Nonionic PAM

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[Application Scope]

Wastewater Treatment: Treating inorganic mineral suspensions (e.g., metallurgical and coal mine wastewater), especially suitable for positively charged colloids; Oil Extraction: Profile control and mobility control agent in oilfields, drilling mud additive to reduce water loss; Papermaking Industry: Retention and drainage aid, enhancing paper strength; Textile and Dyeing: Thickening of sizing agents, textile sizing; Soil Conditioning: Drought-resistant water retaining agent, improving soil structure; Mining and Metallurgy: Slurry sedimentation, tailings recovery.

[Product Characteristics]

Appearance: White granules

Solid Content: ≥88%

Molecular Weight: 4-12 million

Water-Insoluble Matter: ≤2%

Degree of Hydrolysis: ≤5%

Dissolution Time: ≤90 minutes

[Performance Features]

1. Non-ionic Characteristic: The molecular chain carries no charge, exhibiting strong salt resistance, suitable for high electrolyte concentration environments (e.g., high-salinity wastewater);

Insensitive to pH changes, maintaining good stability under both acidic and alkaline conditions (wide applicable pH range, typically 3-10).

2. Strong Flocculation and Adsorption Capacity: Forms hydrogen bonds with the surface of suspended particles via amide groups on the molecular chain, adsorbing fine particles to form large flocs, accelerating sedimentation or filtration.

3. Thickening and Adhesive Effect: Can significantly increase the viscosity of the aqueous phase, used as a thickener and adhesive (e.g., ceramic slurries, textile sizing).

4. Low Toxicity and Environmental Friendliness: Non-toxic in itself, but attention should be paid to the residual amount of its monomer acrylamide (industrial products need to comply with safety standards).

5. Weak Shear Resistance: The molecular chain is long, but high-speed stirring or strong shear force may cause the molecular chain to break, reducing flocculation efficiency.

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Nonionic PAM

Product Description

Non-ionic polyacrylamide is a water-soluble polymer and one of the series products of polyacrylamide (PAM). There are no ionic groups on its molecular chain, and it mainly relies on the amide group (-CONH₂) on the molecular chain to function, achieving flocculation through physical adsorption. It is suitable for positively charged or neutral suspension systems and is an important multi-functional additive in industry and water treatment. When selecting, the appropriate type should be determined based on water quality, process conditions (pH, salinity, etc.), and requirements (flocculation, thickening, etc.).

Mixing Method

The essence of dissolving non-ionic PAM is to fully stretch its molecular chains from a coiled state to exert optimal performance. Strictly following the principles of "slow addition, moderate stirring, and sufficient aging" will yield a uniform and stable solution.

Operating Procedure

Step 1: Water Preparation

Add about half of the total water volume into the dissolving tank, and start stirring (200-300 rpm).

Step 2: Powder Addition

Even Sprinkling: Slowly and evenly sprinkle the powder into the water vortex area (never dump it all at once or pour in the whole bag). A sieve or powder dispenser can be used to disperse the addition, ensuring the powder makes full contact with the water surface.

Step 3: Top-up and Aging

After all the powder is added, continue stirring for 10-20 minutes to allow the particles to disperse initially. Add the remaining water to reach the specified concentration, and continue stirring for 40-60 minutes until the solution is transparent and free of particles. Aging and Standing: Stop stirring and let it stand for 1-2 hours to allow the molecular chains to fully extend, so the solution reaches its best viscosity.

Application Method

The dosing of non-ionic polyacrylamide (NPAM) is the key link to its effectiveness. It is not just a matter of "adding it in," but rather a systematic project involving concentration, point, method, and mixing intensity.

1. The dosage must be determined through "beaker tests"; theoretical calculations are only for reference.

1. Take representative water samples into several beakers.

2. Prepare a series of concentrations of non-ionic polyacrylamide working solutions.

3. Fixed stirring procedure: Rapid stirring (150-200 rpm) for 1-2 minutes to allow the chemical and water to mix thoroughly; switch to slow stirring (50-60 rpm) for 5-10 minutes to promote floc growth.

4. Observe after standing (5-10 minutes), comparing floc size, settling speed, and supernatant clarity.

Select the dosage with the best effect and lowest cost as the on-site dosing baseline. The typical dosage range is very wide, ranging from 0.5 ppm to 20 ppm (0.5-20 grams of dry powder per ton of water).

2. Key Points for On-site Dosing

Dosing Method:

1. Gravity Drip Feeding: Suitable for small systems, controlling flow through valves.

2. Metering Pump Dosing: The most recommended method. Using screw pumps or diaphragm metering pumps allows for precise flow control, achieving continuous and stable dosing.

3. Avoid Direct Impact: The dosing pipe outlet should be inserted below the liquid surface, or aimed at a turbulent area of the water flow, which is conducive to rapid dispersion.

3. Mixing Intensity Control (Crucial for Flocculation):

Stage 1: Rapid Mixing (Dosing Point). Intense turbulence is required (G value approx. 300-600 s⁻¹), allowing the chemical to diffuse evenly throughout the water body within 10-30 seconds.

Stage 2: Slow Mixing (Reaction Tank). Gentle stirring is required (G value approx. 20-80 s⁻¹), maintained for 5-20 minutes, allowing the flocs to gradually grow larger and denser, avoiding being broken.

Precautions

1. Prohibition: Never pour NPAM powder or high-concentration mother liquor directly into the treatment tank.

2. Compatibility Test: If used in combination with inorganic coagulants (PAC/PFS), a compatibility test must be done to determine the dosing sequence and interval time (usually add the inorganic agent first, stir for 30-60 seconds, then add non-ionic polyacrylamide).

3. Pipe Adhesion: The solution is viscous; when stopping the pump, flush the dosing pipeline with clean water to prevent blockage.

4. Response to Performance Fluctuations: Small flocs, slow settling: insufficient dosage or inadequate mixing intensity; Loose, fragile flocs: excessive dosage or excessive stirring shear; Turbid supernatant: need to check if the pH is suitable, or if there are competing interfering substances.

Packaging and Storage

Packaged in 25Kg plastic-lined woven bags or paper-plastic composite bags, or according to user requirements. When storing and transporting non-ionic polyacrylamide, pay attention to heat and moisture protection to prevent packaging damage. The dry powder product will absorb moisture and form lumps if exposed for a long time. The number of stacking layers must not exceed 20. The effective storage period is 2 years. The product particle size is 20-80 mesh, and can also be produced according to user requirements.