Anionic Polyacrylamide (APAM) | Industrial Flocculant & Coagulant
Anionic Polyacrylamide (APAM) is a high-molecular-weight, water-soluble synthetic copolymer featuring negatively charged carboxyl groups (−COO−) along its carbon backbone. It drives solid-liquid separation via electrostatic charge neutralization and multi-point polymer bridging across suspended mineral fines and metal hydroxides.
PAMChem manufactures APAM under strict ISO 9001 and ISO 14001 quality systems, controlling chain-scission to ensure high mechanical shear resistance during high-speed centrifugation and pump transfer.
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Product Grades & Types
Solid Powder (Granular)
≥ 88% active solid content. Requires mechanical dry-powder feeders and aging tanks (0.1%–0.2% concentration). Best for large-scale municipal plants, mining thickeners, and paper mills.
Liquid Emulsion
20%–50% active polymer dispersed in hydrocarbon oil with inversion surfactants. Inverts rapidly via inline static or mechanical mixers. Best for mobile dewatering units or sites lacking powder makeup systems.
Molecular Weight (12 × 10⁶ to 28 × 10⁶ Daltons): Determines chain length and physical bridging capacity. Ultra-high molecular weight grades resist high mechanical shear.
Anionic Degree (10% to 50%): Molar charge density. Low degrees (10%–20%) target mineral suspensions; high degrees (30%–50%) target organic-inorganic blended wastewater.
Dissolution Kinetics: Hydrates fully within 30–45 minutes at 300–400 RPM (0.1% concentration), leaving minimal unswollen micro-gels ("fisheyes").
Operating Range: Functions stably across pH 5.0–11.0.
Technical Specifications
Typical parameters for standard industrial solid APAM:
|
Test Parameter |
Specification Value |
Test Method / Regulatory Standard |
|
Appearance |
White to off-white free-flowing granules |
Visual inspection |
|
Solid Content (%) |
≥ 88% |
Gravimetric (105°C, 2 hours) |
|
Molecular Weight (Million Daltons) |
15–25 |
Ubbelohde Viscometer |
|
Anionic Degree (%) |
20–40 (Customizable) |
Potentiometric Titration |
|
Dissolution Time (min) |
≤ 45 (in clean water at 0.1%) |
Visual observation at 400 RPM |
|
Residual Acrylamide Monomer (%) |
< 0.05% |
High-Performance Liquid Chromatography (HPLC) |
|
Bulk Density (g/cm³) |
0.60–0.80 |
Cylinder poured density method |
|
Regulatory Compliance |
REACH Pre-registered / Compliant |
EU Regulation (EC) No 1907/2006 |
Applications
Sludge Dewatering
Accelerates free water release in belt filter presses, screw presses, and decanter centrifuges.
Mining Tailings
Promotes rapid settling of iron ore, copper, gold, and coal washing sludges in gravity thickeners for clear water reuse.
Effluent Clarification
Removes suspended solids and heavy metal precipitates when paired with primary inorganic coagulants (PAC, FeCl₃).
Papermaking
Acts as a dry strength enhancer and filler retention aid in neutral/alkaline wet-end systems.
Grade Selection Guide
Analyze Zeta Potential
Confirm suspended solids carry positive surface charges. APAM requires primary inorganic coagulants when treating negatively charged organic colloids.
Match Shear Stress
High-speed centrifugal dewatering demands ultra-high molecular weight grades to prevent floc breakage.
Jar Testing Protocol
Prepare a 0.1% solution with plant makeup water, test dosages from 0.5 ppm to 5.0 ppm, and evaluate settling velocity, supernatant clarity, and cake solids percentage.
Manufacturing & Quality Control
Polymerization & Milling
Produced via free-radical aqueous or inverse emulsion polymerization, followed by indirect vacuum drying and precision pneumatic air-classification (20–60 mesh particle distribution).
QA Traceability
Every production lot is tested for Brookfield viscosity, residual monomer, and dissolution residue. Retention samples and batch-specific Certificates of Analysis (CoA) are archived for 3 years.
Packaging & Storage
Powder
25 kg multi-wall kraft paper bags with polyethylene moisture liners (palletized); 750 kg / 1,000 kg FIBC bulk bags with discharge spouts.
Emulsion
200 kg HDPE drums or 1,000 kg IBC totes.
Handling
Store in sealed packaging below 30°C in dry conditions. Powder absorbs humidity rapidly, causing caking. Spilled polymer is extremely slippery; sweep mechanically and rinse with water.
Customization & Sample Testing
Customization
Molecular weight and anionic degree parameters are adjustable for non-standard effluent matrices.
Sample Dispatch
500g laboratory sample kits are available alongside complete SDS and TDS upon submission of effluent origin and equipment specifications.
Frequently Asked Questions
As one of the leading anionic polyacrylamide manufacturers and suppliers in China, we warmly welcome you to buy the best anionic polyacrylamide made in China here from our factory. For price consultation, contact us.
