Autoclaved Aerated Concrete (AAC) blocks have become a cornerstone of sustainable construction, with fly ash utilization being central to their eco-friendly production. Processing fly ash to 325 mesh (45 μm) is critical for achieving optimal block strength (3.5-5 MPa), dry density (550-650 kg/m³), and thermal insulation (λ=0.11-0.16 W/mK). This article examines the technical requirements and advanced milling solutions for high-quality AAC production.
| Property | Target Value | Impact on AAC Performance |
|---|---|---|
| Fineness (325 mesh) | ≥92% passing 45 μm sieve | Controls pozzolanic reaction speed |
| LOI (Loss on Ignition) | ≤5% | Prevents gas retention defects |
| SiO₂+Al₂O₃ Content | ≥70% | Ensures stable silicate structure |
| Moisture | ≤1% | Maintains slurry viscosity |
Our vertical grinding systems process raw fly ash (typically 100-200 mesh) to 325 mesh in closed-circuit operation:
Case Example
A 300,000 m³/year AAC plant in Vietnam using our LM vertical mill achieved:
Precision-ground fly ash enables stable slurry parameters:
| Parameter | Value Range |
|---|---|
| Water/Solid Ratio | 0.50-0.55 |
| Aluminium Powder | 0.08-0.12% |
| Mixing Temperature | 40-45°C |
For project-specific grinding solutions, download our Fly Ash Optimization Guide for AAC Manufacturers or contact our engineering team for a free milling test with your material samples.
Based on the absorption of advanced technologies of famous international corporations and 30 years’ experience in grinding mill production, SBM has launched the LM Vertical Grinding Mill which integrates five functions of crushing, grinding, powder selection, drying and material conveying. It is characterized by centralized technological process, small occupational area, low investment, high efficiency, energy conservation and environment protection.
