Efficient Grinding Solutions for Solid Waste: Phosphogypsum and Coal Gangue Grinding Mills

Efficient Grinding Solutions for Solid Waste: Phosphogypsum and Coal Gangue Grinding Mills

The treatment of industrial solid waste, particularly phosphogypsum and coal gangue, presents significant challenges in terms of environmental impact and resource utilization. Efficient grinding technologies play a pivotal role in transforming these waste materials into valuable resources for construction materials, soil amendments, and other industrial applications. This article explores advanced grinding solutions tailored for these specific materials, with a focus on technological innovations that enhance efficiency, reduce energy consumption, and ensure environmental compliance.

Challenges in Phosphogypsum and Coal Gangue Processing

Phosphogypsum, a byproduct of phosphate fertilizer production, contains residual acids and heavy metals, requiring specialized handling. Coal gangue, with its heterogeneous composition and high hardness, demands robust grinding equipment capable of processing abrasive materials. Key challenges include:

• Material Hardness: Coal gangue often has a Mohs hardness of 3-7, necessitating wear-resistant grinding components.
• Moisture Sensitivity: Phosphogypsum’s hygroscopic nature affects flowability and grinding efficiency.
• Environmental Concerns: Dust control and heavy metal immobilization are critical during processing.

Technological Requirements

Recommended Grinding Solutions

1. SCM Ultrafine Mill for High-Precision Applications

For phosphogypsum requiring ultra-fine grinding (D97 ≤ 5μm), our SCM Ultrafine Mill delivers exceptional performance:

• Precision Grading: Vertical turbine classifier ensures 325-2500 mesh output with no coarse particle contamination.
• Energy Efficiency：30% lower energy consumption compared to jet mills, with throughput up to 25 ton/h.
• Environmental Protection: Integrated pulse dust collector achieves >99.9% efficiency, meeting strict emission standards.

2. MTW Series Trapezium Mill for Coal Gangue

When processing coal gangue at medium fineness (30-325 mesh), the MTW Series Trapezium Mill offers:

• Enhanced Durability: Combination wear plates and curved blade design reduce maintenance costs by 30%.
• Optimized Airflow: Arc-shaped air channel minimizes pressure loss, improving energy efficiency.
• High Capacity: Models ranging from 3-45 ton/h accommodate varying production scales.

Case Study: Integrated Waste Utilization System

A recent project in Shandong, China combined our SCM and MTW mills to process 200,000 tons/year of phosphogypsum and coal gangue mixture:

1. Primary Crushing: Hammer mill reduced feed size to <20mm.
2. Drying System: Rotary dryer lowered moisture to <5%.
3. Grinding Stage:
   • MTW175G mill processed coal gangue to 100 mesh for cement additives.
   • SCM1250 mill produced 800 mesh phosphogypsum for gypsum board production.

The system achieved 92% resource utilization with dust emissions below 10mg/m³.

Selecting the appropriate grinding technology is critical for optimizing solid waste valorization. Our SCM and MTW series mills provide tailored solutions that address the unique challenges of phosphogypsum and coal gangue processing, combining high efficiency with environmental sustainability. For specific material testing or system design consultation, please contact our technical team.