China's Sulfuric Acid Ban Just Hit Global Mining

151,000 Tons to Zero

In March 2025, China shipped 151,268 metric tons of sulfuric acid to Chile. By March 2026, that number was zero (S&P Global). On May 1, China's export ban on sulfuric acid officially took effect, formalizing what the market had already been feeling for months.

Sulfuric acid isn't glamorous. But global production exceeds 260 million metric tons annually, and roughly 60% feeds fertilizer production. The rest goes into copper extraction, nickel processing, semiconductor manufacturing, and oil refining (Supply Chain Magazine). When the world's largest exporter stops shipping, the effects ripple across continents.

What Triggered the Ban

Two factors collided. First, the ongoing U.S.-Iran conflict disrupted Middle Eastern sulfur supplies -- sulfur is a primary feedstock for sulfuric acid production. Second, China's domestic agricultural sector needs the acid for spring planting, and Beijing chose to prioritize domestic supply over exports (Bloomberg).

China's domestic sulfuric acid price nearly doubled in six weeks -- from $149 per metric ton in early March to $307 by mid-April (Supply Chain Magazine). That price signal drove the export restriction.

Who Gets Hit

• Chile's copper sector is the most exposed. Chile is the world's largest sulfuric acid importer at 4 million metric tons annually, with 37% sourced from China. Roughly 20% of Chilean copper output -- 1.1 million metric tons of refined production -- depends on acid-intensive heap leaching processes (S&P Global).
• Fertilizer producers in India and Africa face higher costs and potential shortages ahead of planting seasons. With Middle Eastern sulfur constrained and Chinese acid redirected domestically, importing regions have fewer options.
• Semiconductor and battery manufacturers that use sulfuric acid in processing face secondary supply pressure as prices rise across the board.

Why There's No Quick Fix

New sulfuric acid production capacity takes 18-24 months to permit and build. Transport costs and safety constraints make this a regional market -- you can't ship acid from anywhere (S&P Global). Chilean miners covered most of their acid needs for the first half of 2026, but left much of the second half uncovered.

Each $50/tonne increase in sulfuric acid pricing raises copper production costs between 4.4 and 26.2 cents per pound, depending on operational intensity (Fastmarkets). That cost increase flows downstream to every industry that uses copper -- which is nearly all of them.

What Operations Teams Should Do

Map your exposure now. If your supply chain touches copper, fertilizer, or semiconductor inputs, trace the acid dependency. The impact isn't limited to mining companies -- it reaches any manufacturer whose components rely on copper processing.

Build buffer stock assumptions around H2 2026. The first-half coverage that Chilean miners secured will burn off. Second-half supply gaps could tighten copper availability and push prices higher. Procurement teams should adjust lead times and sourcing assumptions accordingly.

Monitor the geopolitical drivers. The sulfuric acid ban didn't happen in isolation -- it's linked to the Iran conflict, Middle Eastern sulfur supply disruption, and China's broader export control strategy covering rare earths, tungsten, antimony, and silver. Orion tracks these geopolitical and policy risk signals in real time, giving operations teams visibility into supply chain shifts before they reach the procurement desk.

Wrapping Up

A chemical most people never think about is now a bottleneck for global copper, food, and electronics supply chains. The ban took effect May 1. The supply gap will widen through year-end. If your operations depend on any of these materials, the time to adjust is now.

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