As a core vital raw material for manganese hydrometallurgy, sulfuric acid dominates production costs and process selection across the entire product chain. Major manganese products, including electrolytic manganese, diversified manganese sulfate, and electrolytic manganese dioxide (EMD), adopt distinct production processes with varied acid consumption structures.

In the manganese-based hydrometallurgy industry chain, sulphuric acid is not merely an ordinary auxiliary material, but rather a core lifeline raw material that runs through the production of all product categories, controls production costs, and influences process selection. Mainstream products such as EMM, various grades of manganese sulphate, and EMD differ vastly in production processes and have entirely distinct acid consumption structures, which also leads to completely stratified sensitivities of various manganese products to sulphuric acid price fluctuations. Every round of change in acid prices transmits from top to bottom, directly reshaping the cost structure and market dynamics of the manganese industry chain.

On March 26, the Yulin Ecological Environment Bureau released the proposed approval public notice for the environmental impact report of the "Guangxi Huayou Lithium Industry Co., Ltd. Additional 50,000 t/a Lithium Carbonate Technical Transformation Project." The project uses lithium sulfate crystals and soda ash as raw materials to build an additional 50,000 t/a lithium carbonate technical transformation project. It covers an area of approximately 45,500 m². The total investment is 12.1 million yuan, of which 6.05 million yuan is for environmental protection.

As a niche yet high-strategic rare metal, hafnium (Hf, atomic number 72) lags behind common metals like copper in public awareness, but its unique physicochemical properties make it irreplaceable for nuclear power, aerospace, semiconductors and other high-end fields. This concise breakdown covers its core traits, supply dynamics and critical applications to highlight its underrecognized role in advanced manufacturing. I. Core Properties A silver-gray, high-melting-point transition metal, hafnium exists solely as a zirconium-associated metal—no independent ore deposits. The near-identical atomic radius and chemical properties of zirconium and hafnium make separation/purification highly challenging, the root of its scarcity.Key strengths for harsh industrial use: 2233℃ melting point, exceptional high-temperature oxidation/structural stability Strong room-temperature plasticity, balanced strength and toughness Superior corrosion resistance (insoluble in dilute acids/alkalis, soluble only in hydrofluoric acid/aqua regia) ~600x higher thermal neutron absorption than zirconium (ideal for nuclear reactor control) High dielectric constant of hafnium oxide (critical for advanced semiconductors) Carbides/nitrides (melting point >2900℃) for ultra-high-temperature ceramics and hard alloys II. Supply & Scarcity Resources: Extremely scarce (crustal abundance ~3 ppm), exclusively tied to zirconium ores. Global resources concentrated in Australia, South Africa, the U.S. and Brazil; China faces low hafnium content in domestic zirconium ores, leading to high external dependence. Supply: Production hinges on zirconium smelting, with zirconium-hafnium separation as a core technical barrier. Only a handful of global players produce high-purity (nuclear/electronic-grade) hafnium at scale, forming an oligopoly. Annual output is ~hundreds of tons, with ultra-low supply elasticity—supply disruptions trigger sharp price swings. Ⅲ. Irreplaceable Core Applications Demand is rigid (no cost-effective substitutes) across high-end sectors: Nuclear Industry: Preferred material for pressurized water reactor control rods, regulating reaction rates and ensuring safety. Driven by global nuclear power revival, demand is steadily growing. Aerospace: Key nickel-based single-crystal superalloy additive, boosting high-temperature creep strength and lifespan for aero-engine turbine blades, combustors and rocket nozzles. Semiconductors: High-purity electronic-grade hafnium oxide overcomes silicon dioxide’s miniaturization limits, reducing leakage current and enabling advanced-node chip production—a key growth driver. Other High-End Fields: Used in cutting tool coatings, special electronic components, corrosion-resistant materials and emerging hydrogen storage research, with expanding use cases. Ⅳ. Conclusion Hafnium is a "scarce niche metal with rigid high-end demand," holding irreplaceable strategic value in China’s key industries (nuclear power, aerospace, semiconductors). The global market remains in long-term tight supply-demand balance, and its strategic and market value will rise alongside global advanced manufacturing upgrades.

On Feb 24, 2026, China placed 20 Japanese firms, including Subaru, on an export control watchlist for unverifiable end-use of dual-use items. This signals tighter controls on critical minerals and tech amid geopolitical and supply chain shifts. The analysis examines the firms' supply chain roles and the long-term industrial implications.

On February 24, 2026, China's Ministry of Commerce issued Announcement No. 12 of 2026, adding 20 Japanese entities, including Subaru Corporation, to the export control "watch list" on the grounds of "inability to verify the end-users and end-uses of dual-use items." This move marks the first time since January 2026 that China has explicitly implemented such list-based management measures targeting Japanese enterprises, signaling a shift toward more precise, systematic, and in-depth development of export controls in the fields of critical minerals and high-tech materials. This article will conduct an in-depth analysis of the core backgrounds of these 20 enterprises, reveal their deep-seated connections with supply chains of critical materials such as rare earths, and explore the potential impact of this measure on the future global industrial landscape.