Grizzly And Jaw Feature - AMPCO Minerals

About the Project

AMPCO Minerals designed, supplied, and commissioned a complete, customized crushing circuit for a scheelite mine in the Asia Pacific region. The circuit consists of a primary jaw crusher, a secondary cone crusher, and a tertiary vertical shaft impact crusher (VSI), along with a horizontal screen, a linear screen, a grizzly feeder, pan feeders, and a comprehensive conveyor system.

Equipment Supplied

  • GF4616 Grizzly Feeder
  • PF426 and PF305 Pan Feeders
  • J45 Jaw Crusher
  • C40 Cone Crusher
  • V100 Vertical Shaft Impact Crusher
  • SHSP6202 Horizontal Screen
  • SL2460 Linear Screen
  • Electro Magnets
  • Channel Frame Conveyors, Truss Frame Conveyors, and Radial Stacking Conveyor

We also designed and manufactured the crushing and screening stations, surge bins, and supporting structures to ensure seamless integration and optimal long-term performance.

During the design stage, the Engineering, Procurement, and Construction company used tested ore sample properties in a simulation software package to select equipment specifications, determine power requirements, and establish a plant production capacity.

A Throughput Problem

After commissioning, it was evident that the achievable throughput was limited to around 50% of the desired production capacity. An evaluation of the circuit revealed that the VSI crusher, with a rock-on-rock (ROR) crushing chamber configuration, was limiting the plant’s throughput. This was attributed to variances between the ore sample properties used in the simulation software and those experienced during the initial plant commissioning phase, which also had an increased amount of moisture in the feed material.

Expertise In Action

The local AMPCO Minerals crushing expert was sent to the site to assist with the circuit’s optimization. Although the ROR chamber configuration was operating with excellent wear parts life, it was determined that the plant throughput needed to be increased. After carefully reviewing actual site conditions, a decision was made to change the machines’ configuration from a ROR to a ROS (Rock on Steel) configuration. The ROS chamber was duly installed, and after some fine-tuning of the circuit, the plant was able to reach its desired plant throughput.

Now that the circuit is meeting the throughput projections, further optimization of the VSI is underway. This work will examine extending the life of the wear parts in the VSI by using different materials and varied anvil designs to increase wear part utilization.

Performance Delivered

AMPCO Minerals’ experts optimized the crushing circuit to achieve the target production rate. Our crushing expert provided onsite training and support for the VSI crusher, cone crushers, and other equipment. With local technical support, spare parts, and engineering assistance from AMPCO Minerals, the plant’s maintenance and operations teams are on track to achieve their production goals. This kind of ongoing support is a hallmark of AMPCO’s after-sales services.