Project Description
Defoamer for Phosphoric Acid Production | Wet Process Foam Control
Foam during phosphate rock digestion is a serious drag on a wet-process phosphoric acid (WPA) plant. It cuts the reactor's effective volume, slows gypsum (calcium sulfate dihydrate) crystallization, and chokes vacuum filtration — directly lowering P2O5 recovery. The foam comes mainly from CO₂ released as the rock reacts, plus organic matter in the rock, all inside a highly corrosive acid environment.
INVINO® makes silicone-free aliphatic hydrocarbon defoamers built to stay stable in strong acid (pH 1.0–2.0) and the 75–85°C of a standard dihydrate (DH) reactor. They speed up slurry degassing to stop filter-cloth blinding and protect maximum P2O5 recovery.
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Process-Specific Foam Control Criteria for Phosphoric Acid
- Extreme Acid Stability: Stays stable in strong WPA acid (pH 1.0–2.0) without breaking down or separating.
- Thermal Persistence: Keeps working and de-aerating up to 85°C through the dihydrate reactor loop.
- Faster Cake Filtration: Releases trapped gas from the gypsum slurry so it does not blind the filter cloth — cutting wash water and raising net P2O5 yield.
Defoamer Selection Guide for Phosphate Processing
| PROCESS STAGE / GRADE | KEY PERFORMANCE | DATA SHEET |
|---|---|---|
|
INVINO-P9502 Wet Process Phosphoric Acid (Dihydrate Process) | A highly persistent, silicone-free aliphatic hydrocarbon defoamer. Strong acid resistance in corrosive digestion tanks and excellent thermal stability under continuous heat. Speeds gas release from the gypsum slurry to prevent vacuum filter-cloth blinding. | DOWNLOAD TDS |
Technical FAQ for Phosphoric Acid Producers
Q: Will the defoamer reduce P2O5 recovery or harm gypsum crystal quality?
A: No. A poorly formulated antifoam can break under heavy agitation and leave oily residues that distort calcium sulfate dihydrate crystals. INVINO-P9502 is chemically inert to crystallization, keeping clean rhombic crystals so the filter cake washes fast.
Q: Silicone vs. non-silicone — which is right for WPA?
A: Use non-silicone. Standard silicone (dimethylpolysiloxane) fluids can break down in hot, concentrated phosphoric acid and form silica deposits that blind the vacuum filter cloth. We use a non-silicone aliphatic defoamer that avoids filter blinding and membrane fouling.
Q: Does the defoamer cause scaling in the acid evaporators?
A: No. The active is low-volatility and splits cleanly into the gypsum cake during belt filtration, so it does not carry over into the vacuum evaporators or cause carbon scaling on heat-exchanger walls.
Request Your WPA Defoamer Solution
Standard Protocol for Mineral Acid Sample Verification
System Parameter Submission
Share your phosphate rock grade, organic matter content, reactor temperature, and filtration setup.
Free Lab Test (Rock Digestion + Vacuum Filtration)
Our lab runs a simulated rock digestion and vacuum cake filtration trial to match a scale-free, silica-free grade — free of charge.
Free Sample Dispatch
Free trial samples ship via air express for on-site digestion-tank testing. No MOQ at sample stage; buyer covers freight, refunded on the first bulk order.
