, with most development focusing on precious metal recovery from e-waste.
Critical material recovery market outlook
Pyro- and hydrometallurgy technologies pioneered in primary mining industries will be crucial for critical material recovery from waste. IDTechEx forecasts that over 8,150 ktonnes of critical materials will be recovered from waste per year globally by 2046. Li-ion battery recycling and rare earth magnet recovery represent the highest growth opportunities, as the overall critical material recovery market value is set to grow at a 9.2% CAGR over the next two decades.
For full technology analysis and benchmarking, key player mapping, and granular critical material recovery market forecasts, see IDTechEx's latest research report: 'Critical Material Recovery 2026-2046: Technologies, Markets, Players'.
For more information on this report, including downloadable sample pages, please visit www.IDTechEx.com/CriticalMaterials, or for the full portfolio of related research available from IDTechEx, see www.IDTechEx.com/Research/AM.
