The manufacture of grinding mills for slag processing involves specialized engineering to handle the abrasive and hard nature of slag (a byproduct of metal smelting or coal combustion). Below are key aspects of slag grinding mill manufacturing, including types of mills, design considerations, and leading manufacturers.
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1. Types of Grinding Mills for Slag
Slag can be ground into fine powder (e.g., ground granulated blast furnace slag, GGBFS) for use in cement, concrete, or construction materials. Common mill types include:
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# A. Vertical Roller Mill (VRM)
– Best for: Large-scale slag grinding (high efficiency, low energy consumption).
– Features:
– Rollers press and grind slag against a rotating table.
– Integrated drying (useful for wet slag).
– Compact design, lower noise compared to ball mills.
– Manufacturers:
– LOESCHE (Germany)
– Gebr. Pfeiffer (Germany)
– Sinoma-Liyang (China)
# B. Ball Mill
– Best for: Smaller capacities or when producing ultra-fine slag powder.
– Features:
– Uses steel balls to grind slag in a rotating drum.
– Can be open or closed-circuit
– Manufacturers:
– FLSmidth (Denmark)
– CITIC Heavy Industries (China)
# C. Roller Press + Ball Mill (Hybrid System)
– Combines pre-grinding with a roller press and finish grinding in a ball mill for higher efficiency.
# D. Horizontal Mill (for Slag Cement)
– Used in blending slag with clinker for cement production.
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2. Key Design Considerations
– Material Hardness & Abrasiveness: Slag is abrasive; mills require wear-resistant linings (e.g., high-chrome steel, ceramic).
– Moisture Content: Wet slag may need pre-drying systems.
– Fineness Requirements: Adjustable classifiers for desired particle size (e.g., 400–600 m²/kg Blaine for GGBFS).
– Energy Efficiency: VRMs are preferred due to lower power consumption (~30% less than ball mills).
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3. Leading Manufacturers of Slag Grinding Mills
| Manufacturer | Country | Specialization |
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