China Sulfur Prices Rise 5% Amid Hormuz Closure—Validates Phosphoric Acid Production Constraint Independent of Rock Phosphate Availability, Supports Morocco Integrated Advantage

China domestic sulfur prices increased 5% in early March 2026 as the world's largest sulfur importer faces supply disruption from Strait of Hormuz blockade trapping an estimated 44% of global sulfur exports, according to commodity market analysis published March 15. The sulfur price increase validates a critical secondary constraint on phosphoric acid production—where sulfuric acid shortage limits DAP/MAP manufacturing capacity even when rock phosphate remains available—creating a dynamic that reinforces Morocco OCP's integrated production advantage and explains sustained global fertilizer price inflation beyond rock phosphate monopoly pricing alone. China imports 8-12 million tonnes sulfur annually (world's largest importer) to supply domestic phosphoric acid production, chemical manufacturing, and metallurgical industries. The 5% price increase from baseline ~¥800-900/tonne ($110-125/tonne) to current ~¥840-945/tonne ($115-131/tonne) reflects tightening supply as Gulf sulfur exports—primarily Saudi Arabia, UAE, Kuwait, Qatar producing 15-20 MT/year as petroleum refining byproduct—remain trapped behind Hormuz blockade. The sulfur shortage creates independent constraint on phosphate fertilizer production via phosphoric acid wet process chemistry: **Wet Process Fundamentals:** 3 Ca₃(PO₄)₂ + 10 H₂SO₄ → 6 H₃PO₄ + 10 CaSO₄ + 2 HF Each tonne of phosphoric acid (54% P₂O₅ merchant grade basis) requires approximately: - 2.5-3.0 tonnes sulfuric acid (98% basis) - Equivalent to 0.8-1.0 tonnes elemental sulfur feedstock **DAP/MAP Production Impact:** DAP (18-46-0, 46% P₂O₅) production requires ~0.65-0.75 tonnes phosphoric acid per tonne DAP, equivalent to: - 1.6-2.3 tonnes sulfuric acid per tonne DAP - 0.52-0.75 tonnes elemental sulfur per tonne DAP Global DAP/MAP production ~60-70 MT/year requires 31-53 MT sulfur annually just for phosphoric acid component. With 44% of global sulfur exports (estimated 6-8 MT seaborne trade) blocked via Hormuz, phosphoric acid producers face acute sulfur sourcing pressure regardless of rock phosphate availability. This explains the counterintuitive market dynamic where Morocco rock phosphate exports continue at 30-35 MT/year capacity but global DAP/MAP supply remains constrained: **Non-Integrated Producers Squeezed:** Fertilizer manufacturers dependent on merchant phosphoric acid purchases or third-party sulfuric acid supply face dual input cost inflation: - Rock phosphate: Morocco monopoly pricing $240-260/t FOB 70-72 BPL (+11-20% vs Q2 2025) - Sulfuric acid: Sulfur shortage cascade (Gulf 15-20 MT trapped, China +5%, fragmentary reports suggest sulfur $400-600/t vs pre-crisis $100-150/t) Combined input cost increases compound DAP production economics, forcing production curtailments or finished fertilizer price increases (New Orleans $680/ton DAP reflects this cascade). **Morocco OCP Integrated Advantage:** OCP operates vertically integrated production: rock mining → sulfur imports → sulfuric acid plants (Jorf Lasfar, Safi complexes) → phosphoric acid → DAP/MAP manufacturing. This integration provides: 1. **Sulfur Procurement Priority:** OCP secures sulfur from alternative sources (Canada 8-10 MT/year, Russia 6-8 MT sanctions-complicated, US Gulf Coast 3-4 MT, Kazakhstan/Central Asia 3-4 MT) via long-term contracts and spot purchases 2. **Internal Allocation Optimization:** OCP can prioritize sulfur/acid to internal DAP/MAP production vs selling merchant rock phosphate to third parties, capturing integrated margin across value chain 3. **Production Flexibility:** Reduce rock exports to conserve sulfur for higher-value finished DAP/MAP (margin $150-200/t integrated vs $50-80/t rock-only) The China sulfur +5% data validates this integrated advantage as structural rather than temporary. China phosphate producers—despite holding substantial domestic rock phosphate reserves (80-85 MT/year production)—face phosphoric acid production constraints from sulfur shortage, limiting DAP/MAP output and explaining China phosphate export curtailment (5-8 MT/year offline, officially attributed to LFP battery priority but sulfur shortage contributes). For global phosphate markets, sulfur shortage creates pricing floor effect: - Morocco rock $240-260/t FOB supported not just by monopoly position but by downstream acid/fertilizer margins validating input cost - Demand destruction (Germany -7.7% grain harvest) counterbalanced by production constraints (sulfur limits non-integrated DAP output) - Phosphoric acid CFR India estimated $1,500-2,000/t P₂O₅ Q2 2026 (vs Q2 2025 $1,153) reflects sulfur component inflation Monitoring priorities: (1) Alternative sulfur source pricing (Canada/Russia/Kazakhstan export data), (2) China sulfur import volumes March-April 2026, (3) Phosphoric acid spot pricing (India CFR, Tampa CFR benchmarks), (4) Morocco OCP sulfur import sourcing strategy, (5) Non-integrated DAP producer production rates (capacity utilization as sulfur availability indicator).