Raw-Material Preparation
• Large limestone lumps are first crushed by a hammer crusher/ jaw crusher to <25 mm grains.
• A bucket elevator lifts the crushed material into a storage silo.
Metered Feeding
• An electromagnetic vibrating feeder sends the limestone evenly and continuously into the HGM ultrafine mill through the inlet sleeve.
Ultra-fine Grinding
• Inside the mill, a rotating turntable drives dozens of grinding rollers to roll and grind the material on the multi-layer grinding ring.
• The material is repeatedly impacted, rolled and ground, gradually reduced to micro-powder with a d97 ≤ 13 μm (≈ 1000 mesh).
Multi-stage Classification
• A high-speed classifier wheel above the chamber separates the particles; coarse ones fall back for re-grinding while the qualified fine powder is carried away by airflow.
Collection & Packaging
• The fine powder enters the cyclone collector and drops out through the discharge valve.
• A pulse-jet dust collector removes residual dust; clean air is exhausted via a silencer.
• The finished 1000-mesh limestone powder is pneumatically conveyed to the packing machine or bulk silo.
Environmental & Control System
• The whole line operates under negative pressure; no dust leaks.
• A PLC control cabinet monitors and adjusts feed rate, classifier speed and fan flow to keep stable quality and high capacity.