Supplementary Cementitious Materials Grinding Plant

The raw materials for admixtures primarily include active materials such as volcanic ash, steel mill slag, and water slag. The production line adopts an integrated continuous operation process, with key components including: raw material weighing and conveying system, grinding system, return material system, hot air system (optional), and finished product storage and transportation system.

Process Flow

Step 1
Raw Material Metering and Conveying System

The raw material conveying system is designed as a ground warehouse feeding system, with a quantitative feeding belt at the lower end of the ground warehouse for quantitative feeding. The material is lifted by a bucket and fed into a locked air feeder, where it is then fed into the mill.
Step 2
Grinding System

A dedicated vertical mill processes mixed materials under negative pressure, equipped with independent lubrication/hydraulic stations. Ground material is classified and collected via a pulse bag filter with waterproof/oil‑proof membranes. A high‑voltage variable‑frequency fan motor optimizes output and energy efficiency, ensuring versatile, compliant operation.
Step 3
Return System

Vertical mills feature external slag discharge to remove over‑ground or dense materials. Discharged material is conveyed to an iron remover for metal extraction and manual handling. The remaining material is returned to the mill via a bucket elevator and air‑lock valve for regrinding.
Step 4
Hot Air System (Optional)

The vertical mill uses a closed‑loop hot air system to reduce exhaust volume and energy consumption while recycling heat. The system generates 800‑900°C flue gas from kiln waste heat or a coal/gas‑fired hot air stove. This gas is mixed with cold and circulating air to produce 250‑350°C drying gas for the mill. Airflow is automatically controlled by globe and damper valves.
Step 5
Finished Product Storage and Transportation System

The finished products collected by the pulse dust collector are collected by the screw conveyor and sent to the corresponding finished product silo by the bucket elevator.

Working Principle

The mill operates on material‑bed grinding: a rotating grinding disc forms a stable material layer, while hydraulic‑powered rollers apply high pressure to crush material through compression and shear. Simultaneously, hot air enters from the bottom air duct, lifting and drying fine particles (moisture ≤8%). An integrated vortex classifier adjusts fineness via blade angle (typically ≤10% residue on 45 μm sieve), combining grinding, classification, and drying in one unit without external drying equipment.

Technical Advantage

Efficient and Energy-Saving

Material-layer grinding delivers significantly higher efficiency than ball mill impact grinding, with unit product power consumption reduced to 60-70% of a ball mill's. A single production line can save millions of kilowatt-hours annually.

Compact process

Integrating grinding, grading, and drying functions, the equipment occupies only 50% -60% of the ball mill system, reducing civil engineering investment by more than 30%.

Superior Product Quality

Features particles with high sphericity and balanced gradation. Specific surface area is easily adjustable (300-450 m²/kg), enhancing cement hydration and concrete strength.