Di-Calcium Phosphate (DCP) Grinding Plant

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.

Di-Calcium Phosphate (DCP) Grinding Plant

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
  • Dynamic classifier with VFD enables accurate control of particle size (~150 microns).

  • Consistent Product Quality
  • Closed-loop grinding and classification ensure stable PSD.

  • High Product Recovery (>99%)
  • Efficient bag filter minimizes material loss.

  • Dust-Free Operation
  • Fully enclosed system ensures clean and safe working environment.

  • Energy Efficient System
  • Optimized airflow and mill design reduce power consumption.

  • Reliable Continuous Operation
  • Designed for 24/7 industrial usage.

  • Automation & Easy Control
  • PLC/MCC system enables real-time monitoring and control.

  • Low Maintenance Requirements
  • Wear-resistant internals suitable for moderately abrasive material.

  • Hygienic Design
  • 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)