Iron ore coarse crushing process with jaw crusher

Iron ore coarse crushing process with jaw crusher

Iron ore features high hardness and strong abrasiveness. Jaw crusher is the mainstream primary coarse‑crushing device for iron ore processing plants. It breaks large run‑of‑mine iron ore blocks into qualified intermediate particle size, preparing feed material for subsequent cone crushing, ball milling and magnetic separation workflows.

Complete coarse‑crushing workflow

  1. Raw ore receiving & scalping Blasted iron ore is delivered by dump trucks to the receiving hopper. A vibrating grizzly feeder performs pre‑screening. Fine ore below the set size bypasses the jaw crusher directly, only over‑size lumps go into the crushing cavity, reducing unnecessary load and blocking risk.
  2. Jaw crusher primary squeezing crushing Large iron ore enters between fixed jaw plate and movable jaw plate. Reciprocating squeezing force fractures ore blocks. Discharge gap is adjusted according to downstream process requirement, typical discharge size ranges 120‑250 mm for iron ore coarse crushing. High‑manganese jaw dies are essential to resist severe abrasive wear from iron ore.
  3. Discharge transportation Crushed iron ore falls onto the belt conveyor. Metal detectors are installed to catch stray steel fragments such as drill bits, which may damage crusher and follow‑up equipment.
  4. Closed‑circuit or open‑circuit output
  • Open circuit (most common for coarse crushing): Crushed material is directly sent to secondary cone crushing workshop, no return re‑crushing.
  • Semi‑closed circuit: Oversize from the vibrating screen returns back to jaw crusher when stricter top‑size control is required, less popular for iron ore primary stage.

Key configuration points for iron ore coarse crushing

  1. Model selection Large‑scale iron ore mines choose heavy‑duty primary jaw crusher with large feed opening, reinforced frame and high load‑bearing capacity. Medium‑sized mines adopt standard PE series jaw crusher. For temporary mining sites, tracked mobile jaw crushing unit can realize on‑site coarse crushing to cut ore transportation cost.
  2. Wear‑resistant parts Iron ore causes fast liner wear. High manganese steel jaw plates, cheek plates and toggle plates are mandatory. Regular thickness inspection and timely replacement guarantee throughput and product particle stability.
  3. Feeding control Avoid uneven feeding and material stacking on one side of crushing chamber. Do not feed iron ore mixed with excessive sticky mud, which easily leads to cavity blockage and capacity drop.

Process advantages

  • Strong crushing force adapts well to high‑hardness iron ore; stable heavy‑duty performance for 24‑hour continuous mine operation.
  • Large feed opening can accept big blasted ore blocks, lower requirements for blasting fragment size.
  • Simple structure, convenient on‑site maintenance in remote mining area.

Process limitations

  • Jaw crusher only completes coarse crushing; cannot produce final fine ore. Secondary cone crusher and grinding mill are indispensable for follow‑up magnetic separation.
  • Flaky particles exist in discharge products. Too much sticky wet ore will seriously reduce processing capacity.

Operation precautions

  • Strictly prevent unbreakable metal pieces entering crushing chamber to avoid machine damage.
  • Monitor motor current; long‑term over‑current indicates abnormal feeding or liner severe wear.
  • Check toggle plate and tension spring regularly, guarantee stable jaw movement.