Rising Possibility of Production Cuts Among Chinese Zinc Smelters over Historically Low TCs

Why It Matters

The weakening of Chinese zinc smelting margins threatens global zinc supply, potentially nudging prices higher, while underscoring the tight link between zinc and sulfuric acid markets.

Key Takeaways

• Zinc concentrate TC hit record low $70‑30 per tonne.
• Smelters' profits eroding; some operating below capacity.
• Sulfuric acid byproduct offsets losses, price ~ $207/tonne.
• Unclear ceiling price may limit acid revenue support.
• Potential output cuts expected during summer maintenance.

Pulse Analysis

The treatment‑charge (TC) market, a key cost component for zinc smelters, has collapsed as Chinese spot concentrate prices slumped from $133‑163 per tonne in April to under $15 per tonne in May. This steep discount reflects a tightening domestic concentrate supply and unfavorable import arbitrage, leaving smelters with limited access to overseas material. The resulting TC levels, now hovering near $70‑30 per tonne, are the lowest on record and have squeezed profit margins across the sector.

Chinese producers are feeling the pressure unevenly. Larger smelters can still cover part of the shortfall thanks to high sulfuric acid prices—around $207 per tonne—generated as a by‑product of zinc refining. However, the government‑imposed ceiling of 1,406 yuan per tonne for acid sales to fertilizer plants is only loosely enforced, creating revenue uncertainty. Smaller, cost‑sensitive plants, especially in Shaanxi, have already scaled back output, operating well below capacity, while many others are barely breaking even or posting losses for May.

The broader market implications are significant. Any sustained reduction in Chinese zinc output—currently the world’s largest producer—could tighten global supply and support higher zinc prices, affecting downstream industries from construction to automotive. Moreover, the intertwined fate of zinc and sulfuric acid markets highlights how policy and geopolitical factors, such as Middle‑East shipping disruptions, can ripple through commodity pricing. Stakeholders should monitor TC trends, acid price stability, and potential production curtailments as key signals for the zinc market’s near‑term trajectory.