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Preliminary Suggestions
| Typical indicators / objective observations | Likely direct causes | Low-cost actions to try first | When you should introduce / re-select PAM | Why PAM is recommended here |
|---|---|---|---|---|
| High SS/turbidity persists | Ultra-fines and colloids remain stabilized; insufficient aggregation | Increase effective settling area; control inflow turbulence; standardize sampling | When physical settling cannot reach reuse clarity targets | PAM aggregates suspended fines, accelerating clarification and reducing SS |
| Large swings after rain/seasonal change | Feed solids and surface chemistry shift; dilution changes ionic strength | Segment streams; stabilize pH where possible; adjust dosing by trend not guesswork | When a robust reuse program is required across variability | Correct selection window maintains performance across changing water conditions |
| Downstream fouling or plugging from carryover | Solids not captured; insufficient residence; dosing point ineffective | Optimize dosing point and mixing to ensure contact with fines | When protection of downstream equipment is the KPI | PAM improves capture and reduces carryover that causes fouling |
Applicability boundary: Applicable for clarification to enable reuse. If turbidity is driven mainly by dissolved color or organics rather than SS, address coagulation/oxidation needs first and then refine polymer selection.
Selection guidance: how to choose the right PAM for this circuit
Molecular weight (MW): bridging power vs. shear sensitivity
Higher MW typically improves bridging and aggregation, accelerating settling and improving clarification. However, high-MW flocs can be more shear-sensitive. If flocs form but break near the feedwell, pumps, or valves, MW and dosing point must be adjusted together.
Charge density (ionicity): matching particle surface chemistry
Charge density determines how strongly PAM interacts with fines and colloids. Too low may underperform; too high (or overdosing) may create fragile flocs or re-stabilize particles. The correct window depends on mineralogy, reagent regime, and water chemistry.
APAM / NPAM / CPAM: selecting the ionic type for the job
For many mining clarification and thickening applications, anionic or nonionic PAM is commonly evaluated first. Cationic grades may be relevant in specific streams where surface charge and contaminants require a different interaction profile.
Emulsion vs powder: choosing by site constraints
Powder grades can be cost-effective for stable operations with controlled solution preparation. Emulsion grades are often preferred when rapid dissolution, faster response, and more automated dosing are needed.
Initial recommendation
Starting point: Start with an anionic/nonionic PAM program focused on clarity at stable dosage. Validate with the real return-water variability (dry vs rainy days) to ensure the operating window is robust.
Contact us for a precise grade recommendation
A precise recommendation requires your real operating data. Please submit the form and include the items below (you may provide ranges/estimates if exact values are not available). We also welcome complex or rare cases.
- Return-water turbidity/SS range and target: Defines the clarity gap and success criteria.
- Temperature and seasonal variability: Explains performance shifts and helps select a robust window.
- pH and conductivity/salinity: Affects polymer interaction strength and optimum dose.
- Current settling/clarifier configuration: Determines required floc strength and mixing strategy.
- Dosing point and contact time: Ensures polymer actually interacts with suspended fines.
- Problem repeat probability: Guides control strategy and grade robustness.
What you will receive: recommended PAM type/form, 2–3 candidate grade windows, an initial dosing range for a controlled trial, and step-by-step jar test / plant trial guidance.
