Phosphoric Acid Manufacturing Plant Project Report (DPR) 2026

What is phosphoric acid?

Phosphoric acid (H3PO4) is a mineral acid made mostly from phosphate rock and traded on its phosphorus pentoxide (P2O5) content rather than its gross weight. Merchant-grade acid, the bulk of world output, is a dark green to brown liquid at 52–54% P2O5. Superphosphoric acid carries 68–72% P2O5 and feeds liquid fertilizers, while purified grades at 75–85% H3PO4 serve food, electronics and battery-material makers.

Of the two routes, the wet process dissolves rock in sulfuric acid and accounts for the large majority of tonnage, which ties the business to both phosphate mining and sulfur supply. The thermal route burns elemental phosphorus and yields a very pure acid, but its power demand has confined it largely to China. Wet acid can also be cleaned by solvent extraction to approach thermal purity.

Phosphoric acid and polyphosphoric acids fall under Harmonized System subheading 2809.20. Most output becomes diammonium and monoammonium phosphate, triple superphosphate and NPK fertilizers. Other uses include animal feed phosphates, sodium and potassium phosphates for detergents and food, cola acidulant, metal surface treatment, water treatment and lithium iron phosphate cathode materials.

Phosphoric acid market overview and global demand

Global supply starts with phosphate rock, and the U.S. Geological Survey estimates world phosphate rock output at about 250 million metric tons in 2025, up 5% from 2024. China mined about 110 million tons, followed by Morocco at 36 million, the United States at 20 million, Russia at 14 million, Jordan at 12 million and Saudi Arabia at 10 million. Morocco holds about 50 billion of the world's 73 billion tons of reserves. In the United States, more than 95% of mined rock goes into wet-process phosphoric acid.

The USGS puts world consumption of P2O5 in fertilizers at 47.8 million tons in 2025, rising to 51.5 million tons by 2029, while phosphate capacity is projected to grow from 63.7 million to 71.7 million tons of P2O5. UN Comtrade data for HS 280920 show world exports of about USD 6.4 billion and 9.1 million tons of product in 2024. Morocco shipped about 4.5 million tons worth USD 3.55 billion in 2025, near USD 790 per ton of product, with China, Senegal, Israel, the United States and Belgium next.

India is the pivotal buyer, importing about USD 2 billion of acid in 2024, more than a third of reported world imports, to make DAP and NPK grades. Its quarterly contracts act as the trade benchmark: the India price settled at USD 1,700 per ton of P2O5 for the third quarter of 2026, up from USD 1,360 in the second quarter and USD 1,290 in the first, largely on sulfur costs. Purified acid demand grows faster, led by battery cathodes in China and food phosphates.

Phosphoric acid manufacturing process

Most new capacity uses the wet process, with the dihydrate route as the workhorse and hemihydrate or hemi-dihydrate variants chosen where stronger filter acid and lower steam use justify the licensing cost. In the core reaction, fluorapatite reacts with sulfuric acid and water to give phosphoric acid, calcium sulfate dihydrate, known as gypsum, and hydrogen fluoride.

• Rock preparation. Beneficiated rock at about 30–33% P2O5 is ground in ball or roller mills, or slurried with recycled weak acid, so that the attack is fast and complete.
• Reaction. Rock and sulfuric acid meet in agitated attack tanks at about 70–80 degrees Celsius for dihydrate, or 90–110 degrees for hemihydrate. Operators hold free sulfate within a narrow band so gypsum crystals grow large and filter well.
• Filtration. Tilting-pan or belt vacuum filters separate the gypsum cake, which is washed countercurrently to recover soluble P2O5. Filter acid leaves at about 26–30% P2O5 from dihydrate plants and 40–48% from hemihydrate plants.
• Concentration. Forced-circulation vacuum evaporators heated by low-pressure steam lift the acid to 52–54% P2O5. The steam usually comes from the adjacent sulfuric acid plant.
• Fluorine recovery and clarification. Evaporator vapors are scrubbed to recover fluosilicic acid, a saleable by-product, and the acid is aged and clarified to settle sludge before storage.
• Gypsum stacking and dispatch. Phosphogypsum, about 4.5–5 tons per ton of P2O5, is slurried to a lined stack while process water is recirculated. Acid is held in rubber-lined tanks and shipped by tanker, rail or pipeline.

Recovery of P2O5 from rock runs about 93–96%, so rock quality largely decides cost. Magnesium, aluminum, iron and organic matter raise viscosity and sludge, and cadmium or uranium content can limit where products sell.

Phosphoric acid plant setup cost

The reference plant produces 600 metric tons of P2O5 a day, about 198,000 tons a year over 330 days, and includes its own sulfur-burning sulfuric acid plant of about 1,700 tons a day. Total CapEx is estimated at USD 180–420 million, covering land, rock handling, both acid plants, concentration, the gypsum stack, storage, utilities, preoperative costs and a working capital margin.

Coromandel International put its Kakinada complex, announced at 650 tons a day of phosphoric acid and 1,800 tons a day of sulfuric acid, at about 10 billion rupees in April 2024, or about USD 120 million at an assumed 83.5 rupees per dollar, on an existing fertilizer site. Scaled to 600 tons with a 0.6 exponent, escalated an assumed 6% and with an assumed 40–60% added for greenfield land, stack and offsites, it reaches about USD 170–195 million, the floor of the range. For U.S. and EU sites, construction cost is assumed at 1.8–2.2 times the Indian base, which gives about USD 340–425 million. An Egyptian state consortium contracted a USD 658 million plant for 250,000 tons a year of high-concentration acid at Abu Tartour in June 2025. Scaled to 198,000 tons, it implies about USD 570 million, above the range, because the remote site must build its own infrastructure.

For the land row, the site needs about 60 hectares for process blocks, the tank farm, rock storage and the first gypsum stack cells. At an assumed USD 5–15 per square meter, land costs USD 3–9 million, about 2% of CapEx at the midpoint.

The sulfuric acid plant takes about 30% of CapEx and the reaction and filtration section about 22%. Running cost is dominated by two bought-in minerals.

Phosphate rock and sulfur together make up about 83% of operating cost in the central case. The full report can be customized to any country or region.