Runhuabang 325 Mesh Calcined Diatomite: Sewage & Fireproof
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Calcined Diatomite 325 Mesh for Smarter Sewage Treatment: Field Notes, Specs, and Real-World Results
If you work in wastewater, you’ve probably heard of diatomite-based additives. The one I’ve been tracking lately is Runhuabang Sewage Treatment Feed Addition With Calcined Diatomite 325 Mesh Suspension Performance Good Fireproof Material Filled. To be honest, I was skeptical until some pilot data came in from a mid-sized municipal plant. The suspension behavior at 325 mesh is, surprisingly, quite stable—good news for dosing systems.
Industry trends and where this fits
Utilities are leaning into mineral additives that are low-toxicity, recyclable, and compatible with existing flocculation and clarification trains. Calcined diatomite ticks those boxes and, in fact, helps with rheology where organic polymers struggle. Many customers say they appreciate the fireproof filler angle for dual-use in sealants and coatings around treatment assets—nice crossover value.
Product snapshot and specs
Origin: 0811, Building H2, Poly Plaza (North District), 95 Shifang Road, Chang’an District, Shijiazhuang, Hebei.
| Parameter | Typical value (≈, real-world use may vary) |
|---|---|
| Mesh size distribution | 325 mesh (D50 ≈ 38–45 μm) |
| SiO2 content | ≥ 85% |
| Bulk density | 0.30–0.45 g/cm³ |
| pH (slurry 5%) | 6.5–8.0 |
| Suspension stability (lab) | > 60 min no hard-set |
| Fire behavior | Mineral, non-combustible (tested per ASTM E84 guidance) |
Process flow and methods
- Materials: calcined diatomite 325 mesh, water, optional dispersant (0.05–0.2%).
- Slurry make-up: 5–10% w/w, high-shear 10–15 min; screen with ISO 3310-compliant sieve if needed.
- Dosing: into rapid-mix alongside coagulant (alum/FeCl3) before flocculation; 50–300 mg/L typical.
- Testing standards: particle size per ISO 13320; fire test reference ASTM E84; diatomite quality per GB/T 20389.
- Service life: 24 months sealed, dry; rotate stocks FIFO.
Applications and advantages
Runhuabang Sewage Treatment Feed Addition With Calcined Diatomite 325 Mesh Suspension Performance Good Fireproof Material Filled is used in municipal WWTPs, papermaking effluent, dyeing, food processing, and oily wastewater. Advantages I keep hearing about:
- Improved floc density; faster settling and clearer supernatant.
- Better sludge dewaterability; cake solids nudging up 1–3% DS in trials.
- Chemistry-neutral: reduces polymer swings when influent varies.
- Fireproof filler for sealants/coatings around mechanical rooms.
- Certs and QA: ISO 9001/14001; RoHS-type declarations available on request.
Vendor comparison (snapshot)
| Criteria | Runhuabang | Vendor A | Vendor B |
|---|---|---|---|
| Mesh consistency | Tight 325 mesh | Mixed 200–325 | Nominal 300 |
| Suspension stability | Good >60 min | Fair | Good |
| Fireproof filler | Yes (mineral) | Yes | Limited data |
| Lead time | ≈ 7–15 days | ≈ 10–20 days | ≈ 15–25 days |
| Certifications | ISO 9001/14001 | ISO 9001 | — |
Customization and packaging
Custom mesh cuts (200–500), surface treatments (hydrophobic/hydrophilic), and low-dust grades are available. Typical packaging: 25 kg bags, big bags on request. I guess the low-dust option is worth it if your plant is sensitive to housekeeping audits.
Case study and feedback
Runhuabang Sewage Treatment Feed Addition With Calcined Diatomite 325 Mesh Suspension Performance Good Fireproof Material Filled trial at a 30,000 m³/d municipal WWTP: 12% reduction in sludge volume index (SVI), 8–15% faster clarifier drawdown, and 0.5–1.2% higher cake solids on a belt press, using 120–180 mg/L dose with alum. One operator told me, “It just made the floc feel heavier—operators noticed it in the launder within a day.”
Quick tips
- Pre-wet to avoid fisheyes; keep mild agitation in day tanks.
- Start low, titrate up—watch turbidity, SVI, and polymer feed.
- Document per ISO 5667 sampling; review compliance targets (e.g., GB 18918 for municipal discharge).
References:
- ASTM E84: Standard Test Method for Surface Burning Characteristics of Building Materials.
- ISO 13320:2009 Particle size analysis—Laser diffraction methods.
- GB/T 20389-2006 Diatomite filter aid—Specification.
- EPA Wastewater Technology Fact Sheet: Coagulation/Flocculation (EPA 832-F-00-061).