Project Description

Defoamer for Phosphoric Acid Production: Process-Specific Foam Control

Foam generation in phosphate rock processing severely reduces reactor volume, slows down gypsum filtration, and impacts evaporation efficiency. Standard industrial defoamers degrade rapidly under these extreme conditions.

INVINO formulates specific defoamers for phosphoric acid production to deliver measurable process improvements:

  • Extreme Chemical Stability: Withstands harsh WPA digestion (pH 1-2) without degradation.
  • Thermal Endurance: Maintains active foam knockdown up to 120°C (HH/HDH & Evaporation).
  • Faster Filtration: Degasses slurries to prevent filter blinding and maximize P₂O₅ recovery.
INVINO High-Temp Acid Resistant Defoamer
  • INVINO High-Temp Acid Resistant Defoamer
  • defoamer pallet

Foam Control Solutions Across the Phosphate Processing Value Chain

Effective foam control in the phosphate industry requires distinct chemical approaches based on the specific operational stage. From alkaline beneficiation to highly acidic Wet Process Phosphoric Acid (WPA) digestion, our defoamers are formulated to withstand exact process parameters.

Stage 1: Phosphate Beneficiation (Flotation & Washing)

pH: 6-10 | Temp: 25-45°C
PROCESS CHALLENGES
  • Foam generated by collectors (fatty acids) and amines during reverse flotation.
  • Pump cavitation and thickener overflow due to high ionic strength recycled water.
DEFOAMER REQUIREMENTS
  • Stable in alkaline mediums.
  • Fast knockdown effect with zero negative impact on flotation selectivity.

Stage 2: WPA Digestion & Filtration

pH: 1-2 | Temp: 75-110°C

Severe foaming in reactor tanks (caused by CO₂ release and organic matter) restricts effective volume. The choice of defoamer is strictly dictated by your WPA process route:

DH (Dihydrate) Process
Temp: 75–85 °C

Traditional and mature route widely used in established plants. Features relatively mild chemical conditions compared to other processes.

Solution: INVINO-P9502
HH (Hemihydrate) Process
Temp: 95–105 °C

Optimized for energy efficiency and higher P₂O₅ recovery. Common in newer installations. Requires highly temperature-resistant defoaming agents.

Solution: INVINO-P9300 / P9302
HDH (Hemihydrate-Dihydrate)
Temp: 100–110 °C

Advanced, highly efficient process with extremely vigorous reactions. Places severe demands on defoamer chemical stability and persistence.

Solution: INVINO-P9300 / P9302

Stage 3: Acid Evaporation / Concentration

pH: 1-2 | Temp: 90-120°C | Vacuum
PROCESS CHALLENGES
  • High boiling turbulence and vacuum conditions cause acid entrainment into vapor lines.
  • Risk of severe scaling in heat exchangers.
DEFOAMER REQUIREMENTS
  • Extreme thermal stability up to 120°C in highly corrosive mediums.
  • Low volatility and strictly non-fouling properties.

Defoamer Selection Matrix for Phosphate Processing

Selecting the correct defoamer chemistry is dictated by your specific process temperatures, acid concentrations, and downstream restrictions (e.g., strictly silicone-free requirements). Review our technical matrix to identify the exact agent for your formulation.

Process Stage Environment Key Performance Parameters Recommended Models
Phosphate Beneficiation
(Flotation & Washing)		 pH: 6-10 | 25-45°C Stable in alkaline medium. Zero impact on collectors (fatty acids) and flotation selectivity. INVINO-3300 Request TDS ⬇
WPA Digestion & Filtration
(Standard DH Process)		 pH: 1-2 | 75-80°C Rapid knockdown in reactor. Degasses slurry to improve gypsum filtration rates. INVINO-P9502 Download TDS ⬇
Acid Evaporation & High-Temp WPA
(HH / HDH Process & Concentration)		 pH: 1-2 | 90-120°C Extreme thermal stability. Non-fouling to prevent scaling in heat exchangers. Prevents entrainment losses. INVINO-P9300 / P9302 Request TDS ⬇

Technical FAQ for Phosphoric Acid Producers

Q: Will the defoamer negatively impact P2O5 recovery or gypsum quality?
No. Our specialized WPA defoamers are formulated to minimize P2O5 loss in the discarded gypsum cake. By efficiently removing entrained air, they improve the washing efficiency of the filter cloth, ensuring higher P2O5 recovery rates without altering gypsum crystal morphology.
Q: Silicone vs. Non-Silicone: Which is required for WPA?
This depends strictly on your plant's downstream requirements. Silicone-based defoamers offer extremely high efficiency and temperature resistance (up to 120°C). However, if downstream processes or specific fertilizer grades restrict silicone contamination, our Non-Silicone mineral oil-based formulations (like INVINO-P9502) provide excellent acid stability without the risk of silicone residues.
Q: Do your defoamers cause scaling in heat exchangers during evaporation?
Formulations designed for Stage 3 Evaporation (90-120°C) are engineered with strictly non-fouling properties. They maintain vacuum stability and prevent acid entrainment into vapor lines without precipitating or scaling the heat exchange surfaces.


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