Zambia’s Sulphuric Acid Exports to DR Congo: 2026 Crisis Explained

When a Chemical By-Product Becomes a Strategic Chokepoint

The global energy transition is routinely discussed through the lens of lithium, cobalt, and rare earth elements. Investor attention gravitates toward ore grades, mine permits, and battery chemistry. Yet one of the most consequential inputs keeping the world's copper and cobalt supply chains operational receives almost no attention until it disappears: sulphuric acid.

When Zambia imposed an outright ban on sulphuric acid exports in September 2025, the immediate reaction from global markets was muted. Nine months later, the consequences of Zambia sulphuric acid exports to DR Congo had rippled across the Central African Copperbelt in ways that are now forcing commodity analysts, mining executives, and policymakers to rethink how they map critical mineral supply chains. The lesson is uncomfortable: a chemical produced as industrial waste can, under the right conditions, become a more urgent bottleneck than the ore body itself.

The Chemistry Beneath the Copperbelt

How Sulphuric Acid Unlocks Oxide Copper and Cobalt Deposits

To understand why Zambia's sulphuric acid exports to DR Congo carry such outsized strategic weight, it helps to understand the geology driving demand for this chemical across the region.

The Central African Copperbelt sits atop one of the highest-grade copper and cobalt resource concentrations on Earth. However, a significant portion of these deposits exist as oxide ores rather than the sulphide ores that conventional smelting processes were designed to handle. Oxide ores cannot be economically processed through traditional pyrometallurgical routes. Instead, they require a hydrometallurgical approach: heap leaching, followed by solvent extraction and electrowinning, commonly referred to as the SX-EW process.

In heap leaching, crushed ore is stacked on lined pads and irrigated with a dilute sulphuric acid solution. The acid dissolves copper and cobalt minerals from the rock, creating a metal-laden solution called a pregnant leach solution (PLS). This solution then moves through solvent extraction, where the target metals are concentrated and purified before electrowinning deposits pure metal onto cathodes. The process is elegant in its efficiency but structurally rigid in one respect: it cannot function without a continuous, reliable supply of sulphuric acid.

Sulphuric acid is not a peripheral reagent in this system. It is the mechanism by which metal is liberated from rock. Without it, heap leach operations are, quite literally, inert.

Zambia as a Structural Surplus Generator

Zambia does not produce sulphuric acid as a primary industrial activity. Instead, the country generates it as an unavoidable by-product of copper smelting. During the smelting of copper sulphide concentrates, sulphur dioxide is released as a gas. Modern smelters capture this SO₂ through acid plants that convert it into sulphuric acid via the contact process. The alternative to capturing it is atmospheric emission, which carries significant environmental and regulatory consequences.

As Africa's second-largest copper producer, Zambia's smelter network produces approximately two million metric tonnes of sulphuric acid annually as a result of this process, according to reporting by Business Insider Africa. This makes Zambia not a dedicated acid manufacturer but a structurally consistent surplus generator whose output is directly tied to the operating rate of its copper smelters.

This distinction matters enormously for supply chain modelling. Zambia's acid output cannot be easily scaled up to meet export demand independently of its copper production trajectory. Furthermore, if smelter throughput falls due to energy shortages, ore grade decline, or operational disruptions, acid output contracts in lockstep. The supply is captive to the primary production process. These dynamics are increasingly relevant given broader copper supply crunch conditions playing out across global markets.

The Scale of the Zambia-DRC Acid Trade Corridor

Quantifying a Deeply Embedded Bilateral Dependency

The economic scale of Zambia sulphuric acid exports to DR Congo is substantial enough to reflect a relationship built on infrastructure, logistics, and operational integration rather than opportunistic arbitrage.

The US$58.24 million annual trade value, sourced from UN COMTRADE data, represents far more than a commodity transaction. It reflects decades of cross-border infrastructure development, established logistics networks, and pricing relationships that cannot be replicated overnight with alternative suppliers from South America, the Middle East, or Asia. Geographic proximity significantly reduces transport costs for a heavy, corrosive bulk chemical that is expensive and technically complex to ship over long distances.

Which Entities Have Received Export Authorisation

As of May 2026, Zambia's Commerce Ministry has approved limited sulphuric acid shipments to the DRC through three entities:

• Chambishi Copper Smelter: Authorised to resume exports, with shipments directed toward Chinese-operated mining entities in the DRC
• Mopani Copper Mines: Authorised to resume exports, with commodities giant Glencore identified as a downstream recipient of these shipments
• Alliswell Investment Limited: A chemical trading entity granted a specific permit for 5,000 metric tonnes, representing a discrete, volume-capped authorisation rather than an open export licence

It is critical to note that these approvals are permit-based and volume-restricted. They do not represent a full liberalisation of sulphuric acid trade. Each shipment operates within a controlled framework designed to ensure Zambia's domestic mining sector retains priority access to the chemical before surplus volumes are released for export.

Three Simultaneous Shocks: How the Crisis Was Built

A Timeline of Escalating Supply Pressure

The export restrictions Zambia eventually imposed did not emerge from a single policy decision. They were the cumulative result of three overlapping supply shocks that converged across a period of approximately 18 months:

1. Middle East geopolitical disruption

Escalating tensions in the Middle East disrupted global sulphur shipping routes. Sulphur is the primary feedstock from which sulphuric acid is produced at dedicated acid plants globally. Restricted shipping access through strategic maritime corridors tightened feedstock availability and drove up input costs for acid producers worldwide.

2. China's export restrictions

China ranks among the world's largest exporters of sulphuric acid. When Chinese authorities moved to restrict outbound acid shipments to protect domestic industrial supply chains, a key alternative source for African mining operations was effectively removed from the market. For DRC miners already managing Zambian supply uncertainty, this elimination of a fallback source dramatically narrowed their options.

3. Zambia's domestic ban

In September 2025, facing declining domestic acid inventories that threatened Zambia's own copper producers, the government imposed an outright export ban. Combined with the two preceding external pressures, this created a triple-constraint environment across the Copperbelt that had no precedent in recent mining history.

The period between September 2025 and March 2026 represented the most acute acid supply constraint the Central African Copperbelt had experienced in over a decade, with no single shock sufficient to explain the severity and no easy single solution available.

From Blanket Ban to Permit-Based System

By March 2026, Zambia's position evolved from a blanket prohibition to a permit-based export framework, allowing small, controlled volumes to cross the border under specific authorisations. By May 2026, Zambia's Commerce Ministry confirmed that domestic stockpiles had recovered sufficiently to permit the Chambishi and Mopani approvals.

Commerce Minister Chipoka Mulenga publicly confirmed that Zambia had cleared the two major copper producers to restart shipments once local inventories had stabilised, and indicated that expanded export approvals could follow if domestic supply conditions continue to improve, as reported by Business Insider Africa. This framing positions the resumption as inventory-conditional, not a permanent policy reversal.

Production Consequences Across the Copperbelt

Rationing, Curtailments, and Operational Stress

The impact of the acid shortage on DRC mining operations during the restriction period was tangible and operationally significant. According to Business Insider Africa, multiple copper and cobalt producers in the DRC were compelled to reduce their chemical consumption rates and evaluate output curtailments during the period of peak supply constraint. Some operations had shipments from international suppliers cancelled or delayed, compounding the gap left by Zambia's domestic ban.

In practical terms, acid rationing at a heap leach operation means reducing the irrigation rate across the ore pads, which directly lowers the rate of metal dissolution and extends the time required to recover a given quantity of metal. This reduces throughput without necessarily stopping production entirely, but the cumulative effect on quarterly and annual output figures is material. These pressures, furthermore, are directly relevant when assessing global cobalt production trajectories heading into the latter part of this decade.

The Kamoa-Kakula Example: Vertical Integration as Resilience

One operation that demonstrated relative resilience during the shortage period was Ivanhoe Mines' Kamoa-Kakula copper complex in the DRC. Because Kamoa-Kakula operates its own smelter, it generates sulphuric acid internally as a by-product of its own processing operations. Reporting from Bankable Africa indicates the operation generated and sold significant acid volumes in Q1 2026, providing some internal market relief. However, the scale of Kamoa-Kakula's acid output, while commercially meaningful, was insufficient to offset the broader regional deficit created by the convergence of supply shocks.

This case illustrates an important structural dynamic: vertically integrated operations that control their own processing infrastructure carry a form of supply chain resilience that pure leaching operations cannot replicate without capital-intensive long-term investment.

Why Domestic DRC Production Cannot Bridge the Gap

The DRC's own domestic sulphuric acid production capacity remains structurally inadequate relative to the scale of its leaching-dependent mining sector. Developing meaningful new acid production capacity requires smelter construction or dedicated sulphur-burning acid plant investment, with capital and construction timelines measured in years rather than months. There is no short-term pathway for the DRC to self-supply its way out of Zambian acid dependency, which is precisely why the bilateral trade corridor carries strategic weight that goes beyond its dollar value.

Goldman Sachs, Fertilisers, and the Widening Strategic Frame

When an Investment Bank Flags an Industrial Chemical as a Systemic Risk

The elevation of sulphuric acid from an operational line item to a strategic commodity is perhaps best illustrated by the fact that Goldman Sachs formally warned that prolonged acid shortages pose a direct threat to global copper production, with the DRC and Chile identified as the most exposed jurisdictions, according to Business Insider Africa. Both regions depend heavily on leaching-based extraction methods, meaning both are structurally vulnerable to acid supply constraints in ways that smelting-dominated producers are not.

The analytical framing that Goldman Sachs applied mirrors the lens applied to lithium, cobalt, and rare earths over the past decade: that supply chain risk is not simply about accessing an ore body, but about securing every input required to convert that ore into a usable product. This perspective aligns closely with emerging discussions around critical minerals energy security as a policy and investment priority.

The Fertiliser Competition: Dual Demand Pressure

A dimension of the sulphuric acid market that receives insufficient attention in mining-focused analysis is the chemical's parallel role as a critical input in phosphate fertiliser production. The wet process for manufacturing phosphoric acid, which underpins the global fertiliser industry, consumes sulphuric acid in large quantities. As food security concerns intensify alongside accelerating energy transition demand, sulphuric acid faces simultaneous demand pressure from two structurally different and economically powerful sectors.

This dual-demand dynamic fundamentally changes the supply-demand calculus. In previous decades, sulphuric acid was often treated as a waste management problem by smelter operators who needed to dispose of excess production. Today, the same chemical is being competed for by battery mineral miners and fertiliser manufacturers, with geopolitical supply disruptions amplifying the tension between these competing users.

The consequence is a structural reduction in the likelihood of sustained price relief, and an increased probability that any future supply shock will have faster and more severe operational consequences than historical precedent would suggest.

Is the Resumption a Fix or a Pause?

Scenario Modelling: Three Possible Forward Trajectories

The conditional nature of Zambia's export resumption means the current situation should be read as a pause in the crisis rather than a resolution of it. Three distinct forward trajectories are plausible:

The structural diversification scenario is theoretically achievable but practically constrained by capital requirements and development timelines. It is a multi-year project, not a near-term response mechanism. In the interim, the Zambia-DRC acid corridor remains the dominant supply pathway, and its vulnerability to domestic Zambian conditions is a persistent risk factor for any investor with exposure to DRC copper or cobalt production.

What Could Trigger a Reversal?

Several conditions could reverse Zambia's current position and trigger renewed export restrictions:

• A decline in Zambia's domestic smelter throughput due to energy shortages, which have historically been a recurring operational risk in the country
• Deterioration in Zambia's domestic copper ore grades, which would reduce acid by-product volumes from smelting operations
• A new surge in domestic mining activity that increases internal acid consumption beyond current inventory buffers
• A repeat of global sulphur supply disruptions that tighten the feedstock available to Zambian smelters

None of these scenarios are remote. Several reflect structural features of Zambia's mining and energy landscape that have materialised repeatedly over the past two decades. Consequently, copper investment trends must increasingly account for these upstream chemical dependencies as part of any credible risk framework.

Battery Minerals, EVs, and Why This Trade Route Is a Global Issue

The DRC's Position in the Energy Transition Supply Chain

The DRC's importance to the global energy transition cannot be overstated. The country accounts for approximately 70% of global cobalt supply, a mineral that remains a key cathode component in NMC (nickel manganese cobalt) lithium-ion battery chemistries widely used in electric vehicles. The DRC is simultaneously the world's second-largest copper producer, and copper's role in EV motors, charging infrastructure, and grid-scale storage systems makes it arguably the most important industrial metal in the clean energy build-out.

Any disruption to DRC mining output therefore creates an immediate upstream pressure on battery manufacturers and EV producers globally. The acid supply chain is not a peripheral operational detail. It is a direct chokepoint in the pathway between mineral resource and finished battery cell. These dynamics exemplify the broader strategic supply bottlenecks that are reshaping how nations and corporations approach resource security planning.

The Underappreciated Geography of Chemical Logistics

One aspect of this supply chain that rarely receives analytical attention is the logistical reality of moving sulphuric acid across Central Africa. The chemical is classified as a dangerous good, requires specialised tanker trucks or rail cars with acid-resistant linings, and poses significant handling risks at border crossings and transfer points.

The established logistics infrastructure between Zambia's Copperbelt Province and the DRC's Katanga Province has been built up over decades of bilateral trade. Replicating this infrastructure to accommodate alternative supply sources from Chile, the Middle East, or East Asia would require investment in road, rail, and port handling capacity that does not currently exist at the necessary scale.

This logistical reality creates a form of geographic dependency that is nearly as binding as the economic one. Even if alternative acid sources were price-competitive, the physical infrastructure required to deliver them to inland DRC mining operations at the required volumes does not exist in a form that can be activated quickly.

Frequently Asked Questions: Zambia Sulphuric Acid Exports to DR Congo

Why did Zambia ban sulphuric acid exports to the DRC?

Zambia imposed export restrictions in September 2025 after domestic acid inventories fell to levels that threatened the operational continuity of Zambia's own copper producers. The government prioritised domestic supply security before allowing cross-border shipments to resume under a permit-based system introduced in March 2026.

How much sulphuric acid does Zambia export to the DRC annually?

UN COMTRADE data indicates Zambia exported US$58.24 million worth of sulphuric acid and oleum to the DRC in 2024, reflecting the economic scale and strategic depth of this bilateral trade relationship, as reported by Business Insider Africa.

Which Zambian entities are authorised to export sulphuric acid to the DRC?

As of May 2026, Chambishi Copper Smelter, Mopani Copper Mines, and chemical trader Alliswell Investment Limited (authorised for 5,000 metric tonnes) have received government approval for limited shipments under the permit-based framework.

Why is sulphuric acid critical for copper and cobalt mining?

Sulphuric acid is the primary reagent in heap leaching and SX-EW processing, the dominant extraction method for oxide copper and cobalt ores across the Central African Copperbelt. Without consistent acid supply, these operations cannot convert ore into saleable metal.

Could the DRC develop its own sulphuric acid supply?

While operations like Kamoa-Kakula generate acid internally from smelting by-products, the DRC's overall domestic production capacity is materially insufficient relative to industry-wide leaching demand. New capacity development would require multi-year capital investment cycles and cannot serve as a near-term solution.

What is the connection between sulphuric acid and electric vehicles?

Sulphuric acid enables the extraction of copper and cobalt, two minerals foundational to EV motors, battery cathodes, and charging infrastructure. Supply disruptions to acid therefore cascade directly into upstream battery manufacturing timelines and, ultimately, EV production costs.

Key Takeaways: Reading the Copperbelt's Chemical Signal

The Zambia-DRC sulphuric acid story encodes a broader set of lessons about how the global energy transition is actually constrained at ground level:

• Sulphuric acid has transitioned from an industrial surplus to a strategically contested commodity whose disruption directly impairs copper and cobalt output at scale
• The US$58.24 million annual trade corridor between Zambia and the DRC has no viable short-term alternative routing, and its vulnerability is structural rather than episodic
• Zambia sulphuric acid exports to DR Congo remain cautious, conditional, and volume-capped, providing temporary relief without resolving the underlying supply chain fragility
• Goldman Sachs' warning about copper production risk signals that institutional capital is beginning to price acid supply risk into its critical mineral analysis frameworks
• The dual demand pressure from both battery mineral extraction and phosphate fertiliser production means sulphuric acid price relief is unlikely to be sustained without significant new supply capacity coming online globally
• Investors and supply chain strategists tracking copper and cobalt output should monitor sulphuric acid availability as a leading indicator of production risk, sitting upstream of the production data itself

This article is intended for informational purposes only and does not constitute financial or investment advice. Forward-looking scenarios and market projections involve inherent uncertainty and should not be relied upon as predictions of future outcomes. Readers should conduct independent research and consult qualified financial advisers before making investment decisions.

Want to Stay Ahead of the Next Critical Mineral Supply Shock?

Discovery Alert's proprietary Discovery IQ model scans ASX announcements in real time, delivering instant alerts on significant mineral discoveries — including copper and cobalt plays directly exposed to the supply chain dynamics reshaping the Copperbelt — so subscribers can act before the broader market catches on. Explore how historic discoveries have generated extraordinary returns on Discovery Alert's dedicated discoveries page, and begin your 14-day free trial today to position yourself ahead of the next major market move.