Copper Mine Transfer Chute Polyurea Wear Lining · Antofagasta

What Pioneer Delivered

Not just a machine — a matched system, a trained crew on site, and after-sales backing end to end.

• On-site substrate survey with dew-point and steel-temperature monitoring before any spray — so the lining bonds, not blisters.
• A single-source system — JYYJ-H-V8T machine and pure polyurea material matched, tuned and warranted together, not sourced from three suppliers who blame each other.
• A spray crew trained for confined-space chute and hopper geometry and cold night-shift application — the hard part of polyurea is the operator, and we own it.
• Holiday-tested QA and a return-to-service plan built around the mine's scheduled shutdown — the chute went back to ore flow in under 24 hours, not days.
• Ongoing remote support for ratio and temperature tuning, plus re-order of the exact matched material — so the next wear cycle is a phone call, not a new project.

Execution Process

1. 1 · Surface Preparation

   Grit-blast worn chute and hopper interiors to SP 10 near-white metal, stripping scale and worn ridges. A 75-100 µm angular profile is cut into the steel for a strong mechanical key.

2. 2 · Epoxy Tie Coat & Masking

   Flanges and bolt lines are masked, then a polyurea-compatible epoxy primer is applied inside the recoat window for chemical adhesion. Dew point and substrate temperature are logged before spraying the cold night shift.

3. 3 · Polyurea Spray Application

   Hand-spray 6 mm of pure polyurea with the JYYJ-H-V8T at 36 MPa, heated hoses giving a few-second gel for vertical and overhead surfaces. The monolithic film bridges weld seams and corners where bolt-on AR plate previously left gaps.

4. 4 · Cure & Return to Service

   Tack-free within minutes and fully cured in under 24 hours. The lining is holiday-tested for pinholes and thin spots, then the chute is returned to ore flow — no fastener torque-down, no confined-space hot work.