Anionic PAM Emulsion for Coal Washing Water Clarification and Slurry Settling
Product Introduction
Coal washing circuits accumulate ultrafine coal, shale, and clay. Poor settling reduces recycled-water quality, disrupts separation performance, and increases tailings inventory.
The preferred APAM depends on coal rank, clay mineralogy, process-water salinity, particle size, and whether the objective is clarified water, thickener underflow, or flotation-tailings capture.
Anionic PAM emulsion for coal washing water aggregates fine coal, clay, and mineral solids for faster settling and clearer recycled water. Blufloc high-molecular-weight grades support continuous clarification and tailings thickening.
Application Challenges
- Stable fine coal and clay suspensions
- Dark overflow and poor process-water reuse
- Ore or seam changes that shift polymer demand
- High solids loading during production peaks
How the PAM Emulsion Works
APAM chains bridge fine coal and mineral particles after adsorption, forming larger aggregates that settle under gravity. Very-high molecular weight supports long-range bridging, while anionic degree must be compatible with particle surfaces and water chemistry.
Important: The suggested grades below are starting candidates, not a fixed prescription. Final selection and dosage require representative laboratory and plant trials.
Recommended Blufloc Grades
| Grade | Base | Molecular Weight | Charge | Suggested Screening Role |
|---|---|---|---|---|
| EA 6520 | Oil-based | Very High | High anionic | Strong candidate for coal tailings and clay-rich slurry |
| EWA 7520 | Water-based | Very High | Medium anionic | Water-based comparator for automatic wash-water treatment |
The product pages classify the cationic EC and EWC series as high molecular weight and the anionic EA and EWA grades as very high molecular weight. Exact commercial specification limits, active content, viscosity, shelf life, and preparation instructions should be confirmed on the current grade-specific TDS and order specification.
Product Advantages
- Rapid settling of fine coal and mineral solids
- Potential for clearer recycled wash water
- Continuous liquid dosing
- Grade choice for different seam and clay conditions
- Laboratory evaluation on fresh slurry
Application Process
- Collect fresh slurry from the actual circuit and prevent selective settling before testing.
- Record seam, ash, clay, solids, pH, conductivity, and temperature.
- Compare dose, dilution, and mixing under realistic slurry concentration.
- Measure settling, interface clarity, compacted solids, and overflow color or TSS.
- Validate the grade during representative production and seam changes.
Product Selection Guidance
EA 6520 is a strong first candidate for fine coal and clay-rich tailings. EWA 7520 should be compared where medium charge or water-based dosing offers better process compatibility.
Compare candidates on active polymer mass and total operating cost. Neat-emulsion price per kilogram can be misleading if products differ in activity, preparation efficiency, dose, equipment throughput, cake or underflow quality, and downstream disposal cost.
Operating Indicators to Record
- Settling rate
- Overflow TSS
- Underflow solids
- Polymer g/t
- Recycled-water impact
Troubleshooting Note
When seam changes cause poor flocculation, retest rather than only increasing dose. Clay type can change the preferred charge and dilution. Check whether high shear or a concentrated polymer feed is producing uneven distribution.
Packaging, Storage, and Safe Handling
Standard supply options shown on the Blufloc PAM emulsion product pages are 25 kg containers, 200 kg plastic drums, and 1000 kg IBCs. Keep the package sealed in a cool, dry, ventilated area and protect it from direct sunlight, freezing, and excessive heat. Follow the grade-specific TDS and SDS for shelf life, handling limits, and transport classification. Polymer spills can make floors extremely slippery and should be contained and cleaned promptly.
Why Choose Bluwat Chemicals
- More than 25 years of water-treatment chemical manufacturing experience, supported by three modern production plants.
- The company website reports more than 800,000 tons delivered and exports to over 100 countries and regions.
- Factory-direct coordination for grade selection, batch documentation, packaging, and export logistics.
- Laboratory screening support using customer water or sludge samples, with recommendations based on the actual treatment objective.
- TDS, SDS, COA, and applicable certification documents can be supplied for the selected grade and destination market.
For coal slurry settling and wash-water recycling, Bluwat can screen adjacent PAM emulsion grades, review preparation and dosing conditions, and help define a plant-trial plan using agreed performance indicators.
Quality Control and Technical Support
- Confirm the required grade specification and order documentation before production and shipment.
- Use representative customer samples to shortlist products under realistic pH, temperature, solids, water chemistry, and shear.
- Supply a clear make-down, dilution, dosing, and scale-up recommendation for the selected grade.
- Review plant-trial data and adjust charge level, dose, addition point, or mixing conditions when necessary.
Frequently Asked Questions
Can APAM recover fine coal?
It can aggregate suspended solids, but whether the solids are product or tailings depends on the circuit design and quality requirements.
Why test fresh coal slurry?
Particle surfaces and selective settling change during storage, making old samples less representative.
Does recycled-water salinity matter?
Yes. Dissolved ions can affect polymer conformation and mineral-surface interaction.
Can the same dose be used for every seam?
Seam and clay changes can require different dose bands or a re-screen.