Di-Calcium Phosphate (DCP) is widely used in animal feed, food additives, and mineral supplements.These applications require controlled fine grinding with uniform particle size distribution (PSD) to ensure proper mixing, improved bioavailability, and consistent product performance.
Due to its moderate abrasiveness and relatively higher bulk density, conventional grinding systems may face challenges such as wear, inconsistent fineness, and higher energy consumption.
The Air Classifying Mill (ACM) system offers a high-efficiency solution for producing uniform fine powder. Its integrated grinding and dynamic classification design ensures precise fineness control, high product recovery, minimal heat generation, and dust-free operation.
This application note outlines the process flow, system design, technical performance, and advantages of an ACM plant optimized for Di-Calcium Phosphate grinding.
Design and Working Principle
The grinding system operates on a continuous, automated principle comprising the following stages:
Step 1: Material Feeding
Raw material is fed into the system through a feed hopper (SS304).
A Rotary Airlock Valve (RAL – AL-150) ensures:
- Uniform and controlled feeding
- Air sealing to maintain system pressure balance
- Prevention of backflow
Step 2: Impact Grinding in ACM Rotor
Material enters the grinding chamber where it is subjected to high-speed rotor action.
Grinding occurs due to:
- Impact of hammers/pins
- Shearing forces
- Particle-to-particle collision
- Air turbulence
The rotor creates strong airflow, keeping particles suspended and ensuring efficient size reduction.
Step 3: Air Classification
The ground material enters the dynamic classifier zone.
- Classifier wheel rotates at controlled speed (VFD driven)
- Fine particles pass through and exit with airflow
- Coarse particles are rejected and returned for regrinding
This ensures:
- Narrow particle size distribution
- Minimal oversize
- Consistent product quality
Step 4: Pneumatic Conveying & Cooling
The centrifugal fan generates airflow that:
- Conveys material to downstream system
- Maintains system temperature near ambient
- Enhances classification efficiency
For DCP, this helps:
- Maintain flowability
- Avoid excessive heat build-up
- Ensure stable grinding performance
Step 5: Bag Filter & Product Collection
The air-material mixture enters the bag filter where:
- Powder is separated from air
- Fine particles are collected efficiently (>99%)
- Clean air is exhausted or recirculated
Pulse-jet cleaning ensures continuous operation without choking.
Step 6: Product Discharge
Collected powder is discharged via Rotary Airlock Valve (AL-200) into:
- Storage bins
- Packing systems
- Downstream processing
Model Variants
| Variant | Model | Capacity (Approx.) | Fineness |
|---|---|---|---|
| DCP-10-SS | ACM 10 SS304 CP | 150 – 180 kg/hr | 99% < 44 microns |
| DCP-30-SS | ACM 30 SS304 CP | 375-400 kg/hr | 99% < 44 microns |
| DCP-60-SS | ACM 60 SS304 CP | 750-900 kg/hr | 99% < 44 microns |
⚠️Capacity may vary depending on material characteristics and fineness requirement.
Key Components
| Component | Function | Key Technical Feature |
|---|---|---|
| ACM Mill (ACM 10) | Grinding and classification | Integrated rotor + classifier, adjustable fineness (~150 micron) |
| Feed Hopper + RAL (AL-150) | Controlled material feeding | Uniform feed, airlock sealing |
| Bag Filter System | Powder separation & dust control | >99% recovery, pulse-jet cleaning |
| Centrifugal Fan (C-Fan) | Airflow generation | Maintains system pressure, conveying & cooling |
| Control Panel (MCC/PLC) | System control & monitoring | VFD control, interlocks, automation ready |
| Ducting System | Equipment interconnection | Optimized airflow, low pressure drop |
Key Features & Benefits
- Precise Fineness Control
- Consistent Product Quality
- High Product Recovery (>99%)
- Dust-Free Operation
- Energy Efficient System
- Reliable Continuous Operation
- Automation & Easy Control
- Low Maintenance Requirements
- Hygienic Design
Dynamic classifier with VFD enables accurate control of particle size (~150 microns).
Closed-loop grinding and classification ensure stable PSD.
Efficient bag filter minimizes material loss.
Fully enclosed system ensures clean and safe working environment.
Optimized airflow and mill design reduce power consumption.
Designed for 24/7 industrial usage.
PLC/MCC system enables real-time monitoring and control.
Wear-resistant internals suitable for moderately abrasive material.
SS304 contact parts suitable for feed/food-grade applications.
Applications
- Animal Feed Additives
- Poultry & Cattle Feed
- Food-Grade Phosphate Blending
- Mineral Supplements
Model Variants
| Variant | Model | Capacity (Approx.) | Fineness |
|---|---|---|---|
| DCP-10-SS | ACM 10 SS304 CP | 150 – 180 kg/hr | 99% < 44 microns |
| DCP-30-SS | ACM 30 SS304 CP | 375-400 kg/hr | 99% < 44 microns |
| DCP-60-SS | ACM 60 SS304 CP | 750-900 kg/hr | 99% < 44 microns |
Performance Parameters
| Characteristic | Specification |
|---|---|
| Feed Size | <1 mm |
| Final Fineness | 99(-) 44 microns |
| Bulk Density | 450 – 700 kg/m³ |
| Moisture | < 1% |
| Product Recovery | > 99% |
| Operating Temperature | Ambient |
| Noise Level | ~95 dB (without acoustic enclosure) |